Dump sewage into oceans and rivers is a serious form of pollution. A: Having dumped sewage B: Being dumped sewage C: Dumped sewage D: Dumping sewage

Which of the following operation is correct?______. A: After being treated in the bio-filter tank, the sewage is discharged overboard B: After going through the biological film, the sewage is discharged overboard C: The sewage treated in the bio-filter tank flows into the sterilization compartment D: The sewage is first collected in sterilization tank then discharged into the bio-filter tank.

In a sense, tourism speeds up unhealthy urbanization processes and results in traffic congestion, noise and air pollution and the dumping of waste and untreated sewage.

What has NOT been controlled at all as regards water pollution A: Industrial polluters. B: Sewage. C: Rain runoff. D: Toxic substances.

Biological sewage treatment plant work on the ______.: aeration process|centrifuging process|heating process|settling process

affects people immediate environments and leads to water related illnesses.(Sewage disposal / Processing waste gases)

_____ is NOT pollution prevention equipment. A: Oily water separator B: Sewage treatment plant C: Fuel oil separator D: Incinerator

Please find the word that is equivalent to the definition.fit for drinking（） A: sewage B: vegetation C: potable D: drainage E: waterlogged F: sedimentG．habitatH．erosion

To improve the （）is regarded as a good method to increase the farmer's income in the south part of the country. A: sewage B: drainage C: aqueduct D: archway

Please find the word that is equivalent to the definition.fit for drinking A: sewage B: vegetation C: potable D: drainage E: waterlogged F: sediment G: habitat H: erosion