4 results about "Sludge fermentation" patented technology

This invention discloses an apparatus and method for achieving deep nitrogen removal and phosphorus recovery through dual short-range coupled anammox fermentation using in-situ sludge fermentation. First, calcium chloride solution is added to the anammox reactor at the rear end of a two-stage PNA process to form recoverable phosphorus crystals such as Ca-P precipitates. Anaerobic ammonia oxidizing bacteria attach to the surface of the precipitates, thereby enriching and retaining them within the anammox reactor. During the continuous formation of anaerobic ammonia oxidizing particles, unfermented waste activated sludge is added to the PNA process. The slow hydrolysis and acidification of the waste activated sludge provide a carbon source for the short-range denitrifying bacteria, completing the transformation from single-stage PNA autotrophic nitrogen removal to dual short-range coupled anammox synergistic nitrogen removal. In this invention, the anaerobic ammonia oxidizing bacteria in the granular sludge after operation can reach 12%, 73% of the sludge exhibits a particle size greater than 200 μm, and the total nitrogen removal rate remains above 90%, with most phosphorus existing in the recoverable form of Ca-P crystals.

The application discloses an energy-saving and environment-friendly sludge fermentation deodorization device and process, and belongs to the technical field of sludge treatment. The energy-saving and environment-friendly sludge fermentation deodorization device and process comprise a shell, a heat exchange pipe is arranged around the first conveying pipe, the heat exchange pipe is arranged in the shell, the heat exchange pipe is filled with a heat-conducting medium, and the heat-conducting medium is used for absorbing the heat of fermentation materials and transferring the heat to the gas in the first conveying pipe when the temperature of the fermentation materials is higher than the temperature of the gas in the first conveying pipe. The application solves the problem that the biological heat generated by materials is directly discharged with tail gas in the existing fermentation device, and energy is wasted. The heat exchange pipe is arranged around the first conveying pipe in the shell, the heat-conducting medium is filled in the heat exchange pipe, the heat absorption and heat release characteristics of the heat-conducting medium are utilized, the heat-conducting medium is heated, the heated heat-conducting medium releases heat to the fermentation materials through the heat exchange pipe, and the treatment efficiency of solid waste is improved.

This invention provides a carbon capture and phosphorus removal apparatus and a carbon capture and phosphorus removal method for wastewater treatment. [Solution] The apparatus comprises a wastewater tank 1, an SBR reactor 2 communicating with the wastewater tank, a denitrification reactor 3 communicating with a drain pipe in the middle of the SBR reactor, and an anaerobic digester 4 communicating with a sludge discharge pipe at the bottom of the SBR reactor. A biochar sludge removal device 6 is provided on the anaerobic digester side. The method includes the steps of S1, water injection and stirring, S2, SBR treatment, S3, circulation, S4, sludge fermentation, and S5, magnetic biochar recovery. In this invention, magnetic biochar is introduced into a high-load contact-stabilized SBR reactor to synchronously promote the adsorption of organic carbon and phosphorus in the wastewater, further enhancing the capture effect of dissolved organic matter, promoting the adsorption of organic carbon and phosphorus in the wastewater, and ensuring a stable and efficient carbon capture and phosphorus removal effect.