Treatment method for electroplating wastewater and sludge

A technology of electroplating wastewater and treatment methods, applied in water/sludge/sewage treatment, water/sewage treatment, metallurgical wastewater treatment, etc., can solve problems such as capacity expansion, poor selectivity, and clogging of permeable membranes, and achieve reduced disposal Effect

Inactive Publication Date: 2020-04-17
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most commonly used method is the chemical precipitation method, but a large amount of sludge containing heavy metals and organic matter will be produced during the reaction process, and the heavy metals will be transferred from the wastewater to the sludge, causing secondary pollution
Although the commonly used ion exchange method has strong selectivity of ion exchange resin, the manufacture of ion exchange resin is complicated, the cost is high, the consumption of regenerant is large, and the operation and management level is high. Organic substances such as organic substances, which will cause greater pollution to the resin, and the waste water cannot be discharged up to the standard without subsequent treatment
Adsorption treatment method, the price of the adsorbent is relatively expensive, and the adsorbent needs to be regenerated and the secondary pollution is large, which restricts the wide application of adsorption technology
In the current electroplating wastewater treatment, the reverse osmosis method can recover the electroplating solution, thereby achieving better economic benefits; but the osmotic membrane used in the reverse osmosis method is delicate, and the solutes and suspended solids in the electroplating wastewater are complicated, and most of them are acidic or Alkaline, it is easy to cause blockage and damage of the permeable membrane, resulting in a waste of social wealth
[0004] Because the chemical precipitation method is commonly used in the treatment of electroplating wastewater, a large amount of electroplating sludge will be produced. The electroplating sludge mainly adopts the following three treatment methods: one is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The electroplating cleaning wastewater and electroplating sludge of an electroplating factory, the solid content of the wastewater is about 3%, the COD is about 4500mg / L, and it is strongly acidic; the sludge is mainly composed of physical and chemical sludge and a small amount of biochemical sludge, and the average moisture content of the sludge is It is 65% (by mass).

[0033] After the waste water is concentrated twice, the waste water and sludge are taken for beating, and the solid content of the sample is 8%. Add a certain amount of cellulose waste liquid to the sludge beating liquid, stir evenly, filter out a little mechanical impurities, and test the supernatant of the mixed liquid COD is about 115000mg / L, TOC is about 45000mg / L, and the total content of metal elements (iron, copper, manganese) is about 210mg / L through ICP test, and the pH of the mixture is adjusted to 3.8 for later use.

[0034] The above mixture was transferred into a microwave reactor, and the...

Embodiment 2

[0038]The electroplating cleaning wastewater and electroplating sludge of an electroplating factory, the solid content of the wastewater is about 3.7%, the COD is about 6800mg / L, and it is strongly acidic; the sludge is mainly composed of physical and chemical sludge and a small amount of biochemical sludge, and the average moisture content of the sludge is It is 71% (by mass).

[0039] After the waste water is concentrated twice, the waste water and sludge are taken for beating, and the solid content of the sample is 9.2%. Add a certain amount of cellulose waste liquid to the sludge beating liquid, stir evenly, filter out a little mechanical impurities, and test the supernatant of the mixed liquid COD is about 162000mg / L, TOC is about 57000mg / L, and the total content of metal elements (iron, copper, manganese) is about 980mg / L through ICP test. The pH of the mixture is adjusted to 4.0 for later use.

[0040] The above mixture was transferred into a microwave reactor, and the ...

Embodiment 3

[0044] The electroplating cleaning wastewater and electroplating sludge of an electroplating factory, the solid content of the wastewater is about 2.8%, the COD is about 11000mg / L, and it is strongly acidic; the sludge is mainly composed of physical and chemical sludge and a small amount of biochemical sludge, and the average moisture content of the sludge is It is 80% (by mass).

[0045] After the waste water is concentrated twice, the waste water and sludge are taken for beating, and the solid content of the sample is 6.5%. Add a certain amount of glucose waste liquid to the sludge beating liquid, stir evenly, filter out a little mechanical impurities, and test the COD of the supernatant of the mixed liquid About 151000mg / L, TOC about 48000mg / L, the total content of metal elements (iron, copper, manganese) is about 1150mg / L through ICP test, and the pH of the mixture is adjusted to 4.5 for later use.

[0046] The above mixture was transferred to a microwave reactor, and the ...

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Abstract

The invention discloses a treatment method for electroplating wastewater and sludge. The treatment method comprises the following steps: (1) evaporating and concentrating electroplating wastewater, discharging condensed water or recycling the condensed water to an electroplating process, and mixing and slurrying the concentrated solution, electroplating sludge and a carbon source; (2) carrying outmicrowave hydrothermal treatment on slurry under the conditions that a temperature is 130-250 DEG C and a pressure is 2-10 MPa so as to allow a carbon source and metal elements in the slurry to reactin situ to generate a carbon-based catalyst; (3) introducing an oxidant, carrying out catalytic wet oxidation on the slurry having undergone hydro-thermal treatment, carrying out solid-liquid separation after the reaction is finished, carrying out drying treatment on a solid phase, and recycling the treated solid phase as a catalyst; and (4) carrying out electric flocculation on a filtrate obtained by solid-liquid separation, wherein solid slag of electric flocculation is partially recycled to the electroplating sludge. According to the method, deep harmless and reduction treatment of the electroplating wastewater and the electroplating sludge is realized, and meanwhile, the recyclable catalyst for wet oxidation wastewater treatment is obtained through resource utilization.

Description

technical field [0001] The invention relates to the field of wastewater and sludge treatment, in particular to a treatment method for electroplating wastewater and sludge. Background technique [0002] The composition of wastewater produced in electroplating production is very complex, except for cyanide (CN - ) and acid and alkali, heavy metals are potentially extremely harmful sewage categories in the electroplating industry, and these substances seriously endanger the environment and human health. The main sources of electroplating wastewater are: (1) Plating parts cleaning water (the main source of wastewater). In addition to containing heavy metal ions, the waste water also contains a small amount of organic matter, which is relatively low in quantity but relatively large in quantity; (2) the discharge of plating solution filtering flushing water and waste plating solution. The amount of this part of wastewater is not large, but the content is high and the pollution i...

Claims

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Application Information

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IPC IPC(8): C02F9/08B01J23/889B01J37/10B01J37/34C02F101/20C02F103/16C02F101/30
CPCB01J23/8892B01J37/10B01J37/346C02F1/04C02F1/302C02F1/463C02F1/725C02F9/00C02F2101/20C02F2101/30C02F2103/16
Inventor 毛兵江海云王安龙王栋陶海祥简卫
Owner ZHEJIANG QICAI ECO TECH CO LTD
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