Efficacy of a high-pressure jet device for excess sludge reduction in a conventional activated sludge process: Pilot-scale demonstration
Efficacy of a high-pressure jet device for excess sludge reduction in a conventional activated sludge process: Pilot-scale demonstration
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DOI：
10.1016/j.cej.2017.05.084
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发表时间：
2017-10
影响因子：
15.1
通讯作者：
H. Yoshino;T. Suenaga;T. Fujii;T. Hori;A. Terada;M. Hosomi
中科院分区：
文献类型：
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作者：
H. Yoshino;T. Suenaga;T. Fujii;T. Hori;A. Terada;M. Hosomi
高压射流装置（HPJD）在污水处理厂曝气池剩余活性污泥减量中的应用前景广阔。然而，证明安装在传统活性污泥（CAS）工艺的回流管线中的HPJD的可行性仍然是一个挑战。我们调查了两个中试规模的CAS工艺与或没有HPJD的差异，以证明其对废物剩余污泥减少和废水处理的影响，在运行108天。与标准CAS相比，HPJD（指定为CAS-HPJD）的应用减少了65%的废活性污泥。尽管从CAS-HPJD出水悬浮固体浓度略有增加，从CAS-HPJD的剩余污泥总量是23%，低于CAS。这两种CAS工艺在去除有机碳、铵和磷酸盐方面表现出相当的性能，表明HPJD对污泥的增溶作用不会破坏活性污泥中的微生物活性。此外，HPJD允许有氧池的氧化，因为强烈的混合，随后产生细小的气泡，导致空气流速降低35%。原核生物16 S rRNA基因的高通量Illumina测序和克隆的真核生物18 S rRNA基因的Sanger测序显示，两个系统中的微生物群落组成是不同的，并且与HPJD处理有关。
Application of a high-pressure jet device (HPJD) is promising for the reduction of excess activated sludge from aeration tanks in wastewater treatment plants. Nevertheless, proving the feasibility of an HPJD installed in the return line of a conventional activated sludge (CAS) process remains a challenge. We investigated differences in two pilot-scale CAS processes with or without an HPJD to demonstrate its influence on waste excess sludge reduction and wastewater treatment during operation for 108 days. The application of the HPJD (designated CAS-HPJD) reduced waste activated sludge by 65% compared with the standard CAS. Despite a slight increase in suspended solids concentration from the CAS-HPJD effluent, the total amount of excess sludge from CAS-HPJD was 23% lower than that of CAS. These two CAS processes exhibited comparable performances in the removal of organic carbon, ammonium and phosphate, indicating that sludge solubilization by the HPJD did not undermine microbial activities in activated sludge. In addition, the HPJD allowed oxygenation of the aerobic tank because of intensive mixing and subsequently produced fine bubbles, resulting in a reduction in the air flow rate of 35%. High-throughput Illumina sequencing of prokaryote 16S rRNA genes and Sanger-sequencing of cloned eukaryote 18S rRNA genes revealed that microbial community compositions in the two systems were distinct and were related to the HPJD treatment.