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Treatment process for chromium-containing sewage

A treatment process and technology for chromic sewage, applied in water/sewage treatment, biological water/sewage treatment, heating water/sewage treatment, etc., which can solve the problems of high operating cost, high power consumption by electrolytic treatment, and complicated activated carbon regeneration operation. , to achieve the effect of strong purification and treatment capacity, high recycling rate and high removal rate of chromium from sewage.

Active Publication Date: 2018-05-22
万嘉清水(厦门)环境技术有限公司
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Problems solved by technology

The ion exchange method can recover valuable heavy metals while treating wastewater, but the disadvantage is high operating costs
Activated carbon treatment method is easy to obtain materials and low investment, but the regeneration operation of activated carbon is complicated, and the regenerated eluent cannot be directly returned to the plating tank for use
The electrolytic treatment method consumes a lot of electricity, consumes a large amount of iron plates, and has a lot of sludge
The reverse osmosis treatment method relies on the development of a new type of anti-oxidation semi-permeable membrane, which currently does not meet the needs of membranes and equipment; the removal of hexavalent chromium in water has always been one of the hotspots and difficulties in water treatment research, and there are many ways to remove hexavalent chromium , but each method has its own limitations, and the removal rate of chromium in wastewater is low

Method used

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  • Treatment process for chromium-containing sewage
  • Treatment process for chromium-containing sewage

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Embodiment Construction

[0035] refer to Figure 1 to Figure 2 The treatment process of chromium-containing sewage is further explained.

[0036] A treatment process for chromium-containing sewage, such as figure 1 with figure 2 shown, including the following steps:

[0037] S1. Sewage collection: collect the externally received chromium-containing sewage into the waste liquid storage tank 1, and add zeolite, apatite, bentonite, kaolin, diatomite, perlite or layered waste liquid into the waste liquid storage tank 1 Any one or more of double metal hydroxides. After static precipitation, the scum in the upper layer of the waste liquid storage tank 1 is collected and processed, and the sewage in the lower layer of the waste liquid storage tank 1 is passed into the Fenton reaction tank 2 .

[0038] S2. Coagulation and sedimentation: first add PAC:PAM with a ratio of 12:3, and perform primary flocculation and sedimentation in advance. Secondly, Fenton reagent is added into the Fenton reaction tank 2 fo...

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Abstract

The invention discloses a treatment process for chromium-containing sewage. The treatment process comprises the following steps: sewage collection, coagulation and sedimentation, acidification treatment, neutralization and sedimentation, evaporation treatment, biological treatment as well as washing and filtration. The treatment process is high in sewage chromium removal rate, suitable for treating various chromium-containing sewage, high in recycling rate, strong in purification treatment capacity and capable of realizing centralized treatment, increasing the chromium removal rate and improving the COD degradation effect.

Description

technical field [0001] The invention relates to the technical field of industrial sewage treatment, more specifically, it relates to a process for treating chromium-containing sewage. Background technique [0002] Chromium is one of the trace metal elements necessary for organisms and microorganisms, but more than a certain amount of chromium will bring great pressure to human beings and the environment and cause serious harm. It is generally considered that metallic chromium and divalent chromium are non-toxic, trivalent chromium has little toxicity, and hexavalent chromium compounds are the most harmful. Chromium-containing wastewater has attracted the attention of scholars in the industry because of its harmfulness and diverse and complex sources. In view of the harmfulness of chromium, countries all over the world have imposed strict restrictions on the emission form and amount of chromium. Domestic chromium discharge standards are: the upper limit of the concentration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/22
CPCC02F1/001C02F1/04C02F1/441C02F1/66C02F1/70C02F1/72C02F1/722C02F3/1268C02F3/302C02F9/00C02F2001/007C02F2101/22C02F2305/026
Inventor 卢海彬
Owner 万嘉清水(厦门)环境技术有限公司
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