Performance of aerobic granular sludge in treatment of gas field produced water

doi:10.19965/j.cnki.iwt.2025-0106

Abstract

Abstract:

Gas field produced water was commonly treated by reinjection, reuse, and surface discharge. With the tightening of reinjection policies in provinces such as Sichuan, it was urgent to develop cost-effective and efficient treatment technologies for surface discharge. Considering the high salinity and significant fluctuations of produced water, aerobic granular sludge (AGS) with strong stress resistance was used for treatment. The actual produced water used in this study was obtained from a certain zone in Sichuan, with chemical oxygen demand (COD), ammonia nitrogen (NH₄ ⁺-N), total nitrogen (TN), and total dissolved solids (TDS) of 1 510, 151.7, 166.0, and 27 431.1 mg/L, respectively. A sequencing batch reactor was inoculated with mature AGS and operated continuously for 70 days. It was found that AGS could maintain a compact granular structure (SVI₃₀<35 mL/g, SVI₃₀/SVI₅=1.0, D ₅₀>880 μm) and effectively remove pollutants. Under the organic loading (COD) of 0.9 kg/(m³·d), COD removal efficiency maintained above 80%, NH₄ ⁺-N removal efficiency was 27.0%-56.1%, and TN removal efficiency was 33.3%-59.5%. The limited nitrogen removal was primarily due to the inhibited growth of nitrifying bacteria. EPS analysis revealed that the PN/PS ratio remained at 1.6-1.8, which was consistent with granule stability. Biodiversity analysis indicated that bacterial genera such as Corynebacterium, Aequorivita, Stappia, Xanthomarina, Paracoccus, and Nitratireductor, were dominant functional bacterial communities that played key roles in maintaining particle structure stability and pollutant removal.

Key words: aerobic granular sludge, oil and gas field, produced water, hypersaline wastewater, simultaneous nitrogen and carbon removal

摘要：

气田采出水常采用回注、回用及达标外排方式处理，随四川等地回注政策收紧，亟需开发低成本、高效达标的外排处理技术。鉴于采出水盐度高、水质波动大等特点，采用抗逆性强的好氧颗粒污泥（AGS）工艺进行处理。实际气田采出水来自四川某区块，化学需氧量（COD）、氨氮（NH₄ ⁺-N）、总氮（TN）、总溶解性固体（TDS）分别为1 510、151.7、166.0、27 431.1 mg/L。接种成熟AGS启动序批式反应器并连续运行70 d，发现AGS可以维持致密的颗粒结构（SVI₃₀<35 mL/g，SVI₃₀/SVI₅=1.0，D ₅₀>880 μm）并有效去除污染物，在有机负荷（COD）为0.9 kg/（m³·d）时，COD去除率稳定在80%以上，NH₄ ⁺-N去除率为27.0%~56.1%，TN去除率为33.3%~59.5%，脱氮能力受限可能是由于硝化菌生长受限导致。胞外聚合物（EPS）分析发现，胞外蛋白/胞外多糖（PN/PS）稳定在1.6~1.8，与颗粒稳定性相一致。生物多样性分析表明，Corynebacterium、Aequorivita、Stappia、Xanthomarina、Paracoccus及Nitratireductor等为优势功能菌群，在维持颗粒结构稳定与污染物去除中发挥关键作用。

关键词: 好氧颗粒污泥, 油气田, 采出水, 高盐废水, 同步脱氮除碳

CLC Number:

X741
X703

Liqi CHEN, Xushen HAN, Yan JIN, Jianguo YU. Performance of aerobic granular sludge in treatment of gas field produced water[J]. Industrial Water Treatment, 2026, 46(1): 60-66.

陈立颀, 韩昫身, 金艳, 于建国. 好氧颗粒污泥处理气田采出水效能研究[J]. 工业水处理, 2026, 46(1): 60-66.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2025-0106

https://www.iwt.cn/EN/Y2026/V46/I1/60

Figures/Tables 8

References 19

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批次	pH	TDS/（mg·L^-1）	氨氮/（mg·L^-1）	硝态氮/（mg·L^-1）	亚硝态氮/（mg·L^-1）	COD/（mg·L^-1）	TOC/（mg·L^-1）
第一批	8.2	28 454.2	140.0	56.2	0.3	1 580	452
第二批	8.1	27 431.1	151.7	14.2	0.1	1 510	507

批次	pH	TDS/（mg·L^-1）	氨氮/（mg·L^-1）	硝态氮/（mg·L^-1）	亚硝态氮/（mg·L^-1）	COD/（mg·L^-1）	TOC/（mg·L^-1）
第一批	8.2	28 454.2	140.0	56.2	0.3	1 580	452
第二批	8.1	27 431.1	151.7	14.2	0.1	1 510	507

第二批进水		第二批出水
有机物成分	质量分数/%	有机物成分	质量分数/%
甲基二苄胺	30.2	2，4-二羟基-3-甲基苯甲醛	10.4
正十七烷	5.9	2，3-环戊烯并吡啶	4.7
苯甲醛	4.6	2-（环丙基甲基）苯胺	4.2
正十八烷	4.3	2-环丙基苯胺	4.2
N，N-二甲基苄胺	4.0	2-甲基-5-（1-甲基乙烯基）吡啶	3.9
正十九烷	3.6	1-甲基-1，2，3，4-四氢喹啉	3.7
正十六烷	3.4	2-（1-甲基环丙基）苯胺	3.1
2，3，6-三甲基吡啶	3.0	2，6-二羟基苯乙酮	3.0
正十五烷	2.4	5，6，7，8-四氢-3-甲基异喹啉	2.8
正二十烷	2.4	2，3，5-三甲基吡啶	2.6

第二批进水		第二批出水
有机物成分	质量分数/%	有机物成分	质量分数/%
甲基二苄胺	30.2	2，4-二羟基-3-甲基苯甲醛	10.4
正十七烷	5.9	2，3-环戊烯并吡啶	4.7
苯甲醛	4.6	2-（环丙基甲基）苯胺	4.2
正十八烷	4.3	2-环丙基苯胺	4.2
N，N-二甲基苄胺	4.0	2-甲基-5-（1-甲基乙烯基）吡啶	3.9
正十九烷	3.6	1-甲基-1，2，3，4-四氢喹啉	3.7
正十六烷	3.4	2-（1-甲基环丙基）苯胺	3.1
2，3，6-三甲基吡啶	3.0	2，6-二羟基苯乙酮	3.0
正十五烷	2.4	5，6，7，8-四氢-3-甲基异喹啉	2.8
正二十烷	2.4	2，3，5-三甲基吡啶	2.6

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