Phosphate adsorbent capable of being repeatedly used and preparation method thereof

Abstract

The invention belongs to the technical field of sewage treatment and particularly relates to a phosphate adsorbent capable of being repeatedly used and a preparation method thereof. According to the adsorbent, a porous carrier serves as a core, and the surface of the carrier is coated with a metallic oxide layer. The weight of the metallic oxide layer accounts for 3-25% of the total weight of the adsorbent. The porous carrier is one or a combination of silicon oxide, aluminum oxide, manganese oxide, zeolite, activated carbon and diatomite. The metallic oxide layer is prepared from, by weight, 20-50% of iron oxide, 50-80% of alumina, 0-20% of manganite and 0-20% of titanic oxide. The prepared phosphate adsorbent can be repeatedly used, use cost is greatly reduced, the adsorption capacity of the phosphate adsorbent is high, use is convenient, the removal rate of phosphate in sewage reaches 98% or above, and adsorption efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a reusable phosphate adsorbent and a preparation method thereof. Background technique [0002] In recent years, with the strengthening of water pollution control, the discharge standards have been increased year by year, and the concentration of phosphate in the discharge water has become increasingly strict. In traditional urban sewage treatment plants, a chemical coagulation sedimentation method is added in front of the existing discharge water pipeline. Although this method can reach the phosphate concentration standard (<0.5mg-P / L), it has a high one-time investment and a large land area , high operating costs and increased sludge volume. In the future, the sewage discharge standard may be lowered to less than 0.3mg-P / L. The chemical coagulation sedimentation method is difficult to meet the standard. If it is to meet the standard, more chemicals must be added, wh...

AI Technical Summary

Problems solved by technology

In traditional urban sewage treatment plants, a chemical coagulation sedimentation method is added in front of the existing discharge water pipeline. Although this method can reach the phosphate concentration standard (<0.5mg-P / L), it has a high one-time investment and a large land area , high operating costs and increased amount of sludge

In the future, the sewage discharge standard may be lowered to less than 0.3mg-P / L. The chemical coagulation and sedimentation method is difficult to meet the standard. If it is to meet the standard, more chemicals need to be added, which will generate a lot of sludge and increase the total load on the environment.

The remediation plan of lakes and rivers does not include the project of phosphorus removal. Algae will multiply when the phosphate concentration is above 0.05mg-P / L. At present, there is a lack of simple and effective phosphate removal technology, so the problem of cyanobacteria in lakes and rivers has always existed.

[0003] It can be seen that the above-mentioned existing phosphate removal methods for wastewater and water either still have many deficiencies, or there are no countermeasures, and a technological breakthrough is urgently needed. Therefore, an effective adsorbent is sought that can quickly absorb phosphate in water and can be reused

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