Combined constructed wetland treatment method and system for nitrobenzene wastewater
A technology for nitrobenzene wastewater and constructed wetlands, which is applied in aerobic process treatment, biological water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of microorganisms being poisoned and killed, low treatment rate, secondary pollution, etc. , to achieve high-efficiency and low-consumption ecological treatment, increase contact opportunities, and luxuriant roots
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[0025] The present invention will be described in further detail below with reference to the drawings and signs.
[0026] Low-concentration (≤500mg / L) nitrobenzene wastewater is mixed in the sedimentation tank 2 through the inlet pipe 1 and the system backflow water, and then continuously pumped into the horizontal submerged constructed wetland inlet area 4 by the pump 3 to make the horizontal submerged constructed wetland The bed has been submerged for a long time, so it presents a relatively anaerobic environment. Wastewater flows through the anaerobic bed 6 of the horizontal underflow constructed wetland. Nitrobenzene and nitrate in the return water use the organic matter secreted by the roots of the wetland plants 5 as a carbon source and a relatively anaerobic environment to reduce nitrobenzene to lower toxicity It is also easier to remove aniline and nitrate by denitrification. The effluent of the horizontal subsurface flow constructed wetland continuously flows into the d...
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