Question
Download Solution PDFThe tolerance limit of hardness in water as per IS drinking water standard is specified as
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
As per IS 10500: 1991, what is the permissible limit in the absence of alternative sources for the total hardness of drinking water is 600 mg/l.
The permissible limits of various compounds are as follows:
|
Parameters |
Acceptable Limit |
Cause for rejection (Permissible) |
|
Total suspended solids |
500 |
2000 |
|
Turbidity (NTU) |
1 |
10 |
|
Colour (TCU) |
5 |
25 |
|
Taste & odour (TON) |
1 |
3 |
|
Total dissolved solid (mg) |
500 |
2000 |
|
Alkalinity |
200 |
600 |
|
pH |
6.5 - 8.5 |
No relaxation |
|
Hardness (mg/L) |
200 |
600 |
|
Chloride content (mg/L) |
250 |
1000 |
|
Free ammonia (mg/L) |
0.15 |
0.15 |
|
Organic ammonia (mg/L) |
0.3 |
0.3 |
|
Nitrite (mg/L) |
0 |
0 |
|
Nitrate (mg/L) |
45 |
45 |
|
Fluoride content (mg/L) Iron as Fe (mg/L) |
1 0.1 |
1.5 1.0 |
|
Sulphate (mg/L) |
200 |
400 |
|
Calcium (mg/L) |
75 |
200 |
Last updated on Jun 24, 2025
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