Method for removing total phosphorus in waste water through chemical/biological reaction synergistic effect

Abstract

The invention discloses a method for removing total phosphorus in waste water through a chemical / biological reaction synergistic effect. According to the invention, the advantages of chemical phosphorus removal and biological phosphorus removal are combined, and the synergistic effect of chemical and biological phosphorus removal is adopted. The total phosphorus in the waste water is removed through discharging sludge formed by high-phosphorus-content sludge and phosphorus-containing precipitates mainly containing struvite in a preaeration tank. The method disclosed by the invention is simply operated; the removal rate of the total phosphorus is up 96.8%; when the total phosphorus is removed, parts (30-40%) of organic pollutants and nitrogen can be removed, so that the burdens of subsequent aerobic biological treatment and deep treatment can be alleviated.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for removing total phosphorus in wastewater. Background technique [0002] After the water body is polluted by phosphorus, the process of eutrophication can be greatly accelerated. It is generally believed that the water body with total phosphorus reaching 0.02mg / L indicates that it is already in a state of eutrophication. Therefore, the phosphorus content in wastewater is an important pollution indicator. It is expected that during the "13th Five-Year Plan" period, phosphorus will be fully included in the assessment indicators of water body discharge. [0003] Phosphorus, unlike nitrogen, cannot form oxidized or reduced forms and is released into the atmosphere in gaseous form. However, phosphorus can be converted between solid state and dissolved state; the method of phosphorus removal from wastewater is developed based on this form conversion of pho...

AI Technical Summary

Problems solved by technology

[0006] This method has a low total phosphorus removal rate and is suitable for treating low-concentration total phosphorus (generally less than 50mg / L) wastewater. It needs to be carried out under anaerobic-aerobic conditions, and the operating conditions are more complicated. Periodic (sludge age is about 7 days) Discharge sludge, which has a certain removal effect on organic matter

[0007] The above two methods have their own advantages and disadvantages, and both have certain limitations when used.

For wastewater with high organic concentration (COD1000~5000mg / L) and high phosphorus (TP100~500mg / L), using chemical methods alone requires a large amount of chemicals and high operating costs, making it difficult to meet the removal requirements for organic matter; using biological methods alone is difficult to achieve Total phosphorus and organic matter removal requirements

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