Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8: From bench to pilot-scale study

Qianqian Wen; Min Ma; Huijie Hou; Wenbo Yu; Guan Gui; Qiongxiang Wu; Keke Xiao; Yuwei Zhu; Shuangyi Tao; Sha Liang; Bingchuan Liu; Jingping Hu; Jiakuan Yang

doi:10.1016/j.envres.2021.111825

Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe²⁺/H₂O₂, Fe²⁺/Ca(ClO)₂, and Fe²⁺/Na₂S₂O₈: From bench to pilot-scale study

Qianqian Wen, Min Ma, Huijie Hou, Wenbo Yu^*, Guan Gui, Qiongxiang Wu, Keke Xiao, Yuwei Zhu, Shuangyi Tao, Sha Liang, Bingchuan Liu, Jingping Hu, Jiakuan Yang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

Deep dewatering of sewage sludge pretreated with advanced oxidation processes (AOPs) is a strategy for efficient sludge reduction and subsequent disposal. The pretreatment and dewatering performance of sludge conditioned with three types of AOPs (Fe²⁺/H₂O₂, Fe²⁺/Ca(ClO)₂, and Fe²⁺/Na₂S₂O₈), compared with sludge conditioned with traditional conditioner (Fe³⁺/CaO), were investigated in both bench and pilot-scale tests. All of those conditioner systems could reduce the water content of dewatered sludge cake to below 60 wt% in bench-scale (about 16 kg raw sludge per round) and pilot-scale (approximate 800 kg raw sludge per round) diaphragm filter press dewatering. Compared with raw sludge, the deep-dewatering filtrate after different conditioning and dewatering processes had higher ammonia nitrogen (NH₄⁺-N) and chemical oxygen demand (COD) contents due to the degradation of organic matter, and much lower total phosphorus (TP) content due to the formation of iron phosphate precipitate. A better biodegradability (i.e. higher BOD₅/COD ratio) was found in the deep-dewatering filtrate of sludge conditioned with Fe²⁺/H₂O₂ (25.2 %) and Fe²⁺/Ca(ClO)₂ (17.4 %). Most of the heavy metals (Cr, Cu, Ni, and Pb) (>79 wt%) have remained in the dewatered sludge cake, and most of the Cl element (>90 wt%) in the sludge pretreated by Fe²⁺/Ca(ClO)₂ and Fe³⁺/CaO was kept in the filtrate, rather than the dewatered sludge cake. Based on the pilot-scale experimental results, if all the filtrate in the deep-dewatering process returned to the influent of WWTP, the loading ratios of TP, NH₄⁺-N, COD in the four conditioner systems were less than 3 wt%. The above results proved that the AOPs conditioned sludge could achieve deep-dewatering in pilot-scale and the direct recirculation of deep-dewatering filtrate to the influent of wastewater treatment plant was feasible.

Original language	English
Article number	111825
Journal	Environmental Research
Volume	203
DOIs	https://doi.org/10.1016/j.envres.2021.111825
State	Published - Jan 2022
Externally published	Yes

Keywords

Advanced oxidation processes
Chloride and heavy metals
Deep-dewatering
Filtrate recirculation
Waste activated sludge

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Wen, Q., Ma, M., Hou, H., Yu, W., Gui, G., Wu, Q., Xiao, K., Zhu, Y., Tao, S., Liang, S., Liu, B., Hu, J., & Yang, J. (2022). Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe²⁺/H₂O₂, Fe²⁺/Ca(ClO)₂, and Fe²⁺/Na₂S₂O₈: From bench to pilot-scale study. Environmental Research, 203, Article 111825. https://doi.org/10.1016/j.envres.2021.111825

