蒸汽爆破对城市污泥预处理和厌氧发酵产酸的影响

发布时间：2018-01-02 19:17

本文关键词：蒸汽爆破对城市污泥预处理和厌氧发酵产酸的影响　出处：《中国环境科学》2017年01期 　论文类型：期刊论文

【摘要】：利用蒸汽爆破技术对城市污泥进行预处理,研究了不同压力和保压时间结合条件下蒸汽爆破对污泥理化性质和后续厌氧发酵产酸的影响.结果表明,经蒸汽爆破预处理后,部分污泥絮体结构被破坏,污泥液相中SCOD、蛋白质、多糖和DNA浓度分别达到最高的9544mg/L、596.7mg/L,1515mg/L,9.1ng/μL(2MPa,4min),相比于对照组污泥分别提高37.7、19.4、12.5和3.64倍,同时能提高污泥可生化性;蒸汽爆破能有效减小污泥颗粒体积,相比对照组污泥平均体积粒径最高降低52.59%;蒸汽爆破后污泥经过厌氧发酵,产酸量分别达到最高的7.34g/L(1MPa,3min)、7.12g/L(1.5MPa,1min)、8.15g/L(2MPa,4min),相比于对照组污泥分别提高了1.55、1.51和1.72倍,最高产酸率为234.76mg COD/g VSS.进一步提高预处理强度能够改善污泥溶解性和发酵产酸性能.
[Abstract]:The effect of steam blasting on the physical and chemical properties of sludge and the subsequent anaerobic fermentation acid production under different pressure and pressure holding time was studied by using steam blasting technology to pre-treat the municipal sludge. After pretreatment by steam blasting, some of the sludge floc structure was destroyed, and the concentration of SCO, protein, polysaccharide and DNA in the liquid phase of sludge reached the highest level of 9544 mg / L, 596.7 mg / L, respectively. 1515mg / L 9.1ng / 渭 L ~ (-2) MPA ~ (2) min ~ (-1) increased 37.7g / L ~ 19.412.5 and 3.64 times compared with the control group, respectively. At the same time, it can improve the biodegradability of sludge. Steam blasting can effectively reduce the granular volume of sludge, compared with the control group, the average volume particle size of sludge decreased 52.59%. After anaerobic fermentation after steam blasting, the acid production of sludge reached the highest 7.34 g / L ~ (-1) MPa ~ (3) min ~ (-1) ~ (-1) ~ (-1) g / L ~ (1.5) MPA ~ (-1) 路min ~ (-1) 路min ~ (-1) 路min ~ (-1). Compared with the control group, 8.15g / L ~ (-2) MPA ~ (2) min ~ (-1) increased the sludge by 1.55 ~ 1.51 and 1.72 times, respectively. The highest acid yield was 234.76 mg COD/g VSs. Further increasing the pretreatment intensity could improve the solubility of sludge and the acid-producing ability of fermentation.
【作者单位】：江南大学环境与土木工程学院江苏省厌氧生物技术重点实验室;镇江东方生物工程设备技术有限责任公司;
【基金】：科技部“十二五”科技支撑项目(2014BAD24B03-02) 中央高校基本科研业务费专项资金资助(JUSRP51633B)
【分类号】：X703
【正文快照】： 城市污泥是城市生活污水处理厂的重要副产物,污泥中含有大量有机质,其中一部分以胞外聚合物(EPS)的形式存在于微生物的细胞表面,另一部分存在于微生物细胞质内[1-3].随着我国城市化进程的加快,城市的污水处理率逐年提高,污泥产生量也随之急剧增加,以含水率80%计,2015年污泥产

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