The production of pulp and paper generally consists of processes such as pulping, washing, bleaching, and papermaking. The papermaking industry pulp includes alkaline pulp, chemical mechanical pulp, and mechanical pulp. The occurrence and discharge of pollutants in its wastewater vary greatly depending on the different pulping methods, raw materials, pulp yield, papermaking varieties, and the presence or absence of chemical recovery. However, they generally contain a large amount of suspended solids, BOD, COD, and some toxic substances, and are usually treated using a combination of physicochemical and biological methods. The main odor components are organic gases such as methanol, formic acid, acetic acid, unsaturated fatty acids, etc.
Odor components | Odor inlet indicators | Odor discharge indicators | Exhaust pipe height |
H2S | ≤100mg/m3 | ≤0.6kg/h | 15m |
NH3 | ≤40mg/m3 | ≤0.6kg/h | |
C2H6S | ≤50mg/m3 | ≤0.6kg/h | |
Odour | ≤3000 | ≤800 |