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A coagulation-promoting/conductive composite salt for electrocatalytic wastewater treatment

A wastewater treatment and electrocatalysis technology, applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problem of reducing the electrode-to-wastewater flocculation efficiency and increasing the cost of wastewater electrocatalysis treatment , Reduce the efficiency of electrocatalytic wastewater treatment, etc., to achieve the effect of improving electrochemical flocculation, improving electrochemical or electrocatalytic efficiency, and improving wastewater treatment efficiency

Active Publication Date: 2016-08-17
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical water treatment technology can efficiently remove the "three causes" (carcinogenic, teratogenic, mutagenic) organic pollutants that are difficult to biochemically degrade and are extremely harmful to human health. However, when the conductivity of the wastewater is poor, the electrode is easily polarized and reduced The efficiency of electrocatalytic wastewater treatment also reduces the flocculation efficiency of electrodes to wastewater; especially in the treatment of heavy metal polluted wastewater, there is a certain pressure of excessive electrode consumption, which brings about the increase in the cost of electrocatalytic wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Coagulation-promoting / conducting compound salt formula: 65 parts of sodium chloride; 2 parts of high-molecular composite polymeric iron salt; 5 parts of anionic polyacrylamide (molecular weight: 8 million); 1 part of chitin; 40 parts of sodium carbonate.

[0016] The formula is applied to a traditional electrochemical treatment device to treat urban domestic wastewater, wherein the BOD in urban domestic wastewater is 300mg / L-400mg / L, and the TSS is 200mg / L-400mg / L. An automatic agent adding pump is installed at the water inlet pipe before the wastewater enters the electrochemical treatment system, and the ratio of 5.8g / t is determined according to the experiment to be added to the traditional electrochemical wastewater treatment equipment, and electrolysis is carried out under the electrolysis process conditions of the coagulation-promoting / conducting compound salt. Chemical treatment, BOD at the process outlet is <40mg / L, TSS is <20mg / L, and the removal rate of BOD in w...

Embodiment 2

[0018] Coagulation-promoting / conducting compound salt formula: 46 parts of sodium chloride; 5 parts of polymer composite polymeric iron salt; 8 parts of anionic polyacrylamide (molecular weight: 15 million); 2 parts of chitin; 32 parts of sodium carbonate.

[0019] Apply the formula to a wastewater treatment plant to electrochemically treat high-COD wastewater (where the COD content is as high as 4750mg / L), and install an automatic chemical addition pump at the water inlet pipe before the wastewater enters the electrochemical treatment system, and add coagulation-promoting / conductive compound salts The pump addition ratio is 6.5g / t. After use, the COD removal rate is increased from 66% to 95.6%, the COD of the effluent is 209mg / L, and the COD power consumption is less than 55kwh / kg.

Embodiment 3

[0024] Comparison of power consumption of a certain type of electrocatalytic wastewater treatment device using flocculation / conductive compound salt:

[0025] Flocculation / conductive compound salt formula: 65 parts of sodium chloride; 1 part of polymer composite polymeric iron salt; 5 parts of anionic polyacrylamide (molecular weight: 10 million); 1 part of chitin; 39 parts of sodium carbonate.

[0026] Use this formula to treat 600 tons of domestic sewage. An automatic agent adding pump is installed at the water inlet pipe before the domestic wastewater enters the electrochemical treatment system, the addition ratio of flocculation / conductive compound salt is 6.0g / t, and the average power consumption is 3.8kW / t; the original average power consumption is about 4kW / t , the final cost statistics, saving 0.12 yuan per ton of water than not adding this compound salt, saving 0.23 yuan compared with the traditional electrochemical wastewater treatment method (average power consumpti...

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Abstract

The invention discloses a special coagulation accelerating / conducting compound salt for treating electrical catalytic wastewater. The special coagulation accelerating / conducting compound salt is prepared from sodium chloride, a macromolecular compound polymeric ferric salt, anionic polyacrylamide, chitin and sodium carbonate. In the electrochemical or electrical catalytic treatment process of wastewater such as urban household wastewater, printing and dyeing wastewater, medical wastewater and oilfield wastewater, the coagulation accelerating / conducting compound salt is added, so that the conductivity of the wastewater and the flocculation rate of various polluting components can be increased simultaneously, the electrical catalytic wastewater treatment efficiency is improved, the energy consumption in the electrochemical or electrical catalytic treatment process is greatly reduced, and the coagulation accelerating / conducting compound salt is low in cost of raw materials and convenient to use, and can be widely popularized and used.

Description

technical field [0001] The invention discloses a coagulation-promoting / conductive composite salt special for electrocatalytic wastewater treatment, which belongs to the technical field of sewage treatment. Background technique [0002] Flocculation technology is an economical and simple water quality treatment method commonly used at home and abroad to improve the efficiency of water quality treatment. It is widely used in the treatment of industrial water, industrial wastewater and domestic sewage. In the selection and application of flocculants, most of them are placed on inorganic flocculants and synthetic general polymer flocculants, while there are few researches and applications on composite flocculants. In terms of morphology, degree of polymerization and corresponding coagulation-flocculation effects, inorganic polymer flocculants are still in the position between traditional metal salt coagulants and organic flocculants. Its molecular weight, particle size and floc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C02F1/463
CPCC02F1/463C02F1/5236C02F1/56
Inventor 雷细平李娟王丽娟史学锋李鹏黄国安李顺锋
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD