城市污染问题英语作文(经典20篇)

Recently, a Chinese student who studied abroad delivered a speech at the

graduate ceremony. Her speech soon became the hot issue, because she criticized

Chinese air pollution, which was a great threat to her health. Though her speech

had exaggerated the problem, it is true that China has faced many pollution

problems. The haze in Beijing is famous around the world, which is the

punishment for human to ruin the environment. It needs time to fix the problem,

but there is no need to deny our country. Even for the developed countries, they

have once faced such problem before. We can do something in the daily life to

protect it, such as do not throw away the rubbish.

living conditions on Guangzhou sport university

Guangzhou sport university was founded in October 1958, it is one of the oldest sports university founded in China.The first time I entered the campus as a freshman, I was deeply attracted by her cultural atmosphere and historical connotation. I enjoy my life here.The accommodation, canteen, library and some other living conditions.

The accommodation service of our university has gained in acceptance increasingly because of its high quality and relatively low expense. But the dorm often without water. I hope that the school can find a solution as soon as possible so that we had on the day of water. Moreover our library contains a large variety of books. In it you will find both literary and scientific and technical and sports books in Chinese and in foreign languages.We often go to look for books which we want to borrow or to read articles which we like to consult.Our library provides all useful reading matter and reference materials according to our needs.Otherwise, canteen service is pretty good. So we need not worry that we would lose our appetite when far away from home. The varieties of the food are so wide that we can enjoy differently delicious dish every day. What’s more, the prices are very reasonable. We are satisfied physically and mentally.

I love Guangzhou sport university, so I love my class, which is just like another home with my fellows owning the same dream.

Air pollution is one of the major problems of the modern world. A great deal of energy is needed to run the factories of modern industrial nations. Automobile, trains, planes and busses need energy, too. Nearly all of this energy is produced by burning fuels. The burning produces wastes, some of which remain in the air, causing air pollution. Scientists are finding ways to stop air pollution especially in big industrial areas and densely-populated cities. They are studying new ways of generating electricity that may be less damaging to the environment. In the meantime, many power plants are being modernized to give off less polluted material. Also, engineers try to design and locate new power plants to do minimum damage to the environment. However, it may be that we still have a long way to go before we have a "clean" world. Nearly all of the countries are trying hard to prevent and control air pollution. There indeed seems to be no end to tasks that environmentalists will be required to do. People will continually find new ways to control pollution.

with the improvement of our living standard, more and more people can afford a car. as a result, our roads are more often than not crammed with cars. however, with more and more waste gas being discharged by the cars, the problem of air pollution becomes even more serious. so nowadays we advocate to lead a low-carbon life.

my suggestion is we should ride bikes more often instead of driving cars.by riding a bike, we can not only exercise our body but also protect our environment. why not have a try, my dear friends?

与我们的生活水平的提高,越来越多的人都买得起汽车的.因此,道路往往没有堆满了汽车.然而,随着越来越多的废气排放是汽车、空气污染问题变得更加严重.所以现在我们提倡过低碳的生活.

我的建议是我们应该更经常骑自行车而不是开车骑一辆自行车,我们不仅能锻炼身体,也能保护我们的环境.为什么不试试,我亲爱的朋友?

Green, tree and grass planting. Growing these plants containing chlorophyll, is of great help to improve air quality.

First of all, the green plants can be in the sun for photosynthesis, absorb carbon dioxide and release oxygen. Studies show that plant growth and each 1 ton, can produce 5 tons of oxygen. Per hectare woods can absorb one ton of carbon dioxide every day, 0.735 tons of oxygen; The grass can absorb every day 0.9 tonnes of carbon dioxide per hectare, produce 0.6 tons of oxygen. Adequate and clean oxygen can keep human body and mind health.

Second, trees on earth every day can send out 170 million tons of terpenes substances into the atmosphere, the aromatic substance has incomparable sterilization ability and excitation.

