WASTE WATER TREATMENT PLANT

The waste water treatment plant shall take waste water produced on site as a result of the power generation process, building, and surface drainage and domestic and sewage waste water from the whole site and shall ensure that the final discharge point meets the requirements of as set in Indonesian Environmental Regulation for waste water standard.

The waste water from unit 3 and 4 such effluent from metal cleaning, from ash run-off pond, coal run-off pond, demineralization plant, chemical reagent system, etc.

The existing Neutralization Plant will be used to treat the effluents from ion exchanger in demineralization plant of unit 1 – 4 and drainage from reagent system. Effluent from cleaning equipment and system such as boiler, air heater, etc. will be treated by existing Metal Cleaning WWTP.

The Bidder shall integrate above existing facilities plant to future (unit 3 and 4) in relation to all interfacing system with the WWTP.

A new ash and coal run-off water treatment plant shall be provided with permit safe and adequate retaining, intermediate storage and treatment of all waste water, run-off and spillage. The treated waste water will be discharge to Asam Asam River via waste water pumping pit and station.

The ash and coal run-off WTP shall have following characteristic :

-          flow rate : 12 m³/h

-          automatic operation

Parameter	Unit	Ash dump run-off		Coal storage run-off
		Mean	Range	Mean	Range
Flow	M3/h	4	3÷6	6	4÷8
pH	pH unit	10	7÷12	6	4÷6
TSS	Mg/l	500	2000	500	2000
Heavy metals	Mg/l	< Std.	< Std.	< Std.	< Std.

< Std. = below limit of applicable Waste Water Quality Standard

Parameter of treated water shall meet the waste Water Standard Group II requirements as per Indonesian Waste Water Quality Standard with only exception of the limitation on dissolved solids.

The new ash Water waste Treatment Plant will include, but not limited to :

-          ACRO buffer tank

-          ACRO feed pumps

-          Neutralization tank

-          Reaction tank

-          Clarifier

-          Sludge pumps

-          Monitoring tank

-          ACRO effluent tank

-          ACRO flushing pumps

-          Recycled water pumps

To feed chemical reagents such :

-          Hydrochloric acid (liquid, 32% HCI)

-          Lime milk (liquid, 2.5 – 5.0% Ca (OH)₂)

-          Sodium hydroxide (liquid, 45% NaOH)

-          Ferric chloride (liquid, 40% FeCl₃) as coagulant

-          Polyelectrolyte (100% polymer powder) as coagulant aid (solution of 0.1 – 0.5% polymer for dosing)

Hydrochloric acid and sodium hydroxide will be sent from chemical storage by pipes. Ferric chloride will be transferred from drums through a drum pump.

Hydrochloric acis system consists of :

-          HCl dosing tank with HCI vapor trap

-          HCI dosing pumps

            Lime milk system consists of pipe from lime milk main ring of River Treatment Plant. Sodium hydroxide system consists of :

-          NaOH dosing tank

-          NaOH dosing pumps

Ferric chloride acis system consists of :

-          drum pump for FeCl₃

-          FeCl₃ dosing tank

-          FeCl₃ dosing pumps

Polyelectrolyte preparation and feed system consists of :

-          Polymer dosing unit (hopper, dry material feeder, dosing tank)

-          Polymer dosing pumps

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