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Waste Manag. 2017 Apr;62:188-193. doi: 10.1016/j.wasman.2017.01.042. Epub 2017 Feb 20.

Effects of total solids content on performance of sludge mesophilic anaerobic digestion and dewaterability of digested sludge.

Author information

1
School of Chemistry and Environmental Engineering, Jiujiang University, Jiujiang 332005, PR China.
2
School of Chemistry and Environmental Engineering, Jiujiang University, Jiujiang 332005, PR China; Jiangxi Province Engineering Research Center of Ecological Chemical Industry, Jiujiang 332005, PR China; Jiujiang Key Laboratory of Basin Management and Ecological Protection, Jiujiang 332005, PR China. Electronic address: gloomysmile@163.com.
3
Beijing Municipal Engineering Professional Design Institute Co., Ltd, Beijing 100037, PR China.
4
College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China.

Abstract

The role of total solids (TS) content on sludge mesophilic anaerobic digestion (AD) was investigated in batch reactors. A range of TS below 10% was evaluated with two replicates. The volumetric biogas production rate (VBPR) increased with increasing initial TS. On day 5, VBPR increased from 133.2±11.2mLL-1d-1 at TS 2% to 1111.7±58.1mLL-1d-1 at TS 10%. The ultimate biogas yield (P) firstly increased and then decreased with the increasing TS. The greatest P was 246.8mLg-1-VSadded at TS 8%. The corresponding free ammonia nitrogen (FAN) and total ammonia nitrogen (TAN) were 84.0±16.1 and 1163.0±108.6mgL-1, respectively. Normalized capillary suction time (NCST) and solid content of thickened sludge obtained by centrifuging sludge increased with increasing TS. On day 49, NCST were 1.2±0.2 (TS=2%) and 13.2±1.1 (TS=10%)sg-1-TS. Meanwhile, solid content of thickened sludge was 7.5±0.5 (TS=2%) and 15.4±0.0% (TS=10%). In summary, high VBPR and dewatering effects were obtained after TS content optimization.

KEYWORDS:

Ammonia; Dewaterability; Extracellularpolymeric substances (EPS); Ultimate biogas yield (P); Volumetric biogas production rate (VBPR)

PMID:
28223078
DOI:
10.1016/j.wasman.2017.01.042
[Indexed for MEDLINE]

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