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title = "Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8: From bench to pilot-scale study",

abstract = "Deep dewatering of sewage sludge pretreated with advanced oxidation processes (AOPs) is a strategy for efficient sludge reduction and subsequent disposal. The pretreatment and dewatering performance of sludge conditioned with three types of AOPs (Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8), compared with sludge conditioned with traditional conditioner (Fe3+/CaO), were investigated in both bench and pilot-scale tests. All of those conditioner systems could reduce the water content of dewatered sludge cake to below 60 wt% in bench-scale (about 16 kg raw sludge per round) and pilot-scale (approximate 800 kg raw sludge per round) diaphragm filter press dewatering. Compared with raw sludge, the deep-dewatering filtrate after different conditioning and dewatering processes had higher ammonia nitrogen (NH4+-N) and chemical oxygen demand (COD) contents due to the degradation of organic matter, and much lower total phosphorus (TP) content due to the formation of iron phosphate precipitate. A better biodegradability (i.e. higher BOD5/COD ratio) was found in the deep-dewatering filtrate of sludge conditioned with Fe2+/H2O2 (25.2 %) and Fe2+/Ca(ClO)2 (17.4 %). Most of the heavy metals (Cr, Cu, Ni, and Pb) (>79 wt%) have remained in the dewatered sludge cake, and most of the Cl element (>90 wt%) in the sludge pretreated by Fe2+/Ca(ClO)2 and Fe3+/CaO was kept in the filtrate, rather than the dewatered sludge cake. Based on the pilot-scale experimental results, if all the filtrate in the deep-dewatering process returned to the influent of WWTP, the loading ratios of TP, NH4+-N, COD in the four conditioner systems were less than 3 wt%. The above results proved that the AOPs conditioned sludge could achieve deep-dewatering in pilot-scale and the direct recirculation of deep-dewatering filtrate to the influent of wastewater treatment plant was feasible.",

keywords = "Advanced oxidation processes, Chloride and heavy metals, Deep-dewatering, Filtrate recirculation, Waste activated sludge",

author = "Qianqian Wen and Min Ma and Huijie Hou and Wenbo Yu and Guan Gui and Qiongxiang Wu and Keke Xiao and Yuwei Zhu and Shuangyi Tao and Sha Liang and Bingchuan Liu and Jingping Hu and Jiakuan Yang",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Inc.",

year = "2022",

month = jan,

doi = "10.1016/j.envres.2021.111825",

language = "英语",

volume = "203",

journal = "Environmental Research",

issn = "0013-9351",

publisher = "Academic Press Inc.",

}

Wen, Q, Ma, M, Hou, H, Yu, W, Gui, G, Wu, Q, Xiao, K, Zhu, Y, Tao, S, Liang, S, Liu, B, Hu, J & Yang, J 2022, 'Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe²⁺/H₂O₂, Fe²⁺/Ca(ClO)₂, and Fe²⁺/Na₂S₂O₈: From bench to pilot-scale study', Environmental Research, vol. 203, 111825. https://doi.org/10.1016/j.envres.2021.111825

Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe²⁺/H₂O₂, Fe²⁺/Ca(ClO)₂, and Fe²⁺/Na₂S₂O₈: From bench to pilot-scale study. / Wen, Qianqian; Ma, Min; Hou, Huijie et al.
In: Environmental Research, Vol. 203, 111825, 01.2022.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Recirculation of reject water in deep-dewatering process to influent of wastewater treatment plant and dewaterability of sludge conditioned with Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8

