Tag Archives: Organic waste

Presentation for 10th grade students about fly larvae composting

Lovisa explains the waste hierarchy. Photo: Pernilla Bjerling

ProCivitas private school for grade 10-12 is a small school with students in the science program and the social science program. The school provide the students with lectures about research once every month, called the lecture of the month, with different themes. This month, the theme was sustainable systems and Lovisa Lindberg from the group went there to talk about fly larvae composting but also Maria Westerholm from a different department at SLU went there to talk about biogas research.

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Live streaming of fly larvae composting project at Hedda Wising School

Fly larvae composting has sparked interest in 8th grade students from Hedda Wising school, who wanted to test fly larvae composting on their own.

The aim of the project is to evaluate how simple the system can be and how fast the process goes. The students are driving this experiment with aim to produce feed protein that can be used for chicken or fish production. The substrate is the canteen leftovers that would otherwise become food waste. The project at the school is a part of an EU collaboration project ”Envising” with focus on sustainability.

Follow the link to check out the larvae:

https://www.youtube.com/channel/UCT00Ppow_EYo_52IDHq59Bg

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Using Hermetia illucens larvae to process biowaste from aquaculture production

A paper was published in the Journal of Cleaner Production as a result of the partnership established between the Environmental Engineering Research Group at SLU and the PhD candidate Ivã Guidini Lopes, a researcher from São Paulo, Brazil. This paper addresses the management of waste generated in aquaculture enterprises (fish carcasses) by larvae of the black soldier fly (BSF, Hermetia illucens).

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SIDA International Training Programme at Kretsloppsteknik

Earlier this week, a few members of Kretsloppsteknik hosted a group of SIDA’s International Training Programme participants in Uppsala. NIRAS on behalf of SIDA implements a number of International Training Programmes. Kretsloppsteknik is involved as part of this program through NIRAS with focus on participants from both Asian and African countries. During these visits, we teach, present, and do technology demonstration through field visits talking about safe nutrient recycling, source-separating sanitation systems, management of organic wastes, socio-technical systems analysis, etc.

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Manejo de desechos mediante insectos fue presentado en honor al profesor Erik Dahlquist

El jueves de la semana pasada (31/10), Björn y Cecilia del grupo de Ingeniería Ambiental (Kretsloppsteknik) visitaron Västerås y realizaron una presentación acerca del manejo de desechos utilizando insectos en el seminario celebrado en honor del profesor Erik Dahlquist. Erik Dahlquist es profesor de Tecnología Energética en la Universidad de Mälardalen y, gracias a su larga experiencia en mejoramiento de eficiencias de procesos, participó en el desarrollo conjunto del sistema de ventilación utilizado en el sistema de tratamiento mediante larvas de mosca (BSF). Pudimos escuchar otras presentaciones muy interesantes sobre las baterías necesarias para un futuro libre de combustibles fósiles y la historia del desarrollo del robot colaborativo YuMi en ABB. Erik terminó el seminario presentando el desarrollo de la producción y el uso de energía en Suecia desde la década de 1950 hasta hoy, y dio un pronóstico de lo que se puede esperar hasta 2090. ¡Fue muy interesante! Erik se está retirando, pero trabajará a tiempo parcial como Profesor Senior a partir del próximo año. Esperamos que esta gran colaboración continúe, y le deseamos a Erik buena suerte en el futuro, y más tiempo con la familia y sus emprendimientos en el triatlón.

Las larvas BSF alimentadas con pan engordan

¿Cómo cambia el contenido y composición de grasa en las larvas de la mosca del soldado negro (Hermetia illucens) con la dieta que se les proporciona? En nuestro último artículo publicado en Waste Management, Nils Ewald y coautores aportan nuevos conocimientos sobre este tema. El estudio se basa en once ensayos en los que las larvas fueron alimentadas con dietas basadas en mejillones, pescado, pan y desperdicios de alimentos. Se encontró que la grasa de las larvas contenía principalmente ácidos grasos saturados (especialmente ácido láurico), pero también que es afectada por el peso de las larvas y su dieta. Por ejemplo, las larvas alimentadas con mejillones y peces contenían EPA y DHA, ácidos grasos Omega-3 que son valiosos para la acuicultura. Sin embargo, se descubrió que los niveles de estos ácidos grasos eran demasiado bajos para reemplazar el aceite de pescado en el alimento para peces, pero que podrían usarse para reemplazar la fracción de aceite vegetal. Otras posibles aplicaciones de la grasa larval podrían ser la producción de alimentos o combustible.

