Tag Archives: Organic waste

Social aspects of recycling household wastes: perspectives from Jordan

We were at the Hashemite University in Jordan last week, teaching a group of young students how we can safely recycle different household waste fractions. As part of this week-long course, we organised a day of interactive seminars and a role playing game to improve awareness among the students about the psychology, decision making, and socio-technical aspects of recycling waste.

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Robert Almqvist joins kretsloppsteknik for his master’s project

Hi, my name is Robert Almqvist and I am writing my master thesis in Biology at the institution of energy and technology. I am a soil/plant-agricultural program student matriculated at SLU Uppsala since 2014. In my master thesis, I will look at fly larvae composting and at the possible effect different pre-treatments has on amino acid content of the larvae as well as the degrading of lignin/cellulose/hemicellulose in the substrates, the substrates being banana- and orange peels in this experiment.

Teaching students in Jordan about safe nutrient recycling

This week, we (Sahar Dalahmeh, Mikael Pell, Annika Nordin, Cecilia Lalander, and Prithvi Simha) are in Jordan, conducting a 1-week course on recycling of various household waste fractions. The course is given at the Hashemite University, located about 50 km away from the capital city Amman. A group of about 20 very enthusiastic and inquistive students are learning about various topics such as wastewater microbiology, hygienisation, urine diversion and dehydration, vermi- and black soldier fly composting, on-site wastweater treatment, etc.

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Cecilia Lalander from our group is about to give her Docent Lecture!

Date: 30/9 – 2019 | Time: 10:30 | Location: Room L, Main University building (Ulls hus), Ultuna campus

Is biodegradable waste a problem or a resource? Some claim it’s a resource that can be managed in a much more efficient way, but how come it isn’t? How could a more efficient management look like? If you find these questions interesting, come and listen to Cecilia’s lecture. A summary of the lecture, that will be given in English, can be found below.  

More info on all Docent lectures given at Ultuna this time can be found here: https://www.slu.se/en/ew-calendar/2019/9/docent-lectures-at-the-nj-faculty/

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Moisture content affects greenhouse gas emissions from thermophilic food waste composting

The effects of moisture on thermophilic composting process are investigated in the latest paper published in the Journal of Cleaner Production: https://doi.org/10.1016/j.jclepro.2019.118165

It is known that too wet active composts can cause excessive methane (CH4) emissions, but there is no consensus on how much and what exactly the rate of this change is with changing moisture.

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Modeling large-scale Eskilstuna pilot fly larvae composting system

Black soldier fly larvae growth in the food waste. Photo Erik Dahlquist

A study “Model selection for waste conversion efficiency and energy demands in a pilot for large-scale larvae treatment” was presented at the 60th International Conference of Scandinavian Simulation Society, SIMS 2019, in Västerås, Sweden.

The study evaluated some technical aspects associated with larvae growth, ventilation and drying demands in a pilot sized black soldier fly treatment system treating segregated household food waste and discussed models to describe the treatment process and its energy efficiency.

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Greenhouse gas emissions from small-scale fly larvae composting

Frida Erlöv taking a gas sample. Photo: Evgheni Ermolaev

A new paper evaluating the greenhouse gas (GHG) emissions from small-scale fly larvae composting is published. The full paper is available here: https://doi.org/10.1016/j.wasman.2019.07.011

The aim of the study was to evaluate GHG and ammonia (NH3) emissions from fly larvae composting treatment of food waste and the effects of pre-treatment and seeding of the food waste substrate with BSF larvae-associated bacteria on the efficiency and rate of the fly larvae composting process.

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Insecta Conference, Potsdam 5-6 September

On the 5th and 6th of September Giulio attended to the Isecta conference in Potzdam (Germany). The conference gave valuable insights and the latest finding on the topic of insects for food and feed covering several aspects of the sector, from the legislation point of view to basic research and optimisation of rearing systems. At the event attended more than 230 people between scientist and businesses from 38 countries underling the growth of the sector and public interest on the topic.

Fly larvae composting research presented at Matologi

Vesa Hiltula, Benny Björk, Evgheni Ermolaev and Nils Ewald. Photo: Ingrid Strid.

Evgheni Ermolaev and Nils Ewald from SLU Kretsloppsteknik together with Vesa Hiltula and Benny Björk from Eskilstuna Strängnäs Energi och Miljö AB presented the latest research results and the large-scale implementation progress of the fly lave composting system developed in the group from 2011. Matology is a yearly exhibition held by SLU in Stockholm with focus highlighting the latest trends in sustainable food systems.

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