Sewage disposal and energy recovery method based on three-stage membrane separation technology

Abstract

The invention belongs to the technical field of sewage disposal and discloses a sewage disposal and energy recovery method based on a three-stage membrane separation technology. Existing sewage disposal processes have a limited disposal effect on sewage, and the quality of purified water still needs to be improved. In view of the problems in the prior art, according to the disclosed sewage disposal and energy recovery method based on the three-stage membrane separation technology, firstly, a first-stage dynamic membrane reactor, a second-stage microfiltration membrane reactor and a third-stagenanofiltration membrane reactor sequentially perform solid-liquid separation on sewage through mutual cooperation, and water discharged by the third-stage nanofiltration membrane reactor is disposedby a capacitor deionization reaction device to remove ammonia nitrogen, and then the quality of the discharged water can satisfy the national first-class A emission standard; recovered organic carbonsources are subjected to anaerobic fermentation to obtain methane gas, and residual liquid after fermentation flows back into the membrane reactors to achieve reutilization of a flocculant; fermentedsludge residues are adopted for fertilizer utilization and phosphorus resource recovery. The process flow of the method is simple, the discharged water disposed by means of the method satisfies the first-class A emission standard, the recovery of the carbon sources and nitrogen-phosphorus resources can be both achieved, and the maximum utilization of sewage resources can be achieved.

Description

technical field [0001] The invention relates to a sewage treatment and energy recovery method, in particular to a sewage treatment and energy recovery method based on a three-stage membrane separation technology, and belongs to the technical field of sewage treatment. Background technique [0002] At present, the treatment process of urban sewage is the aerobic activated sludge process and its derivative biological treatment process. The main treatment core of these processes is to convert organic matter in sewage into residual sludge and CO 2 The form of the exhaust system, to achieve the removal of pollutants. However, limited by the process principle itself, the traditional activated sludge process has problems such as high energy consumption, large carbon emissions, low resource recovery rate, and greenhouse gas emissions, which contradict the current demand for energy conservation and emission reduction and the concept of sustainable development. , Sewage treatment is...

AI Technical Summary

Problems solved by technology

[0005] At present, the sewage treatment process usually adopts a single membrane separation technology to treat the sewage to separate the carbon source in the sewage to purify the water quality. However, the single membrane separation technology has a high treatment load on the sewage, and the treatment effect is limited. Easy to clog, short service life

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