Then, the green is good for the dust in the air, dust filtration and absorption, and dust into the air dispersion can stop work. According to the determination, the atmosphere through the forest, can reduce dust amount 32% - 32%, fly ash quantity reduced by 30%.

Do you know? The negative oxygen ion in forest can reach 10-1 million. Negative oxygen ion can adjust the excitement and inhibition of the nervous system, improve the function of the cerebral cortex. Medical experts to simulate forest magic effect, negative oxygen ion into ward. The results found that when the environment is negative oxygen ions and the proportion of oxygen ions control at 9:1, for asthma, burns, ulcers, the treatment of trauma patients can promote role

In addition, greening and absorb the noise, reduce water loss and soil erosion, etc. Your a power to go into our countrys green enterprise, the green idea slowly tell it to you will reap the benefits.

绿化，乃植树种草也。种植这些含有叶绿素的植物，对改善空气质量有很大的帮助。

首先，绿色植物可以在阳光下进行光合作用，吸收二氧化碳，释放氧气。研究表明，植物每生长1吨，可以产生5吨氧。每公顷树林每天可以吸收1吨二氧化碳，产生0.735吨氧气;每公顷草地每天能吸收0.9吨二氧化碳，产生0.6吨氧气。充足而洁净的氧气能让人类身心保持健康。

其次，地球上的树林每天可向大气中散发1.7亿吨萜烯物质，这种芳香物质具有无可比拟的杀菌能力和兴奋作用。

然后，绿色植物对空气中的灰尘、粉尘有良好的过滤和吸收作用，并能阻挡工作粉尘向空气弥散。据测定，大气通过林带，可使粉尘量减少32%-52%，飘尘量减少30%。

你知道吗?森林中的负氧离子可达到10-100万个。负氧离子能调节神经系统的兴奋和抑制状态，改善大脑皮层的功能。医学专家模拟森林的神奇作用，把负氧离子引进病房。结果发现，当环境中负氧离子与正氧离子的比例控制在9：1时，对气喘、烧伤、溃疡、外伤病人的治疗可起促进作用

除此之外，绿化还有吸收噪音、减少水土流失等功能。把你的一份力量投入到我国的绿化事业中去吧，那一抹绿意会向你慢慢诉说它的好处。

As in modern times of birth control being the basic policy of China,core families made of 3 people in which the parents were born after 1980 have a heavy burden of lives.That is to say,they have parents,father-in-law and mother-in-law,grand parents to care and a child to bring up which means two ones have to care 6 olders and bring up one child.It is such a big burden for a family two of whom are workers, when they have to pay for the housing loan , work and care for the olders.Especilly for those who get married not long ,whose olders coming from countries and having no insurance, the burden is more heavy.

In the tranditional culture of China, married conditions of men are different from women.Generally,men should collect enough money and give a wedding feast.This has accomplished an actuality ,if you have a girl baby,you just have to bring her up,and if you have a boy baby,you have to prepare rather many lots of money which you will have earned all your life to pay for your son’ house and his wedding,besides bringing him up.A jok has described the state lively , your boy baby is called a bank of economic construction you have to construct,while your girl baby is called China Merchants Bank on which you needn’t care too much ,and then someone will invest.As a result ,even if it is allowed to have a second child,families who have had a son would not be willing to have a second one.

Most ones born in 1980s(80s) are singletons which generation had received so much hope and love from their parents.Many coming from rich family are poor in living themselves,and not ready to bear hardships,so that pregnant women in them prefer caesarean birth when they deliver,so as to advoid the serious pain,although it had been proved better in science to bear naturally.The 80s parents even don’t want to pay their attention to the babies who will be taking care of by their grandparents.These mathers don’t want to suffer the pregnant process ,and will be still at the front of the pain,even if they woule like to have second ones.

