Enhanced anaerobic digestion of refinery waste activated sludge using thermal-refinery spend caustic pretreatment

doi:10.16085/j.issn.1000-6613.2023-0118

Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (12): 6609-6619.DOI: 10.16085/j.issn.1000-6613.2023-0118

• Resources and environmental engineering • Previous Articles

Enhanced anaerobic digestion of refinery waste activated sludge using thermal-refinery spend caustic pretreatment

LI Jin¹(), LIANG Jiahao², MA Wenfeng³, GUO Shaohui¹, WANG Qinghong¹(), CHEN Chunmao¹

^1.State Key Laboratory of Petroleum Pollution Control, China University of Petroleum (Beijing), Beijing 102249, China
^2.Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Key Laboratory of Petrochemical Pollution Control of Guangdong Higher Education Institutes, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China
^3.College of Chemical Engineering, Shandong Institute of Petrochemical Technology, Dongying 257061, Shandong, China

Received:2023-01-31 Revised:2023-02-15 Online:2024-01-08 Published:2023-12-25
Contact: WANG Qinghong

热-碱渣预处理强化炼厂剩余活性污泥厌氧消化性能

李晋¹(), 梁家豪², 马文峰³, 郭绍辉¹, 王庆宏¹(), 陈春茂¹

^1.中国石油大学（北京）化学工程与环境学院，石油石化污染物控制与处理国家重点实验室，北京 102249
^2.广东石油化工学院环境科学与工程学院，广东省石油化工污染过程与控制重点实验室，广东高校石油化工污染控制重点实验室，广东茂名 525000
^3.山东石油化工学院化学工程学院，山东东营 257061

通讯作者: 王庆宏
作者简介:李晋（1993—），男，博士研究生，研究方向为固体废弃物资源化利用。E-mail：lijincup@163.com。
基金资助:
国家重点研发计划(2018YFC1801903-01);国家自然科学基金(22278434);中石油集团前瞻基础研究专项(2021DJ6605);茂名市科技专项资金项目(2022S041);广东石油化工学院人才引进项目(RC-XJ2022000702);东营市科学发展基金(DJB202104)

Abstract

Abstract:

Thermal-alkaline pretreatment is an effective method to improve the anaerobic digestion of waste activated sludge. In order to reduce the cost of treatment process, the refinery spend caustic (RSC) was used instead of fresh alkalis, and the effects of thermal-RSC pretreatment on anaerobic digestion of refinery waste activated sludge (RWAS) were investigated. The results showed that thermal-alkaline pretreatment significantly promoted the solubilization of RWAS, and the concentrations of proteins, polysaccharides and volatile fatty acids (VFA) increased with temperature and RSC dosage increasing, which were 1338.7mg/L, 510.9mg/L and 651.2mg/L at 90℃ with 4% RSC, respectively. Person correlation analysis showed that RSC dosage was positively correlated with fluorescence intensity of humic acids and melanoid production, while had a significantly positive correlation with the stagnation period of anaerobic digestion, which resulted in an inhibition of RWAS anaerobic digestion within high RSC dosages. Eventually, the combination of high temperature and low alkali (90℃, 1%RSC) was preferred. Under this condition, the SCOD degradation rate and maximum VFA production of RWAS by anaerobic digestion were 66% and 736.2mg/L, respectively. The methane (95.3mL/g-VS) and hydrogen (11.5mL/g-VS) production increased 5-fold and 3-fold compared to untreated sludge. Therefore, RWAS anaerobic digestion using thermal-RSC pretreatment has high application potential.

Key words: waste activated sludge, refinery spend caustic, pretreatment, anaerobic digestion, methane

摘要：

热-碱预处理是强化剩余活性污泥厌氧消化的有效手段。为降低处理成本，利用炼厂碱渣替代新鲜碱剂，研究了热-碱渣预处理对炼厂剩余活性污泥（refinery waste activated sludge，RWAS）厌氧消化的影响。结果表明，热-碱渣预处理显著促进了胞内有机物的释放，蛋白质、多糖和挥发性脂肪酸浓度随温度和碱渣剂量的提升而增加，在温度90℃和碱渣剂量4%的条件下，蛋白质、多糖和挥发性脂肪酸分别可达1338.7mg/L、510.9mg/L和651.2mg/L。Person相关性结果表明碱渣剂量对腐殖酸类物质荧光强度和类黑素产量呈正相关，与厌氧消化停滞期呈显著正相关，表明高碱渣剂量会抑制RWAS厌氧消化性能。因此，热-碱渣预处理的最佳工艺条件为温度90℃、碱渣剂量1%。该条件下预处理RWAS厌氧消化的溶解性化学需氧量（SCOD）降解率可达66%，最大产酸量为736.2mg/L，甲烷和氢气产量分别是未处理RWAS的5倍和3倍，分别达95.3mL/g-VS（VS为挥发性固体）和11.5mL/g-VS。综上所述，热-碱渣预处理炼厂剩余活性污泥具有较好的应用前景。

关键词: 剩余活性污泥, 炼厂碱渣, 预处理, 厌氧消化, 甲烷

CLC Number:

X703.1

LI Jin, LIANG Jiahao, MA Wenfeng, GUO Shaohui, WANG Qinghong, CHEN Chunmao. Enhanced anaerobic digestion of refinery waste activated sludge using thermal-refinery spend caustic pretreatment[J]. Chemical Industry and Engineering Progress, 2023, 42(12): 6609-6619.

