2011165438+1On October 20th, we visited Jincheng Sewage Treatment Plant under the guidance of our teacher. After the visit, we were all very moved.

After arriving at the destination, the sewage treatment plant I saw was much better than I expected. The ground is clean and tidy, surrounded by trees and colorful flowers, which is very different from the sewage treatment plant we imagined. Under the guidance of the teacher, we visited the sewage treatment process of the new factory. We saw the process of sewage turning into reclaimed water, and we also knew the role of bacteria in sewage treatment. Let me talk about my experience of visiting a sewage treatment plant.

China is a country with severe drought and water shortage. The total amount of fresh water resources is 2.8 trillion cubic meters, accounting for 6% of the global water resources, ranking fourth in the world, second only to Brazil, Russia and Canada. The average per capita is only 2,200 cubic meters, which is only 1/4 of the world average, while that of the United States is 1/5, ranking 1 in the world and 1 in the world. Mainly reflected in the uneven distribution: China has a monsoon climate, with precipitation concentrated in summer and very dry in winter, especially in the north.

Water is an important part of natural resources and the main material basis of all biological structures and life activities. On a global scale, water is the link connecting all ecosystems. Natural ecosystems can not only control the flow of water, but also continuously promote the purification and circulation of water. Therefore, water in the natural environment is of decisive significance to the survival of living things and human beings. With the growth of population and the continuous development of industrial and agricultural production, the contradiction between supply and demand of water resources is increasing. From the beginning of this century to the mid-1970s, the world's agricultural water consumption increased by 7 times, and the industrial water consumption increased by 2 1 time. China's water consumption has also increased rapidly. By the end of 1970s, the total water consumption in China was 470 billion cubic meters, 4.7 times that in the early days of the People's Republic of China. Among them, urban domestic water consumption increased by 8 times and industrial water consumption (including thermal power) increased by 22 times. At the end of 1970s, Beijing's urban water consumption and industrial water consumption were more than 40 times that of the early days of the People's Republic of China. By the end of 1970s, urban water consumption in Hebei, Henan, Shandong, Anhui and other provinces had increased dozens of times, and some even exceeded 100 times. Therefore, the contradiction between supply and demand of water resources is extremely prominent. Due to the increasingly acute contradiction between supply and demand of water resources, it has produced many adverse effects. First of all, it has a great impact on industrial and agricultural production. For example, 198 1 year, Dalian lost 600 million yuan of industrial output value due to water shortage.

Among the 654.38+0.5 billion mu of cultivated land in China, there are still 830 million mu of dry land without irrigation facilities, and another 654.38+0.4 billion mu of water-deficient grassland. Every year, 300 million mu of farmland in China suffers from drought. There are still 40 million people and 30 million livestock in the northwest agricultural and pastoral areas with difficulty in drinking water. Secondly, it brings inconvenience to people's life and work. Water supply for buildings in some cities is insufficient or often cut off. Some water-deficient cities have to take regular water supply rationing, which makes people's lives difficult. Third, over-exploitation of groundwater leads to the continuous decline of groundwater level and the depletion of water resources. In 24 of the 27 major cities, underground water drop funnels have appeared. In recent years, droughts have frequently occurred in the south, such as the worst drought in Yunnan last year in 50 years. It caused crops and livestock to die because of drought in many places. Many places in Kunming also have problems caused by drought. In this case, the recovery and recycling of water resources is very important. Now, Kunming regards building a new sewage treatment plant and improving the utilization rate of water resources as an important link in future environmental development.

So how do we protect water resources?

First of all, we should establish the consciousness of cherishing water and carry out water resources warning education. For a long time, most people generally believe that water is an inexhaustible "cornucopia", which is wasted in use and does not know how to cherish it consciously. In fact, the water resources on the earth are not inexhaustible. Especially in China, the per capita water resources are not rich, the regional distribution is uneven, and the year is unpredictable, with great inter-annual differences. Coupled with serious pollution, water resources are even more scarce, which is vividly reflected in the repeated water cuts of the Yellow River. National water resources utilization projects such as "Yellow River Diversion Project" and "South-to-North Water Transfer Project" are aimed at solving the water shortage problem in some areas, but we should think deeply: Where can we "divert water from the Yellow River" when the water in the Yellow River is exhausted? The water in the south is polluted. How to "transfer water to the north"? Therefore, people must establish the consciousness of water crisis, take saving water resources as our conscious code of conduct, and carry out water resources warning education in various forms.

Secondly, we must develop water resources rationally to avoid the destruction of water resources. Water resources development includes surface water resources development and groundwater resources development. When exploiting groundwater, because the water quality between aquifers is very different, it should be exploited in layers. Contaminated diving and confined water shall not be mixed; For exploration projects that expose and penetrate the water layer, layered water sealing and hole sealing must be carried out in strict accordance with relevant regulations to effectively prevent water pollution and ensure the sustainable development of water bodies. Specific measures are as follows:

Vigorously develop greening, increase forest area and conserve water. Forests can conserve water, reduce ineffective evaporation, regulate microclimate, and have throttling significance. It can increase the precipitation in forest areas and forest edges, which is of open source significance.

In order to improve the comprehensive utilization of water resources, water has the characteristics of comprehensive utilization in the same space. Reservoirs can store floods and cultivate aquatic animals and plants. The large water surface is navigable and some water bodies can also be used for tourism. The water used for hydroelectric power generation can be used for irrigation. The water leaked from canals and fields can be pumped underground, and the water pumped underground can also be pumped downstream of irrigation areas for reuse. Xinjiang is an arid area. Without irrigation, there would be no agriculture. Trying to improve the water diversion rate of rivers and arrange the relationship between upstream and downstream water use is equivalent to opening up water sources.

Water transfer project. Due to geographical and climatic characteristics, the distribution of water in different regions is unbalanced. Using natural factors and artificial transformation to transfer water from water-rich areas to water-deficient areas is an effective means to solve the water shortage problem and open up new economic zones.

Protect water resources. Water resources are polluted, which makes the available water unusable, which is actually equivalent to reducing water resources. At present, 40% of the rivers in the world are polluted to varying degrees, and there is an upward trend.

Urban development and utilization of sewage resources, the development of reclaimed water treatment, sewage reuse technology. After treatment and purification, the high-quality miscellaneous drainage produced by some industrial production and life in the city can reach a certain water quality standard and can be used as non-drinking water for greening and sanitation.

Develop and popularize water-saving appliances. According to incomplete statistics, there are nearly 40 million sets of toilet water tanks and a large number of other sanitary appliances in China, and the water lost every year due to the leakage of toilet water tanks reaches hundreds of millions of cubic meters.

Strengthen the legal construction and publicity work of protecting water resources and saving water, enhance the awareness of saving water of the whole people, make people consciously realize that water is a valuable resource, abandon the outdated concept of "inexhaustible", and a good social fashion of cherishing, saving and protecting water resources has taken shape.

This visit to the sewage treatment plant made me feel the lack of water resources and the importance of protecting water resources. To protect water resources, we must first mobilize the whole society and change the traditional concept of water use. To make everyone realize the preciousness of water, the water used to flush toilets is equivalent to the per capita daily water consumption of some developing countries; Taking a cold bath in summer is equivalent to the daily water consumption of dozens of people in water-deficient countries; If the faucet is not tightened, the water lost in one night is equivalent to the total amount of drinking water in a village in Africa or Asia. This is by no means sensational, but the result of years of investigation by relevant United Nations agencies. Therefore, it is necessary to call on the whole society to save water, use more water and make full use of circulating water.