Japanese Tobacco International


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Introduction

ACWA Services Ltd was awarded a turnkey contract to upgrade the industrial effluent treatment plant at the Japanese Tobacco International production facility in Torbali, Turkey.

The project design requirements were to upgrade the existing treatment facility in order to achieve an improved discharge quality whilst ensuring minimum disruption to the existing plant.

The original activated sludge plant treated a combined flow of domestic sewage waste plus the industrial waste from the cigarette processing facility. The upgrade included refurbishment of the existing activated sludge plant and aeration system and the addition of a small membrane bioreactor (MBR) stage. These modifications increased the capacity of the plant by 60%.

Design Information

The following table indicates the Influent and final effluent quality:

Description Units Influent Characteristics Effluent
Quality
Requirements
Average Maximum
Flow m3/day 175 366  
Suspended Solids mg/l 500    
BOD mg/l 2355 50
kg/day 412 862  
COD mg/l 4711 150
kg/day 824 1724  
TKN mg/l 16  
Phosphorus mg/l 1  
pH pH units 6.0 9.0 6.0 - 9.0
Temperature °C 25    

Description

The industrial effluent is transferred from the industrial equalisation basin to the aeration tank via an existing screen. The domestic effluent is transferred from the domestic effluent collection sump to the aeration basin via the same pipeline as the industrial effluent. Both wastewaters pass through a new 3mm screen prior to entry to the aeration tank.

The existing aeration tank was refurbished and upgraded to allow an existing primary sedimentation basin to be removed from operational service and also to ensure that increased biological loads could be treated. The upgrade included replacement of an air diffuser system with a fine bubble aeration system, new dissolved oxygen monitors and additional blowers.

From the aeration tank the mixed liquors are transferred by pumps into the new MBR treatment stage. Installation of an MBR process allowed the existing secondary sedimentation basin to be removed from operational service and also provide a treated effluent of much higher standard. The MBR tank installed has two compartments. Each compartment houses two Kubota flat-sheet double-deck membrane units (EK 400Õs). The mixed liquors flow across the membrane surface, allowing some of the treated effluent to permeate the membrane whilst the activated sludge remains within the tank. The treated effluent (permeate) gravitates from the tank to the discharge line. The return activated sludge (RAS) is recycled back to the aeration tank by gravity. The RAS flow is controlled by a flow meter and modulating valve. Each MBR zone is fitted with a dedicated air diffuser system to scour the membrane units.

Surplus activated sludge is removed periodically and transferred via sludge storage to a belt press for treatment. Dewatered sludge is removed from site, and sludge liquors are returned to the industrial equalisation basin.

Project Details

Client: Japanese Tobacco International, Turkey

Industry: Industrial Effluent Treatment

Application: Membrane Bioreactor

Technologies

Wastewater Treatment
Membrane Bio Reactor