Why Treat Wastewater?

Pollution Control:- Conversion of Units

Typical Wastewater Treatment Flow Chart

NATIONAL AMBIENT AIR QUALITY STANDARDS :- INDIA

Notification G.S.R - 826(E) dated
16^th November, 2009

Ref: - The Environment (Protection) Seventh Amendment Rule 2009

SCHEDULE VII: - NATIONAL AMBIENT AIR QUALITY STANDARDS :-INDIA

[See Rule 3(3B) of EP Rule 1986]

SCHEDULE VII of Environment Protection Rule 1986

SN	Pollutants	Time Weighted Average	Concentrations in Ambient Air
			Industrial, Residential, Rural and Other Area		Ecologically Sensitive Area (Notified by Central Govt.)	Methods of Measurement
(1)	(2)	(3)	(4)		(5)	(6)
1	Sulphur Di-oxide, SO₂,  (µg/m³)	Annual* 24hours**	50 80		20 80	-Improved West & Gaeke. -Ultraviolet Fluorescence.
2	Nitrogen Di-oxide, NO₂,  (µg/m³)	Annual* 24hours**	40 80		30 80	-Modified Jacob & Hoehhelser (Na-Arsenite). -Chemiluminescence.
3	Particulate Matter (Size less than 10µm) or  PM₁₀,  (µg/m³)	Annual* 24hours**	60 100		60 100	-Gravimetric -TOEM -Beta Attenuation
4	Particulate Matter (Size less than 2µm) or  PM₂.₅,  (µg/m³)	Annual* 24hours**	40 60		40 60	-Gravimetric -TOEM -Beta Attenuation
5	Ozone, Oᴣ, (µg/m³)	8hours** 1hour**	100 180		100 180	-UV Photometric - Chemiluminescence -Chemical Method
6	Lead, Pb, (µg/m³)	Annual* 24hours**	0.5 1.0		0.5 1.0	-AAS/ICP Method after sampling on EPM 2000 or equivalent filter paper. - ED-XRF using Teflon Filter
7	Carbon Monoxide, CO, (µg/m³)	8hours** 1hour**	02 02		04 04	-Non-Dispersive Infrared (NDIR) Spectroscopy.
8	Ammonia, NHᴣ, (µg/m³)	Annual* 24hours**	100 400		100 400	- Chemiluminescence -Indophenol Blue Method
9	Benzene, C6H6, (µg/m³)	Annual*	05		05	-Gas Chromatography based continuous analyser. - Adsorption &Desorption followed by GC analysis.
10	Benzo Pyrene (BaP)- Particulate Phase only, (ng/m³)	Annual*	01		01	-Solvent extraction followed by HPLC/GC analysis
11	Arsenic (As), (ng/m³)	Annual*	06		06	-AAS/ICP Method after sampling on EPM 2000 or equivalent filter paper.
12	Nickel, (Ni), (ng/m³)	Annual*	20		20	-AAS/ICP Method after sampling on EPM 2000 or equivalent filter paper.

* Annual arithmetic mean of minimum 104 measurements in a year at a particular site twice a week 24 hourly at uniform intervals.

** 24 hourly or 8 hourly or 01 hourly monitored values, as applicable, shall be complied with 98% of the time in a year. 2% of the time they may exceed the limits but not on two consecutive days of monitoring.

Note- Whenever & Wherever monitoring results of two consecutive days of monitoring exceeds the limits specified above for the respective category, it shall be considered adequate reason to institute regular or continuous monitoring & further investigation.