chapter - 1 introduction - Meghalaya State Pollution Control Board

Hills Cement Co. Limited.
shall be required for steam generation and cooling circuits. 80-85% water is
recirculated. About 150 M 3 /day shall be the net consumption. Evaporation
losses from cooling tower and other places account for nearly 100 M 3 / day.
Waste water from various streams shall be 50 M 3 / day. This waste water
along with waste water from cement plant (nearly 30 M 3 / day) and 80 M 3 /
day domestic effluent shall be separately or jointly treated in effluent
treatment plant. It shall be used for ash quenching, ash handling system,
dust suppression system in coal storage area, and greenery development.
The intake water system will consist of an intake pump house near raw water
reservoir. The intake pump and associated pipe work have been planned
such that it is sufficient to run the pump for about 48 hours to meet the plant
requirement.
Make-up water system:
Make-up water system will consist of the following major items of equipment:
1) Raw water treatment plant (RWTP) with raw water pump sets will be
installed to meet the entire make-up water requirements of power
plant.
2) Raw water pipe work from storage sump to RWTP.
3) Make-up water pipe work from RWTP to filter and softener and to
cooling water basin cum storage sump.
The break-up of make-up water for various consumers are given below.
S.No. System Normal (Approx.)
Make-up water (m 3 / hr)
1. Air Cooling water system 5.0
With Aux cooling Tower
2. Demineralised make-up water for boiler 3.0
3. Requirements of demineralization plant, 2.0
Sludge, back wash, and regeneration
The total blow down from the cooling tower is expected to be about 6 m 3 / hr
during normal condition.
The entire blow down water will be used in dust suppression system and
green belt development.
Demineralization & Softening Plant:
The condenser extraction pumps at the condensate storage tank pump the
condensate form the surface condenser. The make-up from DM water
storage tank will be added to the condensate storage tank. Boiler feed water
from this condensate storage tank will be pumped to the deaerator through
Pollution Control Consultants (India) Pvt. Ltd. 26