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Sewage treatment method and device by taking zero-valent iron powder as carrier

A sewage treatment method and zero-valent iron technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, chemical/physical/physicochemical fixed reactors, etc., can solve the problem of small dispersion distance and low degradation efficiency of organic pollutants and other problems to achieve the effect of avoiding secondary pollution, not easy to rust, and high removal efficiency

Inactive Publication Date: 2014-12-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of too small dispersion distance of HO in water and low degradation efficiency of organic pollutants in the traditional advanced oxidation process (AOPs), the purpose of this invention is to propose a method that is easy to operate, safe, high in pollutant degradation efficiency, and not easy to decompose. Sewage treatment method and device for producing secondary pollution

Method used

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  • Sewage treatment method and device by taking zero-valent iron powder as carrier

Examples

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Embodiment 1

[0027] Example 1: In this example, the volume of the improved sequencing batch reactor is 3.0 L, and sewage is fed in until the volume accounts for 2 / 3 of the reactor capacity. The initial concentration of chloramphenicol (CAP) was 36 mg / L, adding K 2 S 2 o 8 The concentration is 3240 mg / L, and the amount of zero-valent iron powder added is 150 mg. The timing of water intake, feeding, stirring, static settling, drainage and slag discharge is precisely controlled by the time controller. After entering the sewage, add K at the same time 2 S 2 o 8 and zero-valent iron powder, after the addition is completed, start to stir; after stirring for 2 hours, settle for 2 days; discharge slag after draining. The effluent results after operation are: the concentration of CAP in sewage is 0 mg / L, the removal rate of CAP is 100%, and the removal rate of TOC in sewage is 86%.

Embodiment 2

[0028] Example 2: In this example, the volume of the improved sequencing batch reactor is 3.0 L, and sewage is fed until the volume accounts for 7 / 10 of the reactor capacity. The initial concentration of CAP was 40 mg / L, adding K 2 S 2 o 8 The concentration is 6480 mg / L, and the amount of zero-valent iron powder added is 180 mg. The timing of water intake, feeding, stirring, static settling, drainage and slag discharge is precisely controlled by the time controller. After entering the sewage, add K at the same time 2 S 2 o 8 and zero-valent iron powder, after the addition is completed, start stirring; after stirring for 3 hours, settle for 2.5 days; discharge slag after draining. The effluent results after operation are: the concentration of CAP in sewage is 0 mg / L, the removal rate of CAP is 100%, and the removal rate of TOC in sewage is 89%.

Embodiment 3

[0029] Example 3: In this example, the volume of the improved sequencing batch reactor is 3.0 L, and sewage is fed until the volume accounts for 4 / 5 of the reactor capacity. The initial concentration of CAP was 45 mg / L, adding K 2 S 2 o 8 The concentration is 11250 mg / L, and the amount of zero-valent iron powder added is 200 mg. The timing of water intake, feeding, stirring, static settling, drainage and slag discharge is precisely controlled by the time controller. After entering the sewage, add K at the same time 2 S 2 o 8 and zero-valent iron powder, after the addition is completed, start stirring; after stirring for 4 hours, settle for 3 days; drain and discharge slag. The effluent results after operation are: the concentration of CAP in sewage is 0 mg / L, the removal rate of CAP is 100%, and the removal rate of TOC in sewage is 92%.

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Abstract

The invention belongs to the technical field of environmental friendliness, and in particular relates to a sewage treatment method and a sewage treatment device by taking zero-valent iron powder as a carrier. On the basis that the zero-valent iron powder is taken as the carrier, a proper amount of K2S2O8 is added into a reactor so as to generate SO4<->. to perform oxidative degradation on organic pollutants difficult to degrade in water, so that the problem that the degradation rate of the organic pollutants is low because of ultra-small dispersion distances of HO. in the water in the traditional advanced oxidation process is solved. In an airtight reactor, the time of water feeding, material adding, stirring, standing, water draining and deslagging is accurately controlled by virtue of a time controller, and the mechanical stirring is carried out by virtue of polyethylene (PE) paddles, so that the SO4<->. generated due to a reaction of the iron powder and the K2S2O8 can fully contact the organic pollutants, and thus the up-to-standard discharge of the treated sewage is realized and the secondary pollution is difficult to generate. The device is safe and reliable in running.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a sewage treatment method and device method using zero-valent iron powder as a carrier. Background technique [0002] With the rapid development of my country's economy, many emerging refractory organic pollutants are discharged into water bodies. Many of these pollutants have endocrine disrupting properties, and some are highly toxic and can be enriched in organisms. Therefore, their impact on the environment cannot be ignored, and it is imperative to explore an effective method for removing refractory organic pollutants such as endocrine disruptors with high efficiency and low consumption. [0003] Traditional advanced oxidation processes (AOPs) can generate HO active radicals, which have been proven to remove refractory organic pollutants in sewage (Oh et al., 2002; Watanabe et al., 2003; Chin et al., 2004 ; Neamtu et al., 2006). However, the dis...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J19/18B01F15/00
Inventor 李洪静
Owner FUDAN UNIV
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