Step-feed CAST nitrite denitrifying phosphorus removal method and process control device thereof
A technology for denitrification phosphorus and nitrite removal, which is applied in the field of segmented water inflow CAST nitrite type denitrification phosphorus removal technology and its process control device, which can solve problems such as unsatisfactory phosphorus removal effect
Inactive Publication Date: 2015-07-01
LANZHOU JIAOTONG UNIV
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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
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[0056] The actual domestic sewage discharged from a family area of a university was used as the experimental object (pH=6.5~7.8, COD=260~350mg / L, TN=35~65mg / L, TP=3.5~7.5mg / L). The selected CAST reactor has an effective volume of 54L, the initial MLSS in the reactor is 3.5-4.0g / L, and the aeration rate is constant at 0.5m 3 / h, the mud age is maintained at about 10d, and the reaction temperature is 22°C. Utilize CAST segmented water inlet to strengthen denitrification and phosphorus removal technology and its process control device, the treated water volume is 18L, and the number of segments is 3 times. The final effluent COD is less than 50mg / L, total nitrogen is less than 10mg / L, and total phosphorus is less than 0.5mg / L , which is lower than the concentration required by the national first-level emission standards.
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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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Inventor 马娟俞小军孙雷军孙洪伟陈永志
Owner LANZHOU JIAOTONG UNIV
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