期刊
BIORESOURCE TECHNOLOGY
卷 275, 期 -, 页码 163-171出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.12.055
关键词
Wastewater treatment plants; Waste activated sludge; Short-chain fatty acids; Ultrasound; Free ammonia
资金
- National Natural Science Foundation of China (NSFC) [51508178, 51779089, 51521006]
- Natural Science Funds of Hunan Province for Distinguished Young Scholar [2018JJ1002]
- Huxiang Youth Talent Plan of Hunan Province [2017RS3022]
- Science and Technology Major Project of Hunan Province, China [2018SK1010]
Ultrasound pretreatment was proved to be effective in accelerating waste activated sludge (WAS) disintegration and promoting anaerobic fermentative short-chain fatty acids (SCFA) production. However, due to the high activities of SCFA consumers, SCFA yield is limited. Herein we reported an efficient strategy, i.e., using free ammonia (FA) to aid ultrasound pretreatment, to enhance SCFA accumulation. Experimental results showed that the greatest SCFA yield of 316.7 +/- 14.9 mg COD/g VSS was obtained at 2 w/mL ultrasound pretreatment for 15 min followed by initial 60 mg/L FA pretreatment for 2 d, which was 2.2 times (1.7 times) of that from sole ultrasound (FA) pretreatment. The mechanism study revealed that this combination method accelerated sludge solubilization, enhanced the release of biodegradable organics, and caused severe inhibitions to SCFA consumption. Moreover, this method has inhibitory effects on specific activities of hydrolytic microorganisms, SCFA-producing bacteria and methanogens, but the inhibitions to methanogens were severe.
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