Effect of pre-heating on bio-drying of citric acid dewatered sludge in winter
ZHANG Chen1, LI Yang-yang1, DONG Li-ming1, WANG Jin-wei2, LIU Yan-feng1, YU Zhan-qiu1
1. Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China;
2. Weifang Ensign Industry Co., Ltd, Weifang 261000, China
The effects and mechanism of dewatered sludge bio-drying from citric acid production were studied by preheating sludge ranged from 15℃ to 30℃ in winter. Water content of preheating sludge to 20℃ decreased from initial 70% to the final 34.80% after 14d period of bio-drying. The highest temperature reached 57℃ and the period of high temperature remained 5.5d. Compared to the removal rates of bound water between 44.39% and 49.35% in other preheating groups, the group of preheating to 20℃ had much higher rate with 65.58%. It was indicated from the analysis of energy balance that the group of preheating to 25℃ had the maximum bio-energy while 82.62% of total energy was consumed on the water evaporation for the group of preheating to 20℃ with the highest energy utilization efficiency. Through the analysis of protein and polysaccharide in sludge extracellular polymer, the ratios of protein and polysaccharide in LB-EPS and TB-EPS had significant positive correlations with sludge bound water. And the contents of protein in Slime-EPS、LB-EPS、EP-EPS reduced significantly. It suggested that the decomposition of protein should be the main mechanism of heat generating and sludge dewatering for the citric acid dewatered sludge bio-drying.
Nasution A C, Kristanto G A. The effect of mixing ratio variation of sludge and organic solid waste on biodrying process[C]//IOP Conference Series:Earth and Environmental Science. IOP Conference Series:Earth and Environmental Science, doi:10.1088/1755-1315/106/1/012117.
[2]
Hao Z, Yang B, Jahng D. Spent coffee ground as a new bulking agent for accelerated biodrying of dewatered sludge[J]. Water Research, 2018,138:250-263.
[3]
王逸贤.厌氧消化污泥生物干化技术及其产物评价[J]. 净水技术, 2017,36(6):65-70. Wang Y X. Technology of Anaerobically digested sludge biodrying and evaluation of the products[J]. Water Purification Technology. 2017,36(6):65-70.
[4]
Guerrero L, Montalvo S, Huiliñir C, et al. Biodrying of sewage sludge:kinetics of volatile solids degradation under different initial moisture contents and air-flow rates[J]. Bioresource Technology, 2014,174:33-41.
[5]
Somsai K, Tondee T, Kerdsuwan S. Effect of airflow on moisture removal of rotary biodrying reactors[J]. Jurnal Teknologi (Sciences & Engineering), 2016,78(5/6):57-63.
[6]
Yang B Q, Zhang L, Jahng D. Importance of initial moisture content and bulking agent for biodrying sewage sludge[J]. Drying Technology, 2014,32(2):135-144.
[7]
Yuan J, Zhang D, Li Y, et al. Effects of adding bulking agents on biostabilization and drying of municipal solid waste[J]. Waste Management, 2017,62:52-60.
[8]
Yuan D Q, Wang Y L, Feng J. Contribution of stratified extracellular polymeric substances to the gel-like and fractal structures of activated sludge[J]. Water Research, 2014,56(6):56-65.
[9]
Wu Z Y, Cai L, Krafft T, et al. Biodrying performance and bacterial community structure under variable and constant aeration regimes during sewage sludge biodrying[J]. Drying Technology, 2017,36(10):84-92.
[10]
Zhao L, Gu W M, Shao L M, et al. Sludge bio-drying process at low ambient temperature:effect of bulking agent particle size and controlled temperature[J]. Drying Technology, 2012,30(10):1037-1044.
[11]
Song X, Ma J, Gao J D, et al. Optimization of bio-drying of kitchen waste:inoculation, initial moisture content and bulking agents[J]. Journal of Material Cycles and Waste Management, 2017,1(19):496-504.
[12]
Mäkelä M, Edler J, Geladi P. Low-temperature drying of industrial biosludge with simulated secondary heat[J]. Applied Thermal Engineering, 2017,116:792-798.
[13]
Nouha K, Kumar R S, Balasubramanian S, et al. Critical review of EPS production, synthesis and composition for sludge flocculation[J]. Journal of Environmental Sciences, 2017:S100107421631227X.
[14]
Xing Y, Wang Z, Hong C, et al. Mechanism and parameter optimization of fenton's reagent integrated with surfactant pretreatment to improve sludge dewaterability[J]. Plos One, 2017, 12(1):1-14.
[15]
Kristanto G A, Hanany I. Effect of air-flow on biodrying method of municipal solid waste in Indonesia[C]. International Conference on Construction and Building Engineering, 2017:1-18.
[16]
赵卫兵.封闭仓式污泥动态生物干化的机理与应用研究[D]. 合肥:合肥工业大学, 2015. Zhao W B. Research on mechanism and application of dynamic bio-drying for municipal sludge in tunnel reactor[D]. Hefei:Hefei University of Technology, 2015.
