A quick update to say that we officially have power at our new location!
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Sustainable Composting Research at Princeton
A quick update to say that we officially have power at our new location!
Dear friends of the S.C.R.A.P. Lab,
We hope all forty-two of you are continuing to stay healthy and are enjoying a great start to 2022 ! As with every first post of a new year and new semester, the ComPOSTer takes a moment to recap the past year and more importantly, provide some optimism about what is to come in the year ahead.
Unfortunately our original plan to relocate and re-open the S.C.R.A.P. Lab during the spring of 2021 was halted due to permitting challenges. While the relocation was delayed to early September, progress was swift, and the entire facility and composting system were reassembled in November. In the meantime, the ComPOSTer completed its faculty Q&A blog series with the graduation of Wesley Wiggins ’21 and covered other news about legislative updates on the state of organics recycling in New Jersey, and world news such as The Global Methane Pledge.
Additionally, we have made good use of the pause in operations by getting more involved in community partnerships in food and agriculture research, understanding how environmental justice factors into these issues, deepening our operations training, networking with other system operators and industry experts, and developing a re-start plan that includes practical tweaks to the facility and equipment that will help make operations easier.
The last remaining step before we can restart operations is the electrical hookup. We are hopeful students will once again have a hand in operations this semester. Then we are planning to pick-up where we started on our operational and research efforts, including:
New updates include the installation of an exhaust fan (back of the facility) and the pouring of the concrete pad for the adjacent wood shed
Meanwhile… Testifying before Congress, Professor Peter Jaffé called on the federal government to support research into and mitigation of chemicals called PFAS, or “forever chemicals” because of the time they take to break down in the environment. Earlier this year, the ComPOSTer interviewed Dr. Jaffé about his research to mitigate PFAS contamination and to remove the chemical from groundwater and the environment. Dr. Jaffé recommended that Congress direct more funding into research on the forever chemicals, arguing that a better understanding of their impacts will help with mitigation.
Read more about Dr. Jaffe’s testimony and find the full briefing here: https://engineering.princeton.edu/news/2021/12/09/jaffe-briefs-congress-forever-chemicals
In a recent BioCycle column, Dr. Sally Brown shows how the biggest risk of exposure to PFAS comes from direct exposure pathways to dust, cosmetics, cookware and packaging (including the food that touches both). As a result, PFAS ends up inn compost but concentrations are much lower than those in many household products. Dr. Brown argues that the manufacturing of products with PFAS should be restricted to prevent the direct exposure to these chemicals, instead of restrictions being placed on down-stream sources of PFAS like compost. The compostable food packaging industry is currently testing and developing viable alternatives that don’t include PFAS so these chemicals don’t end up in composts in the first place. However they are currently not widely available or in limited supply.
This month we’ve made significant progress on the reconstruction of the composting facility. Check out the photo essay below to see and hear about several new and exciting design and infrastructure improvements (and some well-aged compost)!
More updates to come in December. We are getting closer to a “power on” date and hope to resume composting operations in January of the New Year.
Have a happy and healthy Thanksgiving holiday!
In this ComPOSTer, we provide an update on our facility relocation and highlight an interesting upcoming webinar on Wasted Food Solutions and more composting-related current events.
SCRAPPY on the move
Efforts are underway to move the composting system into the reconstructed facility. Pictured above is a forklift transporting “SCRAPPY” from its storage location to the facility where it will be placed on the elevated slab below
Wasted Food Solutions Webinar
Join this virtual workshop co-hosted by the Center for EcoTechnology (CET) and New Jersey Composting Council (NJCC) to learn about strategies for implementing wasted food prevention, donation, and diversion programs in businesses in the food service sector. Although specific to New Jersey and its Food Waste Law, participants will leave with an understanding of the next steps for building wasted food management into their operations and gain access to digital resources and guidance documents. All attendees will also have access to free one-on-one support from CET, which will take place in the last hour of the workshop.
The Global Methane Pledge was introduced recently as an ambitious plan to slash global methane emissions 30 percent by 2030.
The pledge is a big step for limiting the potent greenhouse gas, but critics are quick to point out that the pledge fails to address limiting emissions from the largest source of methane globally — agriculture.
As an alternative solution, New Jersey Senator Cory Booker reintroduced the Farm System Reform Act, which imposes a moratorium on these industrial facilities and creates federal financial assistance for farmers to transition to pasture-based dairy and hog farming.
Read more: There’s a major gap in the new methane pledge: Agriculture
NOTE: If managed properly, grass-fed animal operations can be a more sustainable option and healthier to nearby communities, however the scientific community is still in debate over whether pasture-raised systems (in particular beef), are consistently more climate-friendly than industrial beef.
In today’s update we bring the first photos of the S.C.R.A.P. Lab as it is being reconstructed!
Check out the photo essay below from the construction site:
Welcome back to campus for the new academic year!
It is great to see everyone back again while continuing measures to prevent the spread of covid.
