Low-concentration refractory chemical wastewater treatment method and system

A technology for chemical wastewater and treatment methods, which is applied in the fields of special compound water treatment, oxidized water/sewage treatment, water/sewage treatment, etc. It can improve the effect of catalytic oxidation, ensure the effect of biochemical treatment, reduce sludge loss and process area.

Pending Publication Date: 2020-10-13
北京新林环境科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the treatment processes have the following problems: 1) The series treatment process only combines physicochemical and biochemical machinery, and does not give full play to the comprehensive treatment effect of the treatment system, such as electrocoagulation precipitation-anaerobic-aerobic, resin adsorption-anaerobic- Aerobic, ozone-biological activated carbon-aerobic, photocatalytic oxidation-micro-electrolysis-SBR, etc.; 2) The existing process has problems of blockage, sludge bulking, sludge loss, and long system start-up period; 3) Existing process treatment The effect is difficult to meet the first-level standard of "Integrated Wastewater Discharge Standard" (GB 8978-1996)

Method used

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  • Low-concentration refractory chemical wastewater treatment method and system
  • Low-concentration refractory chemical wastewater treatment method and system
  • Low-concentration refractory chemical wastewater treatment method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Production wastewater of a chemical company in Hebei, water volume 60m 3 / h, the main pollutants are production raw materials and reaction intermediates, specifically benzene ring substances, which are treated by the following process:

[0049] Process 1: The method of the present invention ("Water collection adjustment + heterogeneous catalytic oxidation + biosorption oxidation separation + magnetic coagulation precipitation")

[0050] Process 2: Water collection adjustment + ozone catalytic oxidation + SBR + coagulation sedimentation

[0051] Process 3: Water collection regulation + Fenton + AAO + coagulation and sedimentation

[0052] The effect of the treatment process is as follows in Table 1

[0053]

[0054] According to the above experimental results, when the influent COD is 1500mg / L, BOD is 200mg / L, ammonia nitrogen is 50mg / L, and TP is 5mg / L, the effluent can reach COD≤300mg / L and BOD≤ 70mg / L, ammonia nitrogen≤20mg / L, TP≤0.5mg / L, the removal rates reach...

Embodiment 2

[0056] Production wastewater of a chemical company in Gansu, water volume 150m 3 / h, the main pollutants are production raw materials and reaction intermediates, specifically organic synthetic polymer compounds, which are carried out by the process of the present invention ("water collection adjustment + heterogeneous catalytic oxidation + biological adsorption oxidation separation + magnetic coagulation precipitation") Treatment, influent COD 800mg / L, BOD 100mg / L, ammonia nitrogen 20mg / L, TP3mg / L, activated carbon powder dosage 15mg / L, magnetic iron powder dosage 3mg / L, ozone dosage 1mg / mg COD , the dosage of 30% concentration of hydrogen peroxide is 20mg / mg COD, the residence time of regulating tank is 12 hours, the residence time of heterogeneous catalytic oxidation is 2 hours, the residence time of biosorption oxidation separation tank is 24 hours, the residence time of magnetic coagulation sedimentation tank is 30min, and the final effluent COD Less than 40mg / L, BOD less ...

Embodiment 3

[0058] Production wastewater of a chemical company in Shandong, water volume 100m 3 / h, the main pollutants are production raw materials and reaction intermediates, specifically polycyclic aromatic hydrocarbons. Take some water samples and use the process of the present invention ("water collection adjustment + multi-phase catalytic oxidation + biological adsorption oxidation separation + magnetic coagulation precipitation") process to explore the dosage of different activated carbon powder, magnetic iron powder, ozone and hydrogen peroxide Influence on its processing effect:

[0059] Condition 1: dosage of activated carbon powder: 20mg / L, dosage of magnetic iron powder: 5mg / L, dosage of ozone 2mg / mgCOD, dosage of 30% hydrogen peroxide 5mg / mgCOD.

[0060] Condition 2: dosage of activated carbon powder: 5mg / L, dosage of magnetic iron powder: 5mg / L, dosage of ozone 2mg / mgCOD, dosage of 30% hydrogen peroxide 5mg / mg COD.

[0061] Condition 3: dosage of activated carbon powder: 2...

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Abstract

The invention relates to the field of wastewater treatment systems, and especially relates to a low-concentration refractory chemical wastewater treatment method and system. The method comprises the following steps: collecting and adjusting wastewater, and adding activated carbon powder and magnetic iron powder into a pool; carrying out heterogeneous catalytic oxidation: carrying out heterogeneouscoupling catalytic oxidation through ozone, hydrogen peroxide, activated carbon powder and magnetic iron powder; carrying out biological adsorption oxidation; and carrying out magnetic coagulative precipitation. According to the low-concentration refractory chemical wastewater treatment method, physicochemical and biochemical combined treatment is adopted, the activated carbon/magnetic iron powder penetrates through the whole system process, the whole-process adsorption micro-electrolysis environment is achieved, the treatment effect is enhanced, pollutants are enriched in a limited mode by adding the activated carbon/magnetic iron powder into the water collection adjusting tank, and subsequent stage treatment is facilitated.

Description

technical field [0001] The invention relates to the field of wastewater treatment systems, in particular to a method and system for treating low-concentration refractory chemical wastewater. Background technique [0002] A large amount of chemical wastewater produced in the chemical production process contains more chemical raw materials, products and by-products, most of which are complex in structure, toxic and harmful, and difficult to biodegrade. This leads to the complexity and diversity of chemical wastewater pollution. At present, pretreatment and biochemical combination are mostly used for treatment. Pretreatment measures include flocculation and sedimentation, air flotation, stripping, adsorption, catalytic oxidation, etc.; biochemical methods include SBR, Contact oxidation, AAO, etc. At present, most of the treatment processes have the following problems: 1) The series treatment process only combines physicochemical and biochemical machinery, and does not give ful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30
CPCC02F9/00C02F1/488C02F1/78C02F1/722C02F1/725C02F2101/30C02F2305/026C02F3/30C02F3/00
Inventor 李萌韩少科陈倩贠小淇
Owner 北京新林环境科技有限公司
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