For the young couples whose ideas are traditional,being like to own a big family,they do like have a second baby,but they can only hang back under the pressure of the cruel reality .For the nation,if it demand contradictions between ageing and low fertility relieved,it should entirely relieve the control of having a second single baby,which will rise the ratio of population steadily.The more important is to have most people share the gain of Reform and Openness,to solve the problem of housing loan of people,turning the commercial residential building into welfare building,to improve and perfect the service system of the society,to improve the medical security ,to narrow the gap between the wealthy and poor,to raise the pay of people.Then, the government needn’t to encourage people to do anything,and they would to have more babies all themselves.

For individual ,if you want a second baby and you are rich ,while your parents have old-age pension and could help bring up baby for you,you may as well have another one.

But if you are in pressure of living,while you parents have no retired pension and are in poor health,you’d better concentrate all your energies on your only baby ,and pay no attention to matter of the second baby ,in which it is the best choice for either you or your baby.

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Almost every country in the world faced the population problem.China has the largest population, so the one-child policy was necessay. In America, there were 2 billion people 20 years ago, now there were 3 billion. Some day they will have the same amount people as we had in china, will they apply our population control policyAnyway we could be sure they will not critize our population policy at that time.

​导语：现阶段环境污染愈加严重，下面是yuwenmi小编为大家整理的优秀英语作文，欢迎阅读与借鉴，谢谢!

THE citys meteorological observatory issued a white warning sign Thursday indicating the citys weather could be influenced by a tropical sand storm in the next two days.

The meteorological observatory in Beijing said the storm could hit the city.

"Coastal areas in eastern Beijing could have winds as strong as force 8," the observatory said.

The air quality will become rather terrible with the sand storm.

The wind and sand will cause the city pulluted.

Terrible sand storm!

【参考译文】

星期四，该市气象台发布了一个白色预警信号，表明该城市的天气可能在未来两天受到热带沙尘暴的影响。

北京气象台说，风暴可能袭击该市。

天文台说：“北京东部沿海地区的风力可能比8级强。”。

沙尘暴将使空气质量变得相当糟糕。

风和沙将导致城市污染。

可怕的沙尘暴!

How to save environment? I think we should do the followings: First, it’s best to ride a bike to school, don’t take a bus or a taxi. Second, I will remember to turn off the lights when I leave the classroom.

Third, in my free time, I will collect the empty bottles and waste paper for recycling. The fourth idea is turning off the shower when I ‘m not using it. Fifth, it is imporment to save water and money.

Also, I won’t spend too much money on expensive things. Last, we had better not cut down the trees, we have to take care of the trees . I’ll try my best to save the energy, I hope I can do something for our country.

北京大学社会人口学教授李建新表示,现在的年轻人,尤其是城市长大的年轻人,不大可能不考虑这一决定所要面临的经济挑战而冒然决定要二胎.

Li Jianxin, a professor of social demography at Peking University, says that the younger generation, especially those living in cities, are unlikely to have more children without first considering the economic challenges that decision might bring.

“80后一代人的生活方式和观点与50后、60后有着明显的不同,”李教授说,“多数人不想要那么多孩子,孩子的健康更重要.”

The lifestyle and viewpoints of the post-80s generation are totally different from the 50s and 60s generations, Li said. "Many Chinese want to give birth to fewer but healthier children."

25岁的上海摄影师原田只有1个1岁大的女儿.考虑到抚养1个孩子的成本以及生孩子对自己事业发展所造成的挑战,她觉得1个孩子就足够了.

Yuan Tian, a 25-year-old photographer in Shanghai, has a 1-year-old daughter. And one, she says, is enough – due both to the cost of raising a child and to the challenges a child poses to developing a career.

“生孩子对我的事业影响很大,”她说,“重新回到岗位后,我要花几个月的时间才能赶上同事的步伐.而且也不能把全部精力都集中在工作上,我不得不早点离开办公室去照顾女儿.”

Giving birth really affected my career, she said. "When I returned to work, it took me several months to catch up with my colleagues again. And I cant focus on my work, since I need to leave the office early to take care of my daughter."