T2 - From bench to pilot-scale study

AU - Wen, Qianqian

AU - Ma, Min

AU - Hou, Huijie

AU - Yu, Wenbo

AU - Gui, Guan

AU - Wu, Qiongxiang

AU - Xiao, Keke

AU - Zhu, Yuwei

AU - Tao, Shuangyi

AU - Liang, Sha

AU - Liu, Bingchuan

AU - Hu, Jingping

AU - Yang, Jiakuan

PY - 2022/1

Y1 - 2022/1

N2 - Deep dewatering of sewage sludge pretreated with advanced oxidation processes (AOPs) is a strategy for efficient sludge reduction and subsequent disposal. The pretreatment and dewatering performance of sludge conditioned with three types of AOPs (Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8), compared with sludge conditioned with traditional conditioner (Fe3+/CaO), were investigated in both bench and pilot-scale tests. All of those conditioner systems could reduce the water content of dewatered sludge cake to below 60 wt% in bench-scale (about 16 kg raw sludge per round) and pilot-scale (approximate 800 kg raw sludge per round) diaphragm filter press dewatering. Compared with raw sludge, the deep-dewatering filtrate after different conditioning and dewatering processes had higher ammonia nitrogen (NH4+-N) and chemical oxygen demand (COD) contents due to the degradation of organic matter, and much lower total phosphorus (TP) content due to the formation of iron phosphate precipitate. A better biodegradability (i.e. higher BOD5/COD ratio) was found in the deep-dewatering filtrate of sludge conditioned with Fe2+/H2O2 (25.2 %) and Fe2+/Ca(ClO)2 (17.4 %). Most of the heavy metals (Cr, Cu, Ni, and Pb) (>79 wt%) have remained in the dewatered sludge cake, and most of the Cl element (>90 wt%) in the sludge pretreated by Fe2+/Ca(ClO)2 and Fe3+/CaO was kept in the filtrate, rather than the dewatered sludge cake. Based on the pilot-scale experimental results, if all the filtrate in the deep-dewatering process returned to the influent of WWTP, the loading ratios of TP, NH4+-N, COD in the four conditioner systems were less than 3 wt%. The above results proved that the AOPs conditioned sludge could achieve deep-dewatering in pilot-scale and the direct recirculation of deep-dewatering filtrate to the influent of wastewater treatment plant was feasible.

AB - Deep dewatering of sewage sludge pretreated with advanced oxidation processes (AOPs) is a strategy for efficient sludge reduction and subsequent disposal. The pretreatment and dewatering performance of sludge conditioned with three types of AOPs (Fe2+/H2O2, Fe2+/Ca(ClO)2, and Fe2+/Na2S2O8), compared with sludge conditioned with traditional conditioner (Fe3+/CaO), were investigated in both bench and pilot-scale tests. All of those conditioner systems could reduce the water content of dewatered sludge cake to below 60 wt% in bench-scale (about 16 kg raw sludge per round) and pilot-scale (approximate 800 kg raw sludge per round) diaphragm filter press dewatering. Compared with raw sludge, the deep-dewatering filtrate after different conditioning and dewatering processes had higher ammonia nitrogen (NH4+-N) and chemical oxygen demand (COD) contents due to the degradation of organic matter, and much lower total phosphorus (TP) content due to the formation of iron phosphate precipitate. A better biodegradability (i.e. higher BOD5/COD ratio) was found in the deep-dewatering filtrate of sludge conditioned with Fe2+/H2O2 (25.2 %) and Fe2+/Ca(ClO)2 (17.4 %). Most of the heavy metals (Cr, Cu, Ni, and Pb) (>79 wt%) have remained in the dewatered sludge cake, and most of the Cl element (>90 wt%) in the sludge pretreated by Fe2+/Ca(ClO)2 and Fe3+/CaO was kept in the filtrate, rather than the dewatered sludge cake. Based on the pilot-scale experimental results, if all the filtrate in the deep-dewatering process returned to the influent of WWTP, the loading ratios of TP, NH4+-N, COD in the four conditioner systems were less than 3 wt%. The above results proved that the AOPs conditioned sludge could achieve deep-dewatering in pilot-scale and the direct recirculation of deep-dewatering filtrate to the influent of wastewater treatment plant was feasible.

KW - Advanced oxidation processes

KW - Chloride and heavy metals

KW - Deep-dewatering

KW - Filtrate recirculation

KW - Waste activated sludge

UR - http://www.scopus.com/inward/record.url?scp=85112022582&partnerID=8YFLogxK

U2 - 10.1016/j.envres.2021.111825

DO - 10.1016/j.envres.2021.111825

M3 - 文章

C2 - 34364865

AN - SCOPUS:85112022582

SN - 0013-9351

VL - 203

JO - Environmental Research

JF - Environmental Research

M1 - 111825

ER -