Step-feed CAST nitrite denitrifying phosphorus removal method and process control device thereof

Abstract

The invention discloses a step-feed CAST nitrite denitrifying phosphorus removal method and a process control device thereof and belongs to the technical field of SBR and modified process sewage biologic denitrification thereof. The device comprises a selector, a main reaction area, a water inlet pump, a stirrer, a submersible mixer, a return sludge pump, an aerator, an air compressor, a water decanter, a drain valve, a mud valve and a real-time control system. By adopting integration of a multiple-water inlet running mode and a real-time control system, an organic carbon source in the original sewage is furthest utilized and furthermore, the ammoxidation, denitrifying dephosphatation and phosphorus release time in each stage is scientifically and reasonably distributed. The anaerobic stirring time is increased and operation based on a variable-duration anoxic / aerobic mode is adopted, the anoxic phosphorus uptake effect of the selector in the aerobiotic time and the anoxic phosphorus uptake effect of the main reaction area in the anoxic time are reinforced, and the anaerobic stirring time and the aerobic aerating time are controlled by a real-time process control strategy.

Description

technical field [0001] The invention relates to segmented water inflow CAST (circulating activated sludge process) nitrite denitrification dephosphorization technology and a process control device thereof, which is suitable for the treatment of nitrogen and phosphorus industrial wastewater and the advanced treatment of urban sewage, and belongs to SBR (sequenced batch type) Activated sludge method) and its variant process wastewater biological denitrification technical field. Background technique [0002] The severe pollution and scarcity of water resources is a major international problem that plagues the world economy and human survival, especially the eutrophication caused by the discharge of a large amount of untreated or improperly treated sewage containing nitrogen and phosphorus. To an extremely serious point, many lake water bodies can no longer play their normal functions and seriously affect the industrial, agricultural and fishery production. my country's polluta...

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Problems solved by technology

The short-range denitrification technology has shown good application prospects in the denitrification treatment of various wastewaters. Researchers at home and abroad have also tried to combine it with different biological treatment processes. Although the nitrogen removal effect has been improved to a certain extent, but for sewage Phosphorus that needs to be removed at the same time in the process, under the condition of limited carbon source, the denitrification reaction is usually prioritized, resulting in unsatisfactory phosphorus removal effect of the process

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