Living in a city has both advantages and disadvantages. It is often easier to find work. There are always many choices of public transport. Besides, there are a lot of interesting things to do and places to see. You can eat in good restaurants, visit museums, go to cinemas and go to parks whenever you want to relax. However, living in a city is often very expensive. You must find a well-paid job, otherwise, you will not be able to afford the things you will do. Whats more, the city is always crowded, noisy and dirty. It is very difficult to find a good place where people can enjoy peace and fresh air as in the countryside.

More than half of Beijings adult single children dont intend to have two kids, even though national policy allows them to do so.

The countrys family planning policy of the late 1970s restricted urban families from having more than one child to control population growth.

However, a new survey by the Beijing Administrative Institute shows 52 percent of those now-grown-up single children, who are allowed two offspring, do not want a second child.

Many cited economic pressures as a factor.

The results were released on Sunday at the Beijing Forum, organized by Peking University.

Beijing has roughly 2 million only-child adults.

More than 1,100 people from only-child families, aging 20 to 34, were polled.

Only 24 percent of respondents said they would like to have two children.

More than a quarter of respondents would opt for a "DINK" (double income, no kids) lifestyle.

Survey figures showed that respondents with a primary education wanted 1.1 children on average, those with a bachelor degree wanted 1.3, and those with masters or higher degrees wanted 1.5 children.

"Beijing has maintained a super low birth rate - less than 1.3 children in a family in average - for nearly 20 years, posing increasing pressure on the countrys aging population," Hou Yafei, a professor with the institute, said.

Hou said that the top four factors that determined peoples intentions to have children were "income, child care, housing and policy conditions".

"The government should encourage couples from one-child families to have a second child and should provide better welfare services."

This would promote population sustainability, Hou said.

The survey also found that people with higher education backgrounds intend to have more children because they are more confident with their financial security.

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[考查要点]

考生应根据提示信息（中/英文）写出一篇150－200词的短文。提示信息的形式有主题句、写作提纲、规定情景、图、表等。写作时间约为35分钟。

人口快速增长带来的问题（图表作文强化练习）

[题目要求]

Directions: Study the following graphs carefully and write an essay in at least 150 words. Your essay should cover these points;

1. effect of the country’s growing human population in its wildlife

2. possible reasons for the effect

3. your suggestion for wildlife protection (15 points)

【参考范文】 the ups and downs of population growth

As is seen from the two graphs, it is clear that with the rapid growth of U.S. population from 1800 to 1990, the number of its wildlife species no longer existing soared during the same period. Naturally, we can draw the conclusion that the sharp decline of wildlife species resulted from the population growth.

Two reasons may account for this phenomenon. To begin with, as the population grows, people consume much more natural resources, which often leads to excessive hunting. Second, with the increase of human activities, modern people take up more and more space. Which has a great impact on other species. Finally, the problem of pollution becomes more and more serious with the development of modern industry. More and more animals have to adapt themselves to the decaying environment or move to a totally different place, but not all of them are fortunate enough to survive the changes.

Solving this problem calls for, above all, the government’s efforts to control population growth, to decrease industrial pollution and to enhance the laws to forbid wildlife hunting. Moreover, common citizens should be aware of this ecological crisis and take on the responsibility of wildlife protection. In a word, only when the government and the common people make joint e f forts can we hope to find a satisfactory solution to this problem

Write a passage with the words and phrases given：the problem of pollution， cause， artificial substances， release， waste products， industrial production， consumption of goods， bring it under control， agriculture， chemical substancea. Environmental Pollution I read a piece of news recently. It says that in Japan marly businessmen ave selling fresh air to customers.and now it is becoming more and more popular. Why？ ——Fresh air is getting less and less in Japan， and so is it in the U. S. A. In fact， environmental pollution is a very serious problem the whole world is facing. it is mainly caused by the waste products released from artificial substances， industrial production and increased consumption of goods. Bedsides， the use of chemical substances in agriculture also causes environmental pollution. Look at the sky， you can see that dense smoke is being released from the high and big chimneys；

those dirty and poisonous substances are flowing into the rivers that we use for drinking water and millions of tons f waste products are heaping around us. How to change this condition？ More and more countries are trying to work out some effective means to bring it under control， but no great success has been made.

