Method for preparing biopolymerization ferric sulfate

Abstract

A process for preparing BPFS by catalyzing and oxidizing ferrous sulfate with microorganism, which comprises following steps: taking industrial ferrous sulfate as raw materials, using industrial concentrated sulphuric acid to regulate pH according to the adding content of 10-13kg / m3, taking inorganic salt as nutrients, preparing ferrous sulfate reaction feed liquid whose total iron content is 20-100kg / m3, inducing ferrous sulfate thiobacillus into the reaction feed liquid, pumping in air with the speed of 9-15 L / L. min at indoor temperature, preparing BPFS stock solution whose total iron content is 20-100kg / m3 and reaction cycles are stable, mixing the stock solution with the reaction feed liquid with the same concentration, pumping in air according to the above conditions, preparing BPFS whose total iron content is 20-100kg / m3 under the catalysis of the bacillus, and controlling the concentration of Fe 2+ no higher than 0.3 kg / m3 at the reaction terminal. When the ferrous sulfate reaction feed liquid whose total iron content is more than 50kg / m3, firstly, 1 / 2 ferrous salt and concentrated sulphuric acid are added, and each residual is complemented when the concentration of Fe2+is lower than 3.0kg / m3.

Description

technical field [0001] The invention relates to a preparation method of polyferric sulfate, in particular to a preparation method of biopolymerized ferric sulfate, in particular to a method for preparing polyferric sulfate by catalyzing ferrous sulfate oxidation by microorganisms. Background technique [0002] Polyferric sulfate (PFS) is an inorganic polymer flocculant, the liquid is reddish brown, and the solid is yellow powder. PFS is superior to other inorganic flocculants in the removal of turbidity and COD, and has many advantages such as a wide range of pH values, non-toxicity, and low corrosion to equipment. Compared with traditional ferrous sulfate, aluminum sulfate, and polyaluminum , PFS has less dosage, fast coagulation, high floc strength, and has the characteristics of decolorization, sterilization, radioactive elements, heavy metal ions, and COD reduction. [0003] Japan successfully developed PFS in the 1970s and obtained a patent. Since the development in t...

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Problems solved by technology

In short, with NaNO 2 As a catalyst, residues in the product will have a certain impact on the treated water, especially drinking water, and at the same time discharge nitrogen oxides to pollute the environment, especially nitrosamines, which are easily produced by nitrites, are a carcinogen