THERMOPHILIC SOLID STATE ANAEROBIC DIGESTION OF OFMSW IN SEQUENTIAL BATCH REACTORS
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1 THERMOPHILIC SOLID STATE ANAEROBIC DIGESTION OF OFMSW IN SEQUENTIAL BATCH REACTORS NATAŠA BELŠAK Scientific Research Centre Bistra Ptuj SI-2250 Ptuj, Slovenia. Mauritius, September 2011
2 Introduction City Municipality of Ptuj introduced a Local programme for Environment Protection in the entire municipal area. Part of it is CONCEPT OF THE ENVIRONMENTAL PROTECTION more effective reuse of municipal waste reduce amounts of waste that is being disposed Material and Energetic Use of the Biological Part of Waste in the Region. Anaerobic digestion process
3 Introduction Landfill CERO Gajke For municipalities of the Lower Podravje Region, the construction of the CERO Gajke Waste Disposal Facility represents an optimal solution for the problem of municipal waste management, which is in accordance with Slovenian and EU standards in the fields of health and environment protection. The main characteristics of the facility are: include 17 municipalities of the Lower Podravje Region - approx inhabitants; expected lifespan of the landfill: years; expansion over an area of 18 ha, 12 ha of which is the landfill area; Lowest distance from nearly settlements: 300 m.
4 Introduction Landfill CERO Gajke Ptuj include: -waste collecting, -sorting line for separate collected waste, -composting facility, -dumpsite for mixed municipal waste.
5 Feedstock for anaerobic digestion process - wood biomass, consisting of tree and shrub pruning and old wood, - a large part of green waste consisted of grass cuttings, hedge trimmings, old flowers, weeds and leaves, - the green waste also contained food waste, mainly raw vegetable and fruit waste matter.
6 Aim of the study Investigate the anaerobic digestion process in a sequential pilot system composed of three 120 L bioreactors. The main focus of this research is determination of the effect of the leachate recirculation on the efficiency of anaerobic digestion process. operating conditions of the process: - thermophilic temperature level T = 53 ± 2 C - moisture content 70 to 80 % (solid state)
7 Aerobic phase A procedure of anaerobic digestion process aeration of input material (the temperature reached may exceed 70 C) - sanitation (pathogen reduction) - reduction of lightly degradable substances Anaerobic phase substrate irrigation with sewage sludge - ensure adequate moisture in the reactor, - addition of inoculum in the reactor, - addition of nutrients temperature control using heating cable and on - line temperature of material monitoring by means of temperature sensors, leachate recirculation - ph regulation, - humidity providing, - nutrients cerirculation and dilution of potential toxic substances.
8 determination of: - water content, - ph value, - Kjeldahl nitrogen, - total organic carbon. Feedstock analysis Moisture content/% ph TNK/% s.s. TOC/% s.s. Feedstock 58,0 ± 10,0 7,0 ± 0,7 0,67 ± 0,23 30,7 ± 6,0
9 Bioreactors and equipement
10 Bioreactors and equipement
11 Monitoring of the anaerobic digestion process Produced biogas collecting (bags of different volumes: V = 10 L, 25 L, 40 L and 100 L) Produced biogas flow monitoring
12 Monitoring of the anaerobic digestion process Monitoring biogas composition (biogas analyzer Geotechnical Instrument GA2000Plus) Monitoring leachate ph value and recirculation of leachate between the mature and new reactor
13 Results The proportion of CH 4 and CO 2 in the biogas as a function of time
14 Results Leachate ph value as a function of time
15 Conclusions Average biogas production in our research was L biogas/kg VS, and the methane production was L methane/kg VS, respectively. Recirculation of leachate between reactors has a positive effect on the anaerobic digestion process(increase of biogas production, there is not necessary ph adjustment with lime, phase separation between reactors). Feedstock used in the study had a high content of non-bio degradable lignocellulose components originating from tree and shrub pruning, old wood, grass cuttings, hedge trimmings, old flowers, weeds and leaves, therefore only 33.5 % of volatile solids were decomposed in anaerobic digestion process.
16 Conclusions Our future work will focus on process optimization and feedstock pretreatment optimization which will be carried out by fungi with the aim of reaching better degradation of lignocellulosic material. We already start with Pleurotus ostreatus cultivation on laboratory and pilot scale in collaboration with the group of researchers specialized for fungi cultivation. With the strain adapted to growth on waste material.
17 Thank you for your attention.
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