[Comprehensive treatment of aquariculture water pollution by flocculant and complex strain]

In order to purify aquariculture water, decrease fish-disease and sewage discharge, the purification efficiency of several types of flocculants such as PFS, PDMDAAC, EM, and combining PFS-PDMDAAC, PFS-PDMDAAC-EM used for treatment of soft-shelled turlle pond water were studied, and optimal mathematical of water qualities effected by several types of purification method were established. The results showed that the comprehensive treatment had the best purifcation efficiency, the flocculation rate was above 98%, CODcr removed rate was above 95%, BOD5/CODcr of pond water and effluent decreased from 0.61 and 0.51 to 0.24 and 0.29 respectively, the biodegradable matter in waters have been effectively removed, when 30 mg.L-1 PFS, 0.5 mg.L-1 PDMDAAC and 30 ml.m-3 EM were added. The various major water qualities were keeded stabilization and had attained special aquariculture water quality standard. The water qualities of pond water and that of effluent were showed no difference, which had attained pollution-free discharge and ecological equilibrium aquariculture.