Multi-dimensional multi-phase multi-process coupling analog method of activated sludge sewage treatment

Abstract

The invention discloses a multi-dimensional multi-phase multi-process coupling analog method of activated sludge sewage treatment. According to the -dimensional multi-phase multi-process coupling analog method, based on a multi-phase flow theory, activated sludge used as a solid phase, a gas phase (bubbles) aerated in an activated sludge system and a liquid phase (sewage) form a three-phase composite system, a sludge-water-gas movement characteristic and an interphase physical function in a sewage treatment system are reasonably described by adopting a multi-phase flow movement equation; and meanwhile, an oxygen mass transfer equation and a pollutant migration and transformation equation are further combined, and a distribution characteristic of dissolved oxygen in a system, a migration and transformation characteristic of pollutants and an interphase biochemical action characteristic are accurately predicted. By adopting a coupling model disclosed by the invention, the part of an activated sludge system, at which sludge easily deposits, and effluent quality conditions under different working conditions can be quantitatively predicted, and the great significance is achieved for the maintenance of normal operation in a sewage treatment plant.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, and relates to a physical, chemical and biological process coupling simulation method in activated sludge water treatment. Background technique [0002] At present, the situation of water pollution in our country is very serious. According to the monitoring results of the environmental department, the water quality of more than half of the seven major river systems in my country is polluted, 1 / 3 of the water bodies in the country are not suitable for fish survival, 1 / 4 of the water bodies are not suitable for irrigation, and 90% of urban waters are seriously polluted. 50% of urban water sources do not meet drinking water standards, 40% of water sources are no longer drinkable, and the main pollutants are ammonia nitrogen and COD Mn , BOD, volatile phenols and petroleum substances. Therefore, strictly controlling the discharge of sewage up to the standard and effectively i...

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Problems solved by technology

At the same time, aeration is also a crucial step in the process of sewage treatment. Aeration provides sufficient dissolved oxygen for the aerobic reaction of activated sludge by filling air or oxygen into the activated sludge reactor. Therefore, from this perspective From the looks of it, the aeration process is actually an interphase interaction process between the gas phase and the liquid phase, but so far there is no report that couples the mass transfer process between the gas and liquid phases into the model

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