Case study: № 1.
When the sanitary survey treatment plant aeration "Salar" established that
the waste water of the city of Tashkent in the amount of 50,000 cubic meters
day passes cleaning on these plants: grille, sand traps, circular tanks, aeration
tanks, secondary circular tanks. Wastewater disinfection with chlorine is
carried out. The contact time is 30 minutes, if the index after chlorination of
wastewater of 600 - 1000, the residual chlorine of 1.5 - 1.8 mg / l.
Rate purification scheme, the conditions and the effectiveness of chlorination.
Solutions.
The purification scheme for sewage aeration "Salar" correctly. Terms and
effectiveness of chlorination meets the hygienic requirements as for 0056-96
SanPin contact time must be at least 30 minutes, if the index is not more than
1000 chlorine residual of at least 1.5 mg / l
Case study: № 2.
When the sanitary survey treatment plant aeration "Salar" established
that the waste water of the city of Tashkent in the amount of 100,000 cubic
meters day passes cleaning on these plants: sand traps, circular tanks,
aeration tanks. Wastewater disinfection with chlorine is carried out. The
contact time is 30 minutes, if the index after chlorination effluent 600 - 900,
residual chlorine of 1.5 - 1.6 mg / l.
Rate purification scheme, the conditions and the effectiveness of
chlorination.
Solutions.
The purification scheme for sewage aeration "Salar" wrong, because
according to KMK "Sewerage. Internal and external networks "should be
grille and secondary sedimentation tanks. Terms and effectiveness of
chlorination meet hygienic requirements, as for 0056-96 SanPin contact time
must be at least 30 minutes, if the index is not more than 1000 chlorine
residual of at least 1.5 mg / l
n the sanitary survey treatment plant aeration "Salar" established that
the waste water of the city of Tashkent in the amount of 1000 cubic meters
day passes cleaning on these plants: sand trap grille, circular tanks, aeration
tanks secondary sedimentation tanks. Wastewater disinfection with chlorine is
carried out. The contact time is 25 minutes, if the index wastewater after
chlorination 1600 - 1900, residual chlorine of 1.2 - 1.4 mg / l.
Rate purification scheme, the conditions and the effectiveness of
chlorination.
Solutions.
The purification scheme for sewage aeration "Salar" wrong, because
according to KMK "Sewerage. Internal and external networks' money had to
be aeration tanks and secondary sedimentation tanks. Terms and effectiveness
of chlorination does not meet hygienic requirements, as for 0056-96 SanPin
contact time must be at least 30 minutes, if the index is not more than 1000
chlorine residual of at least 1.5 mg / l
Case study number 4
Assess the effectiveness of wastewater treatment aeration station "Salar"
according to the given protocol №33.Spusk wastewater is carried out in the
Salar River within the city limits.
Protocol №33.
Studies wastewater purification steps.
Location of sampling -ochistnye facilities.
Time-sampling 25.12.2008g.
indicators analysis
125.0
waste water
After
after
circular
aeration
tanks
110.0
12.0
11.0
37.0
99.0
99.0
Relative stabilonost%
55.0
55.0
50.0
50.0
Chlorides, mg / l
18.2
18.0
10.2
9.8
Ammon nitrogen, mg / l
0.0
0.0
0.1
0.14
Nitrite Nitrogen, mg / l
0.0
0.0
9.6
9.0
nitrate nitrogen
-------
--------
--------
1.5
incoming
BOD, mg.02 / l
after
chlorination
10.0
Solutions
In assessing the biological treatment should first clarify the analysis of
waste water availability indicators reflecting 1 (BOD stability) and 2
(ammonia nitrogen, nitrate nitrogen) phase oxidation of organic substances.
To assess the technical efficiency of biological treatment is necessary to
focus on the performance analysis of wastewater BOD aqueous stability of the
compounds of group nitrogen (ammonia nitrogen, nitrite nitrogen, nitrate
nitrogen). Method of determining the technical efficiency izlazhena above.
Results: The technical efficiency for BOD. Is 96%, which corresponds to the
KVM trebuvaniyam Sewerage.
From the analysis it follows that the process of oxidation of organic
substances is evidenced:
1, reducing the concentration of ammonia nitrogen from 18 to 10.2 mg / l
2-appearance of nitrite and nitrate nitrogen (0.1 and 9.6 mg / l)
Assessing the relative stability of the wastewater should be aware that the
biological ochistkaaa effective in terms of relative stability is not meene .Poskolku
80% in the above analysis of the stability of wastewater after treatment is 99% it
can be otsenina positive.
Case study number 5
Assess the effectiveness of wastewater treatment aeration station "Salar"
according to the given protocol №205.Spusk wastewater is carried out in the
Salar River within the city limits.
Protocol №205.
Studies wastewater purification steps.
Location of sampling -ochistnye facilities.
