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However, the biotoxicity of CH<\/jats:styled-content>2<\/jats:sub>O inhibited microbial activity and decreased removal performance. We developed a novel heterotopic CH<\/jats:styled-content>2<\/jats:sub>O biodegradation process that combined bioelectrochemical system (BES<\/jats:styled-content>) and UV<\/jats:styled-content>\/H2<\/jats:sub>O2<\/jats:sub>. Instead of exogenous addition, H2<\/jats:sub>O2<\/jats:sub> was biosynthesized with electron transferred from electrochemically active bacteria. Heterotopic biodegradation of CH<\/jats:styled-content>2<\/jats:sub>O was more efficient and faster than in situ biodegradation, as confirmed by 69%\u2013308% higher removal efficiency and 98% shorter degradation time. Operated under optimal conditions for 30\u00a0min, which are optical distance of 2\u00a0cm, initial H2<\/jats:sub>O2<\/jats:sub> concentration of 102\u00a0mg\/L, and pH<\/jats:styled-content> 3, heterotopic biodegradation removed 78%, 73%, 49%, and 30% of CH<\/jats:styled-content>2<\/jats:sub>O with 6, 8, 10, and 20\u00a0mg\/L initial concentration. Mild formation of hydroxyl radicals from UV<\/jats:styled-content>\/H2<\/jats:sub>O2<\/jats:sub> is beneficial to sustainable CH<\/jats:styled-content>2<\/jats:sub>O degradation and efficient H2<\/jats:sub>O2<\/jats:sub> utilization. Heterotopic biodegradation is a promising technology for efficient degradation of other organic compounds with biological toxicity.<\/jats:p><\/jats:sec>Practitioner points<\/jats:title>\n\n\nH2<\/jats:sub>O2<\/jats:sub> biosynthesis through electrochemically active bacteria (EAB)<\/jats:styled-content> served as source of \u00b7OH<\/jats:styled-content> for CH<\/jats:styled-content>2<\/jats:sub>O removal in UV<\/jats:styled-content>\/H2<\/jats:sub>O2<\/jats:sub>.<\/jats:p><\/jats:list-item>\n\nHeterotopic CH<\/jats:styled-content>2<\/jats:sub>O biodegradation avoided the biotoxicity of CH<\/jats:styled-content>2<\/jats:sub>O.<\/jats:p><\/jats:list-item>\n\nHeterotopic biodegradation of CH<\/jats:styled-content>2<\/jats:sub>O saved 98% time than in\u2010situ biodegradation.<\/jats:p><\/jats:list-item>\n\nHeterotopic CH<\/jats:styled-content>2<\/jats:sub>O biodegradation improved 69%\u2013308% efficiency than in\u2010situ.<\/jats:p><\/jats:list-item>\n<\/jats:list>\n<\/jats:p><\/jats:sec>","DOI":"10.1002\/wer.1070","type":"journal-article","created":{"date-parts":[[2019,3,13]],"date-time":"2019-03-13T22:50:15Z","timestamp":1552517415000},"page":"598-605","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Heterotopic formaldehyde biodegradation through UV\/H2<\/sub>O2<\/sub> system with biosynthetic H2<\/sub>O2<\/sub>"],"prefix":"10.1002","volume":"91","author":[{"given":"Qian","family":"Zhao","sequence":"first","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jingkun","family":"An","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shu","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jia","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5852-2325","authenticated-orcid":false,"given":"Nan","family":"Li","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Tianjin University Tianjin China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,3,13]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemosphere.2005.04.027"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.watres.2017.06.087"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jhazmat.2018.11.058"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097-4660(199611)67:3<221::AID-JCTB556>3.0.CO;2-H"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.555805"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpowsour.2013.12.114"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpowsour.2015.04.071"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpowsour.2017.01.093"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/es9032925"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/jctb.2367"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jenvman.2012.04.024"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.3390\/molecules21010056"},{"issue":"40","key":"e_1_2_6_14_1","first-page":"6107","article-title":"The photochemical decomposition of hydrogen peroxide quantum yields, tracer and fractionation effects","volume":"74","author":"Hunt J. 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