Presentation of practical lessons on
environmental sanitation for 4th
year 7 - term
1- Theme
Hygienic evaluation of the quality of drinking
water. Methods of selecting water sources for
drinking water supply. hygiene requirements
State Standard 951 - 2000.
Purpose of the lesson
• - Learn the basic legal documents regulating the
activities of physicians in the communal hygiene
in the implementation of CSS for the water
supply.
• - To teach students to use in the implementation
of legislative instruments for water CSS
• - To teach students to competently carry out
sanitary-hygienic assessment of the quality of
drinking water.
continue
• - Understand the purpose
of water supply source. - To
master the technique of
choice water source. - Learn
to evaluate sources of water
supply - Justify the need for
knowledge of basic legal
documents in preparation
of a qualified physician Promote the development
of students' thinking in the
study of topics
Student should know:
• Values and legal rules governing
the relationship of man to man,
society and the environment.
Know the criteria for assessing the
quality of drinking water. Features
of the organization and conduct of
sanitary and epidemiological
measures to mitigate the adverse
effects of the risk factors of public
health and the environment.
The student should be able to:
Values and legal rules governing the relationship of man to man, society
and the environment.
Know the criteria of ecological and hygienic assessment of
environmental objects.
Conduct sanitary inspection of supervision and make
the appropriate accounting and reporting
documentation.
s the source of centralized drinking water supply.
Perform visual, laboratory instrumentation, computational
methods for determining the hygienic assessment of
environmental factors.
Features of the organization and conduct of sanitary and
epidemiological measures to mitigate the adverse effects
of the risk factors of public health and the environment
Perform visual, laboratory instrumentation, computational methods for
determining the hygienic assessment of environmental factors.
Educational aim questions:
If the result of parasitological and radiological examinations will be negatively water can be
used for drinking water supply of the population. methods of laboratory analysis of water
Group of indicators defining water quality
Organoleptic characteristics of drinking water
Organoleptic characteristics normalized by the intensity of perception
Organoleptic characteristics depend on the availability of water chemicals
Quality of water from the tap selected headroom well be compared with the standards set out
in the SST 950-2000.
continue
Water quality
organoleptic
properties relevant
regulations.
Water quality
meets the
requirements of
toxicological
indicators.
Water quality
given
microbiological
indicators (TBC
and if the index)
comply with the
requirements of
SST 950-2000.
Must be
supplemented by the
results of analyzes of
water parasitological
studies in
accordance with SST
950-2000. Must be
supplemented by the
results of water
analyzes of
radiological
examinations in
accordance with
SST.
So what water
can be considered
СОДЕРЖАНИЕ
ЗАНЯТИЕ
"good"?
Potable water, in principle, if it
satisfies the following requirements: • If it does not
contain substances, including natural origin, in
such quantities that may be harmful to health; • If
it does not contain too many pathogens, ie, if it is
safe in epidemiological terms; • if it is transparent
and has no unpleasant taste or aftertaste.
Epidemiological indicators safety of drinking water:
The degree of bacterial
contamination of water
is determined by the
total number of bacteria
in 1 cm3 of water and
the largest coli-index,
which reflects the
number of indicator
coliform bacteria in 1
liter of water.
Koli-titer - the volume of
water which contains one
E. coli, should be at least
300. In accordance with
SanRandN 2.1.4.1074-01
total number of bacteria in
1 cm3 of undiluted water
must be no more than 100,
and if index - no more 3.
Organoleptic indicators pitevoy water
Chromaticity. Water in the normal state is
a colorless liquid; color, namely, a bluish
tint, it typically acquires only provided that
the thickness is not less than 2m Chemical
indicators of drinking water without harm
* Aluminium - 0,2mg / l * Beryllium 0.0002 mg / L Sodium- * 45 mg / l Fluoro
* 0.7 mg / l
continue
• Chemicals affecting the organoleptic properties of
water:
• Iron General stiffness Mn Sulfates, chlorides
Indicators definable attraction sokrashennom
water analysis:?
• * Total microbial count? If index
• * The smell, the taste Color Turbidity
Selecting a water source one of the critical and
often occur in health
activities tasks. It is
manufactured in
accordance with the
requirements of GOST
951 - 2000 "Selecting
sources of centralized
drinking water supply."
