原液补碳模式对猪场厌氧消化液SFSBR处理特性的影响

针对猪场粪尿厌氧消化液在后续生物处理过程中碳源,碱度的严重失衡问题,采用"缺氧（A1）+曝气（O1）+缺氧（A2）+曝气（O2）"的分步进水序批式反应器（SFSBR）处理,以实现碳源,碱度的体系内自平衡利用.通过改变A1,A2段的补碳量（采用定量的猪场粪尿原液,分别以1：1,1：3和3：1的体积比在反应器每个周期的A1,A2阶段启动时补碳,分别简称工况I,Ⅱ,Ⅲ）,研究原液补碳模式对处理过程脱氮除磷特性的影响.结果表明,3种补碳模式均实现了短程硝化反硝化脱氮,反应器内pH值均稳定在8.5左右,NH₄⁺-N去除率均达到95%以上.原液补碳直接影响反硝化过程,工况I,Ⅱ条件下A2段反硝化速率分别为2.19和2.15mg/（g·h）,均约为工况Ⅲ A2段的1.6倍.不同工况下原液补碳对A段释磷和O段吸磷有显著差异,工况I和Ⅲ条件下SFSBR除磷效果更佳,出水TP浓度分别为7.9和6.4mg/L,去除率分别达到84.4%和87.3%,相较于工况Ⅱ分别提高了9.5%和12.4%.综合考虑脱氮除磷,有机物降解以及碳源/碱度自平衡控制,工况I为最佳补碳模式,系统出水COD,NH₄⁺-N和TP浓度分别为360,10.6和7.9mg/L,相应的去除率分别为74.9%,98.6%和84.4%.研究表明,采用A1/A2段原液添加比为1：1的补碳模式（即工况I）能在碳源/碱度自平衡的基础上实现猪场粪尿厌氧消化液的高效脱氮除磷.

Effects of carbon supplementation modes of raw wastewater on the performance of SFSBR for anaerobically digested swine manure treatment

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.