Ozone-Sludge Hydrolysis Acidification Research

The present situation of treatment and disposal of sludge, the traditional sludge treatment and disposal methods have been unable to face increasingly severe environmental stress and economic challenges, the research and promotion of sludge reduction technology has important practical significance in the field of biological wastewater treatment.Sludge reduction in achieving growth through strengthening various sludge crack hidden techniques, hydrolysis acidification technology as a cross between aerobic and anaerobic wastewater treatment technology, has high removal efficiency of organic matter, which can handle high concentrations, refractory wastewater, small volume treatment facilities to handle large amount of water,low operating costs, but also to achieve "water, mud" synchronization features, to overcome the long residence time of anaerobic biological treatment processes,the characteristics of high environmental requirements, play a major role in wastewater treatment and sludge treatment and disposal. The main difficulty lies in the sludge hydrolysis acidification inefficient microbial cell walls cracked, and ozone oxidation technology with characteristics of high crack efficiency, low energy consumption, easy to cause secondary pollution, just to make up for this weakness of hydrolysis acidification. Therefore, the research and development of the "ozone oxidation and hydrolytic acidification" technology to bring a broad prospect in the field of sludge reduction, hydrolysis acidification advantage to play a greater extent, to meet the requirements of "water, mud" synchronization process.In this study, laboratory bioreactor secondary clarifier sludge as the research object, using ozonation for pretreatment, hydrolysis acidification of mesophilic anaerobic sludge treatment process. In this paper, do theoretical analysis and experimental research in ozonation crack sludge reduction technologies and the mesophilic sludge ozonation solution hydrolysis acidification processes, focusing on under different conditions of ozone dosage, sludge and water quality indicators before and after ozonation sludge Characters changes in laws and mechanism analysis; also studied under different conditions of ozone dosage,ozone oxidation and sludge water quality indicators and mechanisms of variation of traits with the number of days of hydrolysis acidification analysis.Experimental results show quite different effects on the ozone dosage sludge traits, MLSS concentration and MLVSS concentration of sludge increased with the increase of ozone dosage gradually decreased and appear the same trend,when the ozone dosage reached 90 mg O3/g TS, activated sludge MLSS concentration and MLVSS concentration were reduced to 4000mg/L and2000mg/L or less, there is a minimum of ozone effective dosage 34 mg O3/g TS;ozone dosage in 90 mg O3/g TS of SCOD concentration is four times the amount of ozone dosage in 0 mg O3/g TS; ammonia concentration increases essentially ozone dosage of rise; ozone dosage in 54 mg O3/g TS of TP concentration is four times the amount of ozone dosage in 0 mg O3/g TS.The ozonated sludge into hydrolysis acidification reactor was investigated in the temperature(35 ℃) sludge supernatant different ozone dosage treatment hydrolysis acidification changes in the conditions of each material composition,and on this basis to determine the most good ozone dosage. When ozone dosage is 90 mg O3 / g TS, volatile organic acids(VFA) concentration reaches a maximum 315 mg / L in the first two days; ammonia concentration increases overall hydrolysis time increased acidification; TP concentration and COD concentration increases appear now and then over time hydrolysis acidification changes slowly lower; MLSS concentration sludge mixture is acidified with hydrolysis time increased gradually decreased with the increase of ozone dosage,MLSS removal also increases, rising from 16.8 percent to 35.4 percent.