Sewage advanced phosphate removal system, and treatment method adopting system

Abstract

The invention relates to a sewage advanced phosphate removal method and apparatus. The apparatus concretely adopts a composite nanomaterial and a physical adsorption technology of an upward flow filter tank to carry out advanced removal of phosphorus in sewage, and the apparatus is composed of a rapid mixer and the upward flow filter tank. The method comprises the following steps: 1, adding a composite nano-adsorbent into the rapid mixer, and fully mixing the composite nano-adsorbent with sewage; 2, allowing the above obtained mixed solution to flow into the upward flow filter tank, filtering the mixed solution in a water bottom feeding and water top discharging form, and carrying out a flocculation, net capturing and precipitation reaction on the mixed solution in a filter material chamber to make phosphorus-containing flocs be intercepted on the surface of a filter material; and 3, stopping water feeding when the filtering water head loss of the filter tank reaches a certain value, backwashing to peel the phosphorus-containing flocs adhered to the filter material, and discharging the flocs out of the filter tank together with backwashing wastewater. The method and the apparatus have the advantages of high treatment efficiency and short stay time, and allow the total phosphorus content of treated outlet water to be 0.2 mg / l or less.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a deep phosphorus removal system for sewage and a phosphorus removal method using the system. Background technique [0002] Phosphorus is the controlling factor for the eutrophication of most water bodies, so it is particularly important to control the concentration of phosphorus. The first-level A standard of the comprehensive discharge standard for sewage plants in my country (GB8978-1996) is phosphate (calculated as P) ≤ 0.5 mg L -1 , How to reduce the operating cost of the sewage plant on the premise of ensuring that the phosphorus content in the effluent reaches the standard is an urgent problem to be solved. [0003] Adsorption method is a method of phosphorus removal in sewage that has received attention in recent years, that is, the adsorption affinity of phosphate ions in water to the adsorption material with porous structure or large specific surface area is used to reali...

AI Technical Summary

Problems solved by technology

However, at present, the composite phosphorus removal adsorbent is still in the experimental research stage, and there are few economical and stable treatment processes combined with it.

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