The City of Houston s Approach to Odor and Corrosion Management
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1 The City of Houston s Approach to Odor and Corrosion Management August 5, 2015 Presented By: Jason A. Iken, Senior Assistant Director
2 Introduction Houston at a Glance Wastewater Infrastructure Biosolids Management Program Wastewater Odor and Corrosion Control Program
3 Houston at a Glance Fourth largest City Founded in inches of rain Unstable Soils = Pipe Leaks Unstable soils Flat terrain 2.2 million people served 669 square miles 590 square served
4 Wastewater Infrastructure 40 Permitted WWTPs 229 MGD Actual (5yr Avg) 565 MGD Permitted 3 Wet Weather Facilities 26 Chemical Feed Facilities 7 Sludge Transfer Systems 386 Lift Stations 34.3 LF Collection Lines 1.54 Mil LF Force Mains 125,000 Manholes
5 Houston Area: 669 Square Miles The land area of all these cities COMBINED would fit within Houston s land area.
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7 Waste Activated Sludge (WAS) Public Utilities - Wastewater Operations Excess, inert, old or dead solids captured in clarifier TSS level = 0.2 to 1% solids (by weight) Transport, process and final destination
8 Sludge / Biosolids Handling Public Utilities - Wastewater Operations Liquid Sludge Pump-Away Plants (14 plants) Liquid Sludge Haul-Away Plants (13 plants) Biosolids Preparer Plants (13 plants)
9 Sludge / Biosolids Handling End dump & tanker trailers State & Federal DOT regulations COH/Special Waste Manifesting Weighing
10 Biosolids Storage Storage in solids handling processes Silos & trailers Land application sites (7 day & 30 day)
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13 Wastewater Odor and Corrosion Control Program Collection System Odor Control System Wide Approach Hot Spot Analysis Monitoring Program Control Strategies
14 Collection System Odors Buried Assets Complaint source vs cause Reactive O & M Design parameters influence emissions Regionalized treatment Comprehensive odor & corrosion strategy Public Utilities - Wastewater Operations
15 Liquid Phase Odor Control Odor & corrosion control Targeted on sulfide Low capital cost O & M intensive Comprehensive odor control difficulties Ventilation dynamics Multiple control points
16 Vapor Phase Odor Control Variety of technologies Treat areas of chronic odor emissions Corrosion reduction High capital cost / low life cycle cost Large footprint Centralized approach Difficult to size Public Utilities - Wastewater Operations
17 System Wide Approach Comprehensive Identify objectives Minimize costs Prioritization Hot spot analysis Measurable Monitoring programs Cohesive Strategy Proactive Solutions Act Check Plan Do
18 Case Study - Northside Relief Tunnel 11 th / Bryce Monolithically cast-in-place tunnel inches in diameter Originally 13 miles Constructed early 80s Liner failure early 90s Odor complaints from the start
19 Scale in Feet Chemical Storage Fans and Ductwork Former Lift Station Wet Well Where 48 Trunks Converge Biotrickling filters NSRT Junction Box 90-inch W. 11 th Street
20 Condition Assessment Manned entry H 2 S > 25 ppm avg. Ventilation dynamics influences corrosion rate [Fan] Field testing
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22 Differenital Pressure (inh2o) Public Utilities - Wastewater Operations Bryce & Pineshade 12th & Ella 11th & Seamist th & TCJ 12th & Rutland Temple & Julian Fans Off RPM* 300 RPM 600 RPM RPM 1200 RPM 1500 RPM 1750 RPM :00 6:00 9:00 12:00 15:00 18:00 21:00 0:00 3:00 6:00 9:00 12:00
23 Recommendations Evaluated alternative strategies Incorporated Capital Improvement data NSRT undergoing rehab through CIP program Preferred solution 25,000 Vapor Phase Treatment Facility BTF BTF + Carbon Const. & O&M Operations Performance Flexibility Feasibility Safety Carbon Chem Feed Initial Capital = $600, Yr O&M = $2.05 M OPCC $1.27 M $1.60 M $0.66 M
24 Scale in Feet Chemical Storage Fans and Ductwork Former Lift Station Wet Well Where 48 Trunks Converge Biotrickling filters NSRT Junction Box 90-inch W. 11 th Street
25 Chemical scrubber: Use NaOH/Bleach Public Utilities - Wastewater Operations QUESTIONS?
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