Novel advanced wastewater treatment process for anaerobic system

Abstract

The invention discloses a novel advanced wastewater treatment process for an anaerobic system. 70-90% of COD (Chemical Oxygen Demand) is intercepted and removed in an IC (Internal Circulation) reactor, pollution of difficultly oxidized macromolecular organic compounds on water quality is reduced, a load of an MBR (Membrane Bio-reactor) is reduced, the service life of a biological membrane in the reactor is prolonged, the energy and treatment materials are saved, and the production cost is saved. Due to integrated mesh filtration and rotary stirring and high-efficiency aerobic and anaerobic reaction (biological oxidation reaction), the comprehensive effects of various devices in the process are achieved, large-particle solids, small-particle solids, colloids and floccules, most of organic pollutants and the like in mixed paper-making wastewater with complicated components are effectively removed, and the process is easy to realize and stable in operation. The whole system is high in operating load and relatively high in treatment efficiency, the COD in the recycled water is less than or equal to 100mg / L, the content of SS (Suspended Solids) is less than or equal to 50mg / L, the pH value is 7.2-7.4, the wastewater recycling standard and the national emission standard are met, advanced pollution cleaning is achieved, and the environmental benefits are high. The invention is applicable to the novel advanced wastewater treatment process for the anaerobic system.

Description

technical field [0001] The invention relates to the field of a novel anaerobic system advanced wastewater treatment process, in particular to a novel anaerobic system advanced wastewater treatment process. Background technique [0002] Papermaking industrial wastewater has a large amount of discharge, complex components, high chroma, high chemical oxygen demand, and poor biodegradability, especially containing refractory organic substances such as cellulose, hemicellulose, monosaccharides, lignin and their derivatives, which are easily It causes serious pollution and is difficult to treat with high-concentration organic wastewater. The United States lists papermaking wastewater as one of the six major public hazards. According to statistics, my country's pulping and papermaking wastewater discharge accounts for 1 / 6 of industrial wastewater, and COD and SS both account for 1 / 4. The water consumption per ton of paper in domestic paper mills is as high as 100m3, which is almost...

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Problems solved by technology

[0003] Now for the mixed papermaking wastewater with COD of 2400~3000mg / L and SS greater than 500mg / L, the removal rate of COD is about 60%~70% during the advanced treatment of anaerobic step in the existing process, and after the biological oxidation process, It is necessary to add a large amount of chemicals for impurity removal, which not only increases the load of the aerobic system and the amount of sludge growth, but also affects the water quality of reused water

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