| 采用含硫铁化学污泥作为反硝化电子供体进行焦化废水中总氮深度去除 |
| 摘要点击 1694 全文点击 652 投稿时间：2017-11-23 修订日期：2017-12-27 |
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| 中文关键词 硫铁泥 资源化 焦化废水 自养反硝化 深度脱氮 |
| 英文关键词 sludge containing sulfur and iron resource utilization coking wastewater autotrophic denitrification advanced nitrogen removal |
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| 中文摘要 |
| 城市污水处理和大部分的工业废水处理工艺的出水总氮普遍难以达标排放，基于进水水质的C/N值不稳定、提高回流比造成水力负荷增大、降低反应动力学并且耗能、投加有机碳源带来二次污染以及高污泥产率等问题，急需寻求一种节能降耗、操作简单的深度脱氮方法.对此，利用含硫工业废水预处理产生的含硫铁化学污泥作为固相电子供体进行自养反硝化深度脱氮，实验过程中，以焦化废水二级生物出水作为研究对象，考察脱氮性能、硫铁泥转变过程及微生物群落变化，求出废水深度脱氮新工艺的优化反应条件与效果范围.当进水NO3--N、NO2--N浓度分别是（74.54±0.57） mg·L-1、（1.11±0.19） mg·L-1，水力停留时间为18 h时，对应出水浓度分别降低至（2.78±1.08） mg·L-1、（2.87±0.71） mg·L-1；TON（NO3--N+NO2--N）去除率高达90.0%；NO3--N还原速率和NO2--N累积速率分别为12.06 mmol·（L·d）-1、7.74 mmol·（L·d）-1.结果表明，以副产物化学硫铁泥作为电子供体深度脱氮有潜在的工程应用价值，以水处理工艺过程中原位利用废物，解决部分富硫铁化学污泥后续处理问题，表现出资源化利用的综合特征. |
| 英文摘要 |
| In general, it is difficult to reach the total nitrogen discharge standard in the effluent after municipal and industrial wastewater treatment. The problems hindering advanced denitrification include an unstable C/N ratio in the influent wastewater, increased hydraulic loading with increasing reflux ratio, reduced reaction kinetics, high energy consumption, and secondary pollution and high sludge yield resulting from addition of organic carbon sources. Therefore, deep denitrification with the advantages of energy savings and easy operation is urgently needed. To address these issues, chemical iron sulfide sludge, collected after the pretreatment of sulfur-containing industrial wastewater, was used as a solid-phase electron donor to perform advanced denitrification using autotrophic denitrifiers. In this study, the secondary biological effluent of coking wastewater was the influent for denitrification and the performance of denitrification, transformation of sulfide and iron in the sludge, and microbial community changes were investigated. The optimal reaction conditions and effect range of the technology for deep denitrification of wastewater were then calculated. When the concentrations of NO3--N and NO2--N in the influent were (74.54±0.57) and (1.11±0.19) mg·L-1, respectively, the corresponding concentrations in the effluent were reduced to (2.78±1.08) and (2.87±0.71) mg·L-1, respectively, with a hydraulic retention time (HRT) of 18 h. The removal rate of TON (NO3--N+NO2--N) was as high as 90.0%, of which the reduction rate of NO3--N and the accumulation rate of NO2--N were 12.06 and 7.74 mmol·(L·d)-1, respectively. This study showed that the use of chemical sulfide iron sludge as an electron donor for deep denitrification is of practical importance, as it could simplify the subsequent treatment of sulfur- and iron-rich chemical sludge, finally reaching the goal of resource utilization. |
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