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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

Inactive Publication Date: 2014-04-16
CHINA AGRI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, the degradation ability of most microorganisms to nitrobenzene is less than 500mg / L, exceeding this range will cause the microorganisms to be poisoned and die
Therefore, especially for low-concentration (≤500mg / L) nitrobenzene wastewater, the traditional physical and chemical treatment methods have the problems of low treatment rate, high cost and secondary pollution, and an ecological treatment method with high efficiency and low consumption is sought very critical

Method used

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  • Combined constructed wetland treatment method and system for nitrobenzene wastewater

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Embodiment Construction

[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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Abstract

The invention belongs to the field of sewage treatment, and relates to a combined constructed wetland ecological treatment method and system for nitrobenzene wastewater. The system comprises a horizontal subsurface flow constructed wetland anaerobic bed (6), a tidal flow constructed wetland aerobic bed (11) and a deflection funnel type intermittent quantitative water feeder (9), wherein the anaerobic bed (6) is communicated with a precipitation tank (2) through a water inlet pipe provided with a water pump (3); wetland plants (5) are grown on the anaerobic bed (6); the aerobic bed (11) is composed of an upper tidal flow constructed wetland fine sand layer (10) and a lower high-adsorbability substrate layer; a siphon drainage pipe (14) is arranged at the water outlet of the aerobic bed (11); and the outlet of the siphon drainage pipe (14) is connected with the precipitation tank through an automatic flow-averaging regulator (12) and an automatic return pipe (13). The invention provides a horizontal subsurface flow-tidal flow combined constructed wetland ecological nitrobenzene treatment system according to the concept of complementary advantages.

Description

Technical field [0001] The invention belongs to the field of sewage treatment, and specifically relates to a combined artificial wetland ecological treatment method and system for nitrobenzene wastewater. Background technique [0002] Nitrobenzene is an important fine chemical intermediate and chemical raw material in the organic chemical industry. It can be used to synthesize fuels, medicines, pesticides, rubber, synthetic detergents, explosives and petrochemical products. However, nitrobenzene is a highly toxic chemical with strong carcinogenic and mutagenicity. Long-term human intake can cause skin inflammation, anemia, liver damage, and neurasthenia. Therefore, nitrobenzene is listed in my country. Priority control of environmental pollutants. Nitrobenzene is often discharged into environmental water bodies along with untreated sewage from explosive plants, organic chemical plants, or plastic manufacturing plants. The annual output of nitrobenzene in my country exceeds 800,0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/32C02F3/02C02F3/28C02F101/34C02F101/38
CPCY02W10/10
Inventor 吴树彪吕涛董仁杰刘芳
Owner CHINA AGRI UNIV
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