Safe percolate ultralow emission processing system
A technology for treating system and leachate, which is applied in the field of leachate treatment process in domestic waste incineration plants, can solve problems such as affecting operation safety, increasing operating power, and uneconomical, so as to improve the operating safety level, reduce system operating pressure, and prolong the life of the system. The effect of running time
Inactive Publication Date: 2018-04-17
宁波明州环境能源有限公司
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[0004] However, due to the continuous accumulation of hardness and salt in the concentrated nanofiltration solution, the operating pressure of the nanofiltration system used in the patent number CN201610677052.1 will increase, and the risk of fouling will increase, thus directly affecting the safe and stable operation of the system
Patent No. CN104787929A uses chemical softening to reduce the hardness in the concentrated solution, but the microfiltration membrane has a high penetration rate of colloids and dissolved substances because the filter pore size is at the micron level, resulting in prolonged operation of the subsequent DTRO system. The increase of pressure and operating power is not only uneconomical but also the operating pressure will increase to 9-14MPa, which will affect the operating safety, cause serious fouling and bursting of the diaphragm, not only reduce the leachate treatment efficiency, but also may cause serious damage to the personal safety of the operators. threaten
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[0019] ⑴ if figure 1 As shown, the advanced treatment of leachate in the prior art mainly adopts ultrafiltration + nanofiltration + reverse osmosis treatment process, the final fresh water recovery rate of the system is about 60%, and the concentrated water of about 40% is mainly digested by the incineration plant. ⑵ if figure 2 , image 3 As shown, the back end of aerobic water production adopts a 30nm external high-flow ultrafiltration membrane, which can not only increase the volume of ultrafiltration water production, but also increase the filtration pore size to effectively improve the water quality and reduce the operating pressure of the subsequent system. The concentrated water of the nanofiltration system is treated by the secondary material membrane. The water produced by the material membrane is mixed with the nanofiltration water and enters the reverse osmosis system. The 4.5% concentrated water produced by the secondary material membrane is used for fly ash soli...
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The invention relates to a safe percolate ultralow emission processing system, which is divided into three parts including an ultrafiltration + nanofiltration + reverse osmosis system, a secondary material membrane system and a chemical softening membrane + STRO system. According to the ultrafiltration + nanofiltration + reverse osmosis system, ultrafiltration membrane with pore size of 30 nm is adopted to improve produced water quality, reduce operating pressure of subsequent systems and raise safety level. The secondary material membrane system is used for extracting humic acid and further raising nanofiltration water yield from 85% (yield of a traditional process) to 95%. According to the chemical softening membrane + STRO system, the softening membrane adopts a 30nm PTFE material for ultrafiltration so as to improve produced water quality; and a rotary channel is adopted for the STRO so as to further reduce operating pressure of the system.
Description
technical field [0001] The invention relates to a process for treating leachate of domestic waste incineration plants, in particular to the improvement of the technology for treating concentrated water of landfill leachate. Background technique [0002] At present, the advanced treatment of landfill leachate in domestic waste incineration power plants mostly adopts ultrafiltration + nanofiltration + reverse osmosis treatment technology. Water cannot be fully consumed, which affects the amount of waste entering the waste-to-energy plant, which not only affects the efficiency of the power plant, but also causes urban and rural domestic waste to accumulate and pollute the environment. [0003] The traditional leachate concentrated water treatment system, such as CN201610677052.1, connects the concentrated water outlet of the nanofiltration system to the inlet of the MBR system, connects the concentrated water outlet of the reverse osmosis system to the concentrated water tank, ...
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IPC IPC(8): C02F9/04C02F103/06
CPCC02F1/44C02F1/441C02F1/442C02F1/444C02F5/00C02F9/00C02F2103/06C02F1/00
Inventor 许力孙超甘雨何势黄祎晨白皓东闵涛焦学军瞿兆舟白力周大伦陈宏伟张桂仙毕蕾
Owner 宁波明州环境能源有限公司