{"id":231,"date":"2025-08-04T07:04:45","date_gmt":"2025-08-04T14:04:45","guid":{"rendered":"https:\/\/scienceblog.com\/sciencechina\/?p=231"},"modified":"2025-08-04T07:04:45","modified_gmt":"2025-08-04T14:04:45","slug":"from-sewers-to-evs-wastewater-sludge-powers-battery-revolution","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/sciencechina\/2025\/08\/04\/from-sewers-to-evs-wastewater-sludge-powers-battery-revolution\/","title":{"rendered":"From Sewers to EVs, Wastewater Sludge Powers Battery Revolution"},"content":{"rendered":"<p>A research team in Shenzhen has found a surprising new energy source hiding in our city sewage.<\/p>\n<p>By recovering phosphorus from municipal wastewater, the team has developed a cleaner, cheaper, and more sustainable way to manufacture lithium iron phosphate (LiFePO4) batteries, crucial components in electric vehicles and grid-scale energy storage systems. The new method transforms chemical sludge into high-performance battery cathodes, offering a two-in-one solution to the growing problems of phosphorus scarcity and urban waste management.<\/p>\n<h2>Why Phosphorus Matters in Clean Energy<\/h2>\n<p>Phosphorus is a critical element for agriculture, but it is also essential for powering the green energy transition. Lithium iron phosphate batteries, commonly used in electric vehicles and energy storage systems, depend on phosphorus-based compounds for their cathodes. China alone consumed about 240,000 tons of phosphorus for battery production in 2022, putting strain on global supplies.<\/p>\n<p>With most phosphorus derived from mined rock, a finite and increasingly expensive resource, scientists have been searching for alternative sources. Municipal wastewater, rich in phosphorus from human and industrial waste, may be the answer.<\/p>\n<h2>Sludge to Cathodes: A Cleaner Process<\/h2>\n<p>The new recovery method developed at the Shenzhen Engineering Research Laboratory uses a byproduct of chemical phosphorus removal (CPR) in wastewater treatment plants. Iron-based coagulants remove phosphorus from treated water, forming a sludge that typically goes to waste.<\/p>\n<p>Here&#8217;s how the team turned that waste into wealth:<\/p>\n<ul>\n<li>The CPR sludge is rich in phosphorus (about 10% by weight) and iron.<\/li>\n<li>Researchers sinter the sludge at 600 \u00b0C and wash it with mild acid.<\/li>\n<li>This produces purified iron-phosphate oxides (Fe<sub>2.1<\/sub>P<sub>1.0<\/sub>O<sub>5.6<\/sub>).<\/li>\n<li>The oxides are used to replace up to 35% of commercial FePO<sub>4<\/sub> in LiFePO<sub>4<\/sub> cathodes.<\/li>\n<\/ul>\n<p>The resulting LiFePO<sub>4<\/sub>\/C batteries show strong performance, with specific discharge capacities up to 149.9 mA\u00b7h\u00b7g<sup>\u22121<\/sup> and cycle stabilities above 99% after 100 cycles.<\/p>\n<h2>More Than Just Batteries: A Sustainable Shift<\/h2>\n<p>This recovery method could supply up to 35% of China&#8217;s phosphorus needs for lithium batteries, according to the study. That\u2019s not just good news for EV makers. It\u2019s a major win for cities grappling with waste and for global efforts to reduce carbon emissions.<\/p>\n<p>&#8220;Unlike conventional phosphorus recovery technologies that produce low-value fertilizers, our method transforms 100% of CPR sludge phosphorus into high-value battery materials,&#8221; the authors wrote.<\/p>\n<p>Even the impurities \u2014 calcium, sodium, magnesium \u2014 seem to help. Small amounts of these elements improve the cathode&#8217;s crystal stability and electrochemical performance. The key is not to overdo it. Higher doses of sludge increase resistance and reduce initial battery capacity, but a 25 to 35 percent blend hits the sweet spot for performance and sustainability.<\/p>\n<h2>Turning a Waste Stream Into a Supply Chain<\/h2>\n<p>The researchers modeled the impact of scaling this process across China. If all municipal wastewater were treated using CPR and sludge-to-cathode conversion, it could yield 94,000 tons of phosphorus annually. That\u2019s enough to cover 39% of the nation\u2019s demand for LiFePO<sub>4<\/sub> battery production in a single year.<\/p>\n<p>Environmental benefits extend beyond raw materials. Each ton of phosphorus recovered through this method could reduce mining-related CO<sub>2<\/sub> emissions by up to 17.2 tons. And with phosphorus prices soaring, this approach also makes economic sense. Net income per ton of sludge processed could rise to over $800, compared to a net loss under fertilizer-based recovery systems.<\/p>\n<h2>A Blueprint for Circular Clean Energy<\/h2>\n<p>This study flips the script on how we think about waste. Sewage sludge, once a disposal headache, is reimagined as a strategic input for clean energy. By cutting mining, reducing carbon, and lowering battery costs, the process could help power a more resilient, circular economy.