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Open source developing, designing and constructing small urban areas with re-used demolition waste in the city of Utrecht

From the article: "ABSTRACT: The research group Supply Chain Redesign in the Built Environment of HU University of Applied Sciences is working on research that combines principles of the circular economy with open source architectural design & urban planning. The aim is finding new ways to re-use demolition waste and recycled materials in small scale urban area developments. And to “democratize” traditional processes in the built environment. Different recent studies have shown the potential benefits, such as a reduction of emissions. In “Hof van Cartesius”, a practical case-study in Utrecht, the ambitions and implications of this approach are being questioned, investigated and tested."

Understanding the Governing of Urban Commons

Urban commons is presented as a challenge of collaborative governance. This study delivers a normative perspective to analyse and evaluate processes and outcomes of the governance of urban commons. It demonstrates the development and application of the perspective in action research on Amsterdam’s Zero Waste Lab case, as a way to better understand successful and failing institutions in a concrete practice and to design interventions for improvement. Consequently, the (im)plausibility of collective action in urban communities and the participation of public actors present dilemmas for urban commons. The study specifically synthesises urban commons and collaborative governance scholarship and relates also in general to the transition towards co-creation in governing the city, e.g. in public administration or planning.

Stimulating entrepreneurs to make use of waste streams

The circular economy applied to local communities

Based on a theoretical discussion the main difference between models of lineair economy and circular economy are elaborated; (1) Elimination of waste is essential the circulation of circular flows and reclamation of (raw) materials; this requires mechanisms for the return of obsolete materials. (2) Design for circularity; designers need to design for use, disassembly and reclaiming of materials. (3) Dilemma of ownership; who is the owner of the (raw) materials and who is responsible for upscaling waste to raw materials? (4) The circularity of operationals processes such as energy use, production, distribution and transport is also essential.The application of circular economy to resillient communities is empirically illustrated with comparative case studies to show its practical and theoretical value. The emperical cases are taken from te communities of Saerbeck and Lathen (both in Germany), the Spanish Island of El Hierro and the redevelopment of the former sugar factory in Groningen, the Netherlands. Data has been collected through semi-structured interviews and document analysis.The paper concludes by stating that many communities in todays globalised context have become dependent on their larger surrounding network for many resources and that an agenda of local resillience reverts the focus on the qualities and resources within the community. One communities build local reslillience it may boost communal self confidence and social cohesion. The circular economy approach can assist transition.

Enhanced Biogas Production from the Anaerobic Batch Treatment of Banana Peels

Waste disposal management and the energy crisis are important challenges facing most countries. The fruit-processing industry generates daily several tons of wastes, of which the major share comes from banana farms. Anaerobic digestion (AD) technology has been applied to the treatment of wastewater, animal slurry, food waste, and agricultural residues, with the primary goals of energy production and waste elimination. This study examines the effect of organic loading (OL) and cow manure (CM) addition on AD performance when treating banana peel waste (BPW). The maximum daily biogas production rates of banana peels (BPs) with a CM content of 10%, 20%, and 30% at 18 and 22 g of volatile solids (gvs) per liter were 50.20, 48.66, and 62.78 mL·(gvs·d)−1 and 40.49, 29.57, and 46.54 mL·(gvs·d)−1, respectively. However, the daily biogas yield showed no clear interdependence with OL or CM content. In addition, a kinetic analysis using first-order and cone models showed that the kinetic parameters can be influenced by the process parameters.

Determination of monomer ratios in commercial polyhydroxyalkanoates using NMR and GC-MS

Plastic is one of the biggest contributors to pollution of the planet. Due to the low recyclability of oil-based plastics, most plastic is being disposed into the environment. According to plastic oceans, 10 million tons of plastic are dumped into oceans annually. Currently, researchers are developing recycling methods for oil-based plastics and are looking for biobased alternatives. One of these alternatives are a class of polymers called polyhydroxyalkanoates (PHA’s). PHA’s differ from other biobased polymers, due to the process of fabrication. PHA’s are a natural polymer, acting as an energy and carbon storage for different strains of bacteria. Functioning as an energy storage, nature can break down PHA’s and PHA-based waste. (1) Different companies are working on PHA’s production, but a large deviations in physical properties were observed. This research aims to establish a relationship between the chemical and physical properties of the different PHA’s, using gel permeability chromatography (GPC), nuclear magnetic resonance (NMR) and gas chromatography-mass spectroscopy (GC-MS).