| WWTP | Wastewater treatment plant |
| HM | Heavy metal |
| AS | Activated sludge |
| SS | Suspended solid |
| TP | Total phosphorus |
| NH3-N | Nitrate nitrogen |
| TN | Total nitrogen |
| COD | Chemical oxygen demand |
| BOD5 | Biochemical oxygen demand |
| MBR | Membrane bioreactor |
| SRT | Sludge retention time |
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