Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios

Suyun Xu; Chongyang Wang; Yangyang Sun; Liwen Luo; Jonathan W C Wong

doi:10.1016/j.wasman.2020.07.003

Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios

Suyun Xu^*, Chongyang Wang, Yangyang Sun, Liwen Luo, Jonathan W C Wong^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

22 Citations (Scopus)

Abstract

This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VS_rem was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.

Original language	English
Pages (from-to)	299-306
Number of pages	8
Journal	Waste Management
Volume	114
DOIs	https://doi.org/10.1016/j.wasman.2020.07.003
Publication status	Published - 1 Aug 2020

User-Defined Keywords

Co-digestion
Free ammonium nitrogen
Methane production
Pig manure
Propionic acid
Sewage sludge

Access to Document

10.1016/j.wasman.2020.07.003

Cite this

@article{c577129ec45344979fb5882ea108777d,

title = "Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios",

abstract = "This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VSrem was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.",

keywords = "Co-digestion, Free ammonium nitrogen, Methane production, Pig manure, Propionic acid, Sewage sludge",

author = "Suyun Xu and Chongyang Wang and Yangyang Sun and Liwen Luo and Wong, {Jonathan W C}",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (51978595). ",

year = "2020",

month = aug,

day = "1",

doi = "10.1016/j.wasman.2020.07.003",

language = "English",

volume = "114",

pages = "299--306",

journal = "Waste Management",

issn = "0956-053X",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios

AU - Xu, Suyun

AU - Wang, Chongyang

AU - Sun, Yangyang

AU - Luo, Liwen

AU - Wong, Jonathan W C

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (51978595).

PY - 2020/8/1

Y1 - 2020/8/1

N2 - This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VSrem was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.

AB - This study assessed the digester stability and overall methane production of co-digestion of sewage sludge (SS) and pig manure (PM). Four different ratios of PM were mixed with SS to reach different final concentrations of total solids (TS), i.e. 4%, 6%, 8% and 10%. Volatile solids (VS) reduction rate decreased along with an increase in TS%, and the maximum cumulative methane yield of 342 mL/g VSrem was obtained in treatment with TS of 6%. When TS was ≥ 8%, accumulation of volatile fatty acids (VFAs), free ammonium nitrogen (FAN) and total ammonium nitrogen (TAN) were observed. At a TS content of 10%, VFAs accumulated to > 20000 mg/L and the highest FAN was 481 mg/L. The suppression of methanogenesis was negatively correlated with FAN and VFA/TIC (P < 0.05). Co-digestion demonstrated to be an effective way to improve the methane yield from SS due to the enriched biodegradable organic substance and more balanced C/N ratio by incorporating PM.

KW - Co-digestion

KW - Free ammonium nitrogen

KW - Methane production

KW - Pig manure

KW - Propionic acid

KW - Sewage sludge

UR - http://www.scopus.com/inward/record.url?scp=85087963913&partnerID=8YFLogxK

U2 - 10.1016/j.wasman.2020.07.003

DO - 10.1016/j.wasman.2020.07.003

M3 - Journal article

C2 - 32683245

AN - SCOPUS:85087963913

SN - 0956-053X

VL - 114

SP - 299

EP - 306

JO - Waste Management

JF - Waste Management

ER -

Assessing the stability of co-digesting sewage sludge with pig manure under different mixing ratios

Abstract

User-Defined Keywords

Access to Document

Other files and links

Fingerprint

Cite this