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Thermal pretreatment to enhance biogas production of waste aerobic granular sludge with and without calcium phosphate precipitates

Thermal pretreatment to enhance biogas production of waste aerobic granular sludge with and without calcium phosphate precipitates
Thermal pretreatment to enhance biogas production of waste aerobic granular sludge with and without calcium phosphate precipitates
To develop aerobic granules based sustainable wastewater treatment, it is necessary to view wastewater treatment process and excess sludge treatment as a whole to evaluate resource recovery and sustainability. We thus investigated in this study how mineral characteristics of aerobic granules with/without calcium phosphate precipitates for phosphorus removal in treatment process affect the excess sludge digestion for energy recovery. Steam explosion at 170 C as an effective thermal sludge treatment approach was studied in parallel with normal thermal treatment in an autoclave at 70, 100 and 125 C, respectively. A liner relationship was found between the thermal treatment temperature in the autoclave and biogas production of aerobic granules. The untreated granules with only 10% mineral content (G1) generated 30% more biogas than the untreated granules with 39% mineral content (G2), but steam explosion
is more effective to G2 with high mineral content and relatively poor methane yield potential. In
addition, steam explosion improved methane production from G2 more compared with activated sludge although both untreated activated sludge and G2 had comparable methane production, i.e. around 0.235 L CH4/g VS. Therefore, steam explosion is potential to be used to increase methane production especially when the untreated granular sludge has low methane yield due to high mineral content. This work provides a good basis for a holistic evaluation of resource recovery based on aerobic granular sludge, i.e. combined energy recovery and phosphorus removal and recovery via CaP precipitates, and trade-off between different factors with steam explosion.
Aerobic granules, Steam explosion, biogas production, clacium phosphate, phosphorus removal and recovery, biomineralization
0045-6535
725-732
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Nilsen, Paal
fe8d685b-4867-4c08-b252-d068f80d6ad3
Maulidiany, Nopa, Dwi
aa65ee7d-0ec5-40a0-9304-b85486580475
Liu, Yongqiang
75adc6f8-aa83-484e-9e87-6c8442e344fa
Nilsen, Paal
fe8d685b-4867-4c08-b252-d068f80d6ad3
Maulidiany, Nopa, Dwi
aa65ee7d-0ec5-40a0-9304-b85486580475

Liu, Yongqiang, Nilsen, Paal and Maulidiany, Nopa, Dwi (2019) Thermal pretreatment to enhance biogas production of waste aerobic granular sludge with and without calcium phosphate precipitates. Chemosphere, 234, 725-732. (doi:10.1016/j.chemosphere.2019.06.104).

Record type: Article

Abstract

To develop aerobic granules based sustainable wastewater treatment, it is necessary to view wastewater treatment process and excess sludge treatment as a whole to evaluate resource recovery and sustainability. We thus investigated in this study how mineral characteristics of aerobic granules with/without calcium phosphate precipitates for phosphorus removal in treatment process affect the excess sludge digestion for energy recovery. Steam explosion at 170 C as an effective thermal sludge treatment approach was studied in parallel with normal thermal treatment in an autoclave at 70, 100 and 125 C, respectively. A liner relationship was found between the thermal treatment temperature in the autoclave and biogas production of aerobic granules. The untreated granules with only 10% mineral content (G1) generated 30% more biogas than the untreated granules with 39% mineral content (G2), but steam explosion
is more effective to G2 with high mineral content and relatively poor methane yield potential. In
addition, steam explosion improved methane production from G2 more compared with activated sludge although both untreated activated sludge and G2 had comparable methane production, i.e. around 0.235 L CH4/g VS. Therefore, steam explosion is potential to be used to increase methane production especially when the untreated granular sludge has low methane yield due to high mineral content. This work provides a good basis for a holistic evaluation of resource recovery based on aerobic granular sludge, i.e. combined energy recovery and phosphorus removal and recovery via CaP precipitates, and trade-off between different factors with steam explosion.

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Accepted/In Press date: 13 June 2019
e-pub ahead of print date: 14 June 2019
Published date: November 2019
Keywords: Aerobic granules, Steam explosion, biogas production, clacium phosphate, phosphorus removal and recovery, biomineralization

Identifiers

Local EPrints ID: 432370
URI: http://eprints.soton.ac.uk/id/eprint/432370
ISSN: 0045-6535
PURE UUID: 00f74803-9bb5-4e15-bd69-98ad0f95ad19

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Date deposited: 11 Jul 2019 16:30
Last modified: 07 Oct 2020 04:17

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