PILOT-SCALE, HIGH-STRENGTH INDUSTRIAL WASTE-WATER TREATMENT EVALUATION BY MATHEMATICAL-MODELING

An existing rendering plant wastewater treatment facility has to be up graded to meet the newly set British and more stringent EC effluent st andards. After detailed analysis it turned out, that the existing trea tment plant cannot be upgraded, a new plant has to be built, The rende ring plant processes slaughterhouse wastes. The wastewater contains ea sily biodegradable organic substances, mainly organic acids, organic b onded nitrogen and ammonia. According to the new effluent standards th e main task, besides the organic removal was the complete removal of n itrogen. The aim of this study was to find out the best available tech nology and the basic wastewater design data. For this purpose, on site pilot scale experiments were carried out. In several test runs the in fluent BOD and TKN have varied of between 1400-5500 and 460-1120 mg/l, respectively. Based on the experimental results, single-sludge nitrif ication-denitrification technology was selected for the full scale tre atment plant. The plant was extended by chemical phosphate removal app lying the post-precipitation method. In addition to the experimental s chedule, a mathematical model of the plant was developed for two purpo ses. to verify the applicability of the general activated sludge model under high concentration influent conditions, and to generalize exper imental results and provide a tool to predict plant performance under full scale conditions. On the basis of successful pilot plant experime nts and model calibration, full scale plant design parameters were det ermined and presented. The full scale plant Is under construction.