It is very important to deal with the rubbish in cities. Rubbish must be thrown away or reused properly. Or it may cause a lot of problems. It may pollute the air and water. People may get ill when they breathe the polluted air or drink the polluted water.

Our city has started to face the problem. Some rubbish is sorted and sent to a certain place .Waste gas is cleaned before it goes into the air. Waste water is also cleaned before it is poured into rivers.

People should be prevented from throwing rubbish everywhere. We should try our best to take care of our environment and fight against pollution六年级英语环保作文：Saving Our City.

The proposal is from Wang Yuqing, a deputy director of the Committee of Population, Resources and Environment.

He is being quoted as saying he favors a gradual opening of a two-child per family policy, and says he believes the current limitations will be lifted by the end of the five-year plan in 2015.

The current family planning policy was initiated in 1979 to control Chinas rapidly growing population.

But some negative side effects have emerged, including a rapidly aging population.

Peng Xizhe is the Director of the Institute of Population Research at Fudan University.

"The one-child policy has fulfilled the goal initially set. Negative effects will pile up if it continues."

The President of Renmin University, Ji Baocheng, claims the labor force population between the ages of 28 and 40 will be halved in 10 years.

As an example, in Shanghai, which has the highest urban population in China, the number of Shanghai natives -- as in those with a Hukou -- has actually been dropping for the last 17 years in a row, even though the citys population has been increasing.

A possible reason for Shanghai parents not choosing to have a second child could be the rising cost of everyday expenses, particularly the cost of education.

"I dont think Ill have a second child if the limit is removed. Im simply a wage-earner, and I find it difficult enough to raise one child, so I wont consider the second."

But at the same time, there are still people who think it would be nice to have two children.

"I will think about it. A lot of parents now are the only child in families, to have two kids means they can look after each other in the future, and of course, therell be financial burden."

One-Child Policy has been relaxed in certain ways over the years.

In cities such as Shanghai and Beijing, if a couple is both the product of the one-child policy, theyre allowed to have two kids.

Certian ethnic minority groups have been exempt from the rules entirely.

And families in rural areas whose first child is a girl are also allowed to have a second child without punishment.

It remains unclear as to how the proposed two-child policy will work, though its being suggested that several big cities will be selected to try it before its brought in around the country.

For CRI, Im Wang Jing.

What I expect for city life is not just about drink bars, shopping mall, entertainment center etc, although they are indeed better than the facility in the rural areas. What I expect for city life is a clearer environment, not only in the surroundings but also in peoples spirit. I hope the people around me are all good mannered with politeness and courtesy, there is no quarrel, no battle, people treat each other with respect. I hope there would be no traffic jam as in Beijing our country capital today where traffic jam happened everyday, which make the citizens feel depressed and great pressure.

当今社会正以迅猛之势飞速发展，归根到底是高新技术产业的进一步深化。不容乐观的就是环境与发展之间的问题还没有得到彻底根除。而下面便是小编整理的关于环境问题英语作文 。

环境问题 英语作文【1】

There are still many problems of environmental protection in recent years.

One of the most serious problems is the serious pollution of air, water and soil.

the polluted air does great harm to people’s health.

The polluted water causes diseases and death.

What is more, vegetation had been greatly reduced with the rapid growth of modern cities.

To protect the environment, governments of many countries have done a lot.

Legislative steps have been introduced to control air pollution, to protect the forest and sea resources and to stop any environmental pollution.

Therefore, governments are playing the most important role in the environmental protection today.

In my opinion, to protect environment, the government must take even more concrete measures.

First, it should let people fully realize the importance of environmental protection through education.

Second, much more efforts should be made to put the population planning policy into practice, because more people means more people means more pollution.

Finally, those who destroy the environment intentionally should be severely punished.

