Compound type water treatment flocculating agent and preparation method thereof

Abstract

The invention discloses a compound type water treatment flocculating agent and a preparation method thereof and belongs to the field of waste water treatment. The flocculating agent is prepared from ferrous sulfate, sodium silicate, zinc salt, magnesium salt, hydrogen peroxide, concentrated sulfuric acid, and distilled water and the preparation method comprises the steps of activating, oxidation, mixing, curing and the like. The compound type water treatment flocculating agent disclosed by the invention has the benefits of simple preparation technology, low cost, high convenience in product application and good stability, is suitable for flocculation treatment of sewage and has good effects on sewage in COD reduction, phosphorous removal and de-coloration.

Description

technical field [0001] The invention relates to the preparation and application of a flocculant, in particular to the preparation and application of a composite water treatment flocculant, belonging to the field of wastewater treatment. Background technique [0002] Flocculant plays a very important role in sewage treatment. Inorganic polymer flocculant is the mainstream product and main research direction of inorganic flocculant. It is a new type of water treatment developed on the basis of traditional aluminum salt and iron salt flocculant. Agents mainly include the following series: polyaluminum chloride (PAC), polyaluminum sulfate (PAS), polyferric chloride (PFC) and polyferric sulfate (PFS), etc. [0003] After the aluminum-based flocculant treats sewage, the aluminum enters the drinking water through the water cycle and causes a variety of diseases, threatening human health; and the iron-based flocculant is less harmful to the environment and human health after use, an...

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Problems solved by technology

[0004] Polysilicoferric sulfate is a relatively new type of water treatment agent developed on the basis of active silicic acid and polyiron. It is a composite flocculant prepared by introducing metal iron ions into active silicic acid. Polysilicic acid It can strengthen the cohesion and aggregation ability of iron polymers, and an appropriate amount of iron ions can prolong the gelation time of polysilicate. The combination of the two can enhance the flocculation effect of the flocculant, but the polysilicon ferrosilicon flocculant is also unstable in long-term storage. , Phosphorus removal effect is not ideal and other shortcomings, so how to improve the stability of polysilicon ferric sulfate flocculant, phosphorus and nitrogen removal effect has become a problem to be solved

[0005] The preparation of flocculants introduced in CN101077806B, CN102259963A, and CN1162345C all adopt aluminum salt as the main raw material. Due to the biotoxicity of aluminum, this type of flocculant has been difficult to adapt to the requirements of modern environment-friendly medicaments; CN102372309A introduces a , concentrated sulfuric acid, ferrous sulfate, sodium chloride, magnesium carbonate, the water purifying agent that hydrogen peroxide prepares, and its share of hydrogen peroxide is too high and causes production cost too high; Introduced a kind of by biological enzyme, microorganism, plant Water purifiers prepared from extracts, etc., are expensive due to the high price of enzyme preparations and have bioselectivity for wastewater treatment, resulting in high production costs and poor general applicability

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