Effects of carbon supplementation modes of raw wastewater on the performance of SFSBR for anaerobically digested swine manure treatment
FENG Tao1,2, LI Ping1,2, WU Jing1,2, MA Jin-zhen1,2, HUANG Yu-sheng1,2, XU Meng3, WU Jin-hua1,2
1. Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education), School of Environment and Energy, South China University of Technology, Guangzhou 510006, China;
2. Key Laboratory of Pollution Control and Ecological Restoration of Guangdong Higher Education Institutes, South China University of Technology, Guangzhou 510006, China;
3. Poten Environment Group Co., Ltd., Beijing 100082, China
In order to solve the problem of serious imbalance of carbon source and alkalinity in the subsequent biological treatment process, anaerobically digestate swine manure was treated by step-fed sequencing batch reactor running the program for "anoxic (A1) + aeration (O1) + anoxic (A2) + aeration (O2)", to achieve self-balance utilization of carbon source and alkalinity in the system. By changing the supplemental amount of carbon in A1and A2stage (the quantitative raw swine manure was used for carbon supplementation in the volume ratio of 1:1, 1:3 and 3:1 at the start of A1 and A2 stages of each cycle of the reactor, respectively, referred to as condition I, Ⅱ, Ⅲ), the effect of carbon supplementation mode of raw swine manure on the nitrogen and phosphorus removal characteristics of the treatment process was studied. The results showed that short-cut nitrification and denitrification was achieved in all three carbon supplementation modes, the pH value in the reactor was stable at about 8.5 and the removal rates of NH4+-N were above 95%. The carbon supplementation of raw manure directly affected the denitrification process. The denitrification rates of the reactor in A2 stage under the condition I and Ⅱ reached 2.19 and 2.15mg/(g·h), respectively, which were about 1.6 times as high as that under the condition Ⅲ. The carbon supplementation of raw manure had significant differences between A-stage phosphorus release and O-stage phosphorus uptake under the three conditions. The SFSBR phosphorus removal effect was better under the condition I and Ⅲ, the effluent concentrations of TP were 7.9 and 6.4mg/L respectively, the efficiencies of TP removal were 84.4% and 87.3% respectively, which were 9.5 and 12.4percents higher than those of condition Ⅱ, respectively. With a comprehensive consideration of nitrogen and phosphorus removal, organic matter degradation and carbon source/alkalinity self-balance control, the condition I was the best carbon supplementation mode, the effluent concentrations of COD, NH4+-N and TP were 360, 10.6and 7.9mg/L respectively, and the removal rates were 74.9%, 98.6% and 84.4% respectively. The results also indicated that the carbon supplementation mode which the A1/A2 raw wastewater addition ratio was 1:1 (condition I) can realize the high-efficiency nitrogen and phosphorus removal of anaerobically digested swine manure on the basis of carbon source/alkalinity self-balance.
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