<\/p>\n<p>More than a technical fix, it\u2019s a systems-level rethinking, linking urban infrastructure, renewable energy, and global supply chains in a new loop of sustainability.<\/p>\n<p><em>Published in the journal <strong>Engineering<\/strong>. DOI: <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2095809924003205\" target=\"_blank\" rel=\"noopener\">10.1016\/j.eng.2024.05.018<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A research team in Shenzhen has found a surprising new energy source hiding in our city sewage. By recovering phosphorus from municipal wastewater, the team has developed a cleaner, cheaper, and more sustainable way to manufacture lithium iron phosphate (LiFePO4) batteries, crucial components in electric vehicles and grid-scale energy storage systems. The new method transforms &#8230; <a title=\"From Sewers to EVs, Wastewater Sludge Powers Battery Revolution\" class=\"read-more\" href=\"https:\/\/scienceblog.com\/sciencechina\/2025\/08\/04\/from-sewers-to-evs-wastewater-sludge-powers-battery-revolution\/\" aria-label=\"Read more about From Sewers to EVs, Wastewater Sludge Powers Battery Revolution\">Read more<\/a><\/p>\n","protected":false},"author":1299,"featured_media":232,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[4,2],"tags":[],"class_list":["post-231","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","category-technology","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>From Sewers to EVs, Wastewater Sludge Powers Battery Revolution - SciChi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/sciencechina\/2025\/08\/04\/from-sewers-to-evs-wastewater-sludge-powers-battery-revolution\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"From Sewers to EVs, Wastewater Sludge Powers Battery Revolution\" \/>\n<meta property=\"og:description\" content=\"A research team in Shenzhen has found a surprising new energy source hiding in our city sewage. 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Aspergillus niger, the same organism that helps ferment soy sauce and produces citric acid for fizzy drinks, is quietly dissolving phosphorus from one of the world's most problematic industrial\u2026","rel":"","context":"In &quot;Environment&quot;","block_context":{"text":"Environment","link":"https:\/\/scienceblog.com\/sciencechina\/category\/environment\/"},"img":{"alt_text":"phosphorous infographic","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/phosphorour-infographic.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/phosphorour-infographic.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/phosphorour-infographic.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/phosphorour-infographic.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":342,"url":"https:\/\/scienceblog.com\/sciencechina\/2026\/01\/18\/the-cigarette-butt-supercapacitor\/","url_meta":{"origin":231,"position":1},"title":"The Cigarette Butt Supercapacitor","author":"SciChi","date":"January 18, 2026","format":false,"excerpt":"Eight million tonnes of cigarette butts are tossed onto streets and into bins worldwide each year. Most decompose glacially slowly, leaching toxins as they go. But what if this ubiquitous waste could power your phone? Researchers in China have transformed discarded cigarette filters into carbon supercapacitors with performance that rivals\u2026","rel":"","context":"In &quot;Environment&quot;","block_context":{"text":"Environment","link":"https:\/\/scienceblog.com\/sciencechina\/category\/environment\/"},"img":{"alt_text":"cigarette butts in sand","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/pexels-mahide-hassan-2152149370-32346588-e1768749732311.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/pexels-mahide-hassan-2152149370-32346588-e1768749732311.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/pexels-mahide-hassan-2152149370-32346588-e1768749732311.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/01\/pexels-mahide-hassan-2152149370-32346588-e1768749732311.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":426,"url":"https:\/\/scienceblog.com\/sciencechina\/2026\/04\/09\/the-single-device-that-can-both-generate-and-store-clean-energy\/","url_meta":{"origin":231,"position":2},"title":"The Single Device That Can Both Generate and Store Clean Energy","author":"SciChi","date":"April 9, 2026","format":false,"excerpt":"Key Takeaways Solid oxide cells can generate electricity or produce hydrogen, offering versatility for clean energy transitions. A new review links solid oxide fuel cells and electrolysis cells, emphasizing a unified approach in research and application. Key challenges include high operating temperatures and material degradation, which hinder commercialization and reliability.\u2026","rel":"","context":"In &quot;Environment&quot;","block_context":{"text":"Environment","link":"https:\/\/scienceblog.com\/sciencechina\/category\/environment\/"},"img":{"alt_text":"Whole-chain framework of solid oxide fuel and electrolysis cells.","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/04\/solid-oxide-fuel.