ORANGE COUNTY SANITATION DISTRICT BIOSOLIDS MASTER PLAN TECHNICAL MEMORANDUM 6: CIP PROJECT DEVELOPMENT FOR PLANT NO. 2 SOLIDS HANDLING FACILITIES OCSD PROJECT NO. PS15‐01 reserved. rights All 2015. Company Holding Veatch & Orange County Sanitation District ©Black 9 MAY 2017 In association with TM‐6: CIP Project Development for Plant No. 2 Solids Handling Facilities | Orange County Sanitation District Table of Contents Acronym and Abbreviations List ......................................................................................................................x Executive Summary ........................................................................................................................................ ES‐1 1.0 Introduction .............................................................................................................................................. 1‐1 1.1 Purpose ................................................................................................................................................................... 1‐1 1.2 Approach ................................................................................................................................................................... 1‐1 2.0 Background ............................................................................................................................................... 2‐1 2.1 Summary of TM‐4 Findings ............................................................................................................................... 2‐1 2.2 Summary of TM‐5 Findings ............................................................................................................................... 2‐1 2.3 Geotechnical Evaluation of Proposed Facilities ........................................................................................ 2‐2 3.0 Process Requirements for Future Digestion and Pre‐Processed SSO Co‐Digestion Facilities ..................................................................................................................................................... 3‐1 3.1 Solids Flows and Loads ....................................................................................................................................... 3‐1 3.2 Pre‐Processed SSO Loads ................................................................................................................................... 3‐1 3.3 Design Criteria ........................................................................................................................................................ 3‐2 3.4 Process Performance ........................................................................................................................................... 3‐3 3.4.1 Digester Performance ............................................................................................................................ 3‐3 3.4.2 Digester Gas Production ....................................................................................................................... 3‐4 3.5 Process Heat Demand .......................................................................................................................................... 3‐6 4.0 Conceptual Design for Future Digestion and Pre‐Processed SSO Co‐Digestion Facilities ..................................................................................................................................................... 4‐1 4.1 Process Flow Diagram ......................................................................................................................................... 4‐1 4.2 Process Design ........................................................................................................................................................ 4‐2 4.2.1 Thermophilic Digesters (110‐ft Diameter) ................................................................................... 4‐2 4.2.1.1 Description ........................................................................................................................................... 4‐2 4.2.1.2 Major Equipment List ...................................................................................................................... 4‐3 4.2.1.3 Facility Layout ..................................................................................................................................... 4‐3 4.2.2 Mesophilic Digesters (105‐ft Diameter) ......................................................................................... 4‐5 4.2.2.1 Description ........................................................................................................................................... 4‐5 4.2.2.2 Major Equipment List ...................................................................................................................... 4‐6 4.2.2.3 Facility Layout ..................................................................................................................................... 4‐6 4.2.3 Mesophilic Digesters (80‐ft Diameter) ........................................................................................... 4‐7 4.2.3.1 Description ........................................................................................................................................... 4‐7 4.2.3.2 Major Equipment List ...................................................................................................................... 4‐7 4.2.3.3 Facility Layout ..................................................................................................................................... 4‐8 4.2.4 Digested Sludge Holders (80‐ft Diameter) .................................................................................... 4‐9 4.2.4.1 Description ........................................................................................................................................... 4‐9 4.2.4.2 Major Equipment List ...................................................................................................................... 4‐9 4.2.4.3 Facility Layout ................................................................................................................................... 4‐10 4.2.5 Digester Feed Facility (DFF) .............................................................................................................. 4‐10 Final – May 9, 2017 ii Biosolids Master Plan Orange County Sanitation District | TM‐6: CIP Project Development for Plant No. 2 Solids Handling Facilities 4.2.5.1 Description ......................................................................................................................................... 4‐10 4.2.5.2 Major Equipment List .................................................................................................................... 4‐11 4.2.5.3 Facility Layout ................................................................................................................................... 4‐11 4.2.6 TPAD Class A Batch Tanks ................................................................................................................. 4‐12 4.2.6.1 Class A Batch Tank Evaluation and Justification ................................................................. 4‐13 4.2.6.2 Reactivation and Regrowth Potential with Class A ........................................................... 4‐15 4.2.6.3 Class A Batch Tank Number and Sizing .................................................................................. 4‐16 4.2.6.4 Description ......................................................................................................................................... 4‐17 4.2.6.5 Facility Process Flow Diagram ................................................................................................... 4‐17 4.2.6.6 Major Equipment List .................................................................................................................... 4‐18 4.2.6.7 Facility Layout ................................................................................................................................... 4‐19 4.2.7 TPAD Sludge Cooling ............................................................................................................................ 4‐19 4.2.7.1 Description ......................................................................................................................................... 4‐22 4.2.7.2 Major Equipment List .................................................................................................................... 4‐22 4.2.7.3 Facility Layout ................................................................................................................................... 4‐22 4.2.8 Interim Pre‐Processed SSO Receiving ........................................................................................... 4‐24 4.2.8.1 Description ......................................................................................................................................... 4‐24 4.2.8.2 Major Equipment List .................................................................................................................... 4‐26 4.2.8.3 Facility Layout ................................................................................................................................... 4‐27 4.2.9 Ultimate Pre‐Processed SSO Receiving ........................................................................................