Impact of primary treatment methods on sludge characteristics and digestibility, and wastewater treatment plant-wide economics

被引：29

作者：

Abdelrahman, Amr Mustafa ^{[1
,2
]}

Kosar, Sadiye ^{[1
]}

Gulhan, Hazal ^{[1
]}

Cicekalan, Busra ^{[1
]}

Ucas, Gulin ^{[3
]}

Atli, Ezgi ^{[3
]}

Guven, Huseyin ^{[1
]}

Ozgun, Hale ^{[1
,4
]}

Ozturk, Izzet ^{[1
]}

Koyuncu, Ismail ^{[1
,4
]}

van Lier, Jules B. ^{[5
]}

Volcke, Eveline I. P. ^{[2
]}

Ersahin, Mustafa Evren ^{[1
,4
]}

机构：

[1] Istanbul Tech Univ, Civil Engn Fac, Environm Engn Dept, Ayazaga Campus, TR-34469 Istanbul, Turkiye

[2] Univ Ghent, Dept Green Chem & Technol, BioCo Res Grp, Coupure Links 653, B-9000 Ghent, Belgium

[3] Istanbul Water & Sewerage Adm, ISKI, Istanbul, Turkiye

[4] Istanbul Tech Univ, Natl Res Ctr Membrane Technol, Istanbul, Turkiye

[5] Delft Univ Technol, Dept Water management, Sect Sanit Engn, Delft, Netherlands

来源：

WATER RESEARCH | 2023年 / 235卷

关键词：

A-stage; Biochemical methane potential; Chemically enhanced primary treatment; Economic evaluation; Physicochemical characteristics; Primary clarification; ANAEROBIC-DIGESTION; ENERGY RECOVERY; PRIMARY SEDIMENTATION; POTENTIAL BMP; RAPID METHOD; A-STAGE; BIOGAS; STANDARDIZATION; PERFORMANCE; COAGULANT;

D O I：

10.1016/j.watres.2023.119920

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Biogas production from anaerobic sludge digestion plays a central role for wastewater treatment plants to become more energy-efficient or even energy-neutral. Dedicated configurations have been developed to maxi-mize the diversion of soluble and suspended organic matter to sludge streams for energy production through anaerobic digestion, such as A-stage treatment or chemically enhanced primary treatment (CEPT) instead of primary clarifiers. Still, it remains to be investigated to what extent these different treatment steps affect the sludge characteristics and digestibility, which may also impact the economic feasibility of the integrated systems. In this study, a detailed characterization has been performed for sludge obtained from primary clarification (primary sludge), A-stage treatment (A-sludge) and CEPT. The characteristics of all sludges differed significantly from each other. The organic compounds in primary sludge consisted mainly of 40% of carbohydrates, 23% of lipids, and 21% of proteins. A-sludge was characterized by a high amount of proteins (40%) and a moderate amount of carbohydrates (23%), and lipids (16%), while in CEPT sludge, organic compounds were mainly 26% of proteins, 18% of carbohydrates, 18% of lignin, and 12% of lipids. The highest methane yield was obtained from anaerobic digestion of primary sludge (347 +/- 16 mL CH4/g VS) and A-sludge (333 +/- 6 mL CH4/g VS), while it was lower for CEPT sludge (245 +/- 5 mL CH4/g VS). Furthermore, an economic evaluation has been carried out for the three systems, considering energy consumption and recovery, as well as effluent quality and chemical costs. Energy consumption of A-stage was the highest among the three configurations due to aeration energy demand, while CEPT had the highest operational costs due to chemical use. Energy surplus was the highest by the use of CEPT, resulting from the highest fraction of recovered organic matter. By considering the effluent quality of the three systems, CEPT had the highest benefits, followed by A-stage. Integration of CEPT or A-stage, instead of primary clarification in existing wastewater treatment plants, would potentially improve the effluent quality and energy recovery.

引用

页数：12

共 56 条

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