The reasons lie in the design and operation of wastewater treatment equipment. The difficulty is the comprehensive removal of the entire spectrum of pollutants used in industrial processes.
Furthermore, it is very important to strictly follow the environmental rules and requirements of wastewater discharge into waterways. These rules demand multi-stage treatment technologies and development of new and improvement of the already existing methods of treating wastewater from galvanic production.
At the moment, process equipment does not fully utilize the chemicals used for cleaning and neutralizing the heavy metal ions in wastewater, such as acids, alkaline and rinse water.
In addition, the increase in volume of sludge and sediment significantly complicates operation of wastewater treatment plants and leads to increase in energy costs.
Therefore, finding ways to improve the efficiency of wastewater treatment is always relevant. One of the ways to solve this problem is offered by GlobeCore with its electromagnetic nano-mill (AVS). This equipment was developed in the 1960-1970s and is successfully used in many production lines for intensification of processes.
The effects of electromagnetic treatment, dispersion phase, electrolysis and high local pressure in the chamber of the AVS significantly accelerate the process of wastewater treatment.
Research Department of GlobeCore performed experiments treating wastewater from galvanic production with the AVS-100 laboratory electromagnetic nano-mill. The results of the experiment are shown in Table 1.
Table 1
The results of treatment of wastewater from galvanizing removing heavy metals with electromagnetic nano-mill AVS 100
| № |
Parameter |
Value |
Maximum permissible concentration (European Union) |
|
|
Before treatment |
After treatment |
|||
| 1 |
рН |
1,75 |
6,74 |
6,5-8,5 |
| 2 |
Fe, mg/l |
9,7 |
2,77 |
2-20 |
| 3 |
Cu, mg/l |
18,29 |
0,65 |
0,1-4 |
| 4 |
Ni, mg/l |
5,8 |
<0,02 (not detected) |
0,5-3 |
| 5 |
Cr+6, mg/l |
19,08 |
<0,005 (not detected) |
0,1-0,5 |
The submitted data shows that the AVS reduces the concentration of heavy metals to values not exceeding the maximum permissible concentration for the European Union. The nickel and hexavalent chromium are completely absent in the treated water. It shows the possibilities of the future use of electromagnetic nano-mills in countries with more stringent regulations for hexavalent chromium and nickel concentrations.
Also worth noting is that the cleaning of wastewater samples was instant and the reagents were used in small amounts. In addition, there was a more intensive sedimentation of sludge compared to the units with conventional stirrers.