The Influence of Industrial Wastewater on the Energy Consumption and the Efficiency of Technological Processes in Municipal Wastewater Treatment Plant

In recent years, the municipal WWTP operated by PEWIK Gdynia receives increasing quantity of industrial wastewater with COD/BOD ratio above 2. In most cases, it is probably due to the required reduction of certain pollutants before delivery of industrial wastewater to the sewage system. Implemented pre-treatment of industrial wastewater by on-site plants usually remove the nutrients and easily biodegradable organic matter, while other organic fractions are directed to the municipal WWTP. In this study the influence of industrial wastewater on the efficiency of technological processes was analyzed on the basis of WWTP in Gdynia-Debogorze. For this reason, the COD fractions (readily (soluble) and slowly (particulate) biodegradable fraction, and non-biodegradable soluble (inert) and particulate fraction) were analyzed in raw wastewater. Obtained results were discussed in terms of the efficiency of treatment processes as well as the energy consumption and the operating costs of the plant

Thermal disintegration as a process supporting sewage sludge utilization

Highly effective methods of biological and chemical wastewater treatment applied in Poland resulted in an increased amount of generated sewage sludge, which pose serious problem related to its utilization. The purpose of this studies was to determine the impact of the thermal disintegration process (in low temperatures 70%) already at a temperature of 45°C. At the same time, the concentration of volatile fatty acids (VFAs) increases more than 55 times, which can significantly shorten the fermentation process