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Electrochemical reinforced zero-valent iron waste water pretreatment system and method

A treatment system and technology of zero-valent iron, applied in electrochemical water/sewage treatment, chemical instruments and methods, magnetic/electric field water/sewage treatment, etc. It can improve the sludge activity and sedimentation, promote aggregation and sedimentation, and facilitate flexible operation and maintenance.

Inactive Publication Date: 2018-02-27
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, zero-valent iron has broad application prospects as pretreatment of refractory organic wastewater, but in the actual application process, there are also the following problems: ①Slow reaction rate, long residence time, and the surface of zero-valent iron is easy to produce " Concentration polarization", resulting in low reaction efficiency of the system; ②The reduction reaction rate of zero-valent iron is difficult to control, and the utilization efficiency is low, which has great application limitations; ③The zero-valent iron filler layer is easy to harden and passivate, resulting in unstable wastewater effluent

Method used

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  • Electrochemical reinforced zero-valent iron waste water pretreatment system and method
  • Electrochemical reinforced zero-valent iron waste water pretreatment system and method
  • Electrochemical reinforced zero-valent iron waste water pretreatment system and method

Examples

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Embodiment 1

[0027] The amount of pharmaceutical wastewater produced by a pharmaceutical company in Zhejiang Province is about 80m3 / h, the COD of wastewater is 808-1031mg / L, and the NH 4 + -N is 50~60mg / L, the company's raw sewage treatment system is anaerobic hydrolytic acidification +A 2 / O process, but the operation stability of the device is poor, and the effluent water quality fluctuates greatly; the analysis shows that the BOD of the raw wastewater is between 180 and 243 mg / L, and the B / C is less than 0.25, that is, the biodegradability of the wastewater is poor, and Wastewater contains a large amount of refractory substances and toxic and harmful substances, such as chlorinated hydrocarbons, chlorinated aromatics and organic chlorine fungicides, etc., resulting in low sludge activity and poor settleability. Currently, the process effluent COD is 123-230mg / L, BOD is 22-41mg / L, NH 4 + -N is 23~38mg / L, SS is 53~91mg / L, the company plans to upgrade the existing process to meet the ac...

Embodiment 2

[0030] The wastewater volume of a coking plant in Inner Mongolia is about 200m 3 / h, at present, the anaerobic hydrolysis acidification + oxidation ditch treatment process is used for wastewater treatment, but because the wastewater contains a large amount of refractory and toxic and harmful substances such as phenols and benzene, the biodegradability of the wastewater is poor, and the process treatment is unstable , The effluent water quality fluctuates greatly, and the company plans to upgrade the process to improve system stability. Using the electrochemically enhanced zero-valent iron wastewater pretreatment system of the present invention to carry out a small-scale test on the coking plant wastewater, the treatment capacity of the small-scale test device is about 20L / h, wherein the columnar The distance between the graphite cathode 501 and the cylindrical titanium anode 502 is 30 cm, the particle size of the active zero-valent iron particles 510 is about 2.2 cm, the layer...

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Abstract

The invention discloses an electrochemical reinforced zero-valent iron waste water pretreatment system, which comprises a waste water collecting pool (1), a lifting pump (2), a reinforced zero-valentiron treatment system (3) and a direct current voltage stabilizing power supply system (4), wherein the reinforced zero-valent iron treatment system (3) consists of a plurality of tubular electric reinforced zero-valent iron reaction posts (5) which are connected in series or in parallel. The invention also discloses a pretreatment method. Waste water in the waste water collecting pool (1) is pumped into the reinforced zero-valent iron treatment system (3); the direct current voltage stabilizing power supply system (4) provides loaded voltage and current for the reinforced zero-valent iron treatment system (3); under the condition of the additionally added direct current electricity, the weak electric field is formed in the tubular electric reinforced zero-valent iron reaction posts (5) soas to promote the accelerated catalysis reduction of difficult-to-degrade organic matter in the waste water by active zero-valent iron particles (510); the toxicity of the waste water is obviously reduced or the biodegradability of the waste water is improved; the discharged water enters the subsequent process to be further treated.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a wastewater pretreatment technology, in particular to an electrochemically enhanced zero-valent iron wastewater pretreatment system and method. Background technique [0002] A large amount of industrial wastewater is produced in the process of industrial production. This type of wastewater is not only produced in a large amount, but also because of the processing of industrial products, the wastewater often contains a large amount of artificially synthesized toxic, harmful and refractory substances, resulting in poor biodegradability of the wastewater. If the traditional biochemical There are many problems, such as low wastewater treatment efficiency, unstable system operation, and large fluctuations in effluent quality. Therefore, the front-end of industrial wastewater treatment generally adopts a pretreatment system, such as a pre-aeration system, anaerobic hydrolysis acidifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/48C02F1/70
CPCC02F1/46C02F1/48C02F1/705C02F2301/08
Inventor 钱光磊谢陈鑫滕厚开赵慧秦微王震李旗任春燕周立山张艳芳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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