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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Optimization of main factors associated with nitrogen removal in hybrid sludge sequencing batch reactor with step-feeding of swine wastewater
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Optimization of main factors associated with nitrogen removal in hybrid sludge sequencing batch reactor with step-feeding of swine wastewater

机译：猪粪便分步进料的混合污泥排序间歇反应器脱氮主要因素的优化

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摘要

To attain a high nitrogen removal efficiency and good sludge settleability in a step-fed sequencing batch reactor (SFSBR) treating swine wastewater, L_9(3~4) orthogonal experiments were carried out to optimize main factors associated with nitrogen removal, namely, the influent C/N ratio, feeding volume ratio, nitrogen loading rate and aeration intensity. Results showed that nitrogen loading rate contributed most for the build-up of NO_2~- -N, NO_3~--N and NH_4~+-N in the effluent, while aeration intensity was the most important factor for net nitrogen removal efficiency based on the initial and final nitrogen concentrations in the SFSBR cycle. Additionally, the periodic starvation created by stepwise feeding was the major inducing force for granulation in the SFBSR process and the influent C/N ratio had a profound influence on sludge settleability and granular sludge stability in terms of sludge volume index (SVI) and the fraction of granular sludge with diameter over 0.5 mm (f_(0.5 mm) ), respectively. Considering the most and secondary important control factor for individual response index, the optimal operating condition for nitrogen removal of SFSBR treating swine wastewater was determined as A_3B_3C_1D_2, i.e., influent C/N ratio 7.0 mg COD/mg NH_4~+-N, feeding volume ratio 3:1, nitrogen loading rate 0.026 g NH_4~+-N/gVSS • d and aeration intensity 4.2 L/m~3 • s, respectively. Under the optimal operating conditions, inorganic nitrogen concentration in the effluent, net nitrogen removal efficiency, SVI and f_(0.5 mm) reached 21 mg/L, 72 %, 40.7 mL/g and 4.3 %, respectively.
机译：为了在步进进料分批间歇反应器（SFSBR）处理猪废水中获得较高的脱氮效率和良好的污泥沉降性，进行了L_9（3〜4）正交实验，以优化与脱氮相关的主要因素，即进水碳氮比，进料量比，氮负荷率和曝气强度。结果表明，氮负荷率对废水中NO_2〜--N，NO_3〜--N和NH_4〜+ -N的积累贡献最大，而曝气强度是影响净氮去除效率的最重要因素。 SFSBR循环中的初始和最终氮浓度。此外，分步进料产生的周期性饥饿是SFBSR过程中造粒的主要诱导力，进水的C / N比对污泥的沉降性和颗粒污泥稳定性（从污泥体积指数（SVI）和分数）方面有深远的影响。直径分别超过0.5 mm（f_（0.5 mm））的颗粒污泥的数量。考虑到个体反应指数的最高和次要重要控制因素，确定了SFSBR处理猪废水脱氮的最佳操作条件为A_3B_3C_1D_2，即进水C / N比7.0 mg COD / mg NH_4〜+ -N，进料量比例为3：1，氮负载量为0.026 g NH_4〜+ -N / gVSS•d，曝气强度为4.2 L / m〜3•s。在最佳操作条件下，废水中的无机氮浓度，净氮去除效率，SVI和f_（0.5 mm）分别达到21 mg / L，72％，40.7 mL / g和4.3％。

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