Research On The Lateral Flow Phosphorus Removal Strengthen Denitrification And Phosphorus Removal Of A~2/O System

In recent years, along with the problem of eutrophication more and more serious, and the growing concern about water pollution, national and local formulate more stringent effluent discharge standards. The technology of chemically enhanced biological phosphorus removal is an efficient process, and thus become the hotspot. This article investigates the lateral flow phosphorus removal enhanced the effect of denitrification and phosphorus removal in A2/O system, analyzes the influence of the coagulants type, lateral flow and water quality load, and considering the effect of chemical phosphorus removal and phosphorus sludge composition analysisAfter the complete research,we have obtained the following conclusions:(1) Lateral flow phosphorus removal system has good removal effect for the sewage contamination, with the lateral flow is0.4Q, the concentration of the effluent COD, ammonia nitrogen, TN and TP were25.64mg/L,1.98mg/L,12.82mg/L and0.47mg/L, effluent was reached "the urban sewage treatment plant emissions standards "(GB18918-2002) in A standard level, because of the contradiction between the nitrogen and phosphorus removal, TP can only reached in B standard, TP removal rate increases5.2%.(2) The lateral flow has a big effect to efficiency of the phosphorus removal, with the lateral flow is0.2Q,the removal efficiency of the sewage COD, ammonia nitrogen and TN removal is stable and efficient in system. Effluent COD, TN, ammonia nitrogen respectively less than29.43mg/l,13.48mg/l,1.92mg/l, removal rate can reach82.8%.73.1%.95.6%respectively, Effluent was reached "the urban sewage treatment plant emissions standards "(GB18918-2002) in A standard level. The average concentration of effluent TP is0.61mg/L, can only reached in B standard, but when the lateral flow for0.4Q and0.6Q, water COD, TN, ammonia nitrogen and TP all can achieve A level A standard.(2)Ferric chloride. Aluminum sulfate and Calcium hydroxide is three of the most commonly used coagulants at home and abroad, from the analysis of beaker test, In the best condition, the removal rate of TP of coagulants all can achieve80%, but comprehensive consideration of the effluent water, reagent cost and recycling, calcium hydroxide is the best choice.(4)After the clear liquid with rich phosphorus of the lateral flow sediment basins enter into the chemical phosphorus removal pool, the COD removal rate increases30%, ammonia nitrogen and TN removal rate almost did not change, the removal rate of TP is99%.(5)The main ingredient of phosphorus sludge of the chemical phosphorus removal pool is hydroxyapatite (HAP), phosphorus recovery is influenced by Ca/P, PH value and temperature, In Ca/P for2.5:1, PH of about8.5, temperature for30℃, can realize the maximum recovery phosphorus.The research shows that the method of lateral flow phosphorus removal strengthen A2/O system denitrification and phosphorus removal to deal with the urban sewage is feasible, this paper to solve the traditional process of denitrification and phosphorus problem is of some reference value, has the important meaning of technology innovation.