| The livestock and poultry breeding wastewater, with the large water quality fluctuation range, high content of slag, organic matter, nitrogen and phosphorus causes many the environmental problems, which not only affect the economic development, but also have a certain impact on the health of the residents. Aerobic granular sludge is a granular microbial self-flocculant which is cultured in aerobic reactor. Aerobic granular sludge has the advantages of good settling property, strong anti impact ability, and the capacity of absorbing heavy metals and toxic substances, which become a good choice for the treatment of wastewater. Therefore, this topic is mainly on the analysis of the processing characteristics of aerobic granular sludge in farming biogas fluid treatment and the impact factors on system stable operation.The SBR reactor with granular sludge operated continuously and stably for 180 days. During the process of reactor operation, the ammonia nitrogen reached 97%, but the removal efficiency of total nitrogen was low, only 19%, The reason is that the ratio of BOD5/TN is 0.58, which means that the water supply of carbon source is insufficient, leading to the low removal rate of TN. Throughout the course of the operation, the system shows good adaptability and stability of long-term operation.Through analyzing the effects of 10L/min (R1) and 6L/min (R2) on the performance of nitrogen and phosphorus removal, the stable operation of the system and the optimization of the operating conditions, the influence of the operation conditions on the process stability was studied. The study shows that the two systems can be operated stably for a long time, and the settling properties (SVI5) and organic matter content (MLVSS/MLSS) of the granular sludge in the two systems are basically the same. When the aeration quantity under the condition of large (lOL/min), the system of ammonia nitrogen and total nitrogen removal rate is higher than the amount of aeration when minor (6L/min). The removal rate of COD of R1 and R2 were 55.36% and 69.29%, which means the degradation effect of COD is better under the condition of 6L/min. The removal efficiency of total nitrogen was basically the same in two systems. The removal rate of total nitrogen in two systems was 29.23% and 28.75%, respectively. The specific degradation rate of total nitrogen was 50.10 mg TN/g VSS-d and 38.24 mg TN/g VSS-d, respectively.In the light of the influence of external factors (temperature and influent phosphorus element) in process operation, Investigation does not control the temperature and the lack of phosphorus in two external factors on aerobic granular sludge process effect. In order to provide theoretical guidance and practical application for the further processing of livestock wastewater treatment. The operating temperature is 16～22℃(R1) and 26℃(R2) and the influent phosphorus concentration is 5mg/L (R1) and 50mg/L (R2), which can keep the system running stably for a long time. However, with different temperature conditions and phosphorus concentration, the system will have an impact on the system. When the influent phosphorus concentration was 5mg/L and 50mg/L, the organic matter content (MLVSS/MLSS) of the granular sludge was 94±4%,92±2% under the condition of reactor operating stably, it means the system in the low phosphorus group of activated sludge in the proportion of higher. The Zeta potential was -10.5±1.27mV and -7.37±1.23mV, and the Zeta potential of the granular sludge in the reactor with smaller influent phosphorus was lower, and the granular sludge had stronger stability. In stable operation stage, the two systems of phosphate specific degradation rate respectively to1.41±0.17 mg PO43--P/g VSS-c and 2.67±0.82 mg PO43--P/g VSS-c and COD of specific degradation rate respectively for 117.64±0.08 mg COD/g VSS-c and 150.43 ±0.13 mg COD/g VSS-c, ammonia nitrogen and total nitrogen gradient solution rate of 110.03 ±0.48mg NH4+-N/g VSS-c,132.23±0.31 mg NH4+-N/g VSS-c and of 50.22±0.84 mg TN/g VSS-c, were 69.99±0.62 mg TN/g VSS-c. It indicates aerobic granular sludge has a good effect on the removal of nitrogen and phosphorus under the condition of the influent phosphorus adequate. When the SBR reactor operating temperature is 16～22 ℃ and 26 ℃, the sludge concentration of R1 and R2 up to 7656 mg/L and 9228 mg/L, the ratio of MLVSS/MLSS is basically consistent with the change trend, and higher operating temperature was more favorable to the activity of sludge in the stable granular sludge system. The removal efficiency of R1 and R2 was low, with the removal rate of 14.58% and 10.42%, respectively, the removal rate of ammonia nitrogen was 74.14% and 88.26%, respectively, It could be concluded that the removal efficiency of nitrogen was better when the reactor was under conditions of temperature. |
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