This summer we received our municipal permit to begin the reconstruction of our composting facility on Washington Rd near Princeton’s solar field (see circled area on the map below)
This week the concrete was poured to create the slab and by mid-September the fabric structure will be re-erected and then we will reassemble the composting system inside (more updates and pictures to come). The operational restart is still tentative but will happen sometime this semester, likely in mid/late October.
In other composting news:
The ComPOSTer will continue to follow and provide updates on these and other related legislation.
Our faculty Q&A series wraps up with an update from Professor Xinning Zhang, an environmental microbiologist jointly appointed in the Department of Geosciences and the High Meadows Environmental Institute. This month, the ComPOSTer interviewed Dr. Zhang to learn more about how her lab is extending its research in microbial metabolism and biogeochemcical cycling on the Princeton campus, and how it relates to environmental justice.
What are the main questions that your research group is asking about the composting process and how is the S.C.R.A.P. lab involved?
The Zhang lab is broadly interested in understanding the role of microbes in decomposition and greenhouse gas cycling within man-made and natural environments. As the environmental and human health harms of using industrial fertilizers to promote plant growth have become clear, many communities, including the University and the township, are exploring compost as a nutrient rich amendment to soils in place of industrial fertilizers.
Working with the S.C.R.A.P. lab, members of the Zhang group (Gabrielle D’Arcangelo ’21, Galen Cadley ’21, Dr. Jared Wilmoth) have been studying the microbial decomposition of food and garden waste into compost and greenhouse gases like carbon dioxide and methane with the aim of optimizing Princeton University’s aerobic digester for producing nutrient rich compost with low net greenhouse gas emissions. Specifically, we would like to determine (a) who the main microbial actors are in the compositing process, (b) how these microbes work together to make healthy compost, and (c) how microbes and their activities respond to changes in the composition of incoming food waste flows and environmental characteristics like aeration levels and temperature.
What have been the preliminary findings to-date and the next steps in the research?
While there is insufficient sample consistency to make any firm conclusions, preliminary findings of the microbial community analysis have identified Lactobacillus and Acetobacter to be the most dominant bacterial groups (indicating a rapid uptake of simple sugars), followed by Clostridium and Chitonophaga (complex carbon degradation), and less than 1% of methane-producing organisms, the most dominant being the oxygen-intolerant hydrogen gas consumer, Methanobacterium.
An accumulation of the latter category or “methanogens” was found during a power outage and when on-loading/off-loading of material was halted. These results indicate that to avoid increased methane emissions, compost materials should not be allowed to sit for long durations (> a couple days) in the composter, particularly in the back end of the unit where oxygen-free conditions favoring microbial methane production easily develop.
Future work will aim at evaluating whether increases in aeration frequency and/or changes in food waste/bulking agent composition will further reduce composter methane levels. However it is important to note that even optimally working municipal waste composts can contain anaerobic pockets allowing the presence of about 1% methane-producing bacterial species, so these results are consistent with those found in other composting operations.
Why is this research important and how does it relate to environmental justice?
The application of industrial fertilizers leads to numerous environmental problems, most notably the eutrophication of water supplies with detrimental effects on water quality, fisheries health, and greenhouse gas emissions. Unfortunately, these environmental harms are disproportionately borne by people of color in lower income neighborhoods. We hope that our work with the S.C.R.A.P. lab on the science behind composting will aid in weaning our food and landscaping system off industrial fertilizers to promote environmental health and justice.
Interview edited for length and clarity
Dear friends of the S.C.R.A.P. Lab,
Thank you for your loyal following during this unusual year of hardship and sorrow due to a global pandemic and acts of national racial injustice. Usually the last ComPOSTer of the year serves as an ode to the past year, but I think we can all agree that we rather leave 2020 behind. Still, with the New Year only several hours away, the ComPOSTer takes a moment to look back on the (brief) composting highlights of 2020, but more importantly, what is to come in the New Year. We are optimistic about 2021!
January – March : Started off the year strong, just where we left off after our first full calendar year of operations. We converted 14 tons of food scraps into nutrient-rich compost before COVID-19 forced our facility to shutdown early in Mid-March.
April: Debuted a new video highlighting the behind the scenes processes and the people involved in the journey from food scrap to compost
May:
June: Began the study of compost application on campus farmland
August – December:
The S.C.R.A.P Lab was featured in…
Re-construction of our composting facility at our new home will begin early next year with operations expected to resume in Spring 2021. We will continue to engage our students as operational assistants, albeit under new social distancing and other covid-related guidelines. Otherwise we plan to pick-up where we started on our operational and research efforts, including:
Before the Thanksgiving break, I attended the New Jersey Composting Council’s annual Organics Waste Summit on November 19th. Included in the topics of the virtual event were legal updates around the state of organics in New Jersey. Read on for highlights:
Aimed to directly or indirectly advance progress toward the “80×50” goal: