{"title":"Struvite crystallization eliminates ammonia inhibition in thermal hydrolysis of waste activated sludge: Role of Mg/P ratio","authors":"Lina Zhao, Zhimin You, Guozhong Wang, Hongbo Chen","doi":"10.1016/j.jwpe.2024.106349","DOIUrl":null,"url":null,"abstract":"<div><div>Thermal hydrolysis (TH) is a promising sludge pretreatment technology, but the ammonia it produces can be hazardous to subsequent anaerobic digestion (AD). This study assessed the potential of using struvite crystallization to mitigate ammonia inhibition in the AD process and examined the impact of the Mg/P ratio. The Mg/P ratio of 1.0 effectively reduced the ammonia concentration to 409 ± 22 mg/L, although methane production decreased by 14 %. Reducing the Mg/P ratio to 0.6 resulted in an 11 % increase in methane production. The study revealed that an excess of Mg<sup>2+</sup> hindered sludge solubilization and inhibited the AD process by reducing enzyme activities, which led to a microbial community detrimental to methane production. This study provides a new idea to alleviate the ammonia inhibition of sludge AD, which is of great scientific value and practical significance for applying of struvite crystallization to TH.</div></div>","PeriodicalId":17528,"journal":{"name":"Journal of water process engineering","volume":"68 ","pages":"Article 106349"},"PeriodicalIF":6.3000,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of water process engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214714424015812","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Thermal hydrolysis (TH) is a promising sludge pretreatment technology, but the ammonia it produces can be hazardous to subsequent anaerobic digestion (AD). This study assessed the potential of using struvite crystallization to mitigate ammonia inhibition in the AD process and examined the impact of the Mg/P ratio. The Mg/P ratio of 1.0 effectively reduced the ammonia concentration to 409 ± 22 mg/L, although methane production decreased by 14 %. Reducing the Mg/P ratio to 0.6 resulted in an 11 % increase in methane production. The study revealed that an excess of Mg2+ hindered sludge solubilization and inhibited the AD process by reducing enzyme activities, which led to a microbial community detrimental to methane production. This study provides a new idea to alleviate the ammonia inhibition of sludge AD, which is of great scientific value and practical significance for applying of struvite crystallization to TH.
期刊介绍：
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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