Trade Wastes
Industrial trade wastes, such as those coming from canneries, breweries, woolen mills, laundries, dye and cleaning works, paper mills, iron foundries, gas works and packing establishments and others cause nuisances around disposal plants, and the problem of their proper disposal is more difficult of satisfactory solution than the treatment of domestic sewage. Some wastes can be treated with domestic sewage at the disposal works without any difficulty, others require special treatment before being allowed to enter the sewers and often it is desirable to keep certain wastes out of the main sewers and dispose of them independently. Each particular problem must be considered by itself with due regard both to conditions at the factory, the expense burden on the producer of the waste and to the body of water into which the effluent is to be discharged. There are instances where cities have reimbursed certain manufacturers for treating their wastes separately, and others where the manufacturers have reimbursed the city for the additional treatment required.