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Volume 39 Issue 4
Jul.  2021
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(4): 140-146
WEN Hao, YAN Yuting, ZHONG Jiewen, ZHANG Haowen, YIN Hongwei, TIAN Siyu. EFFECT OF BUOY-BEAD MATERIAL ON CHLORELLA VULGARIS HARVESTING PERFORMANCE DURING FLOTATION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(11): 26-31. doi: 10.13205/j.hjgc.202211004
Citation: ZHANG Bo, ZHAO Yi-hua, TAO Jun, JI Min, MA Tong-yu, SHANG Chen. INFLUENCE MECHANISM AND KINETIC STUDY OF CaO PRETREATMENT ON HIGH-SOLID SLUDGE ANAEROBIC DIGESTION PERFORMANCE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 140-146. doi: 10.13205/j.hjgc.202104022
shu

INFLUENCE MECHANISM AND KINETIC STUDY OF CaO PRETREATMENT ON HIGH-SOLID SLUDGE ANAEROBIC DIGESTION PERFORMANCE

doi: 10.13205/j.hjgc.202104022

  • 1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China;

  • 2. Tianjin Eco-City Water Investment and Construction Co., Ltd, Tianjin 300467, China

  • Received Date: 2020-04-29
    Available Online: 2021-07-21
    Abstract
  • To resolve the problem of low hydrolysis rate of high-solid waste activated sludge during anaerobic digestion process, CaO was used to disintegrate high-solid sludge. Physical and chemical characters of sludge before and after alkaline pretreatment were evaluated in terms of particle size, and soluble COD, protein, carbohydrate. Effect of alkaline pretreatment on cumulative methane yield and organism decomposition during high-solid anaerobic digestion process were also studied. The influence mechanism of EPS, cell wall and cell membrane cracking degree on anaerobic digestion performance under different alkali levels were studied. The results indicated that after the CaO pretreatment, the particle size of sludge was hardly changed, and the concentrations of SCOD, soluble protein and carbohydrate showed an obvious increase trend. The disintegration degree increased with the dosage of CaO. After alkaline pretreatment, the cumulative methane yield increased by 22.9%~34.8%. The mechanism discussion results showed that only organic matters in EPS could be released during low-alkali pretreatment, which promoted the cumulative methane yield, while organic matters in EPS and intracellular polymers were both released during high-alkali pretreatment, which led to the increase of cumulative methane yield. Kinetics study results showed that alkaline pretreatment could not only enhance methane yield, but also accelerate the anaerobic digestion and shorten the inhibitory stage.
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    • References(27)
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