Study On The Effect Of Effluent Met The Standard From Sewage Treatment Plant On The Receiving Waters And Subsequent Repair Plant

As China's economy and the population rapid increased, the effluent is also increase greatly. In order to curb it ecological and environmental pollution, our country has increased the rate of the city sewage and industrial wastewater treatment in recent years. Emissions to natural water are the natural destination of effluent, and it is the most important way in our country.To the sewage treatment plant which have been completed, and its receiving waters are definite. Natural waters have the ability to dilution and purification the wastewater what it accepted, but this capacity is limited. With the effluents increased, it will aggravate the effluent to receiving water. And it also have impact on the repair process, the effluent may have an impact on the growth of plants. Therefore, Study on the effect of effluent met the standard from Sewage Treatment Plant on the receiving waters and subsequent repair plant, which has important theoretical and practical significance.This article analyzes factors like natural water, the amount of effluent and et, we obtained following important conclusion:The effect of effluent on organic matter content of the receiving water was very significant. The results show that organic matter and chlorophylls in the water increases along with the accept water. Compared with the control system, the COD of the 3# system lowed 32%, 2 #,4 #,5 # system COD increased 93% ,46% and 46% ; The chlorophylls of 3# system lowed 51.7%,2 #,4 # and 5 # system chlorophylls increased 129.9%,106.5% and 81.8%; It means that the effluent accelerate the succession of primary producers; this also shows that the algae are the main components to COD.With the effluent increasing, the total nitrogen in the water increased greatly, but the significant correlation was not found between total phosphorus and drainage water. According to the Redfield ratio, nitrogen and phosphorus in the control system 1# keep relative balance, while nitrogen in the control system 2# which has the fewest receiving water plays the role of restriction. With a further increase in the receiving water, phosphorus became a major limiting factor.The effect of effluent on TSS of the receiving water was very significant too. The effluent can raise the soluble inorganic salt notably; it may contribute to the accumulation of inorganic salts in the natural water, and may result in aquatic ecosystem degradation or increase the difficulty of repairing process, which may become more pronounced in arid areas.The effect of effluent on COD,TN,TP in surface sediment of the receiving water was very significant . the effluent dose not cause accumulation and settlement of COD,TN and TP in the sediment, but promote mineralization the organic matter mineral in the sediment and nitrogen and phosphorus released .When restoration of degraded river with plant, as the receiving waters of sewage treatment plants, used the waterweed as a repair plants, can be achieved a better effect than Hyd-rodictyon . A certain amount of effluent can have some form of coercion on the growth of plants, waterweed have stronger resistance to this stress and survive better.When addressed or design the sewage treatment plant, it is best to controlle the ratio of effluent and receiving water volume around 1:100, In the proportion, the effect of effluent met the standard from Sewage Treatment Plant on the receiving waters and subsequent repair plant are relatively small, COD, TN, TP of the receiving water can control at a relatively low level, and repair plant can survived well.