Enhanced nitrogen removal of low carbon wastewater in denitrification bioreactors by utilizing industrial waste toward circular economy

Circular Bio-economy—Paradigm for the Future: Systematic Review of Scientific Journal Publications from 2015 to 2021

“…The sugarcane bagasse which is left behind after the production of sugar and/or ethanol may well be used as a fuel in-plant, and potato pulp from the starch industry may be used as animal feed, but researchers have discovered that the structural properties of bio-based composites with agro-industrial wastes, like sugarcane bagasse fibres/potato pulp/torrefied coffee husk flour/flaxseed flour + linseed-derived oils/ bacterial cellulose nano-crystals/poultry feathers/hydrothermally carbonised cellulose in them as fillers, are enhanced, making them fit for structural, semi-structural and non-structural applications [60-62, 134-136, 176]. Potato residues, as carbon sources, can be used for the biological denitrification of wastewater from aquaculture, making it fit for recirculation and ensuring sustainable fish production [63]. The potential of modified lignocellulosic biomassforestry wastes like pine/spruce wood and agricultural wastes like wheat/barley straw-to adsorb oil spills (diesel, crude oil), dyes and contaminant heavy metals from both wastewater and the hydrosphere (aiding effective remediation), has been explored by researchers who have uncovered synergies whereby the co-production of sugars which are raw materials for the biofuel industry will cover the expenses of the pre-treatment of the bio-based adsorbents [24].…”

Microbiota for Nitrogen Removal in Wastewater Treatments and Marine Environments: Advocating Communication and Interactive Research

“…Apart from cross-inoculation among different treatment containers/pools, N removal microbiota accumulated in wastewater treatments are frequently isolated from terrestrial systems or coastal belts (e.g., aquiculture ponds) due to the convenience in sample collection and storage. Despite the success for N elimination in many cases, N removal processes in wastewater treatment face several challenges (Table 1), especially low efficiencies when dealing with brackish wastewater, unsteady carbon supply, redox potential variability and temperature decreases triggered by cold weather (Kiani et al, 2020;Gao and Xiang, 2021). Pollutants in sewage, such as heavy metals and antibiotics, also commonly depress the efficiency of N removal in those treatments (Buelow et al, 2020).…”

Transitioning into circular food consumption practices: An analytical framework

“…In this chapter, we propose a framework of circular food consumption practice (CFCP). Circular economy (CE) research has devoted so far wide attention to theoretical aspects (Geissdoerfer et al, 2017;Kirchherr et al, 2017;Korhonen et al, 2018), industrial networks (Baldassarre et al, 2019;Mishra et al, 2019;Nogalski et al, 2019), business models (Bocken et al, 2016;Urbinati et al, 2017;Geissdoerfer et al, 2018), and technologies (Blank et al, 2020;Holanda et al, 2020;Kiani et al, 2020). However, the role of individuals for transitioning into a closed-loop-based economic system has been disregarded.…”