Water requirement Design

       WATER TREATMENT PLANT

For water treatment plant, the design will be based on final throughput due to it was not easy to handle double water treatment plant.

1.      Water consumption per tonne FFB process = 1.5m³ to FFB

2.      Average processing hour                                           = 20 hours

3.      Reservoir capacity                                                     = 40 days

Water requirement for 80 tonne / hour FFB process

                        = 80 tonne/hr x 1.5

                        = 120 tonne water/hour.

5.2 Reservoir Capacity.

Reservoir capacity      = 40 days x 120 tonne water/hour x 20 hours

                                    = 96000 m³

                       

The reservoir capacity for 40 days is important during dry season and during high type (high in chloride).

5.3 Pump Sizing.

For pump from river to reservoir, the capacity should be higher in case of emergency, it can pumping at high rate.

Therefore, propose for                        = 120m³/hour x Safety factor

                                                            = 180m³/hr

Only one unit required for this station due to have holding capacity of 40 days.

For pump from reservoir to water clarifier,

                                    = Safety factor x water requirement

                                    = 1.1 x 120 m³/hr

                                    = 132 m³/hour.

This station need 2 unit of pump where 1 unit running and the other one on standby.

5.3 Water Clarifier Sizing

Retention time             = 3 hours.

Therefore, Clarifier capacity = Retention time x Water requirement/hour

                                                = 3 hours x 120 m³/hr

                                                = 360 m³

5.4 Water Tank Sizing

Allowed holding time of 4 hours        = 4 hours x water requirement/hr

                                                            = 4 x 120m³

                                                            = 480 m³

The water tank is a over head tank where, for all the process will come in gravity flow.

Waste Water Treatment Plant

Data given:

            Steriliser Condensate  = 12% to FFB

            Sludge                         = 50% to FFB

            Claybath water            = 0.05% to FFB

At 80 tonne/hour milling capacity, total amount of waste water produced will be:

Sterilizer condensate  = 80tonne/hour x 0.12 = 9.6 tonne/hour

Sludge                         = 80tonne/hour x 0.50 = 40 tonne/hour

Claybath water            = 80tonne/hour x 0.05 % = 0.04tonne/hour

Total                            = 49.64 tonne/hour

Based on 20 hours operation per day, 49.64 tonne/hour x 20 hour = 992.8 tonne

For this mill, the layout of effluent treatment plant is as attached.

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