Study On New Technology For Eutrophication Control Of Source Water Of Chaohu Lake

According to the present eutrophication situation of Chaohu lake, this paper introduces two aspects to solve nitrogen and phosphorus eutrophication problems in the chaohu lake water. On the one hand, choosing the appropriate combination technics to process source water, on the other hand, reducing emission of the high concentration nitrogen,phosphorus in waste water by chemistry precipitation method.To the highly concentrated nitrogen/phosphorus waste water, MAP-Lime processing method was used in the work. The results indicated: (1)For the nitrogen- containing wastewater with a concentrations of 1623mg·L-1 adding MgCl2·6H2O and Na2HPO4·12H2O into the water, when the ratio of n(Mg):n(N):n(P) is 1.2:1:1.18, and pH is 9.0, after 20min's reaction, the ammonia nitrogen removal rate achieves above 99.1%. Separation and collecting MAP, then adds 0.2g·L-1 CaO to filtrate, responds 30min, Export of nitrogen and phosphorus in the water meets the first-level emission standard requirements. (2) For the phosphorous-containing wastewater with a concentrations of 1904mg·L-1, adding MgCl2·6H2O and NH4Cl into the water, when the ratio of n(Mg):n(N):n(P) is 1.15:0.85:1, and pH is 9.5, after a reaction time of 25min, the phosphorus removal rate achieves above 99.3%. Separation and collecting MAP, then adds 40mg·L-1 CaO to filtrate, responds 30min, Export of nitrogen and phosphorus in the water meets the first-level emission standard requirements.To the Chaohu Lake micropolluted source water, in the work we use preoxidation-flocculation-adsorption combination craft to process the algae, ammonia nitrogen, phosphorus and CODMn in chaohu lake water. The results indicated: Throws 1.6mg·L-1 potassium ferrate, after oxidizing 5min, then adds 40mg·L-1 poly-alumina iron after precipitation, water sample flows through the 9cm zeolite column in 10mL·min-1 current capacity, processing water volume reach 3.4L, algaes in the water is lower than 106·L-1, the ammonia nitrogen, the phosphorus and the CODMn content reached the Standards for Drinking Water Quality(GB5749-2006). It was also considered that the equipment choice, economic analysis in the two kinds of combination technics in this paper.