Coimbatore Manufacturing Industry Case Study

INDOOR AIR QUALITY MONITORING IN FOUNDRIES AT COIMBATORE 1V.SENTHILKUMAR 2Dr.A.MURUGAPPAN 3Dr. M.ISAAC SOLOMON JEBAMANI

1Ph.D Scholar, Dept. Of Engg & Tech, Annamalai University, Annamalai Nagar, Tamilnadu, India

2Professor, Annamalai University, Annamalai Nagar, Tamilnadu, India

3Professor, Government College Of Engineering, Coimbatore, Tamilnadu, India

ABSTRACT:

The present study deals with the assessment of Indoor Air quality at four different industries in Coimbatore. The steel products are manufactured using the molten lava. Generally smokes and fumes are emitted into the atmosphere from foundries. The workers in a foundry may have to inhale the smokes and fumes. It was proposed to monitor the air quality within the

Calibration Curve for SO2

Determination of Nitrogen oxides in ambient air :

Concentration of NOx in ambient air is estimated by Jacob Hochheiser method. Oxides of nitrogen are collected from bubbling air through sodium hydroxide solution to form stable sodium nitrite. The nitrite ion produced is determined photometrically by reacting with phosphoric acid, sulfanilamide and NEDA at 540 nm.

Gases are sucked through a tapping provided on the suction side of the blower in HVS through a set of impingers containing 30 ml of absorbing solution. A flow rate of 1.2 liters per minute was maintained in rotameter for 24 hours sampling period. Record the initial flow rate along with the sampling time and date were also recorded.

After 24 hours of sampling, the final flow rate was recorded before putting off the HVS. The solutions from the impingers were transferred to sampling bottles and were kept in the ice box.

Calibration curve for NOX:

Dilute 5.0 ml of the 1000µg NO2/ ml solution to 200 ml with absorbing reagent. This solution contains 25 µg NO2/ ml. Pipette accurately 1.0, 1.5, 2.0, 2.5, and 3.0 ml of 25 µg NO2/ ml solution into a series of 50 ml volumetric flasks and dilute to the mark with absorbing

The concentration of oxides of nitrogen is calculated as follows:

NOx =

Where, micrograms of NOX can be determined from the NOX calibration curve.

0.35 = factor for collection efficiency. Calibration Curve for NOx

AIR POLLUTION INDEX :

An air pollution index is defined as a scheme that transforms the values of individual air pollution related parameters into a single number or set of numbers.

There are several methods and equations available for determining the air pollution index.

For the thesis the following equation was used.

API = 1 SPM + RPM + SO2 + NOX X 100 4 SSPM SRPM SSO2 SNOX

Where SSPM, SRPM, SSO2, SNOX represent the ambient air quality standards for Suspended particulate matter, Respirable particulate matter, Sulphur dioxide and nitrogen dioxide respectively.

Rating scale for indices : Air pollution index Remarks

0 – 25 Clean air

26 – 50 Light air pollution

51 – 75 Moderate air pollution

76 – 100 Heavy air