GEM + MBR - Catering Water Recycle - Case Study

Introduction

An in-flight catering and commissary terminal (SATS) was in need for a more advanced wastewater treatment system, as their current wastewater treatment solution was inefficient and did not meet discharge requirements. CWT and its partners developed a solution which allowed ATS to not only treat their water to reduce discharge costs, but also allowed water re-use as well.

Challenge
The previous system consisted of a traditional DAF System, followed by traditional activated sludge treatment. The DAF System did not exhibit high enough removal efficiencies, which increased the overall cost for discharge. A new floatation system was required in order to meet the treatment demand.

In addition to primary treatment, client required an expanded process which allowed the re-use of water within the facility. CWT needed to install a new series of products which delivered full re-use water in the old DAF building.

Solution

• Replaced Existing DAF with GEM System
• Installed a Compact MBR System for BOD Removal
• A Skid Mounted RO Unit was Implemented for TDS Reduction
• The GEM System Doubled Flow Capacity
• Expanded from Primary Treatment to Tertiary Treatment within the Same Footprint
• Re-used Water Reduced $300,000 a Year in Cooling Water Costs

Before Treatment
*BOD=1500~3000mg/l BOD < 4 mg/l
*COD=1800~4000mg/l TSS < 1 mg/l
*Oil & Grease= 300~1500mg/l COD < 65 mg/l
*TSS = 1000~2500mg/l TDS < 1200 ppm
*TDS = 1000mg/l
*pH = 4~7 (equalization= 6~7)

After GEM+MBR
BOD < 4 mg/l
TSS < 1 mg/l
COD < 65 mg/l
TDS < 1200 ppm

After RO Treatment
BOD < 1 mg/l
TSS TDS < 82 ppm

CWT’s Full Wastewater Treatment Recycle Solution was able to help SATS meet their wastewater recycle needs. CWT was able to reduce the required footprint, provide easier operation, meet discharge requirements and reduce discharge costs, all while expanding a primary treatment system to a full recycle solution.