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Pretreatment method for chemical industry wastewater

A chemical wastewater pretreatment technology, applied in high salt, high ammonia nitrogen, highly toxic chemical wastewater pretreatment, high organic solvent field, can solve the complex composition of chemical wastewater, biochemical treatment inhibition, increase the load of biochemical system and other problems, to reduce Fine suspended matter, reduce ammonia nitrogen load, and ensure normal operation

Inactive Publication Date: 2016-09-07
安徽南风环境工程技术有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The evaporator is used to remove the salt and some organic solvents in the chemical wastewater, the micro-electrolysis reactor-Fenton reactor is used to degrade the organic matter in the condensed water discharged from the evaporator, and the coagulation reaction precipitation is used to remove the organic matter in the water Suspended solids, the following problems often occur in the actual operation of the conventional process, which makes the system unable to operate normally:
[0003] 1. The composition of chemical wastewater is complex, containing a variety of complex low-boiling organic solvents, and the foam problem is serious during the evaporation process, which seriously affects the normal operation of the evaporator;
[0004] 2. After this type of chemical wastewater is desalted by a steamer, and the condensed water passes through micro-electrolysis, Fenton reactor, coagulation reaction precipitation and other treatment units, the amount of total salt in the wastewater will increase, and the increase is generally related to the amount of dosing In actual operation, the increased amount of total salt in the wastewater will inhibit the subsequent biochemical treatment;
[0005] 3. After the waste water is treated by the evaporator, the low-boiling organic matter in the condensed water has complex components and high content of organic nitrogen. After the micro-electrolysis, Fenton reactor, coagulation reaction precipitation and other treatment units, the ammonia nitrogen and total nitrogen in the waste water The content will increase, increasing the subsequent biochemical system load

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  • Pretreatment method for chemical industry wastewater
  • Pretreatment method for chemical industry wastewater
  • Pretreatment method for chemical industry wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Select high-salt, high-ammonia-nitrogen, high-organic-solvent, and highly-toxic chemical wastewater to undergo coagulation reaction precipitation treatment, micro-electrolysis reaction treatment, Fenton reaction treatment, MVR evaporation treatment, and condensate biochemical treatment in sequence;

[0031] Wherein said coagulation reaction precipitation process adopts PAC as coagulant, and PAM is as coagulant aid, and described PAC dosage is 98mg / L, and described PAM dosage is 11mg / L, and the described coagulation reaction precipitation The pH value is controlled at 6 by sulfuric acid adjustment;

[0032] Control the pH value at 2.8 during the micro-electrolysis reaction process;

[0033] H during the Fenton reaction process2 o 2 Dosage 9g / L, FeSO 4 The dosage is 180g / L, the dosage of PAM is 4mg / L, and the pH value is adjusted and controlled at 2.8 by sulfuric acid;

[0034] The pH value is controlled at 5 during the MVR evaporation process.

Embodiment 2

[0036] This embodiment is the same as the pretreatment method of embodiment 1, but the corresponding process parameters have been adjusted, specifically:

[0037] Wherein the dosage of PAC in the coagulation reaction precipitation treatment is 102mg / L, the dosage of PAM is 9mg / L, and the pH value of the coagulation reaction precipitation is controlled at 9 by sulfuric acid adjustment;

[0038] Control the pH value at 3.2 during the micro-electrolysis reaction process;

[0039] H during the Fenton reaction process 2 o 2 Dosage 10g / L, FeSO 4 The dosage is 220g / L, the dosage of PAM is 6mg / L, and the pH value is adjusted and controlled at 3.2 by sulfuric acid;

[0040] The pH value is controlled at 6 during the MVR evaporation process.

Embodiment 3

[0042] This embodiment is the same as the pretreatment method of embodiment 1, but the corresponding process parameters have been adjusted, specifically:

[0043] Wherein the dosage of PAC in the coagulation reaction precipitation treatment is 100mg / L, the dosage of PAM is 10mg / L, and the pH value of the coagulation reaction precipitation is controlled at 7 by sulfuric acid adjustment;

[0044] Control the pH value at 3 during the micro-electrolysis reaction process;

[0045] H during the Fenton reaction process 2 o 2 Dosage 9.6g / L, FeSO 4 The dosage is 200g / L, the dosage of PAM is 5mg / L, and the pH value is adjusted and controlled at 3 by sulfuric acid;

[0046] The pH value is controlled at 5.5 during the MVR evaporation process.

[0047] The pretreatment method of the present invention was used for the first time in a chemical wastewater treatment project of a listed company in Lai'an County. Before the application of the pretreatment method in production, it was succes...

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Abstract

The invention relates to a pretreatment method for chemical industry wastewater with high salt, high ammonia nitrogen, high organic solvent and high toxicity. According to the technical scheme, the chemical industry wastewater is subjected to coagulating reaction sedimentation treatment, microelectrolysis reaction treatment, Fenton reaction treatment and MVR evaporation treatment in sequence. By means of the pretreatment method, the content of fine suspended matter and low-boiling-point organic matter in the chemical industry wastewater can be effectively reduced, the phenomenon that foam is formed in the operation process of an MVR evaporator is reduced, and thus normal operation of the MVR evaporator is guaranteed; as the chemical industry wastewater is subjected to microelectrolysis reaction treatment and Fenton reaction treatment, organic nitrogen can be converted into ammonia nitrogen before the chemical industry wastewater is subjected to MVR evaporation treatment, the existing form of nitrogen in the wastewater is controlled, most ammonia nitrogen is crystallized out of the system in the form of ammonium chloride, and thus the ammonia nitrogen load in subsequent condensate biochemical treatment is reduced. Compared with a conventional treatment process, the pretreatment method has an unexpected treatment effect on the chemical industry wastewater, and the operation stability of the whole system is guaranteed.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a pretreatment method for high-salt, high-ammonia nitrogen, high-organic solvent, and high-toxicity chemical wastewater. Background technique [0002] Conventionally, for the "high salt, high ammonia nitrogen, high organic solvent, high toxicity" chemical wastewater, it is generally firstly evaporated to remove salt and remove organic solvents, and then add "micro-electrolysis or Fenton oxidation" according to the characteristics of the discharged condensed water. Unit, the specific process flow is: chemical wastewater - evaporator - micro electrolysis reactor - Fenton reactor - coagulation precipitation reaction - biochemical treatment of supernatant. The evaporator is used to remove the salt and some organic solvents in the chemical wastewater, the micro-electrolysis reactor-Fenton reactor is used to degrade the organic matter in the condensed water disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F1/461C02F1/46104C02F1/5236C02F1/56C02F1/72
Inventor 韩厚强吴冬胜肖中新杨圣广邹润菊
Owner 安徽南风环境工程技术有限公司
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