Surface Grinding at Chung On Estate, Ma On Shan, N.T.

The project involved the use of a disc grinder to smoothen the external wall of the superstructure at Ching On Estate.

Environmental Concern

Without proper dust control measures, large amount of dust would be released during surface grinding and would impair the general air quality in the vicinity. In order to reduce the dust, the gondola was covered with canvas on three sides and water spray was used during grinding. However these measures were not very effective resulting in dust still emitting in significant quantity.

	Dust was generated during grinding despite the gondola was covered on 3 sides

Measures Adopted

Vacuuming - The concrete surface grinding process was improved by using a new concrete planer equipped with local dust extraction filter.

New grinder with local dust extraction filter

Observations & Achievements

The use of local dust extraction filter was proved to be effective. No dust emission from grinding was detected after the dust extraction system was installed. The general air quality in the surrounding area was much improved. Furthermore, the workers worked in a much better environment.