| IC reactor have been invested and used extensively in the field of wastewater treatment around the world since it was been developed by Paques Environmental Technology Co., Ltd from 1980's. At present, to develop the sludge treatment process with low-energy and high-efficient for medium and small-size town has become the biggest task of sludge treatment process in China. In order to solve this problem, a new thought put forward is to explore Internal Circulation Thickening and Digestion (ICSTD) Reactor, in which sludge thickening and digestion process by integration. This study redesigns and makes ICSTD reactor on the basis of research and findings about traditional IC reactor and gravity thickener, researches the flow-pattern characteristics and the performance of treating sludge and analyses the influencing factor of operation performance and bio-phase inside reactor.In order to analyze the exit-age distribution function, the flow-pattern test adopts the impulse signal response method with applied electrolyte. According to the result of experiment, it is discovered that the ICSTD flow-pattern is approximately plug flow, the impact factor of ICSTD flow-pattern characteristics is the inflow and gas agitation, the flow-pattern influence of operation performance mostly represents the degradation ratio of contamination and utilization ratio of cubage and plug flow is available for improving the degradation ratio of contamination. Because of gas agitation and inner circulation, the assimilation effect of sludge is good in working. The aerobic active sludge was adopted to domestication in the startup experiment of sludge treatment in New version of Internal Circulation Sludge Thickening and Digestion reactor (ICSTD).When the volume of per day treatment sludge is 50L/d inflow sludge's containing water rate is 99.23%~99.46% The value of VS/TS is 0.65~0.73 the inflow of sludge's COD is 4115mg/L～5780 mg/L, load is 1.31KgCOD/m3·d, outflow sludge's containing water rate is 96.2%～97.3%. The value of VS/TS rises to 0.48 from 0.57 95% COD removal rate is achieved the PH of outflow is 6.6~7.1.and the liquid is clear. At the running stage of load being 1.83kgCOD/m3.d and 2.36kgCOD/m3.d, outflow sludge's containing water rate is 96.2%～97.3%, VS/TS is 0.56～0.58, specific resistance of sludge is 220～550,SS of outflow is 1～3, gas per cubic sludge is 0.7～1.8 m3, COD removal rate is above 95%, pH is 6.5～7.2 and the predominance bacterium of methane in sludge is Methanothrix. The experiment indicates that the sludge thickening performance of ICSTD is better than the traditional thickener which water ratio of outflow sludge is 97.5%～97%, but the assimilation effect is obscure.The statistics analysis results of operation digital shows that the running condition impacting the operation performance of ICSTD includes HRT, methane agitation and water temperature. At the same time, the effect of sludge treatment is connected with HRT except water temperature under 20℃.The experiment of reactor indicates ICSTD accelerates the sludge thickening and digestion reciprocally through integrating thickening and digestion process, which is not only keep the virtue of traditional IC reactor and gravity thickener but coincidence with the desire of low-energy and high-efficiency.
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