[17]
霍敏波,郑冠宇,梁剑茹,等.生物沥浸处理中微生物菌群和胞外聚合物对城市污泥脱水性能的影响[J]. 环境科学学报, 2014,34(9):2199-2204. Huo M B, Zheng G Y, Liang J R, et al. Influence of microbial flora and extracellular plyometric substances on municipal sewage sludge dewaterability enhanced by bioleaching process[J]. Acta Scientiae Circumstantiae. 2014,34(9):2199-2204.
[18]
More T T, Yadav J S, Yan S, et al. Extracellular polymeric substances of bacteria and their potential environmental applications[J]. Journal of Environmental Management, 2014,144(144):1-25.
[19]
Yuan J, Zhang D, Li Y, et al. Effects of the aeration pattern, aeration rate, and turning frequency on municipal solid waste biodrying performance[J]. Journal of Environmental Management, 2018,218:416-424.
[20]
Liu T, Cui C, He J, et al. Effect of different bulking agents on water variation and thermal balance and their respective contribution to bio-generated heat during long-term storage sludge biodrying process[J]. Environmental Science & Pollution Research, 2018,25(18):1-9.
[21]
Velis C A, Longhurst P J, Drew G H, et al. Biodrying for mechanical-biological treatment of wastes:A review of process science and engineering[J]. Bioresour Technol, 2009,100(11):2747-2761.
[22]
Zhao L, Gu W, He P, et al. Effect of air-flow rate and turning frequency on bio-drying of dewatered sludge[J]. Water Research, 2010,44(20):6144-6152.
[23]
Yang B, Jahng D. Repeated Batch-Fed Bioevaporation of Food Waste Using Biofilm-Developed Sponge[J]. Drying Technology, 2016,34(1):76-91.
[24]
Zhang J Y, Cai X, Qi L, et al. Effects of aeration strategy on the evolution of dissolved organic matter (DOM) and microbial community structure during sludge bio-drying[J]. Applied Microbiology and Biotechnology, 2015,99(17):7321-7331.
[25]
Huiliñir C, Villegas M. Biodrying of pulp and paper secondary sludge:Kinetics of volatile solids biodegradation[J]. Bioresource Technology, 2014,157:206-213.
[26]
Cai L, Chen T B, Gao D, et al. Bacterial communities and their association with the bio-drying of sewage sludge[J]. Water Research, 2016,90(90):44-51.
[27]
Cai L, Chen T B, Gao D, et al. Influence of forced air volume on water evaporation during sewage sludge bio-drying[J]. Water Research, 2013,47(13):4767-4773.
[28]
Zhang H, Lu X, Song L, et al. Effects of loosely bound EPS release and floc reconstruction on sludge dewaterability[J]. Water Air & Soil Pollution, 2018,229(2):27.
[29]
Kerch G. Distribution of tightly and loosely bound water in biological macromolecules and age-related diseases[J]. International Journal of Biological Macromolecules, 2018,118(Part A):1310-1318.
[30]
袁京,张地方,李赟,等.外加碳源对厨余垃圾生物干化效果的影响[J]. 中国环境科学, 2017,37(2):628-635. Yuan J, Zhang D F, Li Y, et al. Effect of external carbon sources on biodrying of kitchen waste[J]. China Environmental Science, 2017, 37(2):628-635.
[31]
Huiliñir C, Villegas M. Simultaneous effect of initial moisture content and airflow rate on biodrying of sewage sludge[J]. Water Research, 2015,82:118-128.
[32]
Lei F, Vandergheynst J S. The effect of microbial inoculation and pH on microbial community structure changes during composting[J]. Process Biochemistry, 2000,35(9):923-929.
[33]
李影影,董黎明,李梦娅,等.固体浓度及上清液有机物对柠檬酸污泥pH缓冲容量的影响[J]. 环境化学, 2018,37(3):584-590. Li Y Y, Dong L M, Li M Y, et al. Effects of solid concentration and organic matter in supernatant on the pH buffering capacity of citric acid sludge[J]. Environmental Chemistry, 2018,37(3):584-590.
[34]
Wang Z, Zheng G, Zhou L. Degradation of slime extracellular polymeric substances and inhibited sludge flocs destruction contribute to sludge[J]. Bioresource Technology, 2015,192:514-521.
[35]
Basuvaraj M, Fein J, Liss S N. Protein and polysaccharide content of tightly and loosely bound extracellular polymeric substances and the development of a granular activated sludge floc[J]. Water Research, 2015,82:104-117.
[36]
He P J, Zhao L, Zheng W, et al. Energy Balance of a Biodrying Process for Organic Wastes of High Moisture Content:A Review[J]. Drying Technology, 2013,31(2):132-145.
[37]
Yang B Q, Zhang L, Yongwoo L, et al. Novel bioevaporation process for the zero-discharge treatment of highly concentrated organic wastewater[J]. Water Research, 2013,47(15):5678-5689.
