| FNA旁侧污泥预处理SBR-PN过程启动及N2O释放特性 |
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| 引用本文： | 张家惠,巩有奎.FNA旁侧污泥预处理SBR-PN过程启动及N2O释放特性[J].环境工程,2021,39(6):72-78. |
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| 作者姓名： | 张家惠 巩有奎 |
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| 作者单位： | 烟台职业学院 建筑工程系, 山东 烟台 264670 |
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| 基金项目： | 国家自然科学基金项目（51508008） |
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| 摘 要： | 在序批式生物反应器（SBR）基础上增设游离亚硝酸（FNA）污泥预处理单元，成功启动了SBR短程硝化（SBR-PN）过程。FNA对NOB的活性抑制远大于其对AOB的抑制，FNA=0.48 mg/L，两者活性差异最大。SBR运行稳定（阶段Ⅰ）后，利用0.48 mg/L的FNA对活性污泥进行24 h缺氧处理，经60 d驯化（阶段Ⅱ），SBR内NH4+-N去除率和亚硝态氮积累率（NAR）均达到95%以上，总氮（TN）去除率由（22.8±3.6）%增至（35.5±3.7）%。分段进水（阶段Ⅲ）方式提高了原水有机物利用率，TN去除率达到（64.0±2.5）%，最大NO2-积累和N2O产量分别由（16.4±1.6） mg/L和（0.85±0.09） mg/L降至（11.4±1.2） mg/L和（0.28±0.04） mg/L，N2O产率由（7.40±0.99）%降至（1.33±0.26）%。基于FNA缺氧抑菌选择性差异，采用分段进水方式运行SBR，防止了高浓度NO2-和NH4+共存，可实现稳定生活污水短程硝化过程并降低N2O释放。经FNA处理，活性污泥蛋白质（PN）和多糖（PS）释放增加，PN/PS由阶段Ⅰ的1.42增至阶段Ⅱ、Ⅲ的1.77和1.74，SVI由阶段Ⅰ的（113±12） mL/gVSS分别增至阶段Ⅱ、Ⅲ的（129±15），（122±13） mL/gVSS。
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| 关 键 词： | 游离亚硝酸 污泥处理 部分硝化 氧化亚氮 胞外聚合物 |
| 收稿时间： | 2020-11-15 |
START-UP OF SBR-PN PROCESS AND N2O EMISSION IN SIDE PRETREATMENT OF WASTED SLUDGE BY FREE NITROUS ACID |
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| Affiliation: | Department of Architecture Engineering, Yantai Vocational College, Yantai 264670, China |
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| Abstract: | The start up of partial nitrification by using free nitrous acid(FNA) to treat activated sludge was studied in a sequencing batch reactor(SBR) treating rural wastewater by recirculating a portion of the sludge through a side-stream sludge treatment unit. FNA is substantially more biocidal to NOB than to AOB. The difference was the highest at the FNA concentration of 0.48 mg/L. With 3.6 L activated sludge treated by 0.48 mg/L FNA for 24 h under anoxic condition each day, the stable partial nitrification in the sequencing batch reactor(SBR-PN) was established after 60 d accumulation, with the NH4+ removal efficiency and the nitrite accumulation rate(NAR) were both above 95%(Stage Ⅱ). The two-step feeding strategy(Stage Ⅲ) was used to replace the one-step feeding in the SBR with the aim to reduce the NO2- accumulation and N2O emission. The results showed that the maximum NO2- accumulation and N2O emission were reduced from(16.4±1.6) mg/L and(0.85±0.09) mg/L to(11.4±1.2) mg/L and(0.28±0.04) mg/L, respectively, with the TN removal efficiency of(64.0±2.5)%, the N2O yield decreased from(7.40±0.99)% to(1.33±0.26)%. Based on the selectivity of FNA on AOB and NOB, the coexistence of high NO2- and NH4+ was prevented by two-step feeding strategy of the SBR, which was beneficial to the establishment of partial nitrification and the reduction of N2O emission. PN/PS value increased from 1.42 in stage Ⅰ to 1.77 and 1.74 in stage Ⅱ and Ⅲ, additionally, SVI increased from(113±12) mL/gVSS to(129±15) mL/gVSS in stage Ⅱ and(122±13) mL/gVSS in stage Ⅲ respectively. |
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