Results of industrial research of units AVS-100 represented in table 2.
Table 2
The sterilization results of chromium-containing wastewater by AVS-100
|
Basic concentration value Cr6+, mg/dm3 |
pH process |
Consumption of iron sulfate, |
Ferromagnetic element mass, g |
Residual Cr6+ content after purification, mg/dm3 |
|
100 |
2 |
100 |
150 |
0 |
|
90 |
0 |
|||
|
80 |
0,56 |
|||
|
100 |
4 |
90 |
150 |
0 |
|
80 |
0,9 |
|||
|
590 |
2 |
100 |
200 |
0 |
|
90 |
0 |
|||
|
80 |
0,8 |
|||
|
1000 |
2,5 |
100 |
200 |
0 |
|
90 |
0,11 |
|||
|
80 |
1,1 |
|||
|
200 |
7,5 |
100 |
150 |
0,012 |
|
200 |
9,0 |
100 |
150 |
0 |
|
90 |
0,05 |
|||
|
80 |
0,98 |
|||
|
750 |
7,5-8,5 |
90 |
200 |
0,1-0,01 |
Neutralization of acid-base, sterilized, chromium-containing wastewaters and metal hydroxide formation was testing at the same installation by using AVS-100. As reagent was used 5-10% lime milk solution. Value of pH process was changing in the range of 7,5-9,0. Results of testing represented in table 3.
Table 3
Results of neutralization and treatment of wastewater from heavy metals ions by using industrial installation and AVS-100.
|
Basic metal concentration, mg/dm3 |
pH process |
Consumption of Ca(OH)2, |
Ferromagnetic element mass, g |
Residual metal content, mg/dm3 |
| Fe2+;3+= 130,0 |
7,5 |
90,0 |
200, |
Fe2+;3+ – 0 |
| Cu2+= 50,0 | Cu2+ – 0,12 | |||
| Zn2+= 45,0 | Zn2+ – 0,063 | |||
| Cd2+= 10,0 | Cd2+ – 0,07 | |||
| Cr3+= 120,0 | Cr3+ – 0 | |||
| Fe2+;3+= 170,0 |
8,5 |
100,0 |
150 |
Fe2+;3+ – 0 |
| Cu2+= 40,0 | Cu2+ – 0,018 | |||
| Zn2+= 28,0 | Zn2+ – 0 | |||
| Cd2+= 5,5 | Cd2+ – 0,011 | |||
| Cr3+= 100,0 | Cr3+ – 0 | |||
| Fe2+;3+= 250,0 |
8,7 |
100,0 |
200 |
Fe2+;3+ – 0 |
| Cu2+= 65,0 | Cu2+ – trace | |||
| Zn2+= 35,0 | Zn2+ – trace | |||
| Cd2+= 2505 | Cd2+ – 0 | |||
| Cr3+= 350,0 | Cr3+ – 0 |
At the same time we investigated method of industrial treatment using the mechanical mixing by flowmaker and also by using barbotage of air. By industrial technology consumption of lime milk is on a level 115-120% from stoichiometric consumption. Mixing time of wastewater with reagent is 15-20 min.
The following figures show comparative dependence effectiveness of wastewater treatment from heavy metals and also clarification of wastewater in the settling tank by using AVS-100 and reactors with the mixing machine.
Installation AVS-100 permit to provide the treatment quality below the maximum permissible concentration, reduce the consumption of reagent in 1,5 – 2 times and consumption of energy in 2 times, reduce the working area in 10-15%, it gives high economic benefits.We investigated the process of reclamation of chromium by regular reagent method using the barbotage by air with processing time 15-20 minutes to compare effectiveness of wastewater treatment from chromium in industrial conditions.
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