Abstract The presence of xenobiotic compounds in biological wastewater treatment processes with activated sludge may reduce microbial communities, disrupt diversity, and diminish system performance. Shock loads unusual operating events these systems have negative impacts on their efficiency reliability for pollutant degradation, thereby posing high risk to microorganisms water quality receiving...

in pakistan besides pesticide contamination from agricultural field, the manufacturing industriesare also contributing relatively high quantities of toxic pesticides into the environment. these pesticides maybe toxic, mutagenic or carginogenic and may be bioaccumulated or biomagnified by the biota. because ofpersistent nature of pesticides, its removal from environmental system become difficult...