MWEA Annual Conference 2013 Grandville CWP Egg Shaped Digester Unconventional Startup

Transcription

1 MWEA Annual Conference 2013 Grandville CWP Egg Shaped Digester Unconventional Startup Presented by: Todd Wibright, City of Grandville, and Brian Hannon, P.E., Moore & Bruggink

2 Presentation Agenda Brief Introduction to Project Solids Handling before and after Why ESD vs. Conventional Discussion of ESD Startup Micro-digestion Technique Seed Sludge Lab Analysis Operator Training Questions

3 City of Grandville Overview Grand Rapids US 196 Grandville 131

4 Grandville Clean Water Plant

5

6 Project Overview (Expansion and Renovation)

7 Solids Handling Prior to Project Aerobic Digestion Anaerobic Digestion Thickening Storage Land Application

8 Solids Handling Prior to Project Aerobic Digestion Anaerobic Digestion Thickening Storage Land Application

9 Solids Handling Prior to Project Aerobic Digestion Anaerobic Digestion Thickening Storage Land Application

10 Solids Handling after Expansion

11 Solids Handling Expansion

12 Solids Handling Expansion

13 Solids Handling Expansion

14 Why Egg Shaped Anaerobic Digester (ESD)? Process Footprint Cost (life cycle) - cleaning - efficiency Client comfort Ability to go to Class A

15 Why Egg Shaped Anaerobic Digester? Process Footprint Cost (life cycle) - cleaning - efficiency Client comfort Ability to go to Class A

16 Why Egg Shaped Anaerobic Digester? Process Footprint Cost (life cycle) - cleaning - efficiency Client comfort Ability to go to Class A

17 How the ESD Works:

18 How the ESD Works:

19 How the ESD Works:

20 How the ESD Works:

21 Combined Heat and Power Unit Dual Fuel (bio-gas and natural gas) kw using Bio-gas, kw using Nat Gas Internal exchangers to capture heat from engine cooling jacket and exhaust Efficiency of 86%

22 How do you go from a 183,000 gallon anaerobic digester to a 1 million gallon anaerobic digester?

23 What is Micro-Digestion?

24 Micro-Digestion Advantages Good Seed Sludge starts the process Complete Control Process Allowed to Acclimatize No loss of Bio-Mass Steady State Operation Quickly Alkalinity Builds Quickly Temperature Control

25 What do you need for startup? Identify Vessel Characteristics Starting Sludge Volume Initial Seed Volume at least 10% of Vessel Volume Feed based on 18 Days HRT of Vessel Volume Environmental Control

26 ESD Startup Challenges 90,000 gallons of seed sludge to start. 30,000 gallons Raw sludge Seed sludge screening Keeping Old Conventional Digester Operational Storing Seed Sludge Available Sludge Clean Secondary Digester

27 Secondary Digester Cleaning

28 Secondary Digester Cleaning

29 How to Prepare Seed Sludge?

30 Seed Sludge Collected 217,610 gallons of seed sludge over two weeks Seed Sludge was pumped over to the ESD in three days Stored Temp: 67F Volatile Acids: 353 mg/l Alkalinity 460 mg/l ph: 6.1

31 Mixing and Heating Mixing and Heating Startup Operating Temperature was reached in less than 24 hrs. from a start of 67F to 98F

32 Date Micro-Dig Vol. Depth (ft) HRT (days) Feed (gals) 8-Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar Mar

33 Lab Analysis on Raw Sludge and Digested Sludge Total Solids Volatile Solids Alkalinity ph Volatile Acids

34 (M-W-F) (M-W-F) (M-W-F) DATE ALK, mg/l ph V. Acids, mg/l Ratio 5-Mar Mar Mar Mar Mar Mar Mar Mar Mar 14-Mar Mar Mar Mar Mar Mar 20-Mar Mar 22-Mar Mar Mar 25-Mar 26-Mar

35 Operator Training Pumping, Valving, and Piping ESD Operating System New SCADA Emergency

36 Pumping, Valving, and Piping Which Valve Does What Mixing Piping and Valves Heating Piping and Valves DST Piping ESD Piping

37 Sludge Pumping Room

38 ESD Pipe Gallery

39 ESD Pipe Gallery

40 Heat Exchanger

41 Heating Water Loop

42 Gas Storage

43 ESD Operating System Familiarizing Operators Function Control Programing Alarms Problems

44 ESD Screen

45 Pump Screen

46 Schedule Screen

47 Emergency Foam Control Power Outages Gas Pressures Heating

48 Questions? Brian Hannon, P.E. Moore & Bruggink (616) Todd Wibright City of Grandville (616) x 1