General plan for water supply
To groundwater include:
1. ground water, which are
characterized by the presence of the
bed and the lack of waterproof roof;
2. interstratal water, which are
water-resistant roof.
To select the source of water
supply in the first place need to
figure out all of the local water
resources and to determine
whether one or more water
sources to satisfy the amount of
water consumption rates
populated areas as a whole, and to
consider the prospects for
population growth and the
development of improvement.
In artesian aquifer has nutritional pressure
and discharge of groundwater is formed from
a combination of many processes, which are
divided into 2 groups:
1. Chemically-solute
sorption exchange
sedimentation, chemical
phenomenon. .
2. The mechanical,
physical and chemical
mobility are caused by
groundwater, absorption
and release of gases and
others.
Depending on the nature of landforms
distinguish
Lowland rivers
mountain rivers.
Suitability source for drinking water supply of the
population is based on:
Composition of fresh water underground and
surface water sources must meet the following
requirements:
Solids not more than 1000 mg / l; in agreement
with the sanitary epidemiological surveillance
allowed up to 1500 m / l
The chloride content of not more than 250 mg / l;
in agreement with the sanitary epidemiological
surveillance allowed up to 350 m / l;
Sulfate content is not more than 400 mg / l; in
agreement with the sanitary epidemiological
surveillance allowed up to 500 m / l;
Total hardness less than 7 mg-eq / l; in agreement
with the sanitary epidemiological surveillance
allowed up to 10 mg-eq / l;
Water quality of underground water sources by class
The name of
indicators
Water quality by class
1
2
3
Turbidity mg / l
maximum
1,5
1,5
10,0
Chromaticity, degrees
not more
20
20
30
Hydrogen index (pH)
6-9
6-9
6-9
Iron (ғe), mg / l, no
more
0,3
5.0
10,0
Manganese mg / l
maximum
0,1
1,0
2,0
-
-
3.0
Fluorine mg / l, more
0,7
0,7
5,0
Permanganate
oxidizability,
2,0
5.0
10,0
number index
3
100
1000
Hydrogen sulphide mg
/ l, more
Water quality of surface water sources by class
The name of indicators
Water quality by class
1
2
3
Turbidity mg / l, no more
20
1500
10000
Chromaticity, degrees not more
30
50
100
6,5-8,5
6,5-8,5
6,5-8,5
Iron (Fe), mg / l, no more
0,3
1.0
3,0
manganese
0,1
1,0
2,0
2
3
4
fluorine
0,7
0,7
0,7
permanganate oxidizability
7,0
15.0
20,0
BOD in mg O2 / l, not more
3,0
5,0
7,0
1000
10000
50000
Hydrogen index (pH)
The odor scores less than
BOD in mg O2 / l, not more The
number of Escherichia coli lactose in
1 liter (PBL), not more than
Underground water sources
Class 1 water quality on all parameters
meet the requirements O'z Dst
«Drinking water hygiene requirements
and quality control"
Grade 2 - water quality is the deviation of
individual indicators of the above standard,
which can be removed by aeration, filtration,
disinfection, or sources with unstable water
quality, which is reflected in the seasonal
variation of dry residue in the range allowed
for drinking water, and requires disinfection .
3 class. Raising the quality of the water
requirements of the above standard techniques
require additional processing provided in 2klasse
and methods such as filtration with a delay to the
preliminary use of various reagents and others.
Surface water sources
Surface water sources
Class 1 - to produce water that meets the
requirements O'z Dst «Drinking water
hygiene requirements and quality control",
requires obezzararazhivanie, filtration,
coagulation with or without him.
2 .- class for water corresponding to the
above standard, requires coagulation,
sedimentation, filtration, disinfection; in
the presence of fitoplanktonamicrofiltration
3 class. Raising the quality of the water
requirements of the above standards on
drinking water possible using processing
techniques specified in the 2nd class, with
additional metodov- additional clarification
stage, oxidation and sorption methods, and
more effective methods of disinfection and
others.
