Case studies: № 1.
In waterworks coagulation process water produced aluminum sulfate 10 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at 0.5 mg / l.
Water quality after coagulation are given in the table below
.
Index
Colour (grad)
colourless (мг/л)
рН
Ostatok Al мг/л
Оstatok PАА мг/л
Result of learning
Before coagulation
After coagulation
20
15
3,0
1,5
7,6
6,8
0,3
2,2
Assess the effectiveness of the coagulation process on the basis of laboratory
studies of water quality.
Case study. №2
In waterworks coagulation process water produced aluminum sulfate 30 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at a dose of 1.5 mg / l.
Water quality after coagulation are listed in the following table.
Assess the effectiveness of the coagulation process on the basis of laboratory
studies of water quality.
Case study. №2
In waterworks coagulation process water produced aluminum sulfate 30 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at a dose of 1.5 mg / l.
Water quality after coagulation are listed in the following table.
Assess the effectiveness of the coagulation process on the basis of laboratory
studies
of
water
quality.
Case
study.
№2
In waterworks coagulation process water produced aluminum sulfate 30 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at a dose of 1.5 mg / l.
Water quality after coagulation are listed in the following table.
Index
Colour (grad)
Colourless mg-l
рН
Result of learning
Before coagulation
After coagulation
50
20
5,0
7,6
1,5
6,8
Ostatok Al mg/l
-
0,1
-
0,5
Оstatok PАА mg/l
Assess the effectiveness of the coagulation process on the basis of laboratory
studies of water quality.
Case studies: № 3
In waterworks coagulation process water produced aluminum sulfate 40 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at a dose of 1.5 mg / l.
Water quality after coagulation are listed in the following table.
Index Показатели
Colour (grad)
Colourless
рН
Ostatok Al mg/l
Оstatok PАА mg/l
Result of learning
Before coagulation
After coagulation
40
15
3,0
7,6
-
1,5
6,8
0,5
-
1,2
Assess the effectiveness of the coagulation process on the basis of laboratory
studies of water quality.
Solution of the problem.
The results of coagulation of water is estimated according to GOST 950-2000
"Drinking water". Indicators of water color by Guest are not more than 20 degrees
and 15 degrees, the result is correct. Turbidity is normally 1.5 mg / l and after
coagulation and 1.5 mg / l compliance. Residual aluminum and residual PAA
before and after the missing coagulation coagulation results correspond to normal.
The efficiency of the coagulation process with a dose of 40 mg / L of coagulant and
1.5 mg / l PAA flocculant sufficient to improve drinking water quality organoleptic
properties.
Case study. №4
In waterworks coagulation process water produced aluminum sulfate 20 mg / L of
water, followed by flocculation with polyacrylamide (PAA) at 0.5 mg / l.
Water quality after coagulation are listed in the following table.
Index
Colour (grad)
Colourless
Result of learning
Before coagulation
After coagulation
50
35
5,0
2,5
рН
7,6
6,8
Ostatok Al mg/
0,7
Оstatok PАА mg/l
1,5
Assess the effectiveness of the coagulation process on the basis of laboratory
studies of water quality.
Solutions
The results of coagulation of water is estimated according to GOST 950-2000
"Drinking water". Indicators of water color by Guest are not more than 20 degrees,
35 degrees and the results do not meet safety standards. Turbidity is normally 1.5
mg / l and after coagulation of 2.5 mg / l is not correct. Residual aluminum in the
norm of 0.5 mg / l after coagulation and residual PAA 0.7 OK 2.0 mg / l after
coagulation correspond to normal. The effectiveness of the coagulation process in
doses of 20 mg / l of coagulant and 0.5 mg / L PAA flocculant is not enough to
improve the quality of drinking water meets the requirements of GOST "Drinking
Water" for organoleptic properties.
Case
studies:
№
5
In waterworks chlorination process performed by simple dose and have found that
if water-index -2-microbial numbers 40, residual chlorine, 0.3 mg / l. Assess the
effectiveness of chlorination process on the basis of laboratory studies of water
quality.
Solutions: Bacteriological examination of water and determination of residual
chlorine in the water line indicates the observed water-quality art 950-2000 Dove
"Ichimlik Suvi". The process of neutralization of the water at the waterworks is
carried out efficiently
.
Situational problems number 6
At Waterworks held daily bacteriological analysis of water every hour and
determine the residual chlorine. The results showed coli index 5, the microbial
numbers 107, residual chlorine of 0.1 mg / l. Evaluate the use of water.
Solutions: Bacteriological examination of water and determination of residual
chlorine in water indicates not according to the observed water-quality art 9502000 Dove "Ichimlik Suvi". The process of neutralization of the water at the
waterworks is carried out is not effective.
Case studies: № 7.
At the waterworks had chlorination process simple and at the same dose in water
found coli index -5, microbial number 137, residual chlorine, 0.5 mg / l. Assess the
effectiveness of chlorination process on the basis of laboratory studies of water
quality.
Case studies number 8
At Waterworks held daily bacteriological analysis of water every hour and
determine the residual chlorine. The results showed coli index-3 microbial count
197, residual chlorine of 0.5 mg / l. Evaluate the use of water.
Case studies: № 9
In waterworks chlorination process performed by simple dose and have found that
if water-index -6-microbial numbers 140, residual chlorine, 0.01 mg / l. Assess the
effectiveness of chlorination process on the basis of laboratory studies of water
quality.
Case studies number 10
At Waterworks held daily bacteriological analysis of water every hour and
determine the residual chlorine. The results showed coli index 5, the microbial
numbers 187, residual chlorine 0.02 mg / l. Evaluate the use of water.