Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Jiawei Hu; Zhuo Li; Wenquan Tao

doi:10.1021/acssuschemeng.1c07861

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Jiawei Hu
, Zhuo Li
, Wenquan Tao

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

14 Scopus citations

Abstract

This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)₂] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)₂ dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)₂ dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)₂ efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)₂ pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)₂. The two decomposition products of Ca(ClO)₂, Ca(OH)₂ and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)₂ being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)₂ pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)₂-pretreated fermenters, respectively.

Original language	English
Pages (from-to)	2509-2521
Number of pages	13
Journal	ACS Sustainable Chemistry and Engineering
Volume	10
Issue number	7
DOIs	https://doi.org/10.1021/acssuschemeng.1c07861
State	Published - 21 Feb 2022
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

anaerobic fermentation
calcium hypochlorite
hydrogen
micropollutant
waste activated sludge

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10.1021/acssuschemeng.1c07861

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title = "Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge",

abstract = "This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62\% in control and Ca(ClO)2-pretreated fermenters, respectively.",

keywords = "anaerobic fermentation, calcium hypochlorite, hydrogen, micropollutant, waste activated sludge",

author = "Jiawei Hu and Zhuo Li and Wenquan Tao",

note = "Publisher Copyright: {\textcopyright} 2022 American Chemical Society",

year = "2022",

month = feb,

day = "21",

doi = "10.1021/acssuschemeng.1c07861",

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TY - JOUR

T1 - Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

AU - Hu, Jiawei

AU - Li, Zhuo

AU - Tao, Wenquan

PY - 2022/2/21

Y1 - 2022/2/21

N2 - This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively.

AB - This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively.

KW - anaerobic fermentation

KW - calcium hypochlorite

KW - hydrogen

KW - micropollutant

KW - waste activated sludge

UR - https://www.scopus.com/pages/publications/85125084228

U2 - 10.1021/acssuschemeng.1c07861

DO - 10.1021/acssuschemeng.1c07861

M3 - 文章

AN - SCOPUS:85125084228

SN - 2168-0485

VL - 10

SP - 2509

EP - 2521

JO - ACS Sustainable Chemistry and Engineering

JF - ACS Sustainable Chemistry and Engineering

IS - 7

ER -

Calcium Hypochlorite Promotes Dark Fermentative Hydrogen Production from Waste Activated Sludge

Abstract

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Keywords

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