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Nueva publicación en pretratamiento de cáscaras de banana para compostaje BSF

Alice Isibika y coautores han publicado un nuevo estudio en la revista Waste Management, sobre distintos pretratamientos para mejorar la bioconversión del compostaje con moscas soldado negro (BSF) de cáscaras de plátano (un sustrato fibroso cuyo ratio de nutrientes no es óptimo para tal compostaje). Los pretratamientos aplicados fueron: nitrógeno no proteico (para optimizar el ratio carbono/nitrógeno), calor e inoculación de microbios (hongos y bacterias) para descomponer compuestos complejos en formas más fácilmente disponibles para el compostaje BSF. Descubrieron que la adición directa de solución de amoniaco en la cáscara de plátano y la adición de hongos (Trichoderma, Rhizopus) y bacterias (bacterias intestinales BSF) mejoraron la eficacia del compostaje BSF, mientras que el tratamiento térmico no mostró ningún efecto. Respecto al pretratamiento microbiano, se determinó que 14 días es el tiempo requerido para lograr suficiente degradación de las cáscaras de plátano para compostaje BSF.

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The Susana webinar on Sanitation and Employment aired 21/11 is now available online

In this seminar, moderated by Alejandro Jiménez of the Stockholm International Water Institute, different aspects of employment in the sanitation sector are discussed. Rémi Kaupp from WaterAid tells us about the findings presented in a new WHO report on the Health, Safety and Dignity of Sanitation Workers. Martin Mawajje from the University of KwaZulu-Natal (South Africa) describe how the emptying services in informal settlements can be formalised using a case from Kampala, Uganda as example. Daniel Ddiba, from the Stockholm Environment Institute tells us about a tool they have developed called REWAMP that can estimate and compare the circular economy potential of sanitation derived products from different sanitation technologies. The last presenter is Cecilia Lalander from our group that gives an example on how black soldier fly larvae treatment can be implemented by a sanitation entrepreneur. 

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Waste management with insects was presented in Honour of Professor Erik Dahlquist

Thursday last week (31/10), Björn and Cecilia from the Environmental Engineering group visited Västerås and presented about waste management using insects in the seminar held in Honour of Professor Erik Dahlquist. Erik Dahlquist is Professor in Energy Technology at the Mälardalen University and has with the help of his long experience in improvements of process efficiency development co-developed the ventilation system used in the fly larvae treatment system. We got to listen to other very interesting presentations on the batteries needed for our fossil free future and we got to listen to the tale of the development of the collaborative robot YuMi at ABB. Erik finished the seminar presenting the development of energy production and usage in primely Sweden  from the 1950s till today and gave a prognoses of what can be expected up till 2090. Very interesting! Erik is to be retired but will work part time as Senior Professor from the start of next year. We hope for continued great collaboration and wish Erik good luck in future and more time  with family and his triathlon endeavours. 

Larvae fed bread get really fat

How does the fat content and composition in the larvae of the black solider fly (Hermetia illucens) change with the diet provided to them? In our latest article published in Waste Management, Nils Ewald and co-authors brings new knowledge on this topic. The study is based on eleven feeding trials were the larvae were fed diets based on mussels, fish, bread and food waste. The larval fat was found to contain mainly saturated fatty acids, especially lauric acid, but was also affected by the weight of the larvae and the diet. For example, the larvae fed with mussels and fish contained EPA and DHA – Omega- 3 fatty acids that are valuable for aquaculture. However, the levels of these fatty acids were found to be too low to replace fish oil in fish feed but could potentially be used for replacing the vegetable oil fraction. Other possible applications of the larval fat could be in the production of food or fuel.

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