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
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According to Semblante et al. (2014) the AS process involves the transformation of dissolved and suspended organic matters by a consortium of micro-organisms to gases and settlable biomass or sludge. While biological treatment offers high organic removal efficiency, it also entails significant sludge production, which contains active (live) and inactive (dead) micro-organisms and must be treated prior to disposal to prevent adverse impact on public health and the environment. Sludge production depends on different factors such as biodegradability of the organic pollutants, mass loading of the treatment plant, degradation rate of microbial cells by endogenous respiration or cellular lysis and existence of predator bacteria (Rocher et al., 1999).
Due to the nature of AS treatment and the slaughterhouses’ influent composition, a large amount of excess sludge is generated daily. Treatment and disposal of the excess sludge eats up 20-60% of the total operational cost of an activated sludge treatment plant (Foladori et al., 2010; Yu Liu 2001; Yang et al., 2011). In addition and according to Mercalf and Eddy, (2003) the ultimate disposal of treated sludge by landfill creates environmental challenges in the densely populated areas. The management and treatment of the produced sludge accumulates more than 50% of the construction and

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