Sources of centralized drinking water supply in
accordance with their health safety taken in the
following order:
Interstratal pressure water;
Interstratal non-pressure water;
Groundwater artificially replenished
water underflow;
Surface water (rivers, reservoirs,
lakes, canals)
Conclusion on the suitability of the water source must contain the
following information:
On the subject of
water supply and
sanitary
characterization
planned to use the
water source
The quality of the
water supply source
and forecast its
condition at the
settlement period
On measures for the
organization of
sanitary protection
zone and the
planned water
treatment water
source in order to
bring the quality
water requirements
for drinking water
Rules for the selection and evaluation of the suitability of the
water source:
hydrogeological
data
Water quality
analysis
When surface
water sources
Domestic, industrial
and agricultural
pollution
Minimum and average
water consumption,
according to their
expected taps
New educational technology used To engage in
The method of "Round Table"
Divide the group into small groups of 2-3 people,
each MG offer sheet with the issue and ask for 1-2
minutes, write the answer to the question, and then
pass another piece of MG and MG to take from the
other, and so the next question Thus, if arrange 5 mg
(2 students for 1 table), the teacher hands out of 5
questions, and ultimately each piece should be 5
replies. After 12 minutes, the teacher collects all
sheets, analyzes the quality of the submitted answers
aloud and exposes evaluation of each MG whose 5
correct answers, "choir" 4otvetov "Satisfactory" 3
responses to "unsatisfactory" for at least 2 correct
answers.
Version of the proposed questions:
What are the requirements for
sanitary water supply sources?
Importance to the organization of
sanitary protection zone of water
supply sources. How to define the
boundaries of strict regime belt
groundwater sources? Which mode
is established in the territory of one
belt SBV underground sources?
How to settle the border zone
restrictions underground sources?
"Fish skeleton"
Planning a choice of
open source water
reservoir corresponding
to class 2 for water
supply
Water quality does not
meet the SST 950-2011
A Organization of the
SOA
Development of
…
preventive measures
To improve the quality
of water taken
coagulation, filtration
and disinfection
To establish the
boundaries of the SOA
necessary sanitary
topographical survey
28
The method of "clusters"
Economic fecal sewage
foodstuffs
maintenance
bath
laundri
es
Factors causing
contamination of
drinking water
vegetables
Manufacturing
water
industry
Cultural
hairdresser
Methods
of
improving
water
quality
filtering
chlorination
textile
polyme
rs
Light
industry
settling
29
New educational technology used in the
lesson
topic
Ground
waters
Rivers
Interstratal
pressure water
Interstratal nonpressure water
reservoirs
pond
test questions
What are the two forms of the
SS. What are the standards for
water consumption of drinking
water per person. Justification
standards to ensure the safety of
drinking water in relation to the
epidemic. Justification of rules
to ensure the harmlessness of
the chemical composition of
drinking water.
continue
• What are the requirements to the device wells,
spring catchments? Sanitary requirements for
water quality in the local water supply. What you
know water sources? What are the requirements
for sanitary water supply sources? Importance to
the organization of sanitary protection zone of
water supply sources. Composition waterworks
river running water.
References
• "Main: 1. "Health" under the guidance of prof.
Demidenko NM T. 2003 2. Guide to laboratory
work on communal hygiene Goncharuk EI
Moscow 1990 3. Sh.T.Otaboev, T.I.Iskandarov,
G.T.Iskandarova "Kommunal hygiene" Tashkent
2010 th. 4 "Kommunal gigienadan Amal
mashgulotlar Uchun ukuv kullanma. "Edited by
Academician Iskandarova TI T. 2006y 5.
"Communal Hygiene" E.I.Goncharuk Kiev in
2007 I, II part
Further Reading
• - GT Iskandarova "Regional san. gig. problems of
protection of water sources "water inpatient
population of Uzbekistan. T. 2001. - Health rules
and regulations of planning and building of
settlements of the Republic of Uzbekistan 0003-93
- Sanitary norms of admissible levels of
electromagnetic fields of radio frequencies 0064-96
- Sanitary rules of design and maintenance of
cemeteries 0086-99 - Health rules and regulations
and the optimum allowable building density
residential areas of cities of Uzbekistan 0144-03
continue
• Health rules and regulations design of
residential houses in the climatic conditions
of Uzbekistan 0146-04 - Health rules and
regulations setting up and maintaining
public toilets 0151-04 - Hygiene
requirements for institutions, organizations,
companies and individuals involved in the
disinfection activities 0177-04 - Health rules
and regulations for the use of mobile phones
0189-05 - Lecture materials.
Internet sites
O'z.Res.SSV veb-sayt
WWW.minzdrav.uz
TTA sayti – WWW.tma.uz.
htt://web.tma
TMA Wi-Fizone ZiyONet