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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 prevent the large agglomerates from clogging the filter screen. The waste water filtration efficiency becomes low. By optimizing the waste water treatment method, when adding coagulant, the impurities in the waste water are quickly formed into flocculation by stirring.

Method used

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  • Casting wastewater purification treatment method

Examples

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Embodiment 1

[0050] A method for purifying foundry wastewater, comprising the following steps:

[0051] S1, agglomeration crushing: squeeze and crush the agglomerates such as rust contained in the 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 the wastewater after flocculation and precipitation to 3, add hydrogen peroxide and add ferrous sulfate at the same time to make the H 2 o 2 The molar ratio to Fe2+ is 4:1, and the organic matter that is difficult to handle is treated with Fenton oxidation;

[0054] S4, waste water neutralization: adding slaked lime to the waste water treated in S4 to adjust the pH value of the waste water to 7;

[0055] S5. Disinfection of waste water: use disinfectant to disinfect the waste water, so that the treated waste water reaches the discharge standard, so ...

Embodiment 2

[0069] S1. After the agglomeration treatment, carry out impurity settlement: add polyferric sulfate accounting for 1% of the total mass of waste water to the waste water and then stir, the stirring speed is 220 / min, and the flocculation reaction time is 3 min;

[0070] S2. Purification of organic matter: adjust the pH value of the wastewater after flocculation and precipitation to 5, add hydrogen peroxide and ferrous sulfate at the same time, so that the H 2 o 2 The molar ratio to Fe2+ is 2:3, and Fenton oxidation treatment is carried out for difficult-to-treat organic matter;

[0071] S3, waste water neutralization: adding slaked lime to the waste water treated in S4 to adjust the pH value of the waste water to 8;

[0072] S4. Disinfection of waste water: use ozone to disinfect the waste water, so that the treated waste water reaches the discharge standard, so that the waste water can be recycled again;

[0073] The casting wastewater filtration and sedimentation treatment ...

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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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