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Water treatment process for corn starch processing wastewater

A technology for processing wastewater and corn starch, which can be used in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc. It can solve problems such as anaerobic sludge poisoning and reduce costs.

Inactive Publication Date: 2021-05-07
肇庆焕发生物科技有限公司
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  • Description
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Problems solved by technology

It is precisely this process that causes the wastewater produced by corn processing starch to contain sulfate or sulfite, and sulfate or sulfite will be reduced to HS and HS under the action of SRB (sulfate reducing bacteria) in an anaerobic environment. H2S can inhibit the activity of anaerobic microorganisms to a certain extent. When the concentration of sulfite is too high, it will directly lead to anaerobic sludge poisoning

Method used

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  • Water treatment process for corn starch processing wastewater

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Embodiment

[0016] A kind of cornstarch processing wastewater water treatment process, such as figure 1 shown, including the following steps:

[0017] Step 1), inject the waste water mixed with sodium bisulfite produced by soaking corn into the storage tank for precipitation, then extract and transport to the filter through the pump body to separate the impurities from the waste water of sodium bisulfite, and obtain corn residue and sodium bisulfite respectively. Sodium bisulfate wastewater;

[0018] Step 2), the sodium bisulfite wastewater filtered in step 1) is input into a primary evaporator for high-temperature treatment, the moisture in the sodium bisulfite wastewater is exported by steam, and then the sodium bisulfite wastewater treated by the primary evaporator is The sodium bisulfate wastewater continues to enter the secondary evaporator, the third evaporator and the fourth evaporator for high-temperature treatment to obtain the concentrated sodium bisulfite solution separated fr...

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Abstract

The invention discloses a water treatment process for corn starch processing wastewater. Wastewater with sodium hydrogen sulfite generated after corn soaking is filtered, impurities are separated out, the wastewater sequentially enters a first-stage evaporator, a second-stage evaporator, a third-stage evaporator and a fourth-stage evaporator, and water evaporation treatment is conducted, so that sodium hydrogen sulfite is separated from the water and a condensed sodium hydrogen sulfite solution is obtained; condensed water obtained by distillation is mixed with concentrated alkali liquor in a stirring tank, and then is mixed with the concentrated sodium hydrogen sulfite solution in a spraying tank for neutralization through spraying, finally treatment is conducted in an aerobic AO treatment pond and discharging is conducted after the standard is met. The technology separates out sodium hydrogen sulfite from water through a physical way, and then the separated water is mixed with alkali liquor for neutralization with sodium hydrogen sulfite, so that not only is the cost of wastewater treatment reduced, but also the wastewater can be used for purification treatment, and the purpose of discharging is achieved.

Description

technical field [0001] The invention belongs to a process for treating cornstarch processing wastewater. Background technique [0002] In the soaking process of corn processing, it is necessary to add sulfurous acid or sodium bisulfite solution for corn soaking. The main function of sulfurous acid or sodium bisulfite in soaking is to break the protein network in corn kernels by breaking the SS bond of protein , so that the wrapped starch granules are released. It is precisely this process that causes the wastewater produced by corn processing starch to contain sulfate or sulfite, and sulfate or sulfite will be reduced to HS and HS under the action of SRB (sulfate reducing bacteria) in an anaerobic environment. H2S can inhibit the activity of anaerobic microorganisms to a certain extent. When the concentration of sulfite is too high, it will directly lead to anaerobic sludge poisoning. Contents of the invention [0003] In view of this, the object of the present invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/10
CPCC02F9/00C02F1/001C02F2001/007C02F1/048C02F1/66C02F3/30C02F3/34C02F3/345C02F2101/101
Inventor 李加雄李建周
Owner 肇庆焕发生物科技有限公司
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