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Chromium-containing wastewater treatment process

A treatment process and technology for chromium wastewater, applied in water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of high equipment cost and maintenance cost, occupying a large space, etc., and achieve saving Effects of equipment investment and land occupation, saving treatment costs, and reducing treatment costs

Pending Publication Date: 2021-06-25
湖南新九方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing process needs to use two sets of completely different process equipment when dealing with neutral chromium-containing wastewater and acid chromium-containing wastewater, which will not only cause high equipment costs and maintenance costs, but also occupy a lot of space

Method used

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  • Chromium-containing wastewater treatment process
  • Chromium-containing wastewater treatment process

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Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 Shown, the invention provides a kind of treatment process of chromium-containing waste water, comprises the steps:

[0034] Step 1, introducing the neutral chromium-containing wastewater into the wastewater collection pool;

[0035] Step 2, pH adjustment of the neutral chromium-containing wastewater, the liquid in the wastewater collection tank is pumped into the pH adjustment tank through the lifting pump, and the pH adjustment is performed;

[0036] It should be specifically stated that the pH is adjusted to 2-3, and sulfuric acid is used for pH adjustment.

[0037] Step 3, reduction, introducing the pH-adjusted neutral chromium-containing wastewater into the reduction tank, and adding a reducing agent under acidic conditions to reduce hexavalent chromium to trivalent chromium;

[0038] It should be further explained that the reducing agent is sulfite.

[0039] Step 4. Call back the precipitation, introduce the reduced wastewater into the flocculation ...

Embodiment 2

[0045] recombine figure 2 Shown, the present invention also provides a kind of processing technology of chromium-containing waste water, comprises the steps:

[0046] Step 1, introducing acidic chromium-containing wastewater into the wastewater collection pool;

[0047] Step 2: Set the overrunning pipe to directly pump the liquid in the wastewater collection tank into the flocculation reaction tank by the lift pump;

[0048] Step 3, trapping, using a heavy metal trapping agent in the flocculation reaction tank to directly trap the acidic chromium-containing wastewater to generate chelated chromium salts;

[0049] Step 4. Sedimentation. The captured wastewater is introduced into the inclined tube settling tank, and the formed sediment settles in the inclined tube settling tank. The effluent enters the intermediate pool at the front end of the multi-media filter, and the settled sludge is regularly discharged into high-density sludge. concentration pool;

[0050] It should b...

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PUM

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Abstract

The invention discloses a process for treating chromium-containing wastewater. The process comprises the following steps: step 1, introducing neutral chromium-containing wastewater or acidic chromium-containing wastewater into a wastewater collecting tank; step 2, adjusting the pH value; step 3, performing reduction or trapping; step 4, performing callback precipitation or direct precipitation; step 5, treating supernatant liquid in a sedimentation tank; and step 6, treating lower-layer sludge in the sedimentation tank. The process has the following advantages: the treatment of neutral chromium-containing wastewater and acidic chromium-containing wastewater can be realized by one set of process, and only a little difference exists in the aspects of chemical type addition and pH adjustment; the same set of process system is adopted, so that equipment investment and land occupation are saved; and the acidic chromium-containing wastewater is directly treated under the acidic condition, and the effluent is directly recycled, so that the treatment cost of acid-base neutralization is reduced, and meanwhile, when the effluent is used for follow-up leaching, only a part of acidic agent needs to be supplemented, and a part of treatment cost can be saved.

Description

【Technical field】 [0001] The invention relates to the technical field of chromium-containing wastewater treatment, in particular to a treatment process for chromium-containing wastewater. 【Background technique】 [0002] When leaching contaminated soil, due to the large changes in soil pollution components and concentrations, it is necessary to adopt a targeted leaching plan to ensure the treatment effect and optimize the treatment cost. Generally, pickling is required for high-concentration polluted soil; water-washing is sufficient for low-concentration polluted soil, so there will be situations where different eluents need to be treated. The current existing process needs to use two sets of completely different process equipment when treating neutral chromium-containing wastewater and acid chromium-containing wastewater, which not only causes high equipment cost and maintenance cost, but also takes up a lot of space. 【Content of invention】 [0003] The object of the pre...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F11/122C02F101/22
CPCC02F9/00C02F11/122C02F2101/22C02F1/66C02F1/70C02F1/52C02F1/5209
Inventor 杨添奇肖潇徐巍成一知纪智慧王承刚朱海泉
Owner 湖南新九方科技有限公司