Micro-electrolysis treatment technology for chemical waste water

Abstract

The invention belongs to the field of chemical waste water treatment, in particular to a micro-electrolysis treatment technology for chemical waste water. The method comprises the five steps of pretreatment of the waste water, homogenizing treatment of the waste water, biochemical treatment, precipitation and discharge and sludge treatment. According to the micro-electrolysis treatment technology for the chemical waste water, before the biochemical treatment of the waste water, the pretreatment steps of micro-electrolysis, coagulation precipitation, photo-catalytic oxidation and the like are conducted, wherein chromophoric groups and auxochrome groups in the waste water are removed through the micro-electrolysis treatment to achieve a discoloration purpose, so that compositions of the waste water are converted to be likely to occur biochemical reactions, and the biodegradability is greatly improved. Through the coagulation precipitation treatment, Fe(OH)2 and Fe(OH)3 are generated and precipitated with nascent-state Fe<2+> and Fe<3+> in alkaline environment; in cooperation with a flocculant PAM, original suspended solids, colloid, oil and the like and partial water-soluble organic matter in the waste water are gathered, adsorbed and condensed in order to be separated and precipitated from the waste water. Through the adoption of the photo-catalytic oxidation, the removal rate of the organic matter in the waste water reaches 40% or above, the B / C is increased to 0.4 or above, and favorable conditions are created for the subsequent biochemical treatment.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a micro-electrolysis treatment process of chemical wastewater. Background technique [0002] The main products are trichloroaniline, hydroxytoluene, superabsorbent fire extinguishing resin and isopropyl isocyanate in a pharmaceutical chemical factory. The process of raw material hydrolysis and centrifugation in the compartment for the production and sales of pharmaceutical chemical intermediates produces multiple streams of process wastewater , Water flushing pump waste water, condensate cooling water, kettle washing water and other waste water. Wastewater has complex components, high concentration, high quality of phenols and anilines, and color-developing organic substances in some raw materials, intermediate products and product residues. Among them, phenols have strong inhibitory effect on the metabolism of microorganisms. At present, biochemical proc...

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Problems solved by technology

At present, biochemical processes are generally used for the treatment of such pharmaceutical and chemical wastewater. It is difficult to effectively reduce the phenolic substances in the wastewater. It is difficult to ensure the normal domestication of microorganisms by directly using wastewater with a high content of phenolic substances into the biochemical system, resulting in poor biodegradability of wastewater, thereby increasing Reduced waste water treatment costs, effluent water quality is unstable

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