CAJ | 학술논문

为改善已形成颗粒污泥的IC反应器运行性能，增设外循环装置，并在回流比分别为0、1.0、2.0、3.0、4.0的情况下，进行了系统运行稳定性研究。与无外循环的情况相比，在设定的回流比范围内，附加外循环不会破坏反应器内部厌氧条件，反应器运行稳定；在进水COD为6000 mg·L-1左右，系统HRT约为10 h，容积负荷为14 kg·m-3·d-1的情况下，系统污泥MLSS有所增加，COD去除率随回流比的增大而增加，最高可达97.3%，出水COD低至160 mg·L-1；随回流比的增大，产气总量逐渐增加且最终可达171.2 L·d-1，甲烷产量先增加后趋于稳定，在回流比为2.0时可达到91.7 L·d-1；增加外循环运行一段时间后，厌氧颗粒污泥生物相更为丰富，产甲烷优势菌由甲烷杆菌转变为甲烷八叠球菌。结合能耗和去除效率等考虑，回流比为2.0时最佳。
위개선이형성과립오니적IC반응기운행성능，증설외순배장치，병재회류비분별위0、1.0、2.0、3.0、4.0적정황하，진행료계통운행은정성연구。여무외순배적정황상비，재설정적회류비범위내，부가외순배불회파배반응기내부염양조건，반응기운행은정；재진수COD위6000 mg·L-1좌우，계통HRT약위10 h，용적부하위14 kg·m-3·d-1적정황하，계통오니MLSS유소증가，COD거제솔수회류비적증대이증가，최고가체97.3%，출수COD저지160 mg·L-1；수회류비적증대，산기총량축점증가차최종가체171.2 L·d-1，갑완산량선증가후추우은정，재회류비위2.0시가체도91.7 L·d-1；증가외순배운행일단시간후，염양과립오니생물상경위봉부，산갑완우세균유갑완간균전변위갑완팔첩구균。결합능모화거제효솔등고필，회류비위2.0시최가。
In order to improve the performance of internal circulation(IC) reactor in which granular sludge had formed, an additional external circulation device was added to the reactor. The operation stability of this system was investigated at various reflux ratios of 0, 1.0, 2.0, 3.0 and 4.0. Compared with without external circulation situation, additional device do not indeed damage anaerobic conditions inside the IC reactor and the reactor operation was stable at given range of reflux ratio. When chemical oxygen demand(COD) of influent was 6000 mg·L-1, hydraulic retention time(HRT) about 10h, and volume loading 14 kg·m-3·d-1, the MLSS of system (mixed liquid suspended solids) and the removal rate of COD increased with the growth of reflux ratio, and could reach the maximum 97.3%and the lowest COD of effluent 160 mg·L-1 respectively. With increase of reflux ratio, the total quantity of biogas produced increased to 171.2 L·d-1. The methane production increased at the beginning and then maintained stabilization, and was 91.7 L·d-1 at reflux ratio 2.0. Remarkably, biodiversity in granular sludge had been improved due to additional external circulation. After the system with additional external circulation operated for a period of time, the dominant bacteria for methane production changed from Methanobacterium to Methanococcus. After comprehensive consideration of energy consumption and COD removal rate, the optimal reflux ratio would be 2.0.