{"689850":{"#nid":"689850","#data":{"type":"news","title":"Doing the Dirty Work of Sustainability ","body":[{"value":"\u003Cdiv\u003E\u003Cp\u003EIt\u2019s not glamorous. It\u2019s not trendy. In fact, it\u2019s downright grubby. But the work that a Georgia Tech researcher and his students are doing is improving campus sustainability, one pound of food waste at a time.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u003Ca href=\u0022https:\/\/people.research.gatech.edu\/node\/2820\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003EDavid Hu\u003C\/a\u003E, a professor in the \u003Ca href=\u0022https:\/\/www.me.gatech.edu\/\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003EGeorge W. Woodruff School of Mechanical Engineering\u003C\/a\u003E and the \u003Ca href=\u0022https:\/\/biosciences.gatech.edu\/\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003ESchool of Biological Sciences\u003C\/a\u003E, gave his senior-level biology class this semester a unique assignment: Feed food waste to black soldier fly larvae, collect the organic byproduct (called \u201cfrass\u201d), and analyze the results. What they\u2019ve found so far is a composting method with the potential to dramatically reduce harmful greenhouse gas emissions while producing a nutrient-dense fertilizer.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cThere\u2019s something special about these grubs,\u201d said Hu, who is also a faculty member within the \u003Ca href=\u0022https:\/\/bioresearch.gatech.edu\/\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003EParker H. Petit Institute for Bioengineering and Bioscience\u003C\/a\u003E. \u201cThey smell, and they\u2019re kind of ugly, but they process food extremely efficiently. When we feed them, they eat twice their body weight, finish that in five hours, and you can do it again the next day. Traditional composting could never be that fast.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EUsing a unique closed-loop system pioneered by private-industry partner and early-stage startup \u003Ca href=\u0022https:\/\/biotechnicausa.com\/\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003EBiotechnica\u003C\/a\u003E, the larvae eat their way through more than 300 pounds of food in one semester, creating valuable frass that students harvest. When the larvae mature into adults, they fly into a shared chamber to reproduce, make more grubs, and start the process over again.\u0026nbsp;\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cYou can get a turnaround from food waste to frass in a day or two, and then from the raw frass to our ground-up frass that we use for our plants,\u201d said Mikkelle Peters, a fourth-year biology major in Hu\u2019s class. \u201cIt\u2019s just a much quicker process to get rid of the food waste.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EFeeding and studying an army of larvae that can eat more than 10 gallons of food a day keeps Hu\u2019s students busy. The solution? Divide and conquer.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EThe first group in the process gathers and grinds food scraps to feed the grubs, then collects the frass they produce. The next group mixes the frass with soil and analyzes its chemical makeup, comparing its nutrient density to commercial fertilizers. A third group uses the fertilized soil to grow vegetables like arugula and radishes that are measured against plants grown using synthetic fertilizer. The final two groups observe the environmental conditions that affect productivity and analyze the grubs\u2019 digestion to uncover the secrets to their success.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EMore testing will need to be done on outdoor farms to provide rigorous results. Data over the past few semesters were, at times, inconsistent. But the students\u2019 projects reveal a lot of promise for future experiments. Despite limitations to the study, including a small sample size and minor instrument malfunction, the students have been able to find helpful nutrients in their product and grow certain crops more successfully with frass than with commercial fertilizer. Unlike chemically based products or some traditional composts that need to be specially treated, black soldier fly frass is organic and easily processed.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cA lot of fertilizers can cause harmful runoff, and they can change soil balances over time,\u201d Peters said. \u201cFrass is a natural product, has more fibrous material, and has a lot more organic compounds.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EIn addition to the science that the students are exposed to, Hu said it is also eye-opening for them to see the work of sustainability. The project is an excellent case study for how a small group can make a big impact.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cThe students have learned a lot,\u201d Hu said. \u201cFor one of the activities, we had them bring in their own food waste from home to feed the composter. They realized that a person makes pounds of waste per day.