The wastewater from industries vari

The wastewater from industries varies so greatly in both flow and pollutional
strength.The wastewater from industries varies so greatly in both flow and pollutional
strength. So, it is impossible to assign fixed values to their constituents. In general,
industrial wastewaters may contain suspended, colloidal and dissolved (mineral and
organic) solids. In addition, they may be either excessively acid or alkaline and may
contain high or low concentrations of colored matter. These wastes may contain inert,
organic or toxic materials and possibly pathogenic bacteria. These wastes may be
discharged into the sewer system provided they have no adverse effect on treatment
efficiency or undesirable effects on the sewer system. It may be necessary to pretreat
the wastes prior to release to the municipal system or it is necessary to a fully
treatment when the wastes will be discharged directly to surface or ground waters