| An anaerobic baffled reactor(ABR),as a new kind of high rate anaerobic biological reactor, incarnates perfectly the main theory of SMPA (Staged Multiphase Anaerobic Reactor) . But there have been few researches about it in domestic by far, especially its mechanism.On the basic of previous researches, we modified the structure of ABR firstly, then to study the performance of the modified ABR. At last, establishing a kinetics model is to simulate the microbial degraded process. The experimental results showed that ABR should be started under low loadings. At the same time, pH should be supervised strictly in order to avoid the acidification to occur. When acidification is occurring, pH should be adjusted between 6.5 and 7.8 to make methanogenic bacteria in the adaptive growth circumstance. ABR should be operated above 18℃. The nicer granulation can be formed in ABR, besides, enhancing befittingly the influent loading can accelerate granulating. During the steady-state performance, when the COD and volume loading rate(VLR) in the influent are 3000mg/L and 8.05kgCOD/(m3.d) separately, the efficiency of COD removal can reach 89.8%. ABR has the better ability to adapt the varying temperature than UASB, the lower sludge washing out is resulted from ABR comparing with UASB, and the granulation in ABR can be formed more quickly than that in UASB. When ABR was employed to treat low concentration wastewater, a kinetics model could be established to describe the microbial degraded process, the equation is following: So =Si ·exp(K2t2)/(1+ K1Xmt1). When average room temperature is 29.6 ℃ , the values of the parameters were K1 = 8.80 × 10-3(L/(mgVSS . d)), K2 = 0.2675(L/(mgVSS . d)), separately, the corresponding kinetics equation is So = Si · exp(0.2675t2)/(1+ 8.80×10-3Xmt1) .
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