Phosphorus removal agent for sewage treatment and preparation method thereof

Abstract

The invention discloses a phosphorus removal agent for sewage treatment. The phosphorus removal agent is prepared from the following raw materials in parts by weight: 45-55 parts of ferrous sulfate pentahydrate, 12-16 parts of polyaluminum chloride, 20-27 parts of polyaluminum ferric silicate and 25-33 parts of hydroxyl iron modified montmorillonite. According to the phosphorus removal agent for sewage treatment, the raw material composition is carefully selected, the content of each raw material is optimized, ferrous sulfate pentahydrate, polyaluminum chloride, polyaluminum ferric silicate and specially-made hydroxyl iron modified montmorillonite in a proper proportion are selected, the advantages of each raw material are fully exerted, mutual complementation and mutual promotion are achieved, the product quality is greatly improved, the prepared phosphorus removal agent for sewage treatment is high in phosphorus removal rate and low in turbidity of treated water, and is an efficientphosphorus removal agent for sewage treatment.

Description

technical field [0001] The invention relates to the field of water treatment reagents, in particular to a phosphorus removal agent for sewage treatment and a preparation method thereof. Background technique [0002] With the rapid development of our country's economy, a large amount of phosphorus-rich sewage is discharged into sensitive water environments such as rivers, lakes, and oceans without treatment or is not up to standard, resulting in eutrophication of water bodies, and even black and odorous water bodies. Phosphorus is the key factor. When the environment When TP≥0.02mg / L in the water body, the water body begins to lack oxygen and presents a state of eutrophication [1-2]. Therefore, industrial and agricultural wastewater and domestic sewage should be denitrified and dephosphorized before being discharged into water bodies. Especially for sensitive areas such as key lakes, important reservoirs, and coastal water catchment areas, a reasonable and appropriate upgrad...

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Problems solved by technology

However, the phosphorus removal agent A can only be used when the pH of the sewage is 7.5-8.5, and the phosphorus removal agent B can only be used when the pH is 6.5-7.5. It is often necessary to adjust the pH of the sewage, and it is also easy to block the pipes, which cannot meet the needs of sewage. Phosphorus removal needs

[0005] CN105502610A discloses a high-efficiency sewage phosphorus removal flocculant, the composition of the high-efficiency sewage phosphorus removal flocculant is: water, 30-40 parts; potassium perchlorate, 4-8 parts; sodium silicate, 20-30 parts; Iron, 25 to 35 parts; a mixture of aluminum sulfate and magnesium sulfate, 35 to 45 parts; wherein, the weight ratio of aluminum sulfate and magnesium sulfate is 3 to 5:1, but this sewage dephosphorization agent mainly treats phosphorus content up to 6mg / L of domestic sewage cannot meet the demand for phosphorus removal in sewage

[0007] 1. Small adsorption capacity and low adsorption removal rate;

[0008] 2. For some sewage with high phosphorus content, the adsorption removal rate is lower, which cannot meet the demand for phosphorus removal;

[0009] 3. The use conditions (such as pH value) are relatively harsh, which increases the cost of phosphorus removal, and the adsorption and removal rate of phosphorus is low

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