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Major pollutant components of meat processing wastewater are biodegradable organic compounds, fats and proteins in both particulate and dissolved forms. Because of the possible pollution of water sources, the efficient disposal of effluent from meat plants is important. The treatment of industrial wastewater is a highly complex process that generally involves factors associated with load fluctuations and high concentrations of organic matter. Toxic effects on aquatic organisms and plants may be caused by numerous nitrogen compounds, as well as detergents and antibiotics, in the meat industry wastewater. The aim of the research was to determine the toxicity of anaerobic treated meat industry wastewaters. The level of toxicity was determined with algae growth inhibition test and Lepidium test. The values of ErC50 (0÷96) and EbC50 of indicators were 18.4 and 8.6% respectively. TU value for ErC50 was 5.51 which meant acute toxicity of wastewater. The value of TU for EbC50 was 11.62 (high toxicity of wastewater). The values of indicators RSG (relative seed germination), RRG (relative root growth) and GI (germination index) were 92, 19.5 and 17.62% respectively. Treatment efficiency meat industry wastewater during fermentation process was very high. The COD and BOD removal efficiency were on 82.3 and 80% respectively. Effluent from ASBR reactor had following parameters: COD 206 mg O2/dm 3 and BOD 130 mg/dm3. TOC value after anaerobic process was 75 mg C/dm3 (78.1%). The concentration of ether extract and proteins were 188 and 74 mg/dm3respectively. Generated biogas in the methane fermentation process of wastewater from meat industry plants was characterized by a high methane content (77.5% vol.). Carbon dioxide and the ballast in the analyzed biogas were 20 and 2.5% respectively. In order to enrich biomass with methane by removal of CO2 from its content, the gas generated in the anaerobic process was subjected to the processes of chemisorption and adsorption on the granulated active carbons and molecular sieve. Purification the raw biogas by a molecular sieve has contributed to the increase of methane in enriched from 77.5 to 92.6% and the removal of CO2 from 20 to 5.7%. Due to poor quality and its high toxicity, effluent from ASBR reactor can not to be discharged into natural water. In the future it is suggested to incorporate RO or UF into the technological system in order to posttreatment the wastewater.

Toxicity Assessment of Treated Meat Industry Wastewater in the Anaerobic Process