Stabilisation of municipal solid waste after autoclaving in a passively aerated bioreactor

Abstract

Autoclaving of unsorted municipal solid waste is one of the solutions in waste management that maximises the amount of waste for recycling. After autoclaving, however, a large part of the waste is composed of unstabilised biodegradable fractions (organic remaining fraction, ORF), which may comprise up to 30% of autoclaved waste and cannot be landfilled without further stabilisation. Thus, the aim of this study was to investigate the effectiveness of aerobic stabilisation in a passively aerated reactor of organic remaining fraction after full-scale autoclaving of unsorted municipal solid waste. The organic remaining fraction had a volatile solids content of ca. 70%, a 4-day respiration activity test (AT4) of ca. 26 g O₂ kg^–1 total solids and a 21-day gas formation test (GP21) of ca. 235 dm³ kg^–1 total solids. Stabilisation was conducted in a 550 L reactor with passive aeration (Stage I) and a periodically turned windrow (Stage II). The feedstocks consisted entirely of organic remaining fraction, or of organic remaining fraction with 10% inoculum (ORF + I). Inoculum constituted product of stabilisation of organic remaining fraction. During stabilisation of organic remaining fraction and ORF + I, thermophilic conditions were achieved, and the decreases of volatile solids, AT4 and GP21 could be described by 1 order kinetic models. The rate constants of volatile solids removal (k_VS) were 0.033 and 0.068 d^–1 for organic remaining fraction and ORF + I, respectively, and the thermophilic phase was shorter with ORF + I (25 days vs. 45 days). The decrease in GP21 corresponded to volatile solids decrease, but AT4 decreased sharply during the first 10 days of waste stabilisation in the reactor, indicating that the content of highly biodegradable organic matter decreased during this time.

Keywords

Autoclaving organic remaining fraction aerobic stabilisation passive aeration municipal solid waste

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References

Adani

Baido

Calcaterra

et al . (2002) The influence of biomass temperature on biostabilization–biodrying of municipal solid waste. Bioresource Technology 83: 173–179.

Alburquerque

Gonzálvez

Tartosa

et al . (2009) Evaluation of “alperujo” composting based on organic matter degradation, humification and compost quality. Biodegradation 20: 257–270.

Anon (2001) Verordnung über die umweltverträgliche Ablagerung von Siedlungsabfällen (AbfAblV), BGBL.

Baptista

Antunes

Gonçalves

et al . (2010) Composting kinetics in full-scale mechanical–biological treatment plants. Waste Management 30: 1908–1921.

Bustamante

Paredes

Marhuenda-Egea

F-C

et al . (2008) Co-composting of distillery with animal manures: Carbon and nitrogen transformations in the evaluation of compost stability. Chemosphere 72: 551–557.

Brewer

Sullivan

(2003) Maturity and stability evaluation of composted yard trimmings. Compost Science and Utilization 11: 96–112.

Binner

Böhm

Fechner

(2012) Large scale study on measurement of respiration activity (AT4) by Sapromat and OxiTop. Waste Management 32: 1752–1759.

Council Directive 1999/31/EC of 26 April 1999 on the landfill of waste.

Dach

(2010) Wpływ dodatku różnego rodzaju słomy na dynamikę i wielkość emisji amoniaku z kompostowanych osadów ściekowych [Influence of different straw kind additive on the process dynamics and size of ammoniaemission from composted sewage sludge. In Polish]. Journal of Research and Applications in Agricultural Engineering 55: 8–13.

10.

Dach

Wolna-Maruwka

Zbytek

(2009) Wpływ dodatku efektywnych mikroorganizmów (EM) ma przebieg procesu kompostowania i wielkość emisji gazowych [Influence of effective microorganisms addition (EM) on composting process and gaseous emission intensity. In Polish]. Journal of Research and Applications in Agricultural Engineering 54: 49–55.

11.

Defra Report (2013) Mechanical Heat Treatment of Municipal Solid Waste. Department for Environment Food and Rural Affairs. Available at: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/221040/pb13891-heat-treatment-waste.pdf (accessed 14 November 2018).

12.

Eklind

Kirchmann

(2000) Composting and storage of organic household waste with different litter amendments. I. Carbon turnover. Bioresource Technology 74: 115–124.

13.

Friege

Fendel

(2011) Competition of different methods for recovering energy from waste. Waste Management & Research 29: S30–S38.

14.

García

Maulini

Torrente

et al . (2012) Biological treatment of the organic fibre from the autoclaving of municipal solid wastes; preliminary results. Biosystems Engineering 112: 335–343.

15.

Hamoda

Abu Qdais

Newham

(1998) Evaluation of municipal solid waste composting kinetics. Resources, Conservation and Recycling 23: 209–223.

16.

Hung

Z-S

Tseng

S-L

Liu

K-W

et al . (2012) Autoclaving of waste plastic-free papers for resource recovery and reutilization. Fresenius Environmental Bulletin 21: 2486–2493.

17.

Kasiński

Wojnowska-Baryla

(2014) Oxygen demand for the stabilization of the organic fraction of municipal solid waste in passively aerated bioreactors. Waste Management 34: 316–322.

18.

Kulikowska

(2016) Kinetics of organic matter removal and humification progress during sewage sludge composting. Waste Management 49: 196–203.

19.

Lakshmikanthan

Sivakumar Babu

(2017) Performance evaluation of the bioreactor landfill in treatment and stabilisation of mechanically biologically treated municipal solid waste. Waste Management & Research 35: 285–293.

20.

Ahang

Liu

et al . (2013a) Comparison of methane production potential, biodegradability, and kinetics of different organic substrates. Bioresource Technology 149: 565–569.

21.

Zhang

Liu

et al . (2013b) Evaluating methane production from anaerobic mono- and co-digestion of kitchen waste, corn stover, and chicken manure. Energy Fuels 27: 2085–2091.

22.

Lornage

Redon

Lagier

et al . (2007) Performance of a low cost MBT prior to landfilling: Study of the biological treatment of size reduced MSW without mechanical sorting. Waste Management 27: 1755–1764.

23.

Magalhaes

AMT

Shea

Jawson

et al . (1993) Practical simulation of composting in the laboratory. Waste Management & Research 11: 143–154.

24.

Papadimitriou

(2007) Evaluating the effect of autoclaving on the rate of bioprocessing of waste-characteristics of autoclaving condensate and autoclaved biodegradables from non-segregated MSW. Report to Defra. University of Leeds, UK Waste Implementation Programme.

25.

Paredes

Roig

Bernal

et al . (2000) Evolution of organic matter and nitrogen during co-composting of olive mill wastewater with solid organic wastes. Biology and Fertility of Soils 32: 222–227.

26.

Shao

LM.

Yang

et al . (2012) Biodrying of municipal solid waste under different ventilation modes: Drying efficiency and aqueous pollution. Waste Management & Research 30: 1272–1280.

27.

Von Felde

Doedens

(1999) Full-scale experiences with mechanical–biological pretreatment of municipal solid waste and landfilling. Waste Management & Research 17: 520–526.

28.

Waste Framework Directive 2008/98/EC of 19 November 2008 on waste.

29.

Zach

Binner

Latif

(2000) Improvement of municipal solid waste quality for landfilling by means of mechanical–biological pretreatment. Waste Management & Research 18: 25–32.