Waste Water
<p ><b>Wastewater</b>, also spelled <b>waste water</b>, is any <a href="http://en.wikipedia.org/wiki/Water" title="Water" >water</a> that has been adversely affected in quality by <a href="http://en.wikipedia.org/wiki/Human_impact_on_the_environment" title="Human impact on the environment" >anthropogenic</a> influence. It comprises liquid waste discharged by domestic residences, commercial properties, industry, and/or agriculture and can encompass a wide range of potential <a href="http://en.wikipedia.org/wiki/Water_pollution" title="Water pollution" >contaminants</a> and concentrations. In the most common usage, it refers to the municipal wastewater that contains a broad spectrum of contaminants resulting from the mixing of wastewater from homes, businesses, industrial areas and often <a href="http://en.wikipedia.org/wiki/Storm_drain" title="Storm drain" >storm drains</a>, especially in older sewer systems. Municipal wastewater is usually treated in a <a href="http://en.wikipedia.org/wiki/Combined_sewer" title="Combined sewer" >combined sewer</a>, <a href="http://en.wikipedia.org/wiki/Sanitary_sewer" title="Sanitary sewer" >sanitary sewer</a>, <a href="http://en.wikipedia.org/wiki/Effluent_sewer" title="Effluent sewer" >effluent sewer</a> or <a href="http://en.wikipedia.org/wiki/Septic_tank" title="Septic tank" >septic tank</a>.</p>
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<a href="http://en.wikipedia.org/wiki/Sewage" title="Sewage" >Sewage</a> is the subset of wastewater that is contaminated with<a href="http://en.wikipedia.org/wiki/Feces" title="Feces" >feces</a> or <a href="http://en.wikipedia.org/wiki/Urine" title="Urine" >urine</a>, but is often used to mean any wastewater. Sewage includes domestic, municipal, or industrial liquid <a href="http://en.wikipedia.org/wiki/Waste" title="Waste" >waste</a>products disposed of, usually via a <a href="http://en.wikipedia.org/wiki/Pipeline_transport" title="Pipeline transport" >pipe</a> or sewer (sanitary or combined), sometimes in a <a href="http://en.wikipedia.org/wiki/Cesspool_emptier" title="Cesspool emptier" >cesspool emptier</a>.</p>
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<a href="http://en.wikipedia.org/wiki/Sewerage" title="Sewerage" >Sewerage</a> is the physical infrastructure, including pipes, <a href="http://en.wikipedia.org/wiki/Pump" title="Pump" >pumps</a>, screens, channels etc. used to convey sewage from its origin to the point of eventual treatment or disposal. It is found in all types of sewage treatment, with the exception of septic systems, which treat sewage on-site.</p>