We should let them know that destroying environment means destroying mankind themselves.

环境问题 英语作文【2】

With the improvement of our living standard, more and more people can afford a car.

As a result, our roads are more often than not crammed with cars.

However, with more and more waste gas being discharged by the cars, the problem of air pollution becomes even more serious.

So nowadays we advocate to lead a low-carbon life.

My suggestion is we should ride bikes more often instead of driving cars.

By riding a bike, we can not only exercise our body but also protect our environment.

Why not have a try, my dear friends?

环境问题 英语作文【3】

Recently,fog and haze has become a imminent threat which most northerners in China are facing.

While the cities of China have greeted striking speed of development with open arms,they suffer greatly from a persistent and dense haze of pollution and smog.

It is high time that we took some methods to protect the environment and ourselves.

Generally speaking,there are three effective ways.

First of all,the government should take into serious consideration the emergency and severity of the air pollution,and take measure to deal with it.

Such as more public transportation systems should be put in use,more energy-saving resources should be utilized.

What’s more,every little effort from individuals counts.

The citizens should contribute to the reduction of pollution by driving less.

Last but not least,try to reduce the time of outdoor activities,especially when the air quality is not good enough.

From what has been mentioned above, to protect our air,we must keep in mind that whatever we give out,we take back in the long run.

So we have to drive less,pollute less and make more changes.

[环境问题 英语作文

导语：越来越多汽车进入我们的家庭生活，改善了我们的生活，但同时也带来了很多问题，如塞车和车祸，给家庭和社会带来极大的危害。下面是yuwenmi小编为大家整理的英语作文，欢迎阅读与借鉴，谢谢!

请写一篇有关交通安全的短文(80字左右)

内容包含：

(1)遵守交通规则，如走人行道/过斑马线。

(2)别在街道上或马路上玩耍和踢球。

(3)劝父母不能酒后驾车。

你可以适当增加内容，让短文通顺，过渡自然。

参考词汇：sidewalk 人行道、zebra-crossing 斑马线

注：第一段已给出，不计入总数

关于交通问题的中考英语作文

With more and more cars coming into our families, we are happy that it has greatly improved our life. But unluckily, it has also brought many problems, such as heavy traffic and traffic accidents.

Traffic safety is everybodys business. We must obey the rules. For example, we must walk on walk side, when we cross zebra – crossing, stop and look right and left, then go across fast. Dont play football on the road .we can tell our parents not to drink before they drive, not to run through red lights, not to talk and laugh while driving etc.

We can say cars are coming into our life, but only when everybody thinks traffic safety is everybodys business can we be safe driving on roads and walking on sidewalks.

【参考译文】

随着越来越多的汽车走进我们的家庭，我们很高兴它大大改善了我们的生活。但不幸的是，它也带来了许多问题，如交通拥挤和交通事故。

交通安全人人有责。我们必须遵守规定!例如，我们必须走在一边，当我们过斑马线，停下来，看左，右，然后跨越快速。不要在马路上踢足球，我们可以告诉父母开车前不要喝酒，不要闯红灯，开车时不要说话和笑。

我们可以说汽车正在进入我们的生活，但只有当每个人都认为交通安全是每个人的业务，我们可以安全驾驶道路和人行道上行走。

近年来，中小学生健康问题日益引起人们的关注。请你用英语就该问题谈谈你的看法。

要求：(1)内容包括①列举中小学生面临的健康问题。

② 请谈谈怎样才能保持健康。

(2)字数：60---80词。

(3)短文中不得出现你的真实姓名、学校名和地名。

范文：Every one wants to keep healthy today, especailly our students. But we dont pay attention to our health. Some of them go to school without breakfast in the morning. Some students and pupils play computer games or watch TV all day, espacially at the weekends. Many boys think it is cool to drink or smoke.

It is important for us to have good habbits. We should eat breakfast every morning. We can watch TV or play games for a short time, then have a rest. We also can take part in some clubs. I think it is necessary for us to keep healthy.

