The Dewatering package of Kangan Petro Refining

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1 General Overview and Process Description

Based on Kangan Petro-Refining Company’s requirement, a dewatering unit for decanting 5 m3/h of sludge with about 1.5-2.5% solid content was provided. The final sludge cake solid content based on client order shall have been at least 20%. Considering the above-mentioned specification, A dewatering package consisting of Cationic Polyelectrolyte Dosing and the Sludge Dewatering machine with related sludge feed pumps were designed, constructed, and prepared.

2 Feed Specification

Below table shows the inlet sludge specification:

Kangan project Feed Specification

Stream

Flow(m3/hr)

TSS (ppm)

Density(kg/m3)

Flow(Ton/hr)

Biological Sludge Stream

5

~26000

~1050

5.2

The addition of polymers is the most common method to increase the efficiency of Decanter for separating water and sludge. So, the Polyelectrolyte Dosing Package with three-compartment vessel and mixers designed for mixing dry Cationic Polyelectrolyte powder with water and homogenizing of solution.

The prepared polymer is mixed with sludge, which is pumped by sludge feed pumps. Then the conditioned sludge is transferred into a Centrifuge Dewatering Machine (Decanter). The sludge cake from the centrifuge contains at least 20% solids, and solids capture of a minimum of 95 percent is achieved.

3 Discharge Specification

Kangan project Products

Stream

Flow(m3/hr)

Solid (ppm)

Supernatant

~5.6

~4000

Sludge Cake

~0.3

~350000

Required Utility:

  • Plant Water
  • Electricity

4 Schematic of Kangan Dewatering Package is shown as below: