ABSTRACT
Aer water is used in households, businesses, and industries, it is collected in a sanitary sewer system and sent to the local wastewater treatment facility. Industrial wastewater may be treated and released directly into the receiving body of water or into the municipal sanitary sewer system. In the latter case, the industrial euent most oentimes receives some pretreatment before it can be disposed of in the sanitary sewer system in line with guidelines stipulated by various countries. In the United States, regulation is under the Clean Water Act and a discharger is required to meet certain technology based euent limits and perform euent monitoring [24]. In Nigeria, industrial euent discharge is regulated by the National Environmental Standard Regulatory Agency (NESREA). Furthermore, stormwater sewer systems that collect runo from urban streets join the sanitary system and the combination of wastewaters ow to the municipal wastewater treatment plant (WWTP). ese combined systems have their disadvantages. During rains, they oen carry more wastewater than the local treatment plant can handle. When that happens, a portion of the ow, which includes raw sewage, must be diverted around the treatment plant and released directly into the receiving water at the cost of public health. Separating these combined systems is immensely expensive, a probable solution is to create massive reservoirs usually underground that store the combined ow until the storm passes aer which time the reservoir is slowly drained back into the sanitary sewer system [24].
