| A | B |
|---|
| water conservation | using water carefully and protecting it |
| microorganisms | bacteria in the soil that helps digest the remaining solid particles in the wastewater |
| irrigation | piping in water from lakes, ponds, rivers to water farms |
| wastewater | water that runs into drains that may contain sewage and chemicals from homes and businesses or pollutants from industry |
| hydrologic cycle | another name for the water cycle |
| wastewater treatment plant | pipes and sewers that carry billions of gallons of wastewater from homes, businesses, and other public buildings |
| grit chamber | grit that settles out on the bottom of the wastewater |
| primary treatment | step 1, removing solid materials using screens and sedimentation |
| primary sedimentation tank | the tank that receives the waste water from the grit chamber |
| secondary treatment | step 2, the process that uses biological methods |
| aeration | putting air into a substance |
| secondary sedimentation tank | the tank where the wastewater goes after the aeration part |
| tertiary treatment | step 3, the step that uses sand to filter the remaining solid particles |
| sludge | the removed solid particles during the various stages of the cleaning process |
| cake | a dry material that contains many nutrients and is used for fertilizer on farms |
| septic system | includes a septic tank and absorption field |
| septic tank | a water-tight box where wastewater flows |
| absorption field | the remaining water in the tank flows to the buried pipes |
| perforated pipes | pipes with holes or perforation that leaks the filtered wastewater into the absorption field |
| stewardship | having a responsibility for conserving and restoring resources |
