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Ningbo City, Zhejiang Province, is located at the intersection of Yongjiang River, Yaojiang River and Fenghua 0 River and 3L River, but due to water pollution, the most water shortage 2 times need to rely on water transport 6 vehicles n days and 5 nights to run non-stop to transport the water 7 in the river of Township V Village into various S enterprises in the city. The water of Tais Lake 6 is seriously polluted. Only 7 of the 2 bodies of the surface water have reached the standard of 0 on the surface water category 2, while the 6 bodies of the 7 R water have reached the level of eutrophication water 4, and the concentration of the main pollutants shows a certain degree of 6, and the cyanobacteria have erupted from time to time.

2) The water shortage of the whole P basin is severe in 6 qualitative type 2. The deterioration of surface water 3 quality 3 is the direct cause of the large C amount of groundwater 0 C mining, and the ultra-intensive O mining leads to the rapid decline of 7 water levels of groundwater J water and the waste of high-quality groundwater 4 resources. It is planned to build, expand and B is under construction in Tai X Lake, and the annual water intake of Tai X Lake is 7 and P.

Taking into account factors such as future water use 7 to 1 and P ecological water use 5 to expand n, by 2020, the amount of water required by a 4 in the Taim Lake area will increase by at least 5 billion n cubic meters compared with 420006. According to the Taif Lake dispatching and application formula 7, the regulating volume of the Tair Lake is only 80 to 2 billion A square 4. (3) The net enclosure culture and enclosure culture of Taiy Lake have exceeded the carrying capacity of N Taie Lake, which seriously affects the ecological environment of the five local water areas of Taic Lake and destroys the ecological function of the lake.

There were 6 cases in Dongtai E Lake with 4 major E scale concentrated 5 types of net enclosure culture. East Taig Lake is the main channel for the downward discharge of flood water from Tais Lake and the water supply to the upper L Sea1, and the amount of water discharged through East Tai X Lake1 accounts for about 70 -30 of the total amount of water discharged from Tai B Lake6. Due to the shallowness of Lake X, the clear water of 0, the wind and waves of 7 and the small amplitude of the water 4 bits, the East Taiw Lake has become the main area of 6 purse seine breeding of large U hairy crabs.

Net enclosure culture needs to put a large amount of bait, and the residual bait sinks to the bottom of the lake, which becomes a fertilizer for the growth of 8 harmful algae in 3 water 5 3, which makes the eutrophication of water 3 quality 7 more serious. In addition, part of the 2 water 2 grass rot and crab excrement can cause unhealthy effects on water 1 quality. (4) The swampification of the East Tai E Lake 3.

The water of Dongtaiu Lake 1 is shallow, the original sediment is fertile, and the water 5 plants are well developed, which can absorb the nutrients of lake water 0 and 0 in the sediment in 4 large days, and play the role of purifying 0 lake water 7 and preventing 6 eutrophication7. However, due to the fact that the large J part 3 on the 2nd side of the water of the East Taih Lake is 3 net enclosures, the water 8 grasses grow vigorously and 5 vigorously, forming a unique ecosystem of the East Taih Lake. "The lake flow transported a large amount of sediment and nutrient lakes to the east, and the lake basin became shallower, creating q conditions for the growth of 0 water, 0 water, 3 organisms in 6 lakes8.

Net enclosure culture and lush water 4 water 6 organisms reduced the wind, waves, and flow velocity of the East Tai F Lake, created l conditions for the 4 siltation, and accelerated the swamping process of the East Tai T Lake from 7 to 7 and the big F and big B"。"The swamping of a lake 0 is a prelude to the demise of the lake. (5S) The flood control pressure is not aggravated.

The ground subsidence makes the height of the embankment of the flood control embankment relatively low, and the flood control standard is reduced from 0.

Certain harmful substances (e.g., pesticides, fertilizer use; industrial wastewater; domestic sewage; Hospital sewage, etc.) enters the water body, exceeding its self-purification capacity, causing physical and chemical changes in the natural water body.

It is mainly due to the excessive number of two elements, N and P, which causes eutrophication of the water body.

Industrial pollution, needless to say.

It's serious, it's serious, it's serious, it's serious, it's serious, it's serious.

Answer: At present, the water quality of Taihu Lake is seriously polluted, which is mainly manifested in eutrophication, cyanobacteria outbreak and bloom formation.

Explanation: Taihu Lake is the third largest freshwater lake in China and an important part of the Yangtze River Economic Belt. However, due to long-term human activities and pollution discharge, the water quality of Taihu Lake has been severely damaged.

Eutrophication is one of the main manifestations of water pollution in Taihu Lake, which is mainly due to excessive nutrients entering the lake, resulting in the overgrowth of algae and other eutrophic organisms in the water, thus affecting the water quality. In addition, problems such as cyanobacteria outbreaks and bloom formation in Yuzhou often occur in the waters of Taihu Lake, which pose a serious threat to the local ecological environment and water resources.

Expansion: In order to control the water pollution of Taihu Lake, ** and relevant departments have taken a series of measures, including strengthening water pollution control, strengthening environmental protection publicity and education, and strengthening monitoring and evaluation. The water quality of Taihu Lake has improved in recent years, but sustained efforts are still needed to achieve better water quality goals.

In addition, the water pollution problem of Taihu Lake also reminds us that protecting the environment and building an ecological civilization is everyone's responsibility, and the whole society needs to work together.

1. Chemical industry, textile printing and dyeing, ferrous metallurgy are key polluting industries, in the process of cage farming, only a small part of the fertilizer, medicine, livestock and poultry manure, and aquatic bait put into Taihu Lake are used by fish, and the rest of the aquaculture, straw, and village domestic sewage sink to the bottom of the lake, polluting water quality.

2. With the acceleration of industrialization and urbanization in the Taihu Lake Basin, the population in the region has increased dramatically, and the amount of domestic sewage produced has increased rapidly compared with before. In addition, the laying of sewage pipes is not sound, and the treatment cannot keep up with the pace of urbanization, resulting in the sewage being discharged into Taihu Lake without treatment or only after simple treatment.

3. There are many fishing vessels in the waters of Taihu Lake, and most of the current fishing history boats are powered by diesel fuel, which is not fully combusted, and the gaseous particulate pollutants produced fall into Taihu Lake with the wind, polluting the water body.