Anaerobic digestion of tannery waste: Semi-continuous and anaerobic sequencing batch reactor processes
2010
Zupančič, Gregor D. | Jemec, A.
Disposal of the vast amounts of tannery waste that are currently generated is a significant problem. Anaerobic treatment of different types of tannery waste (fleshings, skin trimmings and wastewater sludge) was investigated. The biochemical methane potential is the same at 37°C or 55°C and an assay of this was shown to be an appropriate screening tool with which to estimate the susceptibility of a substrate to anaerobic digestion. The start-up procedure of a tannery waste thermophilic anaerobic digestion in 100days using seed from mesophilic digester processing municipal sludge is presented. The specific methane production potential at 55°C is estimated to be 0.617m³ kg⁻¹ of volatile suspended solids for tannery waste sludge, 0.377m³ kg⁻¹ for tannery waste trimmings and 0.649m³ kg⁻¹ for tannery waste fleshings. Additional concerns such as chromium content, salinity and temperature fluctuations were also addressed. Chromium content and salinity showed no adverse effects; however a reactor temperature reduction of 4.4°C led to a drop in biogas production of 25%, indicating a requirement to keep the temperature constant at 55°C.
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