6Screening in sewage treatment removes:ABacteriaBDissolved saltsCLarge floating materialsDOdourView AnswerDiscussWorkspaceReportSaveEasy
7An oxidation pond treats sewage using:ABacteria and algae in a symbiotic relationshipBChemicals onlyCUltraviolet lampsDFiltersView AnswerDiscussWorkspaceReportSaveEasy
8Self-purification of streams involves:AFreezingBEvaporation onlyCDilution, sedimentation, oxidation and aerationDAdding chlorine onlyView AnswerDiscussWorkspaceReportSaveEasy
9A manhole is provided in sewers for:AInspection and cleaningBAeration of soilCWater supplyDRain collection onlyView AnswerDiscussWorkspaceReportSaveEasy
10A soak pit is used with a septic tank to:ATreat drinking waterBStore sludgeCLet the effluent percolate into the groundDCollect rainwaterView AnswerDiscussWorkspaceReportSaveEasy