Process and device of low energy consumption sewage treatment based on carbon source recovery

Abstract

The invention relates to a process and a device of low energy consumption sewage treatment based on carbon source recovery, which belong to the technical field of sewage (waste water) treatment. A process flow comprises a rapid coagulating basin, an anaerobic dynamic membrane-bioreactor, an effluent natural reoxygenation machine, an anaerobic digestion reactor and a gas collector. High efficient flocculation of low concentration organic sewage is carried out in the rapid coagulating basin, solid-liquid separation of the low concentration organic sewage is carried out in the anaerobic dynamic membrane-bioreactor, natural reoxygenation of effluent is carried out, and water quality stably achieves the national second grade discharge standard. Simultaneously, recovered low-quality carbon sources (anaerobic sludge) enter the anaerobic digestion reactor to finally enable energy matters in the sewage to be recovered in a mode of high-quality carbon sources of volatile fatty acids (VFAs) or methane and the like through a hydrolyzing-fermenting and producing acids-producing the methane approach. By means of coupling between a sewage treatment method and an anaerobic organism treatment process, high efficient treatment of the low concentration organic sewage is achieved in a short hydraulic retention time. The high efficient treatment of the low concentration organic sewage can be carried out on the condition of normal temperature, and energy conservation and consumption reduction of the sewage treatment can be achieved to the greatest extend.

Description

technical field [0001] The invention belongs to the fields of environmental protection and sewage treatment, and in particular relates to a low-energy sewage treatment process and device based on carbon source recovery. Background technique [0002] Resource shortage and climate change are the greatest challenges and threats faced by mankind in the 21st century. At present, all countries in the world are actively taking actions to save energy resources and reduce greenhouse gas emissions. With the continuous deepening of energy saving and emission reduction work, urban sewage treatment plants, as one of the main carriers of emission reduction, are particularly important in emission reduction work. Under this background, the traditional biological treatment process, which has been developed for nearly 100 years and is widely used in the world, is undergoing unprecedented doubts. In the traditional activated sludge method (conventional activated sludge, CAS) and its derivativ...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the current front-end carbon source recovery process: (1) using microorganisms to enrich and recover carbon sources under aerobic conditions still needs to consume a certain amount of oxygen; (2) the solid content of sludge Low (4000 mg / L-6000 mg / L), the sludge needs to be pre-concentrated in the future to improve the comprehensive utilization efficiency; (3) The use of short sludge age membrane-bioreactor technology for solid-liquid separation has serious membrane pollution problems, but it is difficult to guarantee the solid-liquid separation effect by using the traditional precipitation process

Images