Composite efficient phosphorus removal agent as well as preparation method and application thereof

Abstract

The invention belongs to the field, and discloses a composite efficient phosphorus removal agent, a preparation method and application, and the composite efficient phosphorus removal agent comprises the following components in parts by mass: 85-93 parts of an inorganic salt solution, 0.5-1 part of an adsorbent, 6-14 parts of a coagulant aid and 0.05-0.1 part of scrap iron. The efficient phosphorus removal agent prepared by the invention has the advantages of simplicity in use, high phosphorus removal efficiency, synchronous and post phosphorus removal, small influence on a biochemical system, no influence on the chromaticity of sewage, good flocculating settling effect and the like, and is widely applied to the field of sewage treatment.

Description

technical field [0001] The invention belongs to the field of sewage purification and treatment in the technical field of environmental protection, and in particular relates to a composite high-efficiency phosphorus removal agent, a preparation method and an application. Background technique [0002] Excessive phosphorus in water bodies can cause eutrophication of water bodies, endangering ecosystems and human health. In order to control water pollution, the vast majority of municipal sewage plants in my country currently implement the first-class A discharge standard of the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB 18918-2002), which requires that the total phosphorus in the effluent does not exceed 0.5mg / L. [0003] For phosphorus removal in sewage plants, biological phosphorus removal and chemical phosphorus removal are currently the most widely used methods of phosphorus removal. Biological phosphorus removal is affected by sewage inflow conditio...

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Problems solved by technology

[0005] (1) Complicated use: the phosphorus removal agent in the prior art cannot be directly added to the aerobic pool of the biochemical system, it needs to be diluted, and it needs to be dispensed on site, which is not convenient enough to use

[0006] (2) Low phosphorus removal efficiency: in the prior art, the phosphorus removal efficiency of using iron salt or aluminum salt alone is low

[0007] (3) Synchronous phosphorus removal has a greater impact on the biochemical system: chemical phosphorus removal agents in the prior art include polyferric sulfate, polyaluminum chloride, and polyaluminum ferric chloride. These agents are mainly used for post-position phosphorus removal. It is seldom used for simultaneous phosphorus removal. Therefore, a large amount of aluminum salt will deflocculate the sludge, affect the microbial activity, and have a great impact on the biochemical system. The reaction of inorganic salts and adsorbents with phosphorus is not complete, and there are many residual chemicals, which will affect the sewage treatment system. Degradation of COD and ammonia nitrogen

[0008] (4) The sewage does not meet the standard, which affects the chroma of the water and is highly corrosive to the equipment: although the ferric salt has a good phosphorus removal effect, it will reduce the pH of the sewage and increase the chroma of the sewage, which may make other indicators of the sewage unsatisfactory. Up to standard, and highly corrosive to equipment

[0009] (5) The effect of flocculation and sedimentation is poor: the effect of SS adsorption and capture of small particles in water is poor, and the sedimentation speed is slow

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