Study On ABR Removing Organics From Municipal Wastewater Under Normal Temperature

This study used anaerobic baffled reactor (ABR) to treat municipal sewage. The content of the study include the manufacture of the reactor, the inoculation and acclimation of anaerobic sludge, the startup of ABR, the performance of ABR under different HRT, the performance of compartments in ABR, the effect of low temperature on ABR, the characteristic of sludge in the rector and studied the application foreground of ABR at last.The results of experiment showed that: ①Prolong the time of HRT cap raise the removal rate of ABR. The removal rate can raise from 80% to 86.1% when prolong the HRT from 5.2h to 9.6h at 25 ℃ and 226.0~570.4mg/L COD in the influent .Continue prolonging the HRT, the removal rate of COD has few raise again. So the best HRT of ABR to treat municipal sewage is at about 9.6h. ②The removal rate in the fist compartment was higher than the other ones. For the turbidity, the removal rate in the first compartment can get 76.4% while the others add up to 8.8%; For the organics, the first compartment removed more than 83% of the total removal rate. Because the reactor have the ability of entrapment for sludge, so the effluent doesn't require sedimentation.③Reducing temperature could influence the removal efficiency little before 16℃, and the removal rate of COD can be more than 79% and 68% when the temperature is 16℃ and 12℃ respectively. The removal efficiency would be bad when the temperature dropped to under 10℃. Prolong the time of HRT form 5.2h to 10.0h could raise the removal rate from 68.0% to 72.4% for COD at the temperature of 12℃. ④ABR was stable to hydraulic and organic shock loadings. The concentration of COD raised to 570.4mg/L from 226.0mg/L, the reactor still has a removal rate of more than 77%. ⑤In the study the degradation kinetic model of soluble BOD with HRT for municipal sewage treatment was built. ⑥ABR would produce little sludge and can obtain granulated active sludge which is difficult to drain from the reactor and can maintain high quantity of sludge. In the first and Second compartment, appeared some granulated active sludge which diameter is 0.5-1mm, and in the other two compartment haven't granulated active sludge because of low organic loading.⑦ABR is fit for treating waste water in the villages and towns because of its simple process, easy operating, low investment than the other waste water treatment technology.