Transcript 4th_sem_Vallin.ppt

-clean energy supply
for a sustainable society
Lina Vallin
David Kvick
Jörgen Ejlertsson
Anna Karlsson
Production site in
Linköping
• Production started in 1997.
• 54 000 tones of organic materials processed
annually.
• 50 000 tones of certified biofertilizer sold
annually on a regional market.
Total sales of 4,5 million Nm3 biogas (97 % CH4)
The biogas process
Substrates treated at the plant
Product
Amount
Share of total amount
tons
(%)
Slaughtery industry
28 300
75%
Food industry
5 800
15%
600
2%
Alcohol
1 200
3%
Manure
2 000
5%
Pharmaceutical industry
Biofertilizer
Provides routines for the production
plant in respect to get a valuable
and stable biofertilizer.
Insurance of quality for the farmer.
Confidence in the product for the
customers to the farmer e.g. food
processing industries.
Biogas in Sweden
• EU’s goal for 2020 means every fifth car.
• Great focus on market expansion with a
common goal of 100 filling stations before
2010 (34 st 2003  ~50 st 2004)
• Svensk Biogas filling stations 2005/2006
(13 in total):
• Linköping (4)
• Norrköping (1+1)
• Katrineholm
• Nyköping
• Mjölby
• Örebro
• Västervik (+1)
• Motala (+1)
Progress of the production
7 000 000
Total biogas production (Nm3)
6 000 000
5 000 000
4 000 000
3 000 000
2 000 000
1 000 000
0
1997
1998
1999
2000
2001
2002
2003
Gas production today: 155 Nm3/ton substrate
2004
Process development
•
Increased knowledge of the microbiological process in the
digester
•
Optimization of the process at the current production plant
in Linköping
•
New concepts for biogas production
Lab scale reactors
Mesophilic digestion, 37 degrees
Volume 3 L
Volumetric gas meters
Analysis of:
• substrates
• process parameters
• biofertilizer
Lab scale experiments
•
Addition of iron chloride and hydrochloric acid
•
Experimental plan:
– Controls (1a & 2a)
– Post-digestion of the control reactors (retention time 12.5 days)
– Reactors (3 & 4) with adjusting of pH (7.5 respectively 7.8)
•
Substrate: from the full scale plant.
Production of biogas (L/(day and 4Lreactor))
Results – gas production
16
14
12
10
8
6
4
2
0
-3
0
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
66
69
Day
♦ 1a normal
● 2b post-digestion pH 7.5
■ 1b post-digestion normal
x 3 pH 7.5
▲ 2a normal
+ 4 pH 7.8
Results – acid production
9000
8000
Acetate (mg/l)
7000
6000
5000
4000
3000
2000
1000
0
-6
-2
2
6
10
14
18
22
26
30
34
38
42
46
50
54
58
62
66
Day
♦ 1a normal
● 2b post-digestion pH 7.5
■ 1b post-digestion normal
x 3 pH 7.5
▲ 2a normal
+ 4 pH 7.8
0
2000-07-03
2000-06-13
2000-05-24
2000-05-04
2000-04-14
2000-03-25
2000-03-05
2000-02-14
2000-01-25
2000-01-05
1999-12-16
1999-11-26
1999-11-06
1999-10-17
1999-09-27
1999-09-07
1999-08-18
1999-07-29
1999-07-09
1999-06-19
Concentration of organic acids (mg acetate/L)
Amount of organic acids at the
Linköping biogas plant
32500
30000
27500
25000
22500
20000
17500
15000
Rk1
(mg/l)
12500
Rk2
(mg/l)
10000
7500
5000
2500
Conclusions
•
The experiment resulted in an increase of 30 % gas production when pH was
adjusted to 7.5 and 7.8.
•
The amount of organic acids were decreased by 50 %, which indicates a
stabilization of the process.
•
The product was implemented at the plant in Linköping with good results.
•
The composition of the product and the amount added must be optimized in
regard to the substrate fermented.
•
The product has been developed in cooperation with Kemira, and will soon be
available on the market.
•
The product has been patented by Tekniska Verken i Linköping AB (publ.).
Thank you for your attention!!
For further information:
Lina Vallin
[email protected]