Spent coffee ground as a new bulking agent for accelerated biodrying of dewatered sludge

被引:52
作者
Hao, Zongdi [1 ]
Yang, Benqin [2 ]
Jahng, Deokjin [1 ]
机构
[1] Myongji Univ, Dept Environm Engn & Energy, 116 Myongjiro, Yonginshi 17058, Gyeonggido, South Korea
[2] Kunming Univ Sci & Technol, Fac Environm Sci & Engn, Kunming 650500, Yunnan, Peoples R China
基金
新加坡国家研究基金会;
关键词
Biodrying; Spent coffee ground (SCG); Dewatered sludge (DS); Dissolved organic matter (DOM); Bacterial community; VOLATILE SOLIDS DEGRADATION; INITIAL MOISTURE-CONTENT; WASTE-WATER SLUDGE; SEWAGE-SLUDGE; MICROBIAL COMMUNITY; COMPOSTING PROCESS; POULTRY MANURE; PARTICLE-SIZE; BY-PRODUCTS; FOOD WASTE;
D O I
10.1016/j.watres.2018.03.049
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The feasibility of using spent coffee ground (SCG) as a new bulking agent for biodrying of dewatered sludge (DS) was investigated in comparison with two other frequently-used bulking agents, air-dried sludge (AS) and sawdust (SD). Results showed that the moisture contents (MC) of 16-day DS biodrying with AS (Trial A), SCG (Trial B) and SD (Trial C) decreased from 70.14 wt%, 68.25 wt% and 71.63 wt% to 59.12 wt%, 41.35 wt% and 57.69 wt%, respectively. In case of Trial B, the MC rapidly decreased to 46.16 wt% with the highest water removal (70.87%) within 8 days because of the longest high-temperature period (5.8 days). Further studies indicated that the abundant biodegradable volatile solids (BVS) and high dissolved organic matter (DOM) contents in SCG were the main driving forces for water removal. According to pyrosequencing data, Firmicutes, most of which were recognized as thermophiles, was rapidly enriched on Day 8 and became the dominant phylum in Trial B. Four thermophilic genera, Bacillus, Ureibacillus, Geobacillus and Thermobifida, which can produce thermostable hydrolytic extracellular enzymes, were the most abundant in Trial B, indicating that these thermophilic bacteria evolved during the long high-temperature period enhanced the biodegradation of BVS in SCG. The 8-day biodried product of Trial B was demonstrated to be an excellent solid fuel with low heating value (LHV) of 9284 kj kg(-1), which was 2.1 and 1.8 times those of biodried products with AS and SD, respectively. Thus SCG was found to be an excellent bulking agent accelerating DS biodrying and producing a solid fuel with a high calorific value. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:250 / 263
页数:14
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