Time-sampling 20.10.2008g.
indicators analysis
Temperatura.S
22.5
waste water
After
after
circular
aeration
tanks
22
19.5
transparency.sm
2.0
9.0
12.0
19.0
Precipitate volume
2.1
1.1
0.9
0.2
suspended solid matter in mg / l
110.0
55.0
92.0
16.0
Total mikrob.chislo
380000
92000
38000
3000
if the index
2380000
238000
238000
800
Incomin
g
After
chlorination
20
Residual chlorine mg / l
--------
-------
-------
1.5
solutions
To evaluate the effectiveness of the mechanical cleaning technology primarily
from analysis should identify indicators wastewater precipitate volume
defined in further transparency (%) reduction in the concentration of
suspended solids (x1) precipitate (x2) after the mechanical treatment
compared to the incoming. Taking as 100% the amount of suspended solids or
sludge volume in the incoming waste water find% suspended solids remaining
in mg l and sludge volume.
55 х 100
1
х 1 х 100
Х 1 = ----------------------= 50 %
Х2 = --------------------------- = 50 %
110
2, 2
It follows that the technical efficiency of mechanical treatment is 50%.
The analysis shows that, along with a decrease in the weighted substances
increases the transparency of wastewater can vary from 2 to 9 cm.
Assessing technical efficiency mechanical treatment should focus on the KVM
Sewerage which provides for effectiveness delay the weighted substances in
lagoons at 45-50%.
To evaluate the effectiveness of disinfection should be in addition to determining
if% reduction index rely on surface water from sewage pollution SanPin 0056-96
.Otsutstvie anija contain pathogens in the water is achieved by disinfection of
biologically treated wastewater to the index if not more 1000pri residual chlorine
less than 1.5 mg / l.
Thus, treatment of wastewater as on stages and in general shows a high
technical efficiency.
Case studies: № 1.
Assess the effectiveness of wastewater treatment aeration station "Salar" according
to the given protocol №22.Spusk wastewater is carried out in the Salar River
within the city limits.
Protocol №22.
Studies wastewater purification steps.
Location of sampling -ochistnye facilities.
Time sampling-12.11.2008.
indicators analysis
waste water
Incomin
g
Temperatura.S
23.5
After
circular
tanks
21
after
aeration
After
chlorination
19.0
21
transparency.sm
2.5
8.0
14.0
18.0
Precipitate volume
2.2
1.5
0.8
0.3
suspended solid matter in mg / l
115.0
75.0
95.0
15.0
Total mikrob.chislo
370000
95000
37000
3100
if the index
2350000
235000
235000
810
Residual chlorine mg / l
--------
-------
-------
1.4
Situational problem number 2.
Assess the effectiveness of wastewater treatment aeration station "Salar"
according to the given protocol №20.Spusk wastewater is carried out in the
Salar River within the city limits.
Protocol №20.
Studies wastewater purification steps.
Location of sampling -ochistnye facilities.
Time-sampling 25.11.2008g.
indicators analysis
Temperatura.S
22.0
Waswte water
After
after
circular
aeration
tanks
21
19.7
transparency.sm
2.3
9.7
13.0
19.5
Precipitate volume
2.5
1.7
0.8
0.2
suspended solid matter in mg / l
115.0
58.0
97.0
18.0
Total mikrob.chislo
3805000
925000
385000
3500
if the index
23850000
2385000
2385000
850
Residual chlorine mg / l
--------
-------
-------
1.1
Incoming
Situational tasks number 3.
After
chlorination
20.1
Assess the effectiveness of wastewater treatment aeration station "Salar"
according to the given protocol №15.Spusk wastewater is carried out in the
Salar River within the city limits.
Protocol №15.
Studies wastewater purification steps.
Location of sampling -ochistnye facilities.
Время взятие пробы22.10.2008г.
indicators analysis
Temperatura.S
Waste water
incoming After
after
circular
aeration
tanks
22.5
22
19.5
transparency.sm
2.0
9.0
12.0
19.0
BOD
125.0
110.0
12.0
10.2
relative stability
11.0
35.0
95.0
99.0
chlorides
55.0
55.0
50.0
50.0
if the index
2380000
238000
238000
800
Residual chlorine mg / l
--------
-------
-------
1.3
After
chlorination
20
Situational problem number 4.
When san. Survey treatment plant orders. doctors established that the fault
of the chief engineer of the sewage treatment plant control treatment plant is
carried out once a week. These laboratory analysis showed that the effluent
quality to allow epidemiological indicators consider water sbrasyvaemy open
water epidemiological safety. Earlier workers with storany treatment plant
violations were noted. Give your decision.
Situational problem number 5.
When san. Survey treatment plant orders. doctors established that the fault
of the chief engineer of the WWTP control of chlorination of water is carried
out once a day. These laboratory analysis showed that the effluent quality to
allow epidemiological indicators consider water sbrasyvaemy open water
epidemiological safety. Earlier workers with storany treatment plant
violations were noted. Give your decision.