IMPROVING THE EFFICIENCY OF WASTEWATER TREATMENT CONTAINING PETROLEUM PRODUCTS
Table 1 - Comparison of the concentration of pollutants in the filtrate with permissible values
Indicator | The standard MPC | Spent WWPP | Ultrafiltration (fluoroplast) | Ozonation and ultrafiltration (fluoroplast) | ||
Permeate pollutant concentration value | Degree clearances | Permeate pollutant concentration value | Degree clearances | |||
C±Δ mg/dm3 P=0.95, n=2 | C±Δ mg/dm3 P=0.95, n=2 | % | C±Δ mg/dm3 P=0.95, n=2 | % | ||
6.0-9.0 | 8.9±0.1 | 8.9±0.1 | - | 7.8±0.1 | - | |
Suspended solids, mg/dm3 | 300 | 1554±233 | < 0.5 | 99.9 | < 0.5 | 99.9 |
Dry residue, mg/dm3 | 3000 | 19900±3980 | 4700±470 | 23.2 | 850±85 | 81.4 |
*BOD5, mg/dm3 | 300 | 6305±1261 | 315±63 | 80.2 | 8.8±1.8 | 97.0 |
COD, mg/dm 3 | 500 | 18215±3643 | 1052±210 | 76.2 | 23.4±4.7 | 97.6 |
Nitrate ion, mg/dm3 | - | 54.6±11 | 47±7 | 13.9 | 3.15±0.63 | 92.1 |
Nitrite ion, mg/dm3 | - | 2.91±0.58 | 2.1±0.42 | 27.8 | <0.02 | 98.9 |
Sulfate ion, mg/dm3 | 300 | 121±24 | 108±16 | 10.7 | 9.21±1.84 | 90.9 |
Phosphate ion, mg/dm3 | 12 | 54.6±11 | 20±4 | 17.7 | 1.84±0.37 | 90.4 |
Chloride ion, mg/dm3 | 1000 | 280±56 | 277±27.7 | 1.1 | 30.8±6.2 | 88.8 |
Petroleum products, mg/dm3 | 10 | 14400±2880 | 109±10.9 | 93.2 | <0.05 | 99.9 |
Anionic surfactants, mg/dm3 | 10 | 3.15±0.79 | 2.6±0.5 | 10.3 | <0.02 | 99.3 |
Non-ionic surfactant, mg/dm3 | - | 4711±942 | 2974±446 | 31.2 | 1.12±0.22 | 99.9 |
Fat content, mg/dm3 | 50 | 10100±2525 | 149±29.8 | 94.9 | <0.01 | 99.9 |
* BOD5 - Biochemical oxygen demand during 5 days of incubation at 20 °C