Important Elements for successful biogas projects. Steve Brewster

Transcription

1 Important Elements for successful biogas projects Steve Brewster Webinar - May

2 IDENTIFY DRIVERS Energy extraction Regulatory compliance Landfill Minimisation Green House Gas control Environmental 2

3 Parameter Design BVF Influent Removal efficiency Flow (m3/d) COD (mg/l) % BOD (mg/l) % TSS (mg/l) % TN (mg/l) 200

4 IDENTIFY PRODUCT PRIORITIES Biogas Fertilizer Biomass Water use it, sell it, upgrade it use it, sell it, dry it, sell for fertilizer when dried it stores well, packs well, light & transportable recycle, use as process water, wash water, further purification to potable water 4

5 Know your feedstock Feed characteristics determine plant process and design Volumes -Max and min Seasonality - e.g. Dairy, fruit waste, vineyards Variability - Many samples over time Analysis - water content, BOD, ph, consistency, temperature Inhibitory Factors - Disinfectants, antibiotics - Biological = pathogens, viruses Contamination - glass, plastic, wood, metal, sand & rocks Consider multiple feedstocks and sources - Source and feed - diversity is good Contract - Don t accept supplier s word on content, do due diligence on the supply and material 5

6 Dairy Breweries & Distilleries Food and Beverage Possible Feed Sources Agricultural & Horticultural Fisheries & Abattoirs Pharmaceutical and Chemical Pulp and Paper & other industries Municipal sorted wastes

7 SECURE YOUR FEEDSTOCK! Ensure the feed will be available as planned Contract it if possible to ensure it continues to match plant design Multiple feeds and sources ensures stability of operation. Set-up an analysis programme the feedstock suppliers need to comply with and document, to ensure the quality of the feed Plant success depends on the feedstock 7

8 Sydney 8

9 DEFINE THE PROCESS 9

10 Produce a Process & Instrumentation diagram and. 10

11 A scaled equipment layout plan as the basis for most of the subsequent detailed civil, electrical and hydraulic design 11

12 CNG powered busses Biogas fuelled Boiler CONSIDER DOWNSTREAM PRODUCTS Heat - Direct flame, boiler,dryer, steam Electricity IC engine, micro-turbine, sterling engine Clean water - Digestate requires further treatment and solids and dissolved components removed by membrane, RO etc Cooling (directly or indirectly, absorption chilling or electric compression) CNG (for pipeline reticulation or transport fuel) Other chemicals from biogas refining and reforming, plastics etc Carbon Dioxide - dry ice, drink aeration, greenhouse atmosphere CO2 enrichment 12

13 MONITOR YOUR PRODUCTS Regular analysis of products (digestate & Biogas) Document it to have a proof of quality 13

14 BIOGAS TREATMENT Upgrading: Scrubbing (H2S, SiOx, CO2, H2O) removal Transport Compressedto CNG in steel tanks for vehicles Measurement Rated by energy content; measure % methane

15 Biogas Treatment and Utilisation 15

16 NZ history Refuelling of an institute vehicle with biogas from the farm biogas digester around Invermay,16 Dunedin

17 Hidden & forgotten considerations Environmental - Resource consents & appeals= costs & delays - Does intended use match the permitted or specified use? Hazardous area survey - electrical requirement Gas regulations - Aus; state to state differences, Consider Pork industry code of practise. Electrical supply - Adequate for load? consider distance to Water supplies major loads - Quantity, Potable and process (recycled) water Site waste disposal, traffic volumes and control, noise, odours, discharges to air / water / soil, operational hours Benefits from larger scale operations 17

18 CONTRACT Possible contract services: Design, Design-build, Design build operate, After project completion services Financial model, payment timing, cash flow 18

19 CONTRACTS International considerations, local regs and laws regarding ownership & operations. Local custom, local labour Inducements Insurances Warranties 19

20 CONTRACTORS Model: Project manager or master contractor? Who provides what; Health and safety; who? Demarcation of responsibilities Electrical - competency, familiarity with gas sites Construction contractor. Competency, communications, cooperation with other trades, leadership 20

21 Parameter Design BVF Influent Flow (m3/d) COD (mg/l) BOD (mg/l) TSS (mg/l) TKN (mg/l) 81 BVF Effluent quality <

22 COMPONENTS Instruments - single vendor Equipment / process Packages clearly defined responsibility, - diagram. Confirm interface requirements Mechanical Equipment - define installation demarcation points and responsibilities. 22

23 SUPPLY LOGISTICS Getting stuff from wherever to the project site in timely fashion: Transportation method Storage & insurance Climatic considerations Cash flow Warranty time-outs Timing of orders and site arrival 23

24 Digester types Standard tank design Small footprint Accessible More expensive Parts usually remotely manufactured Considerable civil design & work required 24

25 Digester types In ground Inexpensive Simple to construct Mostly local materials & labour Liner & cover imported Requires large area 25

26 NZ expertise history The first full-scale plant undertaken by the company forbear in The former Fortex meatworks (Dunedin, New Zealand) Duffill Watts & King 26

27 In-Ground casava waste treatment. Approx 8 Megawatts combined Electricity and heat output

28 ADI-BVF - Dairy Plant Application Flow (m3/d) COD (mg/l) Biogas (m3/d) CH4 (%) BVF (ML) Additional treatment % 5.6 SBR 28

29 ADI-BVF - Dairy Plant Application Flow (m3/d) COD (mg/l) Biogas (m3/d) CH4 (%) BVF (ML) Additional treatment % 28 SBR 29

30 ADI-BVF - Dairy Plant Application Flow (m3/d) COD (mg/l) Biogas (m3/d) CH4 (%) BVF (ML) Additional treatment ,000 28,800 75% 39.3 SBR 30

31 Web: adisystemsinc.com Steve Brewster