Table 1
Raw coke wastewater [Miodoński et al. 2010].
| Parameter | Concentration mg/dm3 |
|---|---|
| Ammonium nitrogen | 600 |
| Total nitrogen | 900 |
| Chemical oxygen demand | 4500 |
| Phenols | 2000 |
| Thiocyanates | 30 |
| Free cyanides | 5 |
| Hydrogen sulphide | 50 |
Table 2
Quality parameters of the wastewater discharged.
| Type of substance | Dz.U. 2006 nr 136 poz. 964 mg/dm3 mgO2/dm3 | Dz.U. 2014 poz. 1800 mg/dm3 mgO2/dm3 | Requirements of BAT 56∗∗ mg/dm3 |
|---|---|---|---|
| Ammonium nitrogen | 100–200 | 10 | - |
| Nitrite nitrogen | 10 | 1 | - |
| Total nitrogen | - | 30 | <15–50 |
| Chlorides | 1000 | 1000 | - |
| COD | * | 250∗ | <220∗ |
| BOD5 | * | 25∗ | <20∗ |
| Free cyanides | 0.5 | 0.1 | <0.1 |
| Combined cyanides | 5 | 5 | - |
| Thiocyanides | - | - | <4.0 |
| Free sulphides | - | 0.2 | <0.1 |
| Thiocyanates | 30 | 10 | - |
| Volatile phenols | 15 | 0.1 | <0.5 |
| PAHs | 15 | 15 | <0.05 |
∗∗ Decyzja …2012.
∗ The values of the indicators shall be determined on the basis of the permissible load of the treatment plant.
∗ The values of the indicators shall be determined on the basis of the permissible load of the treatment plant.
Figure 1
Diagram of the process treatment of coke wastewater.
Figure 2
Diagram of me multi-marge treatment of coke wastewater.
Figure 3
Biological treatment scheme for process waters.