QINHai-guang,ZHANGJun,BAOYu,et al.Screening of an Acid-resistant Yeast Strain for Enhancement of Sludge Bioleaching Pretreatment[J].China Water & Wastewater,2022,38(9):94-99.
Click Copy

Screening of an Acid-resistant Yeast Strain for Enhancement of Sludge Bioleaching Pretreatment

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第9期 Page: 94-99 Column: Date of publication: 2022-05-01
Author(s):
QIN　Hai-guang1; 2; 3;  ZHANG　Jun1; 2; 3;  BAO　Yu1; 2; 3;  WANG　Dun-qiu1; 2; 3;  ZHANG　Hua1; 2; 3;  SUN　Xiao-jie1; 2; 3
（1. College of Environmental Science and Engineering， Guilin University of Technology， Guilin 541004， China； 2. Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology， Guilin University of Technology， Guilin 541004， China； 3. Collaborative Innovation Center for Water Polution Control and Water Safety in Karst Area， Guilin University of Technology，Guilin 541004， China）
Keywords:
acid-resistant yeast;  bioleaching;  urban sludge;  dewatering
Abstract:
The toxic effect of water?soluble organic compounds on Thiobacillus leads to the decrease of its bioleaching efficiency.The physiological and biochemical characteristics of the acid-resistant yeast were investigated, and its feasibility for enhancing the bioleaching pretreatment of sludge was verified. The strain BJ-1 belongs to Erythemyces, and its suitable temperature and pH range were 28-30 ℃ and 3.0-7.0, respectively, indicating that yeast BJ-1 is a moderate temperature and acid-resistant bacterium. When the initial concentration of yeast BJ-1 was 1×106 CFU/mL, the bioleaching process could be accelerated, and the dewatering performance of the leached sludge could be improved by 5-6 times. After the treatment, the sedimentation rate of the sludge increased by 3.1 times, the capillary suction time was shortened by 51%, and the sludge specific resistance decreased to less than 1.0×1012 m/kg. The best dewatering performance was obtained when the leaching time was 2 days.
Last Update: 2022-05-01