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Combined effluent treating process of photooxidizing Fenton's reaction, flocculation and microbial degradation

A technology of microbial degradation and Fenton reaction, applied in flocculation/sedimentation water/sewage treatment, chemical instruments and methods, light water/sewage treatment, etc., can solve problems such as high cost, large amount of reagents, harsh reaction conditions, etc.

Inactive Publication Date: 2005-07-13
NANJING UNIV
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Problems solved by technology

However, there are still many problems in the use of light-assisted Fenton reaction technology to treat wastewater, mainly due to the large amount of reagents and harsh reaction conditions.
Therefore, when treating wastewater, using this technology to "one-stop" to meet the discharge standards requires a higher cost.

Method used

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  • Combined effluent treating process of photooxidizing Fenton's reaction, flocculation and microbial degradation

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Embodiment Construction

[0032] The treatment object of the present invention is phenol and carbendazim pesticide wastewater: the values ​​of COD before treatment are 1500mg / L and 20000mg / L respectively.

[0033] Light-assisted Fenton reaction conditions: Add 12.4mL H to 1 liter of wastewater 2 o 2 , 8mL 1mol / L FeSO 4 solution. A light source with 1-3 low-pressure mercury lamps and 1-3 medium-pressure mercury lamps connected in series is used, and the light source is installed in parallel in the photochemical reaction pool. The light source is placed in the quartz sleeve, and the two ends of the quartz sleeve are fixed and sealed on the photochemical reaction tank. The waste water flows into the box from the lower part of the photochemical reaction tank, and can also flow out from the upper part and then flow back into the prereactor. The waste water is photochemically processed in the reaction tank. Help Fenton reaction; react in the presence of light for 0.5-2 hours;

[0034] After the reaction,...

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Abstract

The combined effluent treating process includes the first photooxidizing Fenton's reaction with oxidant H2O2 and HClO and reductant Fe ion in the action of light for 0.5-2 hr; the subsequent flocculation with aluminum salt, iron salt, complex salt or other flocculant and polyacrylamide as flocculation assistant; and final microbe degradation. The said combined effluent treating process has powerful synergistic effect and COD eliminating rate as high a 98.9 %.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating wastewater by combining light-assisted Fenton reaction, flocculation and microbial degradation. Background technique [0002] The light-assisted Fenton reaction technology belongs to the advanced oxidation process (Advanced Oxidation Process, referred to as AOPs), which was used in the research of wastewater treatment in the early 1990s. The principle is: using H 2 o 2 , Fe 2+ As an oxidant and a reductant, with the participation of UV, on the one hand, a large amount of active oxygen (such as HO , O 2 ·, O 2 ·- etc., wherein the oxidation potential of HO is 2.8V, which is the strongest oxidant after fluorine), so that the organic matter can be completely oxidized; on the other hand, the toxic organic matter that is difficult to degrade often contains unsaturated bonds, polycyclic or Heterocyclic structure, they are easier to d...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/52C02F1/72C02F9/14
Inventor 刘光明孔令仁钟萍周霞任学昌史载锋
Owner NANJING UNIV
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