Industrial wastewater vastly contains various ranges of impurities which largely contaminates environment for this reason alone, the industrial wastewater treatment constitutes a very special task. Additionally, in most of the developing countries the emmisions norms for industrial effluent discharge are constantly being tightened up and closely monitored by competent authorities. Closed circuits and product recovery in various production processes are becoming an increasing priority among manufacturing companies. These measures represent an additional contribution to the protection of aquatic eco-systems and possess great cost-cutting potential. Apa Heuristic can refer to long-term experience in the industrial wastewater treatment sector. The resulting expertise is advantageously employed for the technical and economic optimisation of every subsequent facility. The treatment process may contain mechanical, biological and chemical physical process steps. In the case of biological systems, we offer both aerobic and and aerobic systems – predominetely used as UASB (Up-flow anaerobic sludge blanket process). Other systems are also effectively used with respect to the characteristics of the wastewater. The most frequently used methods were, single stage and multiple stage activated sludge process and high performance attached growth process for less and largely polluted wastewater systems. In the case of stringent treatment requirements, mainly for the water re-use applications. We employ membrane processes with submerged or external membranes. The advantages are very large extent of water saving for process applications and practically zero discharge of wastewater. Following processes are used: Aerobic biological processes Anaerobic biological processes Chemical-physical processes Apa Heuristic has realised effluent treatment concepts in the widest variety of industrial branches including aerobic and anaerobic/aerobic systems for the textile effluent applications, food and pharmaceutical applications, power plants systems and membrane processes for the chemical industry and wastewater reuse schemes for diverse branches.