Patent DE-102005025508-A1 (DE)
Title: Continuous-biotechnological sludge disintegration of suspended solid in liquid sludge, comprises pre-fermentation; splitting organic macro-molecule; obtaining liquid sludge; transferring split product; aerobic post-treating and recycling
Inventor: BENDLER DETLEF
IPC: C02F11/04
Filed: 2005-06-03
Abstract: Continuous-biotechnological sludge disintegration, for the disintegration of suspended solids in liquid sludge from unavoidable waste, remainders and raw materials, comprises pre-fermentation; splitting of the organic macro-molecules present in the liquid sludge; obtaining the liquid sludge as pre-fermentation broth into methane fermenting stage; transferring the split products present in the pre-fermentation broth; obtaining the liquid sludge as a foul fermentation broth; post-treating under aerobic condition and recycling as further less volume-occupying residue. Continuous-biotechnological sludge disintegration, for the disintegration of all suspended solids in liquid sludge from unavoidable waste, remainders and raw materials, which result due to production and services of the communal economy, industries, food processing industry and agricultural industry, with the goal, to reduce the volume and the continuous-biotechnological sludge value of the liquid sludge to a very large extent through the holistic use of the metabolic activities of anaerobic and/or aerobic consortia of bacteria and/or the techniques of process engineering, which also results in energy-laden biogas, comprises pre-fermentation; splitting of the organic macro-molecules present in the liquid sludge, under defined process and environment conditions, by a consortia of hydrolytic bacteria fixed on a static substrate bio-film system and then through consortia of fermentative bacteria fixed on the same substrate bio-film system that are fermented to carbonic acid, gas and alcohol in the pre-fermentation reactor; obtaining the liquid sludge as pre-fermentation broth into the second process step, that is the methane fermenting stage; transferring the split products present in the pre-fermentation broth, under defined process and environment conditions, to methanogenic substrate through a consortia of acetogenic bacteria fixed on the substrate bio-film system and then with the help of consortia of methanogenic bacteria fixed on the same substrate bio-film system energy-laden biogas that is formed in the methane reactor; obtaining the liquid sludge as a foul fermentation broth in the third process step; post-treating under aerobic condition, in which the foul fermentation broth, under defined process and environment conditions is aerated and after the aeration of the remaining total solid mass content, results in a less volume-occupying sediment at the bottom of the airlift reactor and as liquid sludge sediment is transferred to the fourth process step, where it is concentrated and separated by the technique of filtration and/or gravity-separation, and recycling as further less volume-occupying residue, during which the permeate whose chemical oxygen requirement is reduced to more than 90%, with the clear phase of the third process step, directed to a reservoir or into one of the upstream process step and/or to an available clarifier.