Device and method for coupling micro-alkaline and micro-aerated anaerobic fermentation of sludge with SBR nitrogen and phosphorus removal and sludge reduction

Abstract

The invention discloses a device and a method for coupling micro-alkaline and micro-aerated anaerobic fermentation of sludge with SBR nitrogen and phosphorus removal and sludge reduction, and belongsto the field of low-C/N urban sewage treatment and sludge reduction. The method comprises the following steps: pumping the residual sludge into an anaerobic fermentation micro-alkali micro-aeration device for anaerobic fermentation of sludge to extract an internal carbon source; meanwhile, forming struvite precipitates by NH4<+>-N and PO4<3->-P generated during fermentation and Ca<2+> to remove NH4<+>-N and PO4<3->-P in a fermentation product so as to purify the fermentation product; performing sludge-water separation on the fermentation product in a secondary precipitation tank; pumping supernatant into a fermentation liquid tank; mixing and pumping the fermentation liquid and domestic sewage into an SBR nitrogen and phosphorus removal device. According to the invention, the anaerobic fermentation of sludge is performed under micro-alkali micro-aeration conditions to extract the internal carbon source; the fermentation product is used as an external carbon source; the SBR nitrogen andphosphorus removal device is used to realize deep nitrogen and phosphorus removal of low-C/N urban sewage; the residual sludge of the SBR nitrogen and phosphorus removal device is used in the anaerobic fermentation micro-alkali micro-aeration device to achieve a purpose of sludge reduction while reducing treatment cost of the residual sludge.

Description

Technical field: [0001] The invention relates to a device and a method for anaerobic fermentation of micro-alkaline and micro-aeration sludge coupled with SBR denitrification and phosphorus removal and sludge reduction, and belongs to the technical field of low-carbon ratio urban sewage treatment and sludge reduction. Background technique: [0002] The SBR denitrification and phosphorus removal process is a common process for nitrogen and phosphorus removal and COD removal in sewage treatment plants. The process is simple and the treatment effect is stable. With the change of policy, the SBR process faces a series of problems that need to be solved urgently. For example, due to insufficient carbon sources, denitrification and phosphorus removal cannot be achieved at the same time, adding external carbon sources increases operating costs, and due to excessive sludge production, sludge treatment plants cannot Do not spend a lot of manpower, material resources, financial resour...

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Problems solved by technology

[0005] The present invention proposes anaerobic fermentation of sludge for the problems of insufficient carbon source of SBR denitrification and phosphorus removal device, inability to co-exist well with denitrification and phosphorus accumulation, and difficult treatment of residual sludge in SBR denitrification and phosphorus removal device. As a supplementary carbon source, the liquid enters the SBR denitrificat

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