Yangdahe is an important river flowing through Lunjiao in Shunde, which flows through Lunjiao Street Center, Licun, Xiyong, Shixia and Sanzhou, mainly providing industrial and agricultural water for the above areas. In recent years, with the development of Shunde's economy and the gradual improvement of people's living standards, foreign rivers are inevitably polluted by various untreated sewage, which has caused adverse effects on people's production and life.
Sampling point pH, water temperature (℃), visibility (m), floating objects
Entertainment center 6. 1.23.2 turbidity, 0. 1.5 oil layer, all kinds of garbage.
Ailianqiao 6.3 23. 1 turbid, 0. 16 with a small amount of plastic bags and oil layers.
Xiyongqiao 6.8 23 turbidity, 0.20 water lily, garbage.
The intersection of nepheline is 6.5 22.2 turbidity, with 0. 18 water hyacinth and oil layer.
Analysis:
① The PH value of water samples at the intersection of Leisure Center, Hu Ailian Bridge, Xiyong Bridge and Shi Xia Road is high;
(2) The visibility at four o'clock is low, which is not up to standard, and there are often floating objects, oil stains or plastics on the water surface.
It shows that the river pollution is serious, and the water area of Ailianqiao is the darkest and stinkiest.
Comparing the data provided by the Environmental Protection Bureau, we can find that the data we measured are slightly different, which may be related to the different measuring points and time.
Yang Dahe collects industrial wastewater, agricultural wastewater and domestic wastewater from the centers of Sanzhou, Shi Xia, Xiyong, Licun and Lunjiao Street. Due to the rapid development of Lunjiao in recent years, industrial areas and commercial buildings have mushroomed along the Yang Da River. Therefore, the waste water and sewage discharged into Yangdahe gradually increased, so that Yangdahe was no longer crystal clear. In other words, Yang Dahe gradually lost its original value and function, and the water body was polluted. According to the monitoring, the main water pollutants in Yangdahe River are as follows:
1, industrial pollution:
Due to the poor supervision of relevant government departments, some enterprises' sewage discharge equipment is aging, and it is difficult to meet the sewage discharge standards. Such factories include Weili woodworking machinery factory, glass factory, automobile repair shop and electroplating factory. Pollution in some industries is very serious. There is no sewage treatment plant in Lunjiao area for the time being, so it is impossible to treat the sewage in time and effectively. Some even discharge directly to the nearby Yangdahe River through small rivers and tributaries. Industrial pollutants mainly include (1) oil pollution: oil pollution is not only harmful to the utilization of water, but also affects the oxidation into the water after forming an oil film on the water surface. Oil also easily fills fish gills, making it difficult for fish to breathe, and even causing fish to suffocate. (2) Mercury pollution: Yangdahe water is also polluted by mercury, which mainly comes from pesticide production and the use of mercury-containing pesticides. (3) Chromium pollution. Due to the limitation of experimental instruments and other conditions, our group can not accurately determine the contents of mercury and chromium in Yangdahe water. According to the data provided by the Environmental Protection Office, the content of mercury and chromium in Yangdahe water is low, and the Group has doubts about the authenticity and accuracy of the data provided by the Environmental Protection Office.
2. Pollution of catering industry
Along the banks of Yangdahe, there are more than a dozen restaurants. Walking along the Yangdahe River, you can often see scraps of paper, colorful plastic bags and fast food lunch boxes floating on the river. In restaurants by the river, they often pour sewage and even guests' leftovers into the river. In this way, our sheep river was trampled again and again.
3. Domestic sewage pollution
Strolling along the Yangdahe River, we can see that the sewage outlets on both sides of the river are constantly discharging untreated domestic sewage into the river. We counted the sewage outlets all the way, with more than 40 large and small. Because the sewage discharged by households is mainly all kinds of washing water in people's daily life, which contains a lot of detergents, and the detergents all contain phosphate purifying agents, which will lead to eutrophication and deterioration of water bodies.
In order to know the situation of domestic sewage discharge and detergent use, we designed a family questionnaire, and selected 50 students from Grade Two/KLOC-0 and their parents to conduct a questionnaire survey. We sorted out, counted and analyzed every item of data in the questionnaire.
(1) The monthly per capita water consumption is 5.5 tons. The population along the Yangdahe River is about 50,000, and it is estimated that the monthly water consumption of residents in the town center is about 275,000 tons. Because the sewage discharge is roughly equal to the water consumption, the sewage discharge is about 275 thousand tons, which shows that Yang Dahe is under great pressure.
⑵ 82.6% of households use phosphorus-containing washing powder to wash clothes.
(3) Most residents have heard of phosphorus-free washing powder, but it is difficult to buy it in the market.
(4) Two-thirds of residents know that using phosphorus-containing washing powder will damage the environment, while using phosphorus-free washing powder will not damage the environment.
5.97% households use detergent, and the average dosage of detergent is 490ml.
From the above data analysis, a large part of the sewage discharged from the sewage outlet is domestic sewage. Because residents use a large number of phosphorus-containing detergents, domestic sewage is rich in P and other substances, resulting in eutrophication, decreased dissolved oxygen and black and smelly water.
4. The "green devil" of water-water hyacinth pollution
Shunde is a part of the land of abundance and a famous water town. The criss-crossing and extending rivers and water networks are distributed in every corner of Shunde. Therefore, water hyacinth can also be seen everywhere.
Water hyacinth was planted as pig feed in 1950s and 1960s, and later spread into wild weeds. Up to now, the situation is almost out of control. Water hyacinths mostly grow in rivers, ponds and canals. Most of the water hyacinths of Lunjiao grow in rivers or ponds. They can often be seen on the Yangdahe River. Most of these water hyacinths come from the tributaries of Yangda River.
In a large farmland about 200 meters in front of the Shi Xia intersection, there is a small tributary with a width of 5 meters connecting the Yangdahe River. If you don't look carefully, you don't know that this is a small river, but you will mistakenly think it is a vegetable. It is also difficult to see the shadow of water on the river bank. These water hyacinths often drift to Yangdahe with the current. Water hyacinth, a "green devil" on the water surface, will isolate sunlight, air and water, making other creatures in the water unable to survive, leading to a large number of anaerobic microorganisms, but beneficial microorganisms will die in large numbers, making the water body black and smelly and polluting the environment. If we don't take measures to prevent the expansion of "green devils" on the water, the consequences will be unimaginable.