| The Sludge-Shifting SBR Process is put forward to resolve the problems of insufficient stability and using sludge without connection between different reactors in the existing SBR and its derivative process by our team, and consists of a continuously running proposed bio-selector and multi-SBRs, aimed to improving the pollutant removal ability of SBR through increasing biomasses in the reaction stage and raising utilization of the working volume of the reactor and corresponding water filling ratio through decreasing biomasses in the settling stage by means of returning sludge. The Sludge-Shifting SBR Process is aimed to enrich phosphorus accumulating organisms by virtue of spatial substrate gradient between bio-selector and multi-SBRs,which enhance the transient condition. With synthetic wastewater as carbon source, the results show that:(1) The phosphorus release and carbon source utilization in bio-selector were affected by the sludge shifting volume. The amount of phosphorus release under the sludge shifting volume 30%、40% was better than the 15% of sludge shifting volume. PHA synthesis and the amount of phosphorus release under anerobic area represent a positive correlation. The result of static phosphorus release showed that sludge shifting could improve the ability of phosphorus-release. The result showed that the sludge shifting could enhance the ability of storing carbon source, when the sludge shifting volume were 15%、30%、40%, the YSTOD was0.25、0.31、0.37 respectively, the the levels of Poly-P degradation was 2.43mg·g-1、11.97 mg·g-1、14.18 mg·g-1 respectively.(2) The synthesis and degrade of intracellular and phosphorus removal were affected by the sludge shifting volume. The sludge shifting system is better than no shifing system about phosphorus removal;with sludge shifting volume increase, the phosphorus metabolism removal is more conducive.when the sludge shifting volume were 0%、 15%、30%、40%, △PHA/△COD were 0.34、0.39、0.42、0.46 respectively. △P/△COD were 0.08、0.24、0.26、0.33 respectively. SRPR were 3.86 mg·(g·h)-1、4.13 mg·(g·h)-1、4.88 mg·(g·h)-1、6.52 mg·(g·h)-1 respectively. SPUR were 2.26 mg·(g·h)-1、2.92 mg·(g·h)-1、4.37 mg·(g·h)-1、6.89 mg·(g·h)-1 respectively.(3) The synthesis of intracellular and phosphorus removal were affected by influent carbon concentration. With influent carbon concentration increased, the spatial substrate gradient、 YSTOD and the amount of phosphorus release increase under the sludge shifting volume of 30%.(4) The synthesis of intracellular and phosphorus removal were affected by influent modes. The result showed it is advantageous to synthesize intracellular polymer under pulse, the PHA was 22.57 mg·g-1、35.16 mg·g-1 respectively under the circumstances of continuing feeding for 96 min and pulse.(5) The synthesis of intracellular and phosphorus removal were affected by SRT. It was advantageous to absorb carbon source and express Poly-P model under short SRT. when SRT was 5d、10d、20d under anaerobic area, The △PHA/△COD was 0.36、0.34、0.29 respectively, △P/△COD was 0.10、0.08、0.04 respectively。... |
PDF Full Text Request