李晋, 梁家豪, 马文峰, 郭绍辉, 王庆宏, 陈春茂. 热-碱渣预处理强化炼厂剩余活性污泥厌氧消化性能[J]. 化工进展, 2023, 42(12): 6609-6619.

Figures/Tables 9

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检测指标	剩余活性污泥	厌氧种泥
pH	7.23±0.05	6.68±0.15
总化学需氧量（TCOD）/mg·L^-1	19674±818	14190±367
溶解性化学需氧量（SCOD）/mg·L^-1	120±35	102±37
总固体（TS）浓度/mg·L^-1	16614±276	12625±446
挥发性固体（VS）浓度/mg·L^-1	11197±167	8715±177
溶解性蛋白质（PN）浓度/mg·L^-1	4.77±0.22	2.43±0.08
溶解性多糖（PS）浓度/mg·L^-1	23.91±1.85	48.24±3.14
含油量/%	7.50±1.08	0.17±0.08

检测指标	剩余活性污泥	厌氧种泥
pH	7.23±0.05	6.68±0.15
总化学需氧量（TCOD）/mg·L^-1	19674±818	14190±367
溶解性化学需氧量（SCOD）/mg·L^-1	120±35	102±37
总固体（TS）浓度/mg·L^-1	16614±276	12625±446
挥发性固体（VS）浓度/mg·L^-1	11197±167	8715±177
溶解性蛋白质（PN）浓度/mg·L^-1	4.77±0.22	2.43±0.08
溶解性多糖（PS）浓度/mg·L^-1	23.91±1.85	48.24±3.14
含油量/%	7.50±1.08	0.17±0.08

温度/℃	碱渣投加量/%	拟合曲线R²	Y_max/mL·g^-1 VS	R_m/mL·g^-1-VS·d^-1	λ/d
20	0	0.970	19.74	0.979	0.969
	1	0.944	42.55	2.331	0.695
	2	0.991	58.73	4.032	1.494
	3	0.989	66.06	2.890	4.804
	4	0.950	52.24	2.734	9.931
50	0	0.971	35.54	2.023	0
	1	0.972	56.04	4.312	1.529
	2	0.990	74.43	4.575	2.378
	3	0.981	76.25	2.845	3.774
	4	0.954	50.70	2.414	3.720
70	0	0.972	50.04	3.004	0
	1	0.973	80.30	3.515	2.033
	2	0.995	77.80	4.269	7.320
	3	0.966	39.10	1.755	6.047
	4	0.976	34.35	1.474	6.164
90	0	0.988	71.90	5.948	0.423
	1	0.998	100.27	6.039	3.539
	2	0.990	63.00	2.952	8.601
	3	0.951	30.07	1.300	14.308
	4	0.960	18.62	0.901	12.344

温度/℃	碱渣投加量/%	拟合曲线R²	Y_max/mL·g^-1 VS	R_m/mL·g^-1-VS·d^-1	λ/d
20	0	0.970	19.74	0.979	0.969
	1	0.944	42.55	2.331	0.695
	2	0.991	58.73	4.032	1.494
	3	0.989	66.06	2.890	4.804
	4	0.950	52.24	2.734	9.931
50	0	0.971	35.54	2.023	0
	1	0.972	56.04	4.312	1.529
	2	0.990	74.43	4.575	2.378
	3	0.981	76.25	2.845	3.774
	4	0.954	50.70	2.414	3.720
70	0	0.972	50.04	3.004	0
	1	0.973	80.30	3.515	2.033
	2	0.995	77.80	4.269	7.320
	3	0.966	39.10	1.755	6.047
	4	0.976	34.35	1.474	6.164
90	0	0.988	71.90	5.948	0.423
	1	0.998	100.27	6.039	3.539
	2	0.990	63.00	2.952	8.601
	3	0.951	30.07	1.300	14.308
	4	0.960	18.62	0.901	12.344

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Enhanced anaerobic digestion of refinery waste activated sludge using thermal-refinery spend caustic pretreatment

热-碱渣预处理强化炼厂剩余活性污泥厌氧消化性能

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