A Membrane Bioreactor for Enhanced Biological Phosphorus and Nitrogen Removal in Treatment of Pickled Mustard Wastewater

Abstract

The invention discloses a membrane bio-reactor (MBR) used for treating preserved szechuan pickle wastewater and reinforcing biological phosphorous and nitrogen removal. An integrated reactor is formed by an A<2> / O process, a biological membrane process and the MBR. The MBR comprises an anaerobic tank, an anoxic tank, an aerobic tank, a feeding system, an aerating system, a drainage system and automatic control equipment, wherein semi-soft biological membrane fillers are put in the anaerobic tank, the anoxic tank and the aerobic tank; a membrane component is put in the aerobic tank, and a membrane separation region is not independently arranged. The reactor has the advantages that anaerobic phosphorus release and phosphorus accumulation in the aerobic tank are carried out via the sludge on the biological fillers in the anaerobic tank, thus increasing the total removal rate of phosphorus in the sewage; organic matters undergo hydrolytic acidification and organic nitrogen is aminated after the preserved szechuan pickle wastewater passes through the anaerobic tank; nitrification liquor in the aerobic tank flows back to the anoxic tank to form denitrification in the anoxic tank. The MBR has a simple structure and high pollutant treatment efficiency, is light in membrane pollution, and can simultaneously treat the pollutants such as organic matters, total nitrogen, total phosphorus, SS and the like of high salinity wastewater.

Description

technical field [0001] The invention belongs to the technical fields of sewage treatment and environmental protection, and in particular relates to a membrane bioreactor for intensifying biological phosphorus and nitrogen removal for treating high-salt, high-nitrogen and phosphorus pickled mustard wastewater. Background technique [0002] With the rapid economic development of the Three Gorges Reservoir area, the production scale of mustard mustard, a pillar industry, is getting larger and larger. During the production process, about 5 million cubic meters of untreated high-salt, high-nitrogen and phosphorus organic matter are discharged into the Three Gorges Reservoir area every year. Wastewater, that is, 22.25 million tons of organic matter (COD), 800,000 tons of nitrogen, and 130,000 tons of phosphorus discharged into the reservoir every year poses a serious threat to the water environment of the Three Gorges Reservoir area. The salinity of waste water produced by mustard...

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Problems solved by technology

[0008] Due to the combination of anaerobic tank-anoxic tank-aerobic tank and membrane bioreactor, on the one hand, the sludge settling performance in the reactor can not be affected by salinity, and on the other hand, it can overcome the single aerobic biofilm treatment. The disadvantage of low nitrogen and phosphorus removal efficiency in high nitrogen and phosphorus mustard wastewater is to improve the removal efficiency of the system for total nitrogen and total phosphorus

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