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EAccording to the \u003Ca href=\u0022https:\/\/sustain.gatech.edu\/\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003EOffice of Sustainability\u003C\/a\u003E, the campus produces about 400 tons of food waste per year. Although Georgia Tech boasts \u003Ca href=\u0022https:\/\/www.gatech.edu\/news\/2025\/11\/07\/new-composter-enhance-campus-waste-reduction\u0022 rel=\u0022noreferrer noopener\u0022 target=\u0022_blank\u0022\u003Eone of the largest commercial composters\u003C\/a\u003E on an urban campus in the Southeast, the machine can only process 175 tons per year. That leaves a gap that Hu said his research might one day be able to fill.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cRight now, it\u2019s working,\u201d he said. \u201cWe want to expand and see if it can work some more. The big issue is visibility, getting people to know that what we\u2019re doing is good. Because in some ways, saving the planet takes energy.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EOne of the main energy sources for the experimental composter is something Hu hopes to reduce: manpower. With a campus the size of Georgia Tech\u2019s, it\u2019s a very labor-intensive process for students to collect food waste from campus partners. Hu hopes that more community members will volunteer, not only to collect food, but also to improve the system.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cWe need people power \u2014 people willing to volunteer to move, because right now, campus produces a lot of waste in different places,\u201d he said. \u201cAnd we also need biologists and engineers and computer scientists. We need people to make this system more well-engineered.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003EAlthough the current black soldier fly composter still has some flaws, Hu said his goal is to create an affordable, climate-friendly food waste recycling system that can scale up to support U.S. agriculture. By solving problems at the local level, his research is potentially removing economic and operational barriers to sustainability. But, according to Hu, the final step to long-term success is community involvement.\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003Cp\u003E\u201cIn the end, we need people who care,\u201d Hu said. \u201cIt doesn\u2019t take that much effort to do a little bit, and a little bit can go a long way.\u201d\u0026nbsp;\u003C\/p\u003E\u003C\/div\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EA Georgia Tech researcher and his students are using experimental composting to reduce campus food waste and support agriculture. Using a unique closed-loop system, black soldier fly larvae eat their way through more than 300 pounds of food in one semester, creating valuable frass that students harvest. What they\u2019ve found so far is a composting method with the potential to dramatically reduce harmful greenhouse gas emissions while producing a nutrient-dense fertilizer. \u0026nbsp;\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"A Georgia Tech researcher and his students are using experimental composting to reduce campus food waste and support agriculture. "}],"uid":"36479","created_gmt":"2026-04-17 19:22:36","changed_gmt":"2026-04-17 19:33:25","author":"abowman41","boilerplate_text":"","field_publication":"","field_article_url":"","location":"Atlanta, GA","dateline":{"date":"2026-04-17T00:00:00-04:00","iso_date":"2026-04-17T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"679996":{"id":"679996","type":"image","title":"BSF-Compost-Hu.jpg","body":null,"created":"1776454082","gmt_created":"2026-04-17 19:28:02","changed":"1776454082","gmt_changed":"2026-04-17 19:28:02","alt":"Researcher standing in a greenhouse-like structure adjusts a blue barrel\u2013based composting system equipped with insulated tubing, used for black soldier fly larvae composting.","file":{"fid":"264227","name":"BSF-Compost-Hu.jpg","image_path":"\/sites\/default\/files\/2026\/04\/17\/BSF-Compost-Hu.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2026\/04\/17\/BSF-Compost-Hu.jpg","mime":"image\/jpeg","size":5241811,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2026\/04\/17\/BSF-Compost-Hu.jpg?itok=dATV7NeP"}}},"media_ids":["679996"],"groups":[{"id":"1292","name":"Parker H. Petit Institute for Bioengineering and Bioscience (IBB)"},{"id":"1188","name":"Research Horizons"}],"categories":[{"id":"138","name":"Biotechnology, Health, Bioengineering, Genetics"}],"keywords":[{"id":"187915","name":"go-researchnews"},{"id":"187423","name":"go-bio"},{"id":"188776","name":"go-research"},{"id":"166882","name":"School of Biological Sciences"},{"id":"14545","name":"George W. Woodruff School of Mechanical Engineering"},{"id":"168693","name":"campus sustainability"}],"core_research_areas":[{"id":"39441","name":"Bioengineering and Bioscience"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EAshlie Bowman | Communications Manager\u003C\/p\u003E\u003Cp\u003EParker H. Petit Institute for Bioengineering and Bioscience\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}