Value Addition of Anaerobic Digestate From Biowaste: Thinking Beyond Agriculture

Kaur, Guneet; Wong, Jonathan W C; Kumar, Rajat; Patria, Raffel Dharma; Bhardwaj, Anuja; Uisan, Kristiadi; Johnravindar, Davidraj

doi:10.1007/s40518-020-00148-2

Cited by 22 publications

(15 citation statements)

References 42 publications

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“…Capacity x = 7884 t x × 2100 kg RL per batch (5) where Capacity x is annual production capacity in a specific scenario and t x is processing time per batch in a specific scenario (Table 1). The important correlation to note from Equation ( 5) is that when the processing time per batch decreases, the annual production capacity increases, thereby increasing the productivity and profitability.…”

Section: Mass Balancementioning

confidence: 99%

“…It is estimated that 90-95% of feed added to the digester ends up in the digestate. Thus, with the increasing global prevalence of AD, increasing quantities of digestate are being generated which could therefore lead to the imminent risk of digestate becoming a 'new waste' in the near future [5]. For example, 80 million tons of digestate were produced in the EU from 117 AD plants processing organic material including food waste, farm waste, manure, etc.…”

Section: Introductionmentioning

confidence: 99%

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Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis

Patria

Wong

Johnravindar

et al. 2021

Sustainable Chemistry

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The present work evaluates the techno-economic feasibility of a rhamnolipids production process that utilizes digestate from anaerobic digestion (AD) of food waste. Technical feasibility, profitability and extent of investment risks between fermenter scale and its operating strategy for rhamnolipids production was investigated in the present study. Three scenarios were generated and compared: production using a single large fermenter (Scenario I), using two small fermenters operated alternately (Scenario II) or simultaneously (Scenario III). It was found that all the scenarios were economically feasible, and Scenario III was the most profitable since it allowed the most optimum fermenter operation with utilization of multiple small-scale equipment to reduce the downtime of each equipment and increase the production capacity and overall productivity. It had the highest net present value, internal rate of return and shortest payback time at a discount rate of 7%. Finally, a sensitivity analysis was conducted to indicate how the variation in factors such as feedstock (digestate) cost, rhamnolipids selling price, extractant recyclability and process capacity influenced the process economics. The work provides important insights on techno-economic performance of a food waste digestate valorization process which would be useful to guide its sustainable scale-up.

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Section: Mass Balancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis

Patria

Wong

Johnravindar

et al. 2021

Sustainable Chemistry

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“…This involves the implementation of not only appropriate teamwork, planning, appraisal and reward structures but also tailoring the structures in such a way that they modify managerial and staff behaviours and an overall culture of performance [24]. Similar to HPO proponents, HPWS advocates such as Schuler and Jackson [36] and more recently, Murthy and Naidu [38] and Kaur et al [39], also believe in using value-creation mechanisms to increase performance and minimise waste. Therefore proponents of both models believe that the adoption of flatter structures such as teamwork and incentivisation schemes could encourage staff commitment and buy-in and, as such, less resistance to the performance measures [40].…”

Section: Performance Management Theorymentioning

confidence: 99%

Beyond HRM’s Performance Management: Towards Strategic Workforce Resilience

Mendy¹

2021

Beyond Human Resources - Research Paths Towards a New Understanding of Workforce Management Within Organizations

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HRM professionals’ reliance on using teamwork, organisational planning and managerially- controlled appraisal measures within the framework of High Performance Organisation (HPO) and High Performance Work Systems (HPWS) has outlived its useful applicability and sustainability in today’s SME crisis-ridden environment. This chapter highlights the gap between the HRM discipline, whose measures to resolve the organisational performance problem have instead resulted in a deepening of the performance crisis in resource-constrained SMEs and an urgent need to address such a fundamental problem through the creation, development and sustenance of more innovative measures. A critique of HPO and HPWS’s structural and systemic approach to solve the effective organisational performance implementation gap led to an additional discovery, which is how to solve the performance problem competently and sustainably such that SMEs have a more strategically viable future. The study’s interpretivism paradigm backed up by a survey of 85 management and staff respondents in a longitudinal study spanning 7 years in the UK highlighted 6 important themes. These were combined to develop a new ‘Strategic Workforce Resilience Management Model’ as a way to solve the SME performance quagmire. This fills the performance implementation and strategic sustainability gaps and introduces resilience characteristics into the way HRM professionals should be managing the performance problem. The limitations, the implications and future research areas are discussed.

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“…This waste is then discarded in landfills because it does not meet the quality standards imposed by legislations. However, digestate can be transformed into a resource for different industrial and agricultural processes strengthening local circular bioeconomies (Kaur et al, 2020). Digestate can be used directly or indirectly, for instance as soil amender, for element recovery, or for biomolecules production (Cesaro, 2021).…”

Section: Introductionmentioning

confidence: 99%

Trace metal fate in soil after application of digestate originating from the anaerobic digestion of non-source-separated organic fraction of municipal solid waste

Baldasso

Bonet-Garcia

Sayen

et al. 2023

Front. Environ. Sci.

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Introduction: Digestate originating from anaerobic digestion of non-source-separated organic fraction of municipal solid waste (OFMSW) is produced abundantly worldwide and generally discarded in landfills. However, it can be a valuable resource for many bioeconomy strategies as land restoration, only if a consolidated understanding of the contaminants’ presence and behaviour in digestate-amended soil is achieved. This study aimed to investigate the fate of trace metals, namely Zn, Cu, Pb, and Cr found in the digestate, along the soil profile after digestate application on soil, and the influence that other contaminants as pharmaceutical compounds can have on their behaviour in the soil system.Methods: For that, a 90-day soil column experiment was conducted using a fine loamy sand soil topped with a layer of digestate-amended soil. Digestate-amended soil had a soil to digestate proportion of 14 to 1 (dry weight). Two experimental conditions were tested: soil amended with digestate, and soil amended with digestate spiked with the antidiabetic drug metformin. Soil samples were taken at 4 depths on days 1, 7, 21, 35 and 90, and total trace metals concentrations and fractionation were determined via atomic absorption spectroscopy.Results: Results showed that Zn, Cu, Pb ad Cr initially present in the digestate were transferred from the digestate-amended soil layer to the underlying soil layer over time, although in low amounts. Nevertheless, no transfer was detected to the deeper soil layers. Trace metals in soil were predominantly in immobile and less bioavailable forms associated with clay and silicate mineral groups, whereas in the digestate-amended soil they were in more bioavailable forms, which could be related to metals’ migration in the soil layers below. Results also show that the presence of metformin had no influence on trace metal behaviour, giving insight also on possible interactions with other potentially present contaminants as microplastics.Conclusion: The current study showed that OFMSW digestate can be a promising organic nutrient-rich matrix for land restoration even if it may contain high metals’ concentrations because low metal mobility along the soil profile can be expected.

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Value Addition of Anaerobic Digestate From Biowaste: Thinking Beyond Agriculture

Cited by 22 publications

References 42 publications

Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis

Food Waste Digestate-Based Biorefinery Approach for Rhamnolipids Production: A Techno-Economic Analysis

Beyond HRM’s Performance Management: Towards Strategic Workforce Resilience

Trace metal fate in soil after application of digestate originating from the anaerobic digestion of non-source-separated organic fraction of municipal solid waste

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