2016 02-09 arreau eip water conf update cellulose
TRANSCRIPT
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Harvesting and valorization cellulose
from
municipal wastewater
EIP-Water ARREAU workshop Leeuwarden, 09-02-2016
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Harvesting cellulose
- Applying a finescreen
- several plants in operation in eg. Netherlands, Norway, Denmark, Poland and
Hungary.
- product is cellulose, contaminated with hair, organics, etc. to be upgraded
- From primary sludge
- In the development phase (not in operation);
- Objective is more or less clean cellulose
- From return activated sludge
- In the idea phase.
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Processing routes
incontinence pads and diapers
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WwTP Ulrum
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Preliminary results
05
• Capacity 80 m3/h (40 to 110 m3/h)
TSS 196 mg/l (30 to 625 mg/l)
Excess sludge average of 2 - 4 m3/h (1.3-2.7 g/l)
• Efficiency
• 62% of TSS (up 80%). - Without sludge
• 52% removal TSS + sludge (max. 92%)
• Dewatering without adding sludge:
• first dewatering 21% DS (max. 27%)
• second dewatering 39% DS (max. 53%)
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Preliminary results
06
• Dewatering with the addition of sludge: • first dewatering 8% SDS (max. 16%)
• second dewatering 15% DS (max. 23%)
• Dosage polyelectrolyte: • dosage of excess sludge> flocculation> conditioned
sludge> influent fine sieve
• range during tests 2,5 - 16 g active PE / kg DM
• optimum of 6-8 g PE / kg DM.
• Small scale tests • without the addition of cellulose: 20% DS
• with the addition of cellulose sludge (1: 1 on the basis of DS): 30%
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Project partners
07
This project is co-funded by “Samenwerkingsverband Noord Nederland, the Provinces of Drenthe, Fryslân and Groningen through a subsidy under “Pieken in de Delta, Koers Noord”.
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WwTP Beemster
Capacity: 170,000 ve DWF: 1,860 m3/h FFT: 3,600 m3/h Screenings 770 ton Ds/y
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Facts and figures
09
Under construction Start-up May 2016
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Small scale tests
10
Conclusions 1. Conversion of screenings to glucose using
enzymes is possible 2. The conversion of produced glucose to
lactic acid is comparable to use of standard sugars
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Project partners
011
The research phase of this project was co-funded by the “Rijksdienst voor Ondernemend Nederland (RVO), through a subsidy under the TKI-BBE.
The demonstration phase of this project is co-funded by the European commission, through a subsidy under the LIFE+.
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WwTP Aarle-Rixtel
• Construction started January 2016 • Start-up July, 2016
• Long-term research of impact of finescreens on downstream processes
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Project partners
013
This project is co-funded by the European commission, through a subsidy under the Eco-Innovation.
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Recovery of cellulose from screenings
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Project partners
015
The research phase of this project was co-funded by the “Samenwerkingsverband Noord Nederland and the Province of Groningen, through a subsidy under I.A.G-4.
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Flash pyrolysis of screenings
Production of
• Carbon;
• Oil
• Fatty acids
• Hydrogen gas
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Status valorization of cellulose
• Several research projects show that technically every hurdle can be taken;
• Some large scale demonstration projects are under construction but more appealing projects are required;
• Valorization of cellulose is still too much an activity of the water sector;
• The public perception of resources from raw sewage has to change – focus on social psychology;
•
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How should cellulose be offered to the market
• Technical - What should waterboard do or not do by itself;
• How to fit a variety of valorizing techniques in tender procedures;
• When is a technology sustainable and how do you value that?
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So far! Any questions?
“We cannot solve our problems with the same thinking we used when we created them”
- Albert Einstein -