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Treatment method of gold smelting plant high-salt wastewater hard to treat and containing ammonia and nitrogen

A treatment method and difficult-to-treat technology, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage multi-stage treatment, etc., can solve the problems of reducing the diffusion coefficient of oxidant and the treatment effect, so as to avoid complicated operating conditions and reduce Investment and processing cost, low energy consumption effect

Active Publication Date: 2015-03-25
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the presence of high salinity increases the osmotic pressure and viscosity of wastewater and reduces the diffusion coefficient of oxidants in wastewater; on the other hand, wastewater contains stable metal complexes, which cannot be controlled by the oxidation potential of conventional oxidants. Direct decomposition is the main reason why this kind of wastewater is difficult to treat
[0003] The original treatment process of a gold smelting plant is "alkali neutralization + copper sulfide precipitation + ammonia nitrogen removal by alkali chlorine method". The treatment effect continues to decline, and at the same time, a large amount of waste gas, waste residue and other secondary pollution are generated

Method used

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  • Treatment method of gold smelting plant high-salt wastewater hard to treat and containing ammonia and nitrogen

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Experimental program
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Effect test

Embodiment 1

[0033] After the waste water of each technological process is mixed, the water quality situation of the waste water to be treated is as follows: TDS=8.5wt%, [NH 3 -N]=8000mg·L -1 , [M n+ ]=230mg·L -1 ([M n+ ] is the total concentration of all heavy metals), [Ca 2+ ]=1200mg·L -1 ,COD=220mg·L -1 , pH=2.5.

[0034] Implementation steps:

[0035] (1) Adding Na to the above wastewater 2 CO 3 and Rhodococcus erythropolis microbial flocculant NOC-1, the dosage is 2000mg·L respectively -1 with 100mg·L -1 . After stirring and reacting for 0.5h, stand still and filter, and incinerate the obtained filter residue to realize sludge reduction and then landfill, and the filtrate and supernatant are mixed and pumped into the softening tank.

[0036] (2) Calculate according to the water quality and add a certain amount of sodium carbonate and sodium hydroxide in proportion to the softening tank, adjust the pH = 11.5, stir and react for 0.5h, then let stand, settle, filter, mix the ...

Embodiment 2

[0041] After the waste water of each technical process is mixed, the water quality situation of the waste water to be treated is as follows: TDS=10.2wt%, [NH 3 -N]=6000mg·L -1 , [M n+ ]=200mg·L -1 ([M n+ ] is the total concentration of all heavy metals), [Ca 2+ ]=1100mg·L -1 ,COD=375mg·L -1 ,pH=3.5

[0042] Implementation steps:

[0043] (1) Adding Na to the above wastewater 2 CO 3 and Rhodococcus erythropolis microbial flocculant NOC-1, the dosage is 3000mg·L respectively -1 with 150mg·L -1 . After stirring and reacting for 1 hour, stand still and filter, and incinerate the obtained filter residue to realize sludge reduction, and then landfill it. The filtrate and supernatant are mixed and pumped into the softening tank.

[0044] (2) Calculate according to the water quality and add a certain amount of sodium carbonate and sodium hydroxide in proportion to the softening tank, adjust the pH = 11.5, stir and react for 0.5h, then let stand, settle, filter, mix the fil...

Embodiment 3

[0049] After the waste water of each technical process is mixed, the water quality situation of the waste water to be treated is as follows: TDS=12.3wt%, [NH 3 -N]=5000mg·L -1 , [M n+ ]=180mg·L -1 ([M n+ ] is the total concentration of all heavy metals), [Ca 2+ ]=1200mg·L -1 ,COD=500mg·L -1 ,pH=4.0

[0050] Implementation steps:

[0051] (1) Adding Na to the above wastewater 2 CO 3 and Rhodococcus microbial flocculant NOC-1, the dosage is 4000mg L -1 with 200mg·L -1 . Stirring and reacting for 1.5 hours, let it stand still, filter, incinerate the obtained filter residue to realize sludge reduction, and then landfill it. The filtrate and supernatant are mixed and pumped into the softening tank.

[0052] (2) Calculate according to the water quality and add a certain amount of sodium carbonate and sodium hydroxide in proportion to the softening tank, adjust the pH = 11.5, stir and react for 0.5h, then let stand, settle, filter, mix the filtrate and the supernatant and...

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Abstract

The invention discloses a treatment method of gold smelting plant high-salt wastewater hard to biodegrade and containing ammonia and nitrogen. According to the method, technological procedures such as desalting pretreatment, two-stage separated evaporation and biochemical treatment are mainly adopted. By adopting mature and reliable technologies, the technological process is safe, efficient, free of secondary pollution, capable of recycling valuable materials and comprehensively utilizing resources, and controllable in cost; the quality of treated water reaches the first-class emission standard and the water recycle standard. By combining a plurality of treatment technologies, the treatment method disclosed by the invention has the advantages of achieving a remarkable benefit increment effect, breaking through the technical bottlenecks of the original treatment process and the existing treatment method, effectively solving the problem of hard degradation of high-salt complex wastewater and creating good environmental protection and economic benefits.

Description

technical field [0001] The invention relates to a treatment method for gold smelter wastewater containing high salt, ammonia nitrogen and refractory to biodegradation, and belongs to the field of environmental protection water treatment. Background technique [0002] During the desorption, electrowinning, and purification processes of gold refining, difficult-to-treat wastewater is produced, characterized by high salinity, complex pollutant components, and almost zero direct biodegradability. The industrial wastewater discharge standard requires water reuse rate ≥ 80%, the salinity continuously accumulates during the recycling process, and its salt content TDS is more than or equal to 8wt%. On the one hand, the existence of high salinity increases the osmotic pressure and viscosity of wastewater, and reduces the diffusion coefficient of oxidants in wastewater; on the other hand, wastewater contains stable metal complexes, which cannot be controlled by the oxidation potential...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/16
Inventor 陈启斌黄怀国杨寿先张卿季常青叶志勇郭金溢
Owner 厦门紫金矿冶技术有限公司
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