solar energy based water purification system · the purification unit consists of high pressure...

SOLAR ENERGY BASED WATER PURIFICATION SYSTEM

1Dr.S.Prakash, 2DEEPAK TOPPO

1Professor and Head,

2UG Student

Department of EEE

BIHER, BIST, Bharath University

Chennai- 600073.

[email protected]

ABSTRACT

In this paper, we are making a water purifier which works on solar energy. The

basic principle behind this project is reverse osmosis. The solar radiations are collected by solar

panel. This energy is then stored in a battery. The battery is connected to the purification

unit through a electromagnetic relay. The purification unit consists of high pressure

motor , reverse osmosis system and the water tank. The high pressure creates the

necessary pressure required to carry out reverse osmosis. The microcontroller 8051 keeps

a watch to the level of water in the water tank and prevents it from over flow. Through

this process we obtain the purified water in the water tank.

1. INTRODUCTION

The decreasing availability of water has necessitated in the search for fresh sources of

drinking water. The available water in many areas in the country is brackish, saline or impure.

Salinity is a major problem in the coastal areas of Kutch and Gujarat. In our country pure

drinking water is a major problem in tribal/rural area .There are many processes available for

purification of drinking water like Chlorine tablets , Pot chlorination of wells, Slow and rapid

sand filters, Fluoride removal , Reverse osmosis plants, etc .In this project, we are making a

water purifier which works on solar energy.[1-3] The basic principle behind this project is

reverse osmosis. We are using solar energy which is a renewable source, abundant and cheap. In

International Journal of Pure and Applied MathematicsVolume 119 No. 12 2018, 7863-7873ISSN: 1314-3395 (on-line version)url: http://www.ijpam.euSpecial Issue ijpam.eu

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case of power failures, this purifier will continue to work as solar energy can be stored. Here, we

use microcontroller 8051 which prevents the water from over flowing. This purifier can be used

in remote and rural areas where there is no electricity. It can also be used in places affected by

natural disasters. It also reduces the salt content in sea water. It provides pollution free operation.

2. BLOCK DIAGRAM

PURIFICATION UNIT

Figure 1 Block Diagram of Solar Energy Based Water Purification System

The solar radiations are collected by solar panel. This energy is then stored in a battery

through a charge controller.[2-8]The charge controller prevents the battery from getting

overcharged. The battery is connected to the purification unit through an electromagnetic

relay.The battery is also connected to a voltage regulator.The voltage regulator converts 24V to

+5V,which is required by the microcontroller. The purification unit consists of high pressure

motor , reverse osmosis system and the water tank. The high pressure creates the

necessary pressure required to carry out reverse osmosis. The microcontroller 8051 keeps

IMPURE WATER TANK

CONTROL SWITCH

MICROCONTROLLER

8051

INTERFACE UNIT

RELAY

BATTERY

CHARGE CONTROLLER

HIGH

PRESSURE

MOTOR

SOLAR PANEL

PURE

WATER

TANK

R.O

SYSTEM

VOLTAGE

REGULATOR

R

International Journal of Pure and Applied Mathematics Special Issue

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a watch to the level of water in the water tank and prevents it from over flow. Through

this process we obtain the purified water in the water tank.[3-10]

2.1 SOLAR ENERGY

Solar energy can be a major source of power.Its potential is 178 billion MW which is about

20,000 times the world’s demand. But it cannot be developed on large scale. Sun’s energy can be

utilised as thermal and photovoltaic’s.The solar power where sun hits atmosphere is 1017

watts,

whereas the solar power on earth’s surface is 1016

watts. The total world – wide power demand

of all needs of civilization is 1013

watts. Therefore, the sun gives us 1000 times more power than

we need.The energy radiated by the sun on a bright sunny day is approximately 1kw/m2, which

may be used in driving the prime movers for the purpose of generation of electrical energy.Some

applications of solar energy aresolar water heater, solarcookers,Solar furnaces,Solar

ponds,Solar energy collectors,Solar energy storage etc.[9-11]

2.2 SOLAR PANEL

In this paper, solar energy is being collected by using a solar panel. The collected solar energy is

being stored in the battery. In case of rural and remote areas and the areas affected but natural

disasters where electricity is a big problem, [12-14]this stored energy can be used for the

purification of water. The charge controller used here controls the required amount of

solar energy to be stored in the battery.


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Figure 2 Solar Panel

2.3 REVERSE OSMOSIS

When two solutions of different concentrations are separated by a semi-permeable

membrane, solvent (water) flows from a region of lower concentration to higher concentration.

This process is called osmosis. [25-23]This driving force in this called osmotic pressure.If a

hydrostatic pressure in excess of osmotic pressure is applied on the higher concentration side, the

solvent flow is reversed i.e., solvent flows from higher concentration to lower concentration.

This process is called reverse osmosis. Thus, in the process of reverse osmosis pure water is

separated from salt water.

Figure 3 RO process


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Figure 4 RO components

3 HARDWAREDESCRIPTIONS

3.1 Power supply circuit

Figure 5 Circuit diagram of power supply circuit

In this paper we are using 24V, 40W solar panel and a 24V, 7.5A battery. The battery is

being charged by the solar panel through a charge control relay. The maximum charge holding

capacity of the battery is27.6V.A charge controller has been connected across the battery to

prevent it from getting overcharged i.e., above 27.6V.A diode has been used in this circuit to

maintain the current in one direction. [17-19]The voltage regulator circuit has been used which

converts 24V to +5V,as the microcontroller accepts a constant +5V.The regulated DC supply is

used for the microcontroller and the unregulated DC supply is used for the motor and relay.

3.2Control Circuit


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Figure 6 Circuit diagram for control circuit

The control circuit mainly consists of the microcontroller P89V51RD2BN and an LCD

display.The microcontroller accepts three inputs at the following situations :-

i)When the battery is overcharged

ii)When the water tank overflows

iii)When the water tank is empty

The microcontroller gives three output signals to the relay control circuit.A 16*2 LCD display

has been used here.[14-18]The ON/OFF switch is manually operated.Whenever the tank is

empty,the ON switch is operated and whenever it is filled, the OFF switch is operated.The

RESET switch is automatically operated.[40-45]

3.4 HARDWARE KIT


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Figure 7 Hardware kit of water purifier system

CONCLUSION

As solar energy is being used for the purification of water, which is cheap and abundant, it

can be used everywhere where electricity is not available. Here, the microcontroller which is

used also prevents the water from overflowing. Moreover, reverse osmosis is a good disinfectant

process .This project has only capital cost and almost no running cost. Hence, It will prove

to be useful in the near future.

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solar energy based water purification system · the purification unit consists of high pressure...

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