Nitrogen-phosphorus wastewater treating method by sequencing batch reactor coupled photobioreactor

Abstract

The invention relates to the field of environmental wastewater treatment, specifically to a nitrogen-phosphorus wastewater treating method by a sequencing batch reactor coupled photobioreactor. The method provided by the invention is characterized in that it comprises the following steps of: removing impurities and sediments of high concentration nitrogen-phosphorus wastewater and then treating the wastewater by using active sludge in the sequencing batch reactor, decanting a supernatant from the sequencing batch reactor, adding the supernatant into a membrane bioreactor for further aerobic treatment, filtering by ultrafiltration membrane in the membrane bioreactor to remove micro-suspension and bacteria, adding a generated ultrafiltration supernatant into a photobioreactor, disinfecting by ozone and adding algae filament as well as a few necessary nutrient salt, filling with carbon dioxide waste gas to perform microalgae cultivation, discharging a algae liquid after a microalgae growth cycle and adding the algae liquid into a flocculating settling pool for sedimentation, standardly discharging or reusing a supernatant liquor, compressing the concentrate algae liquid at the bottom into a microalgae cake by a plate and frame filter press. The invention has advantages of wide range of treated nitrogen-phosphorus wastewater water quality variation and production of economical microalgae with the utilization of nitrogen and phosphorus nutrients in wastewater as more as possible.

Description

[technical field] [0001] The invention relates to the field of environmental protection sewage treatment, in particular to a method for treating nitrogen and phosphorus sewage with a sequencing batch reactor coupled with a photobioreactor. [Background technique] [0002] Eutrophication refers to the phenomenon of water pollution caused by excessive plant nutrients such as nitrogen and phosphorus. Eutrophication restricts the sustainable economic and social development of lake basins, and has become one of the most serious ecological and environmental problems in the world. The discharge of high-concentration nitrogen and phosphorus sewage, such as livestock manure and washing sewage, human feces sewage, nitrogen fertilizer plant sewage, monosodium glutamate plant sewage, soybean product processing plant sewage, sewage plant sludge supernatant and filtrate, etc., is causing eutrophication of water bodies one of the main reasons. However, high-concentration nitrogen and phos...

AI Technical Summary

Problems solved by technology

However, the conditions for cultivating economical microalgae are relatively harsh, while the situation of nitrogen and phosphorus sewage is ever-changing, and it is not suitable for cultivating microalgae without treatment. It is necessary to carry out targeted pretreatment on the nitrogen and phosphorus sewage to be used to make the physical and chemical properties of sewage The indicators meet the basic requirements for microalgae cultivation before they can be used for microalgae cultivation

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