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TERI Information Digest on Energy and Environment
Year : 2002, Volume : 1, Issue : 1
First page : ( 130) Last page : ( 132)
Print ISSN : 0972-6721.

From standards, patents, newsletters, government documents and notifications, annual reports, etc.

Environmental patents


Exhaust gas pollutant reduction system
An exhaust system for an internal combustion with a catalytic converter connected to the exhaust pipe for cleaning the engine exhaust gas in the presence of a reducing agent also includes a condensation water collector into which the exhaust gases are diverted prior to reaching the catalytic converter. The collector condenses moisture in the exhaust gas to produce liquid water condensate that is held in a reservoir. The water condensate is combined with a reactant capable of forming a reducing agent and the aqueous solution of the reactant is introduced into the exhaust gas upstream of the catalytic converter.
Patent on System and method for reducing pollutants in the exhaust gas of an internal combustion engine
Patent number US 6,357,227
Invented by Neufert R
Filed by Siemens Aktiengesellschaft, Munich, Germany, on September 27, 2000
Granted on March 19, 2002
[Source: www.uspto.gov]

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Waste water purification device
A device for the purification of polluted water, especially adapted to remove therefrom organic pollutants. The device makes use of a reactor wherein the polluted water is subjected to the combined action of an ozone containing gas in the presence of an oxidation reaction catalyst that is produced in situ by electrolysis. A method of use of this device is also disclosed.
Patent on Device and method for the purification of polluted water
Patent number US 6,315,887
Invented and filed by Salama A, 600 Robitaille, Granby, CA, USA on November 8,1999
Granted on November 13,2001
[Source: www.uspto.gov]

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Environmental standards


Standards for new diesel generator sets
The Central Pollution Control Board has proposed emission standards for diesel generators (at the manufacturing level) up to 800 kW. The draft of this notification has already been sent to the Ministry of Environment and Forests for its approval. As of now, emission standards existed only for petrol and kerosene based generators. The proposed standard is given below:

Diesel generating set engine capacityNOx (gm/KWh)Hydro-carbon (g/kWh)CO (g/kWh)Particulate matter (g/kWh)Light absorption capacity meter at full load*Date of implemen-tation

Up to 260 kW9.21.33.50.300.701 January 2003
>260 kW up to 800 kW9.21.33.50.300.701 January 2004

*For small diesel generating set with engine capacity up to 50 KW, the particulate matter emission limit is relaxed to 0.5 g/kWH for one year i.e. January 2003 to December 2003

[Source: Green Business Opportunities. 2002, 8(1): 6]

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Environmental law/Government notifications


Noise limits for vehicles with effect from 1 January 2003
The Ministry of Environment and Forests in a draft notification proposed the following noise limits for vehicles that shall be applicable from 1 January 2003. The test method to be followed shall be IS: 3028-1998.

Type of vehicleNoise limit (dB)

Two-wheeler
  Displacement up to 80 cm375
  Displacement more than 80 cm3 but up to 175 cm377
  Displacement more than 175 cm380
Three-wheeler
  Displacement up to 175 cm377
  Displacement more than 175 cm380
Passenger car75
Passenger or commercial vehicle
  Gross vehicle weight up to 4 tonnes77
  Gross vehicle weight more than 4 tonnes but up to 12 tonnes80
  Gross vehicle weight more than 12 tonnes82

The existing limits on pass-by noise shall continue with the test method IS 3028-1008 till 1 January 2003.
[Source: Enviro News. 2001, 5 (March-April): 10]

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Draft Proposals for Himalayan environment protection: rainwater harvesting
The Ministry of Environment and Forests proposed to issue a notification to protect and improve the quality of environment in the Himalayas. The North-eastern states, Uttaranchal, and parts of Uttar Pradesh and West Bengal are in the scope of this notification. In order to ensure environmentally sound development of hill towns, the following restrictions and conditions are proposed for all future construction activities in the areas in the Himalayan region.
  1. All buildings to be constructed in future, in urban areas, should have provision for roof-top rainwater harvesting commensurate with its plinth area with minimum capacity of 5 KL (kilolitre) for plinth area above 200 m2, 2 KL for plinth area of 200 m2 or below in case of residential build ings and minimum capacity of 0.01 m3/m2 of plinth area in case of commercial and institutional buildings such as tour ist complexes, hotels, shopping complexes, and govern ment buildings, provided that the minimum standards for commercial and institutional buildings shall also apply to such buildings in areas not covered within the limits of urban areas.

  2. Where minimum standards have already been laid down by the state governments, such standards shall take precedence.

  3. The institutional and commercial buildings should not draw water from the existing water supply schemes, which adversely affects water supply to local villages or settlements.

  4. In rural areas rain water harvesting should be undertaken through such structures as percolation tanks and storage tanks and any other means.

  5. Spring sanctuary development should be undertaken in the spring recharge zones to augment spring water discharge.

  6. Rain water collected through storm water drains should be used to clean the waste disposal drains and sewers.

  7. Groundwater aquifer recharge structures should be constructed wherever such structures do not lead to slope instabilities.

[Source: EnviroNews. 2001, 5 (March-April): 11]

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