Combined constructed wetland treatment method and system for nitrobenzene wastewater

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 in particular 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 mutagenic properties. Long-term ingestion of human beings can cause skin inflammation, anemia, liver damage, neurasthenia and other diseases. Therefore, nitrobenzene is listed as a Priority control of environmental pollutants. Nitrobenzene is often discharged into environmental waters along with raw sewage from explosives factories, organic chemical plants or plastics manufacturing plants. The annual output of nitrobenzene in...

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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

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