我国的城市河流和湖泊污染情况是非常严重的,城市河流水有不同程度的富营养化问题。以下是小编给大家整理的形势与政策论文：城市水环境的问题探讨的内容，欢迎大家查看。

摘要: 随着经济快速发展，城市生态形势压力也与日俱增，水环境问题已成为制约社会发展的大问题，环保基础设施建设严重落后，城市生活污染物未得到有效控制，工业污染源未得到严格治理，农业污染日益突出，部分河段水质受污染严重，河水发黑发臭，完全失去水质功能。本文主要对城市水环境治理及污染防治对策进行了分析探讨。

关键词：城市规划;水环境质量;污染防治;对策

城市生态环境是城市宜居水平评价和城市经济发展的重要因素。作为城市生态环境的重要组成部分，城市水环境对生态环境的治理和改善有着重要的影响。受传统经济发展理念的影响，我国城市水环境污染情况不容乐观。而且在城市扩建过程中还造成了大量周边湿地的消失，造成了城市生态环境、水环境的进一步恶化。针对这样的情况，我国近年来加大了城市生态环境治理力度。从城市规划与发展的角度出发，恢复城市周边湿地环境、改善城市水环境与生态环境。

一、城市水环境的基本特点

1、城市用水的特点

生活用水和生产用水是城市用水的主要类型，由于城市人员密集、工业化生产程度高，所以，城市用水需要较高的质量、较大的供水量、稳定的供给，这对城市采水、供水和用水来说有着不同于农村的特点。

2、城市用水的依赖性强

城市由于用水量大、供水要求高，所以，单纯依靠城市区域的供给和开采往往难于满足城市发展的需要，因此，大众城市往往需要从城区周边或外地调水来满足城市的用水需要，“引滦入津”、“南水北调”就是这样的举措。

3、城市水环境脆弱

在我国北方，城市生活和生产用水大都在简单处理或未经处理就直接排放到环境之中，在日积月累的大量污染的影响下，城市水环境受到了严重破坏，并且这一现象有蔓延和恶化的趋势，造成水环境的脆弱和生态的破坏，影响城市深入地发展。

4、城市地下水环境恶化

城市地下水环境恶化来源有两个，一是，城市生产和生活中大量污染源渗入地下，造成对地下水资源和水环境的破坏;二是，城市地表硬化导致城市地面下渗量的减少，在大量开采地下水的同时，没有必要的补充，出现水环境的恶化。

二、城市水环境综合治理方法

1、以人为本，科学发展

把维护广大人民群众的根本利益作为第一点，把群众最关心、最直接和现实的水环境保护问题为重点，转变发展观念，重视生态文明建设，加快建设资源节约和环境友好社会，走科学发展道路。

2、优先保护饮用水源

合格的安全饮用水源是人民生活的必需品，水环境治理应突出重点，优先保护饮用水源，确保群众饮水安全。

3、强化节能减排、效益原则

与区县减排工作挂钩，把COD削减量考核指标纳入到区县水环境治理目标体系中，明确各区县污水处理率、污水处理厂运行负荷率等量化指标。切实保障三个达标，即污水处理率必须达标、污水处理厂的运行负荷率必须达标、COD的减排必须达标。合理安排资金，对节能减排效果明显，有一定经济基础，技术条件成熟，符合国家和行业产业政策的项目优先考虑。

4、治本方针

突出截污治污。河道沿线村镇、企业密集，污染来源复杂。为此，河道治理将坚持“先截污、后清淤、先治理、后换水”的原则，周密排查河道沿线污染来源，大力实施清淤、截污、生态护坡、河岸绿化等措施，加强河道水体自净和生态修复功能;在突出截污治理的同时，各区县还将坚持污水处理厂、配套管网同步建设，大力提升现有污水处理厂运行负荷率，妥善解决污水出路，切实提高河道水环境质量。