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/04\/solid-oxide-fuel.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/04\/solid-oxide-fuel.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2026\/04\/solid-oxide-fuel.jpeg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":289,"url":"https:\/\/scienceblog.com\/sciencechina\/2025\/11\/15\/electric-vehicle-chargers-can-either-strain-or-stabilize-the-grid\/","url_meta":{"origin":231,"position":3},"title":"Electric Vehicle Chargers Can Either Strain Or Stabilize The Grid","author":"SciChi","date":"November 15, 2025","format":false,"excerpt":"Behind every quick EV top up, the power grid is working harder than most drivers ever realize. In a new experimental modeling study published August 25 2025 in the journal Green Energy and Intelligent Transportation (Beijing Institute of Technology Press), Nitin Kumar Saxena of Teerthanker Mahaveer University in India and\u2026","rel":"","context":"In &quot;Environment&quot;","block_context":{"text":"Environment","link":"https:\/\/scienceblog.com\/sciencechina\/category\/environment\/"},"img":{"alt_text":"Tesla charging station","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/pexels-solyartphotos-12860663.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/pexels-solyartphotos-12860663.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/pexels-solyartphotos-12860663.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/pexels-solyartphotos-12860663.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":303,"url":"https:\/\/scienceblog.com\/sciencechina\/2025\/11\/23\/when-water-becomes-a-battery-flexible-skin-patch-pulls-power-from-thin-air\/","url_meta":{"origin":231,"position":4},"title":"When Water Becomes A Battery: Flexible Skin Patch Pulls Power From Thin Air","author":"SciChi","date":"November 23, 2025","format":false,"excerpt":"Imagine a bandage-like strip on your skin quietly turning humidity, breath and body heat into electricity for your devices. In a new study in the journal Wearable Electronics, a team led by researchers at Nanjing University reports a flexible evaporation-induced generator that uses a carefully engineered \u201cwater-ion-temperature\u201d gradient to reach\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/scienceblog.com\/sciencechina\/category\/technology\/"},"img":{"alt_text":"A flexible EIG generates electricity through coupled mass, charge, and heat transfer, making it well suited for wearable devices.","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/generator.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/generator.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/generator.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/11\/generator.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":16,"url":"https:\/\/scienceblog.com\/sciencechina\/2025\/04\/21\/smart-clothes-power-themselves-through-movement\/","url_meta":{"origin":231,"position":5},"title":"Smart Clothes Power Themselves Through Movement","author":"SciChi","date":"April 21, 2025","format":false,"excerpt":"Your t-shirt might soon track your workout, monitor your health, and control your phone - all without batteries or bulky gadgets. Scientists have created special threads that transform regular clothes into tech hubs using just your body's movement for power. This new technology, recently published in Wearable Electronics, weaves electronic\u2026","rel":"","context":"In &quot;Technology&quot;","block_context":{"text":"Technology","link":"https:\/\/scienceblog.com\/sciencechina\/category\/technology\/"},"img":{"alt_text":"Infographic of the technology","src":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/04\/wirelsss-fabric.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/04\/wirelsss-fabric.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/04\/wirelsss-fabric.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/scienceblog.com\/sciencechina\/wp-content\/uploads\/sites\/16\/2025\/04\/wirelsss-fabric.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/posts\/231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/users\/1299"}],"replies":[{"embeddable":true,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/comments?post=231"}],"version-history":[{"count":1,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/posts\/231\/revisions"}],"predecessor-version":[{"id":233,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/posts\/231\/revisions\/233"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/media\/232"}],"wp:attachment":[{"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/media?parent=231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/categories?post=231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scienceblog.com\/sciencechina\/wp-json\/wp\/v2\/tags?post=231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}