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System and method for treating rare earth or nonferrous smelting high-salt and high-COD wastewater

A non-ferrous and wastewater technology, applied in water/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of inability to use biochemical methods and high treatment costs

Inactive Publication Date: 2021-07-09
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system and method provided by the present invention solve a series of COD removal problems such as the high salt content and high COD system, which inhibit the survival of biological bacteria and cannot use biochemical methods to remove COD, and the advanced oxidation method has the maximum Recycle water resources as much as possible and reduce operating waste water

Method used

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  • System and method for treating rare earth or nonferrous smelting high-salt and high-COD wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The water quality of rare earth high-salt wastewater in this embodiment: pH: 3-10, COD: 1000mg / L-5000mg / L,

[0030] Salt content 50-200g / L, BOD: about 400-2000mg / L, SS: 100-1000mg / L.

[0031] Adopt the rare earth high-salt wastewater of the present invention to remove COD steps as follows:

[0032] (1) Pretreatment and degreasing: high-salt wastewater enters the pretreatment and degreasing unit to remove insoluble oil in the wastewater. After passing through the pretreatment and degreasing unit, the obtained wastewater enters step (2) for treatment.

[0033] (2) Desalting and deaminization: the effluent described in step (1) is desalted by adding alkali, stripping and rectifying deaminization, and adding calcium hydroxide and carbonic acid at a ratio of calcium and sulfate radicals of 1~5:1. Calcium salt compounded with calcium, calcium chloride, calcium oxide and sodium hydroxide, stirred and reacted for 10-30 minutes, precipitated and filtered, the salt content is 10...

Embodiment 2

[0037] The water quality of colored high-salt wastewater in this implementation: pH: 6-9, COD: 1000mg / L-3000mg / L,

[0038] Salt content 50-100g / L, BOD: about 400-1200mg / L, SS: 100-1000mg / L.

[0039] Adopt colored high-salt wastewater of the present invention to remove COD step as follows:

[0040] (1) Pretreatment and degreasing: high-salt wastewater enters the pretreatment and degreasing unit to remove insoluble oil in the wastewater. After passing through the pretreatment and degreasing unit, the obtained wastewater enters step (2) for treatment.

[0041] (2) Desalting and deaminization: the effluent described in step (1) is desalted by adding alkali stripping and rectifying deaminization, adding calcium hydroxide and carbonic acid at a ratio of calcium and sulfate radicals of 1 to 4:1 Calcium salt compounded with calcium, calcium chloride, calcium oxide and sodium hydroxide, stirred and reacted for 10-30 minutes, precipitated and filtered, the salt content is 10-20g / L, and t...

Embodiment 3

[0045] The water quality of rare earth high-salt wastewater in this embodiment: pH: 5-10, COD: 1000mg / L-2000mg / L,

[0046] Salt content 50-80g / L, BOD: about 400-800mg / L, SS: 100-1000mg / L.

[0047] Adopt the rare earth high-salt wastewater of the present invention to remove COD steps as follows:

[0048] (1) Pretreatment and degreasing: high-salt wastewater enters the pretreatment and degreasing unit to remove insoluble oil in the wastewater. After passing through the pretreatment and degreasing unit, the obtained wastewater enters step (2) for treatment.

[0049] (2) Desalting and deaminization: the effluent described in step (1) is desalted by adding alkali stripping and rectifying deaminization, adding calcium hydroxide and carbonic acid at a ratio of calcium and sulfate radicals of 1~3:1 Calcium salt compounded with calcium, calcium chloride, calcium oxide and sodium hydroxide, stirred and reacted for 10-30 minutes, precipitated and filtered, the salt content is 10-20g / L, ...

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Abstract

The invention relates to a system and a method for treating rare earth or nonferrous smelting high-salt and high-COD wastewater, and belongs to the technical field of industrial high-salt wastewater treatment. The system comprises a pretreatment oil removal unit, a desalination and deamination unit, a sludge microorganism domestication unit, a biochemical treatment unit and an advanced oxidation treatment unit; an outlet of the pretreatment oil removal unit is connected with an inlet of the desalination and deamination unit; an outlet of the desalination and deamination unit and an outlet of the sludge microorganism domestication unit are connected with an inlet of the biochemical treatment unit; an outlet of the biochemical treatment unit is connected with an inlet of the advanced oxidation treatment unit. Through pretreatment oil removal, calcium salt desalination and deamination, sludge microorganism domestication, biochemical treatment and advanced oxidation treatment, on one hand, the salinity of the wastewater is reduced, ammonium is recycled, on the other hand, sludge microorganisms are domesticated, the salt tolerance of the sludge microorganisms is improved, and therefore the high-salt and high-COD wastewater can be treated through a biochemical method; on the basis of biochemical treatment, an advanced oxidation method is adopted for advanced treatment, and finally, the high-salt and high-COD wastewater can be recycled or discharged after reaching the standard.

Description

technical field [0001] The invention belongs to the technical field of industrial high-salt wastewater treatment, and relates to a system and method for treating rare earth or nonferrous smelting high-salt and high-COD wastewater. Background technique [0002] The rare earth or non-ferrous smelting industry is a high-pollution industry, which is usually reflected in high-salt organic pollutant wastewater. This type of wastewater has high salt content (mainly ammonium sulfate, usually as high as 100 g / L or more), and contains a large amount of organic matter (high COD value ). This kind of wastewater has great harm to human body, crop growth, ecological environment, etc., so this kind of wastewater can neither be discharged nor reused, which brings great troubles to various enterprises. Therefore, new methods are urgently needed to solve the problem of the treatment and discharge of such wastewater. At present, the main methods for treating high-salt and high-COD wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/30C02F103/16
CPCC02F9/00C02F1/40C02F1/04C02F1/20C02F1/586C02F1/66C02F1/78C02F3/12C02F2101/16C02F2101/30C02F2103/16
Inventor 张盈李志强李金涛
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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