5、加强协作，落实责任

市水务局于去年成立了河道水环境考核办公室，将清水工程已治理河道纳入考核范围，各区县按照属地管理原则在本辖区内建立水环境管理机构和相关管理机制，有效巩固水环境治理成果。此外，目前市政府已正式批准本市河道水环境实施“河长制”管理意见，即将公布全市主要河道“河长”名单，构建完善的河道水环境管理长效机制，为今后本市水环境由加强治理向强化管理转变打好基础。

三、城市河流水防治和改善技术的应用

1、底泥疏浚和河床微生态系统修复

在河流洪水、蓄洪功能上,底泥疏浚主要体现在河流利用水面变化增加行洪、蓄洪能力。作为沉积物沉积,有的湖泊水的深度可以被调整,从而减少其调节和存储功能。增加城市河湖疏浚河道水容量后,以确保顺利排出这些河流洪水,保障人民群众的生命和财产安全,也避免了洪涝灾害。底泥疏浚是水环境综合整治的一项重要措施,滇池、巢湖、太湖等水环境综合整治已被广泛使用。可见,合理的疏浚清除污染物,对于生态系统的恢复和重建具有非常重要的作用。

2、人工增氧技术

人工增氧技术是基于城市河流水污染后缺氧的现象,人工的向水体中注入空气或氧气,从而加速水体复氧的进程,提高水体的溶解氧水平,恢复和提高在水中好氧微生物的活力,使河流水的污染物净化,从而改善河流的水质。河流氧气一般使用固定和移动站充氧平台两种形式。河道人工增氧技术的应用,能够使得水质不同时期达到消除黑臭、减少水体污染负荷、促进河流生态系统恢复的目的。

3、调水引流水质改善技术

贯穿城市的内河河网水系,因为控制结构的限制,使得河流水不能够连接到外部的水体,造成水处于静止的状态,当天气炎热的时候,溶解在水中的氧气浓度就会降低,容易导致水质变坏。通过改进水域水动力条件,提高水体污染物的稀释能力,增强局部水体的自净能力,许多城市在水资源利用和部署中,通过跨流域调水工程,解决空间分布不均的问题。

4、植物修复技术

对于河道河流自然恢复应采取生态化措施,主要是通过恢复河岸植被、恢复天然湿地,在河岸种植芦苇、浮萍、睡莲、水生植物和其他湿地植物,以提高水体的净化能力。种植水生植物的城市河流水,一方面能够通过植物的根系的吸收,从而降低和遏制富营养化趋势;另一方面通过种植水生植物,可以也起到美化水体环境,提高城市的景观的效果。

5、生物净化技术

生物净化技术是充分利用天然水体自净的功能,采用人工措施,创造更有利的环境有利于微生物的生长和繁殖,并培养出大量的微生物从而增强水体净化能力,以提高纳污水体氧化降解有机物能力的一种净化方法。目前国内外最常用的生物净化技术是曝气技术、生物膜技术与投菌技术。生物净化技术,其成本低,对环境的影响小,能够有效降解污染物,是水体污染处理的最佳选择之一。生物净化技术及产品的开发,特别是分解菌株的培养也将被筛选到河流水污染控制技术之中,是未来城市水污染防治和治理的发展趋势。将具有特殊分解能力的菌种添加到河边,能够将水体中有毒有害物质分解为无毒无害的物质,从而加速有毒物质的分解、转化,不仅可以提高河流的净化能力,而且也实现了河流的生态修复。生物产品的运用将成为人工增氧、底泥疏浚等现有防治技术的有益补充。

四、结束语

综上所述，我国的城市河流和湖泊污染情况是非常严重的,城市河流水有不同程度的富营养化问题。目前,在城市河流污染环境下,需要完善城市管线网络,并建设污水处理厂,具体的水污染防治技术措施有:底泥疏浚、人工增加氧气、引水排水水质改善、植物修复、湿地水净化技术等河流强化净化技术。能够应对不同的城市的污水状况,使得城市河流水污染的情况得到了有效的控制,促进城市河流的健康发展。

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