Sludge Dewatering Filter Press Controls Upgrade at SSWRF

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Presentation transcript:

Sludge Dewatering Filter Press Controls Upgrade at SSWRF Award Contract S04012C01 Sludge Dewatering Filter Press Controls Upgrade at SSWRF Commission Agenda Item #4

Biosolids Processing & SSWRF Filter Presses District must process biosolids each day Biosolids composed of microorganisms and digested sludge Normal operation: biosolids processed at JIWRF During JIWRF biosolids processing outages, dewater biosolids using 4 operating filter presses at SSWRF

Sludge Dewatering Filter Press

Filter Press Dewatering Uses pressure filtration to separate liquid from solids Liquid filtrate returned to plant influent for treatment Concentrated solids or dewatered sludge called sludge cake Goal of process is to produce dry sludge cake while minimizing filtrate solids content

Filter Presses Installed early 1990s Controlled by PLCs - specialized computers that automatically control pumps, valves, and equipment Existing PLCs out of production for more than 15 years and no longer supported Failure of PLC requires specialized parts only available from secondhand market

Filter Presses Essential that filter presses be available for solids processing To ensure reliability of sludge dewatering process, staff recommends replacing filter press control system Proposed contract scope: replace PLCs, indicator lights, and operator interfaces

Filter Press Control Panel

Inside Filter Press Control Panel

Project Cost and Schedule Project within budget Contract duration 312 days

QUESTIONS?