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In recent years, China's water eutrophication situation intensifies and \One of the challenges. Phosphorus is considered to be the main factor controlling eutrophication occurred, phosphorus wastewater treatment and reduce the phosphorus concentration of the water bodies to prevent water eutrophication or exacerbate essential. In the existing phosphorus removal method, chemical flocculation method is more common and stable effect. Somehow rich source of smelting slag for phosphorus removal materials, preparation of the modified phosphorus removal flocculant, study the flocculants wastewater phosphorus removal efficiency and optimal experimental conditions, and the actual sewage water samples flocculation test, the flocculation behavior and mechanism analysis. Experiment to obtain the following results: TP = 0.5mg / L Simulated wastewater, waste residue after hot acid modified as phosphorus removal flocculant dosage to 600mg / L, the removal rate of phosphorus 99.5%, compared with the native residues, increased 8.7%, while consumption decreased by 25%. Meanwhile, the modified slag dephosphorization desired reaction time, and not interested in the treated wastewater pH greater impact. Improve phosphorus removal is mainly due to the modified process conducive phosphorus removal of substances generated and material increase of surface area. The flocculant used traditional phosphorus removal flocculant treatment of simulated wastewater effluent residual phosphorus concentration minimum, up to 0.05mg / L or less, and have less impact on the effluent pH, settling properties at the same time is also good. Raw material waste, the cost is not high, so has certain advantages. The flocculant used in the treatment of actual sewage water samples for initial phosphorus concentrations were 1.79 mg / L, 0.78mg / L, 10.13mg / L East Lake, South Lake and sewage water samples, phosphorus removal rate reached 97.3%, 94.5%, 95.9%, East Lake and South Lake water TP treatment indicators can reach the surface water environmental quality standards (GB3838-2002) in the Class II standard, the TP indicator of sewage to achieve life Integrated Wastewater Discharge Standard (GB18918-2002), the basic control project a maximum allowable emission concentration standard. Flocculation and settling of the floc formed after treatment performance better settlement in a relatively short period of time at the bottom of the settlement 30min after water turbidity were 3.2NTU, 1.7NTU and 5.3NTU. The same time the the flocculant addition of COD, TN, SS, other indicators have certain removal of certain practical value.
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