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Efficient pretreatment process for household garbage incineration fly ash evaporation system

A domestic waste incineration and treatment process technology, applied in the field of solid waste recycling, can solve the problems of lack of practical application in the pretreatment section of the fly ash washing evaporator

Pending Publication Date: 2021-04-30
江山市虎鼎环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although the "ozone catalytic oxidation + immersion MBR" treatment process has been widely practiced in the field of water treatment, there are few reports in the field of fly ash washing wastewater treatment, especially the lack of practical application in the pretreatment section of fly ash washing evaporator

Method used

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Embodiment 1

[0037] The core ozone purification material (catalytic material) uses activated alumina particles from raw materials sourced from high-temperature roasting, and the main preparation process is as follows:

[0038] 1 Purchase commercial activated alumina with a particle size of 10mm. The main parameters of activated alumina include: adsorption capacity greater than 20%, specific surface area greater than 260m 2 / g, the activated alumina is sieved with a 10mm sieve, and after fully sieving twice, the small-sized activated alumina particles are removed to form uniform activated alumina particles, which are soaked with clean water to remove impurities from industrial products.

[0039] 2 Immerse the sieved uniform activated alumina particles with a volume of 2m 3 In a stainless steel container, 2 mol / L manganese sulfate (MnSO 4 ) for soaking and stirring, so that the manganese sulfate is evenly distributed in the pores of activated alumina, and the soaking and stirring time is 48...

Embodiment 2

[0043] For the effluent of a fly ash washing wastewater treatment pool in Zhejiang, the treatment scale is 250 tons / day, TOC=26.4 mg / L, the concentration of ozone directly added is 36mg / L (uncatalyzed), and the effluent TOC=21.2mg / L , Ozone catalytic oxidation water COD = 13.8mg / L, greatly improving the efficiency of ozone oxidation treatment.

Embodiment 3

[0045]For the effluent of a fly ash washing wastewater treatment tank in Zhejiang, the treatment scale is 250 tons per day, the turbidity of the wastewater washing and cleaning tank effluent = 46NTU, after the "ozone catalytic oxidation + MBR" system treatment, the design flow rate of the submerged ultrafiltration is 6.8L / (m2h), effluent turbidity = 0.1NTU, crystal salt impurities are reduced from 0.95% to 0.45%, greatly improving the quality of crystal salt.

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Abstract

The invention discloses an efficient pretreatment process for a household garbage incineration fly ash evaporation system. Fly ash in a household garbage incineration field is discharged from a clean water tank after countercurrent rinsing and wastewater treatment, the TOC concentration in the discharged water of the clean water tank is further reduced by adopting an ozone catalytic oxidation and MBR pretreatment process, impurity particles in the discharged water of the clean water tank are separated, the operation stability in the evaporative crystallization process is ensured, the evaporator cannot be blocked and scaled due to the influence of impurities in a short time, and the quality of final produced salt is improved. Meanwhile, according to the method disclosed by the invention, the quality of water entering the evaporator is improved, the TOC concentration of effluent of the clean water tank is reduced and the stability of evaporative crystallization in the subsequent treatment process is improved through an ozone catalytic oxidation + MBR process, so that the method is an efficient and economic domestic garbage incineration fly ash evaporative crystallization guarantee treatment process.

Description

technical field [0001] The invention relates to a pretreatment process for resource utilization of domestic waste fly ash, in particular to a pretreatment system for efficient domestic waste fly ash washing and evaporation, and belongs to the field of solid waste resource utilization. Background technique [0002] As the mainstream of domestic waste treatment gradually shifts from sanitary landfill to domestic waste incineration, domestic waste incineration fly ash has become an important pollutant. Domestic waste incineration fly ash refers to the residue collected in the flue gas purification system of domestic waste incineration power plants, which contains organic pollutants such as benzene series, dioxins, and trace heavy metals such as Pb and Cr. According to the "Standards for Pollution Control of Domestic Waste Incineration" (GB18485-2014): "Fly ash from domestic waste incineration should be managed as hazardous waste." Therefore, fly ash must be collected separatel...

Claims

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Application Information

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IPC IPC(8): C02F9/14B01D47/02C02F101/30C02F101/36C02F103/18
CPCC02F1/725C02F1/78C02F3/1268C02F9/00B01D47/02C02F2209/23C02F2209/08C02F2101/30C02F2101/36C02F1/04C02F2103/18C02F2209/20B01D2258/0291
Inventor 宁晓强
Owner 江山市虎鼎环保科技有限公司
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