Method for enhancing hydrolysis and acid production by treating excess sludge by means of combined effect of pyrohydrolysis and surface active agent
A surfactant and excess sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, special treatment targets, etc., can solve the problems of slow hydrolysis rate and low acid production, and achieve increased output, The effect of large economic benefits
Inactive Publication Date: 2016-08-31
BEIJING UNIV OF TECH
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Problems solved by technology
[0005] Aiming at the problems of slow hydrolysis rate and low acid production in the existing sludge fermentation process, this paper proposes a combined method of thermal hydrolysis and adding surfactants to treat excess sludge. Compared with the method of separate treatment, the organic The output of acid, and the temperature of thermal hydrolysis is about 30-60% lower than that of thermal pretreatment alone, and the amount of surfactant added is about 30-70% lower than that of pretreatment using surfactant alone, which is economical and environmentally friendly
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[0019] The present invention will be further described below based on examples, so that those skilled in the art can more professionally understand the present invention. test equipment such as figure 1 shown.
[0020] The specific experimental sludge is the residual sludge from the secondary sedimentation tank of Beijing Gaobeidian Sewage Treatment Plant. After washing and concentration, it is placed in the mud storage tank. The indicators are moisture content=95%, SS=20000~30000mg / L, pH =6.5~7.5. Five sets of reaction devices were set up in parallel and operated simultaneously. In the first set of equipment, 500ml of sludge was added to the 1L reactor through a sludge pump at room temperature, and the agitator was turned on for stirring. After two hours of fermentation, samples were taken from the sampling port of the reactor to determine the content of polysaccharide, protein and VFA in the excess sludge. The second set of devices turned on the heat exchanger to make th...
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The invention relates to a method for enhancing hydrolysis and acid production by treating excess sludge by means of a combined effect of pyrohydrolysis and a surface active agent, belonging to the fields of sludge treatment and resource recovery. According to the method, the excess sludge of a sewage treatment plant is taken as substrate, and the surface active agent is added into the excess sludge under the condition of heating, so that the processes of hydrolysis and acid production are promoted. The surface active agent not only inhibits the activity of methanogens, but also has functions of being amphiphilic and solubilizing, thus being capable of accelerating hydrolysis; when the surface active agent is combined with the pyrohydrolysis for treating the excess sludge, the pyrohydrolysis breaks cell walls, so that the function of the surface active agent is further enhanced, and the aim of enhancing the hydrolysis and acid production of the excess sludge is further achieved. Therefore, the method achieves the aims of accelerating the anaerobic fermentation hydrolysis speed of the excess sludge and enhancing the acid production by means of the combined effect of the surface active agent and the pyrohydrolysis, thus realizing reduction and resource recovery of the excess sludge.
Description
Technical field: [0001] The invention relates to a method for combined thermal hydrolysis and surfactant treatment of excess sludge to strengthen hydrolysis to produce acid, and belongs to the field of sludge reduction and resource utilization. Background technique: [0002] At present, activated sludge process is the most widely used sewage biological treatment technology in my country, but the use of activated sludge process to treat domestic sewage will produce a large amount of excess sludge. The traditional sludge treatment mainly adopts measures such as concentration, dehydration and drying to reduce the moisture content of the sludge, thereby reducing the sludge volume. However, this traditional sludge end treatment technology is not only expensive, but also increases the operating cost of the sewage treatment plant, and cannot reduce the dry matter quality of the sludge from the source, which will still bring huge pressure to the subsequent sludge disposal. At the s...
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Login to View More IPC IPC(8): C02F11/04
CPCC02F11/04C02F2303/06
Inventor 彭永臻郭思宇李夕耀何岳兰高瑶远
Owner BEIJING UNIV OF TECH