Case Study: Zero Sludge Production of a Slaughterhouse’s Wastewater Treatment Plant.

Case Study: Zero Sludge Production of a Slaughterhouse’s Wastewater Treatment Plant.

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Slaughterhouses produce high strength wastewater (EC, 2005), which contain high levels of biodegradable organic matter, as faecal, undigested food, blood, suspended material (Jian and Zhang, 1999). Slaughterhouse wastewater composition in terms of organic strength, inorganic elements, alkalinity, and pH is adequate for biological treatment (Massé and Masse, 2000). Design criteria for slaughterhouse wastewater treatment plants are widely published (Travers & Lovett, 1984; Li et al, 2008).
Generally, variations in slaughterhouse wastewater composition are significant, depending on the production procedures, byproducts’ recovery and cleaning procedures (Pozo et al., 2003). The high biochemical oxygen demand (BOD) to chemical oxygen demand (COD) ratio suggests an easily biodegradable wastewater, the relatively low BOD to total Kjeldhal nitrogen (TKN) ratio suggests a need for nitrification and possibly even nitrogen removal and finally the relatively high total suspended solids (TSS) characterize the slaughterhouses’ wastewater (Chen and Lo, 2003; Lovett et al., 1984). The TKN values are highly dependent on the blood handling process of the slaughterhouse. The concentration of contaminants in slaughterhouses wastewater vary, with COD, TKN and TSS concentration ranging from 1000-20000 mg L-1, 150-10000mg L-1 and 250-5000mg L-1 respectively (Li et al, 2008). For large scale slaughterhouses, on-site biological treatment is recommended by the European Commission to remove organic carbon and nutrients before the wastewater is discharged to surface water or local wastewater treatment plants (EC, 2005). This has forced many industries to treat their wastewater to a level obtainable by implementing the best available technology for wastewater ...

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...s for the management of biosolids. Environmental Science and Pollution Research 15, 308–317.
31. Wei Y., Van Houten R. T., Borger A. R., Eikelboom D, H., Fan Y., 2003. Minimization of excess sludge production for biological wastewater treatment. Water Research 37, 4453-44671.
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33. Yang, S.-S., Guo, W.-Q., Zhou, X.-J., Meng, Z.-H., Liu, B., Ren, N.-Q., 2011. Optimization of operating parameters for sludge process reduction under alternating aerobic/oxygen-limited conditions by response surface methodology. Bioresour. Technol. 102, 9843–9851.
34. Yamamoto K, Hiasa M, Mahmood T, Matsuo T. Direct solid±liquid separation using hollow fibre membrane in an activated sludge aeration tank. Water Sci Technol 1989;21:43±54.

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