ABSTRACT
Liquid waste may be defined as the water produced from the domestic and industrial establishments in the form of a waste. It has also been referred to in literature as sewage and/or municipal wastes. It contains less than 1% solids and the rest is water, which serves as a carrier. The domestic waste component of liquid waste is mostly biodegradable, whereas the industrial one depends on the type of industry from which they originate. Industrial establishments such as food processing including canning, abattoirs, tanneries, etc. carry biodegradable wastes, whereas the chemical industries such as electroplating, paper pulp manufacturing, paints, motor vehicle manufacturers produce wastes that may contain non-biodegradable and even intractable wastes. Often these wastes are provided preliminary treatment on site before their discharge for future treatment at a centralized treatment facility. Other sources of liquid waste, which are discharged to sewerage include institutions such as hospitals, hostels, hotels, airports, recreational facilities and in some instances storm water.
