文章基本信息

标题：Combined free nitrous acid and hydrogen peroxide pre-treatment of waste activated sludge enhances methane production via organic molecule breakdown
本地全文：下载
作者：Tingting Zhang ; Qilin Wang ; Liu Ye 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep16631
出版社：Springer Nature
摘要：This study presents a novel pre-treatment strategy using combined free nitrous acid (FNA i.e. HNO₂) and hydrogen peroxide (H₂O₂) to enhance methane production from WAS, with the mechanisms investigated bio-molecularly. WAS from a full-scale plant was treated with FNA alone (1.54 mg N/L), H₂O₂ alone (10–80 mg/g TS), and their combinations followed by biochemical methane potential tests. Combined FNA and H₂O₂ pre-treatment substantially enhanced methane potential of WAS by 59–83%, compared to 13–23% and 56% with H₂O₂ pre-treatment alone and FNA pre-treatment alone respectively. Model-based analysis indicated the increased methane potential was mainly associated with up to 163% increase in rapidly biodegradable fraction with combined pre-treatment. The molecular weight distribution and chemical structure analyses revealed the breakdown of soluble macromolecules with the combined pre-treatment caused by the deamination and oxidation of the typical functional groups in proteins, polysaccharides and phosphodiesters. These changes likely improved the biodegradability of WAS.