Toward carbon neutrality and circular economy: an innovative combination of enhanced biogas production and nutrient recovery from sludge dewatering liquor at a municipal wastewater treatment plant in Germany

Water Science & Technology Pub Date : 2024-07-20 DOI:10.2166/wst.2024.247

A. Kleyböcker, Fabian Kraus, Stefanie Meyer, Janina Heinze, Franziska Gromadecki, Christian Remy

{"title":"Toward carbon neutrality and circular economy: an innovative combination of enhanced biogas production and nutrient recovery from sludge dewatering liquor at a municipal wastewater treatment plant in Germany","authors":"A. Kleyböcker, Fabian Kraus, Stefanie Meyer, Janina Heinze, Franziska Gromadecki, Christian Remy","doi":"10.2166/wst.2024.247","DOIUrl":null,"url":null,"abstract":"\n \n An innovative circular economy (CE) system was implemented at the wastewater treatment plant (WWTP) in Brunswick. The performance of the CE system was evaluated for 4 years: the thermal pressure hydrolysis enhanced the methane production by 18% and increased the digestate dewaterability by 14%. Refractory COD formed in thermal hydrolysis and increased the COD concentration in the WWTP effluent by 4 mg L−1 while still complying with the legal threshold. Struvite production reached high phosphorus recovery rates of >80% with a Mg:P molar ratio ≥0.8. Nitrogen was successfully recovered as ammonium sulfate with high recovery rates of 85–97%. The chemical analyses of secondary fertilizers showed a low pollutant content, posing low risks to soil and groundwater ecosystems. The total carbon footprint of the WWTP decreased due to enhanced biogas production, the recovery of renewable fertilizers and a further reduction of nitrous oxide emissions. Using green energy will be crucial to reach carbon neutrality for the entire WWTP.","PeriodicalId":505935,"journal":{"name":"Water Science & Technology","volume":"113 33","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Water Science & Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2166/wst.2024.247","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

An innovative circular economy (CE) system was implemented at the wastewater treatment plant (WWTP) in Brunswick. The performance of the CE system was evaluated for 4 years: the thermal pressure hydrolysis enhanced the methane production by 18% and increased the digestate dewaterability by 14%. Refractory COD formed in thermal hydrolysis and increased the COD concentration in the WWTP effluent by 4 mg L−1 while still complying with the legal threshold. Struvite production reached high phosphorus recovery rates of >80% with a Mg:P molar ratio ≥0.8. Nitrogen was successfully recovered as ammonium sulfate with high recovery rates of 85–97%. The chemical analyses of secondary fertilizers showed a low pollutant content, posing low risks to soil and groundwater ecosystems. The total carbon footprint of the WWTP decreased due to enhanced biogas production, the recovery of renewable fertilizers and a further reduction of nitrous oxide emissions. Using green energy will be crucial to reach carbon neutrality for the entire WWTP.

查看原文本刊更多论文

实现碳中和与循环经济：德国一家城市污水处理厂创新性地将沼气生产和污泥脱水液营养回收结合起来

不伦瑞克的污水处理厂（WWTP）采用了创新的循环经济（CE）系统。对循环经济系统的性能进行了为期 4 年的评估：热压水解使甲烷产量提高了 18%，沼渣脱水率提高了 14%。热水解过程中产生了难降解的 COD，使污水处理厂出水中的 COD 浓度增加了 4 毫克/升，但仍符合法定标准。在 Mg:P 摩尔比≥0.8 的情况下，硬石膏生产的磷回收率高达 80%以上。氮以硫酸铵的形式成功回收，回收率高达 85-97%。二次肥料的化学分析显示污染物含量较低，对土壤和地下水生态系统的风险较低。由于提高了沼气产量、回收了可再生肥料并进一步减少了一氧化二氮的排放，污水处理厂的总碳足迹有所减少。使用绿色能源对于实现整个污水处理厂的碳中和至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Water Science & Technology

自引率

0.00%

发文量