Biological treatment system and method for fixed-bed gasification waste water

Abstract

The invention especially relates to a biological treatment system for fixed-bed gasification waste water, which belongs to the field of water treatment technology. The system comprises a water inlet pipe, a water outlet pipe, a reinforced dephenolization apparatus, a reinforced denitrification apparatus, an intermittent fluidization biofiltration apparatus, an aeration apparatus and an alkali addition apparatus, wherein the reinforced dephenolization apparatus, the reinforced denitrification apparatus and the intermittent fluidization biofiltration apparatus are successively connected and separately connected with the aeration apparatus and the alkali addition apparatus; the reinforced dephenolization apparatus is internally provided with a plurality of carriers A used for immobilizing dephenolization bacteria; the reinforced denitrification apparatus is internally provided with a packing layer formed by a plurality of carriers B, and carriers C and carriers D are included in the carriers B; and the intermittent fluidization biofiltration apparatus is internally provided with a porous lifter plate and a packing layer formed by the carriers D. The system integrates the advantages of immobilized microorganism technology and biological reinforcement technology and has improved integral denitrification and dephenolization effect through optimized combination of three functional zones, i.e., a reinforced dephenolization zone, a reinforced denitrification zond and an intermittent fluidization biofiltration zone.

Description

technical field [0001] The invention relates to a water treatment technology, in particular to a fixed-bed gasification wastewater biological treatment system and method. Background technique [0002] Coal gasification occupies an important position in my country's energy and chemical industry, but wastewater treatment has become a key issue restricting the development of this industry. In my country, a large number of coal-to-clean gas uses fixed-bed gasification technology. The outlet of the fixed-bed gasifier needs to be sprayed and cooled with circulating cooling water, and at the same time, the organic impurities, undecomposed gasification agent, tar and gas ash carried by the gas are washed down, resulting in a large amount of wastewater, which contains high concentrations of ammonia nitrogen and phenolic substances. At home and abroad, the process route of pretreatment + biological treatment + advanced treatment is generally used to treat fixed bed gasification wast...

AI Technical Summary

Problems solved by technology

The existing biological treatment technology is still dominated by the activated sludge method, which can remove phenolic compounds and COD, but the nitrifying bacteria are easily inhibited, the nitrification is unstable, the hydraulic retention time is very long, and the sludge bulking is prone to occur , the effluent ammonia nitrogen and COD are difficult to meet the first-level emission standards

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