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Impact on Water Quality
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5.2. Impact on Water Quality
Plant personnel provided discharge limits and average measured values from each of the two effluent sources summarized in the table below.
Table 5.2.1. Effluent Characteristics from Mozyr Refinery
|
Parameter |
Maximum Permissible Concentration (mg/l)* |
Actual Concentration: Discharge 1 (mg/l) |
Actual Concentration: Discharge 2 (mg/l) |
|
РН |
6.5-9.0/6.5-9.0 |
7.5 – 8.5 |
7.5 – 8.5 |
|
Suspended solids |
30 |
15.183 |
16.429 |
|
BOD5 |
8.5 |
3.58 |
3.329 |
|
COD |
70 |
34.868 |
35.803 |
|
Mineral composition |
640 |
450.45 |
448.686 |
|
Chlorides |
160 |
94.482 |
94.787 |
|
Sulphates |
180 |
62.037 |
54.664 |
|
Ammonia nitrogen |
5.0 |
1.743 |
2.074 |
|
Nitrite nitrogen |
1.0 |
0.087 |
0.109 |
|
Nitrate nitrogen |
16.0 |
10.622 |
8.626 |
|
Phosphates ( Р) |
2.6 |
1.243 |
1.38 |
|
Sulfides |
0.2 |
0.043 |
0.04 |
|
Phenols (volatile) |
0.1 |
0.019 |
0.018 |
|
Oil products |
Discharge 1: 0.3 Discharge 2: 1.0 |
0.157 |
0.163 |
|
Synthetic surface active substances |
0.5 |
0.193 |
0.159 |
|
Iron |
1.0 |
0.299 |
0.302 |
|
Copper |
0.05 |
0.009 |
0.007 |
|
Nickel |
0.05 |
0.011 |
0.01 |
|
Chromium (total) |
0.03 |
0.005 |
0.003 |
|
Zinc |
0.5 |
0.044 |
0.033 |
Note: * – from permit for special water use
Although the data reported above shows the discharges from the facility are compliance from the perspective of average concentrations, Facility Personnel are concerned with the concentrations of nitrogen compounds, suspended solids, BOD and oil products.
The impact of the discharge points on the river is summarized in the table below. The concentrations shown were taken from eight samples at each sampling point.
Table 5.2.2. Results of analysis of water of the Pripiat River for March 2002
|
Parameter |
Upstream the discharge No.1 |
Downstream the discharge No.1 |
Difference |
Upstream the discharge No.2 |
Downstream the discharge No.2 |
Difference |
|
РН |
8 |
8.1 |
1.24% |
8 |
8.1 |
1.24% |
|
COD |
35.25 |
32.04 |
-9.54% |
33.45 |
33.64 |
0.57% |
|
BOD5 |
2.36 |
2.34 |
-0.85% |
2.43 |
1.31 |
-59.89% |
|
Phenols |
0.002 |
0.002 |
0.00% |
0.002 |
0.002 |
0.00% |
|
Sulfides |
0.018 |
0.015 |
-18.18% |
0.018 |
0.015 |
-18.18% |
|
Sulphates |
22.9 |
22.9 |
0.00% |
22.9 |
22.9 |
0.00% |
|
Phosphorus of Phosphates |
0.01 |
0.01 |
0.00% |
0.01 |
0.01 |
0.00% |
|
Ammonia nitrogen |
0.61 |
0.77 |
23.19% |
0.63 |
0.8 |
23.78% |
|
Chlorides |
17.65 |
19.42 |
9.55% |
17.6 |
19.4 |
9.73% |
|
Nitrate nitrogen |
1.2 |
1.5 |
22.22% |
1.3 |
1.6 |
20.69% |
|
Nitrite nitrogen |
0.006 |
0.006 |
0.00% |
0.006 |
0.006 |
0.00% |
|
Dissolved oxygen |
10.88 |
10.62 |
-2.42% |
11.09 |
11.63 |
4.75% |
|
Suspended solids |
13.8 |
14.2 |
2.86% |
14.4 |
15 |
4.08% |
|
Petroleum products |
0.04 |
0.06 |
40.00% |
0.05 |
0.07 |
33.33% |
|
Surfactants |
0.03 |
0.04 |
28.57% |
0.03 |
0.04 |
28.57% |
|
Copper |
0.004 |
0.005 |
22.22% |
0.004 |
0.004 |
0.00% |
|
Chromium |
0.001 |
0.002 |
66.67% |
0.001 |
0.001 |
0.00% |
|
Nickel |
0.002 |
0.002 |
0.00% |
0.001 |
0.002 |
66.67% |
|
Iron |
0.595 |
0.602 |
1.17% |
0.62 |
0.623 |
0.48% |
|
Zinc |
0.005 |
0.006 |
18.18% |
0.003 |
0.003 |
0.00% |
Those parameters of particular concern, nitrogen compounds, petroleum products and surfactants, are highlighted and should a marked increase (greater than 20%) from upstream and downstream samples.
