Page 185 - 《精细化工》2021年第8期

第 38 卷第 8 期 精 细 化 工 Vol.38, No.8
202 1 年 8 月 FINE CHEMICALS Aug. 2021

水处理技术与环境保护
碱度及外投碳源浓度对好氧颗粒污泥脱氮效果影响

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曾敏静，张斌超，曾 玉，黄思浓，程媛媛，龙 焙
（江西理工大学 土木与测绘工程学院，江西 赣州 341000）

摘要：为实现稀土矿山废水高效脱氮，探索了不同碱度和外投碳源下好氧颗粒污泥（AGS）对模拟离子型稀土
矿山废水的脱氮效果。当水中碱度≤2 mmol/L 时，pH 与碱度近似呈线性关系，当水中碱度>2 mmol/L 后 pH 几
乎不再变化。硝化反应会消耗大量碱度，进而影响 AGS 的硝化效果及硝化反应的持续性。随着碱度的增大（2~
13 mmol/L），硝化液出水 pH 呈增大趋势（6.2~8.4），氨氮呈减小趋势（79.2~19.2 mg/L），硝化反应持续时间延
长（50~150 min）。当碱度为 9.5 mmol/L 时，反应前后 pH 保持在 8 以上，氨氮去除率达到最大值（80.9%），硝
化反应可持续 140 min，更高的碱度并不会进一步提高氨氮去除率。外投碳源会导致硝化液 pH 升高并可强化
AGS 的反硝化效果，但当外投碳源质量浓度大于 280 mg/L（以乙酸钠的化学需氧量计）时，总无机氮（TIN）
的去除率约为 71.6%。碱度和外投碳源对 AGS 的同步硝化反硝化效果有重要影响，当碳源质量浓度和碱度分
别在 280 mg/L 和 8 mmol/L 以上时，TIN 的去除率大于 85%。AGS 的内源硝化-反硝化脱氮能力一般，但与外源
硝化-反硝化相耦合可降低外投碳源量，具有较好的节能降耗潜力。
关键词：好氧颗粒污泥；碱度；碳源；硝化；反硝化；同步硝化-反硝化；水处理技术
中图分类号：X703.1 文献标识码：A 文章编号：1003-5214 (2021) 08-1679-07

Effects of alkalinity and external carbon source concentration on
denitrification efficiency of aerobic granular sludge

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ZENG Minjing, ZHANG Binchao, ZENG Yu, HUANG Sinong, CHENG Yuanyuan, LONG Bei
（School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou
341000, Jiangxi, China）

Abstract: To achieve efficient nitrogen removal of rare earth mine wastewater, effects of alkalinity and
external carbon sources on denitrification of simulated ionic rare earth mine wastewater by aerobic granular
sludge (AGS) were explored. When alkalinity of the solution was less than 2 mmol/L, pH and alkalinity
showed an approximately linear relationship, while alkalinity was larger than 2 mmol/L, pH was almost
unchangeable. Nitrification would consume a large amount of alkalinity, which affected the ammonia nitrogen
removal efficiency of AGS and the sustainability of nitrification reaction. With the increase of alkalinity
(2~13 mmol/L), effluent pH of the nitrification solution showed an increasing trend (6.2~8.4), effluent
ammonia nitrogen showed a decreasing trend (79.2~19.2 mg/L), and duration of nitrification reaction
extended from 50 to 150 min. When alkalinity was 9.5 mmol/L, pH before and after the reaction was
always larger than 8, the removal rate of ammonia nitrogen reached the maximum value of 80.9%, and the
nitrification reaction lasted for 140 min. A higher alkalinity would not further improve the removal rate of
ammonia nitrogen. The external carbon source would lead to the increase of the pH of the nitrification
solution and enhance the denitrification efficiency of AGS. However, when the mass concentration of
external carbon source (calculated by chemical oxygen demand of sodium acetate) was greater than 280
mg/L, the removal rate of total inorganic nitrogen (TIN) was about 71.6%. Alkalinity and external carbon
source had an important influence on simultaneous nitrification and denitrification performance of AGS.
When the mass concentration of carbon source and alkalinity were larger than 280 mg/L and 8 mmol/L,

收稿日期：2021-02-04; 定用日期：2021-04-25; DOI: 10.13550/j.jxhg.20210140
基金项目：国家自然科学基金资助项目（52060007）；江西省教育厅科技项目（GJJ190502）；江西省自然科学基金青年基金项目
（20181BAB216026）；2019 年江西理工大学创业实践项目（DC2019-013）
作者简介：曾敏静（1998—），男，硕士生，E-mail：836298052@qq.com。联系人：龙 焙（1986—），男，副教授，E-mail：
17770132146@189.cn。