Experimental Study On The Biological Treatment Of Taihu Grass Pressing Liquid

For Taihu plants squeezed liquid high organic concentration, characteristic of high levels of nitrogen and phosphorus, this study uses IC + A / O + coagulation sedimentation" technology to process it, the water can reach the "Integrated Wastewater Discharge Standard"(GB8978-1996) three emission standards. The results include the following aspects:(1)Using granular sludge digestion and sludge mixed with mud inoculation loop anaerobic reactor(IC) processing squeezed liquid of Taihu plants. Early start to take rapid increase load 4kg/(m3·d)and long-term stability in this way to start the load of sludge activity will help improve and accelerate sludge granulation. Debugging lasted95 d, gradually increase the water load, the researchers found that the maximum volume load IC can reach 18 kg /(m3·d), in order to stabilize the operation of IC reactor,reducing the volume load to 15 kg /(m3·d), this time COD removal efficiency of more than 85%.(2)Using A / O system processing IC anaerobic digestion, sludge concentration was maintained at 8000 ~ 12000 mg / L, dissolved oxygen control in 2 ~ 4mg / L, through tests proved 82 d, the system can run well, when the A / O when the influent COD and ammonia concentration system reached 2000 mg / L and 110 mg / L, COD and ammonia nitrogen removal rate reached more than 75% and 90%.(3)As a tertiary treatment using coagulation and sedimentation, after trials found,FeCl3 · 6H2 O as a coagulant can be a good Removal of phosphorus, at pH 10, coagulant dosage of 80 mg / l in the case TP removal rate can reach 91%, while the COD removal efficiency can reach 46%.(4)The research shows that the use of press technology for the future treatment of Taihu handle all types of aquatic plants provide more technology options, so that the processing of Taihu not limited to solid areas of waste water plants, the plants were able to properly handle the press Taihu salvaged plants, achieving plants reduction.