2001 752 keys of water system of river of 7 great river monitor section in, the section that has 27 % satisfies 1 ～ 3 kinds of standards, the section of 14 % is 4 kinds of standards, the section water quality of close 59 % is 5 kinds or bad 5 kinds. Main contaminant is ammoniac nitrogen, CODMn, BOD, volatilize phenol and oil kind. Among them, cause water system the main nutrition composition of eutrophication is organic carbon, nitrogen, phosphor, Potassium, iron to wait. After organic carbon is handled via common live thing but basic purify, the other part besides NP is raised relative to Yu Fuying change the demand in producing a course extremely low, do not comprise the limitative gene of eutrophication. Causing the main factor that alga breeds in great quantities is nitrogen and phosphor, and the 1/ 20 left and right sides that alga is pair of nitrogen demand about to phosphorous demand, because this controls contaminative source, reduce the nitrogen in sewage, especially phosphorous content is to prevent water system the key of eutrophication.

Develop as economic high speed and increase of urban population ceaselessly, especially in development of a wide place in the road is rapidder, sewage treatment plant does not follow to go up the need of development, cause a large number of sewage to did not get be handlinged completely emiting into water system, more fast water system the process of eutrophication. Carbon of sewage of a wide place in the road in how be being solved accordingly, nitrogen, phosphor amounts to mark to discharge, control water system eutrophication is urgent affairs. For this, the country was promulgated about the branch a series of regulation and policy, made 1996 " sewage discharges a standard integratedly " (GB8978 - 1996) , stipulate one class discharges 15 Mg/ L of standard ammonia nitrogen, phosphatic 0.5 Mg/ L, 2 class discharge a standard to set ammoniac nitrogen 25 Mg/ L, phosphate 1. 0 Mg/ L, in the key such as fountainhead groove guard area should increase to take off azotic establishment except phosphor. On May 29, 2000, ministry of construction ministry, total bureau of national environmental protection, science and technology was promulgated jointly " urban sewage disposal and policy of pollution prevention technique " the target that raised sewage disposal of our country near future: 210 years the whole nation sets city town and foul water of organizational system town average processing is led not under 50 % , the sewage disposal of the city that establish town is led not under 60 % , key city sewage disposal is led not under 70 % , tourist attraction of the residential area that stipulates to cannot be being brought into urban foul water collects a system, travel, go vacationing the industrial waste water of the sewage that the ground discharges the crowd inhabit a region that divide into equal parts of developing zone of station of village, sanatorium, airport, railroad, economy comes loose and independent factory area should be located in. And our country environmental protection " 15 " mix to the whole nation in the plan " 3 rivers 3 lakes " the ammoniac nitrogen in waiting for key area sewage is discharged practice gross control, and be opposite too the total phosphor make known to lower levels of pool of another name for Yunnan Province and lake, mew lake the quantity that enter a lake and discharge capacity index. However the population that our country has 80 % is in a country, urban suburban district also has a lot of cities to manage a network hard outspread a lot place, be in district of a lot of town, the popularity rate of sewer and use efficiency is very low. These are town the application of equipment of small-sized sewage processing and development provided vast space.
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