| No. | Waste Code | Description | 
|---|---|---|
| 21 | SW304 | Press cake from pretreatment of glycerol soap lye | 
| 22 | SW305 | Spent lubricating oil | 
| 23 | SW306 | Spent hydraulic oil | 
| 24 | SW307 | Spent mineral oil/water emulsion | 
| 25 | SW308 | Oil tanker sludge | 
| 26 | SW309 | Oil water mixture such as ballast water | 
| 27 | SW310 | Sludge from mineral oil storage tank | 
| 28 | SW311 | Waste oil or oily sludge | 
| 29 | SW312 | Oil residue from automotive WS, O&G @ interceptor | 
| 30 | SW313 | Oil cont. earth from refining of used lubricating oil |