COLEGIUL TEHNIC BUZAU, ROMANIACOMENIUS MULTILATERAL PARTNERSHIP

LIFE-GIVING WATER

This project has been funded with support from the European Commission.This publication [communication] reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein

Water as aliment

The human body's needs are well defined in terms of nutrition. We often forget that water is the main source of life, the essential element in maintaining body balance. Water is more necessary than any other aliment because of its action on all life processes.

IN THE BODY, WATER MEETS FOUR MAIN ROLES:

By circulating fluids (blood, lymph), it carries all the nutrients and oxygen while eliminating byproducts of digestion and metabolism;

-It has a plastic role as water enters directly in the process of body growth and formation of cells;

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Thermoregulation –it maintains a constant body temperature.

- All chemical processes of the body take place in the presence of water.

Fortunately the human body has receptors that sense the need for water extremely fast, triggering the sensation of thirst.

The water is the basis of the nutritional pyramid

A human needs about 100 liters of water per day: 4 liters for basic needs, as food (2.5 liters for drinking and 1.5 liters for cooking - without water we cannot survive more than a week), 13 liters for washing dishes, 13 liters for doing the laundry and 70 liters for sanitary needs.

By drinking water we understand the water intended for human consumption, that is, any type of water in its natural state or after treatment, used for drinking, food preparation or other domestic purposes.

Drinking water must be sanogenous (health-generating) and clean, free of microorganisms, parasites or substances which, in numbers or concentration, constitute a potential danger to human health;

Water quality can be defined as a set of conventional physical, chemical, biological and bacteriological characteristics, expressed in terms of value according to the drinking water law.

WATER’S CHARACTERISTICS

Thus, water should be colorless, odorless and having a pleasant taste.

Water pH is 6.5-7.5. The check of the pH is done with pH-indicator paper or with a pH meter.

Conductivity is measured with the TDS meter. The name of the device comes from Total Dissolved Solids and it is the total weight of solids (minerals, salts or metals) that are dissolved in a given volume of water. It is expressed in mS.

The value for drinking water is 1-3mS. A higher value represents a type of water that can be unpleasant to taste, salty, metallic or bitter.

 

WATER HARDNESS

the ions of Ca2+ and Mg2+ are responsible for the total hardness of water. They are determined based on the formation of stable complex combinations by their reaction with the solution of complexone III (EDTA), in basic medium and in the presence of specific indicators.

A hard water is difficult to digest, it is not advantageous for boiling food and uneconomic for washing.

The water supply in Buzau is made by using underground water. The main deficiencies in the quality of drinking water are a high content of bicarbonates of calcium and magnesium, and the iron content.

DETERMINATION OF RESIDUAL CHLORINE

Water is disinfected using chlorine, a biological mechanism of destruction of organic matter and bacteria.

Residual chlorine is determined with an ortodolidin solution - add 0.5 ml of ortodolidin in the water sample and the color that is obtained is compared with the colorimetric tubes that form a comparison scale.

Protect water-protect life

Authors: Razvan Alexandrescu, Alin Barbu

Thank you for attention!