Casting wastewater purification treatment method

A treatment method and wastewater purification technology, which is applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low wastewater filtration efficiency, reduce consumption time, reduce costs, and prevent stuck Effect

Pending Publication Date: 2021-01-01
山东天智信息科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for purifying casting wastewater. By adding a rotary crushing mechanism, the agglomerates contained in the wastewater are broken and then filtered to pre

Method used

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  • Casting wastewater purification treatment method
  • Casting wastewater purification treatment method
  • Casting wastewater purification treatment method

Examples

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Example Embodiment

[0049]Example 1:

[0050]A method for purifying and treating foundry wastewater includes the following steps:

[0051]S1, agglomeration and crushing: crushing agglomerates such as rust contained in foundry wastewater;

[0052]S2, filtration and adsorption: filter the larger particles contained in the foundry wastewater, and further adsorb the fine particles after filtration;

[0053]S3. Purification of organic matter: adjust the pH value of wastewater after flocculation and sedimentation to 3, add hydrogen peroxide and add ferrous sulfate to make H2O2The molar ratio to Fe2+ is 4:1, and Fenton oxidation treatment is carried out for the organic matter that is difficult to handle;

[0054]S4. Wastewater neutralization: add slaked lime to the treated wastewater in S4 to adjust the pH value of the wastewater to 7;

[0055]S5. Wastewater disinfection: disinfection of waste water through disinfectant, so that the treated waste water reaches the discharge standard, so that the waste water can be recycled aga...

Example Embodiment

[0068]Example 2:

[0069]S1. After the agglomeration treatment, impurity sedimentation: add 1% of the total mass of the waste water to the wastewater and then stir, the stirring speed is 220 / min, and the flocculation reaction time is 3 minutes;

[0070]S2, organic matter purification: adjust the pH value of wastewater after flocculation and precipitation to 5, add hydrogen peroxide and add ferrous sulfate to make H2O2The molar ratio to Fe2+ is 2:3, and Fenton oxidation treatment is performed on the organic matter that is difficult to handle;

[0071]S3. Wastewater neutralization: add slaked lime to the treated wastewater in S4 to adjust the pH value of the wastewater to 8;

[0072]S4. Wastewater disinfection: using ozone to sterilize wastewater, so that the treated wastewater can meet the discharge standard, so that the wastewater can be recycled again;

[0073]The above-mentioned casting wastewater purification treatment method S1 involves a casting wastewater filtration and sedimentation treatme...

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Abstract

The invention discloses a casting wastewater purification treatment method, which comprises the steps of caking and crushing, filtration and adsorption, impurity sedimentation, organic matter purification, wastewater neutralization and wastewater disinfection, and further designs a casting wastewater filtration and sedimentation treatment device. According to the method disclosed in the invention,the rotary crushing mechanism is additionally arranged to crush agglomerates contained in the wastewater; the filter screen can keep normal filtering work by adding the coagulant and then filtering,and therefore the situation that the wastewater filtering efficiency is reduced due to the fact that the filter screen is blocked by large cakes can be effectively prevented; when the coagulant is added, impurities in the wastewater are rapidly flocculated by optimizing the wastewater treatment method by stirring of the stirring roller; after 3-5 minutes, the separated water can flow out, and theflocculation at the lower layer is choked under the combined action of the precipitation choked flow plate and the choked flow brush, so that the time consumed in the flocculation reaction and gravitysedimentation process can be reduced, and the purification efficiency of the wastewater is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for purifying casting wastewater. Background technique [0002] Most of the wastewater produced by the foundry is the cooling wastewater of the iron furnace, which contains sediment, rust agglomerates and other substances. After searching the patent publication number CN108996748A, a new type of wastewater treatment device for the foundry industry, including the treatment device body, the treatment device One end of the body is provided with a filter tank, and a water inlet is provided above one side of the filter tank, and the other side of the filter tank is connected to a flocculation sedimentation tank through a pipeline, and a filter bag is installed inside the filter tank, and one end of the flocculation sedimentation tank Adsorption tanks are connected through pipelines; patent publication number CN108996823A is retrieved, a casting st...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F2303/26C02F1/281C02F1/28C02F1/66C02F1/725C02F1/722C02F2305/026C02F2303/04C02F1/50C02F1/52C02F2103/16
Inventor 张桂娟
Owner 山东天智信息科技有限公司
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