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PRESTO Project workshop and International Forum “WASSER BER-LIN INTERNATIONAL” 23. – 26.04.2013, Berlin, Germany
Wastewater from meat production Prof. Dr.-Ing. Peter Hartwig
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Hannover Bremen Erfurt
Content • Legal Frame • In plant measures for the reduction of the wastewater quantity and load • Proved technologies for the treatment • Energetic use of the residues • Nitrogen removal
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BREF = Best available techniques Reference Document
• Detailed description of the production process • Definition of goals for the treatment as specific benchmarks • Basis for the legal requirements
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Hannover Bremen Erfurt
BREF recommendations for meat processing industry • Providing of storage capacities which are bigger than the usual requirement • Regularly measurement of the wastewater characteristic and documentation • Avoiding of a longer storage times without movement of the wastewater • Removal of particles (dry before wet cleaning) • Removal of grease • …
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BREF Standard values for wastewater from meat processing Parameter
Unit
Value
BOD5
mg/l
10 - 40
COD
mg/l
25 - 125
NH4-N
mg/l
10
Dry Solids
mg/l
5 - 60
Ntot
mg/l
15 - 40
P
mg/l
2-5
Lipophilic substances
mg/l
2,6 - 15
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German Wastewater Directive Requirements for the wastewater from meat processing (Enclosure No. 10, 2-hour-mixed sample or grab sample) Parameter
Unit
Value
BREF
BOD5
mg/l
25
10 - 40
COD
mg/l
110
25 - 125
NH4-N
mg/l
10
10
Ntot
mg/l
18
15 - 40
P
mg/l
2
2-5
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Specific wastewater Flotate Rheda (m3/pig) Rohabwassermengen B+C Tönnies Fleischwerke flow (m3/pig) spez. Flotatanfall, spez. Abwasseranfall, spez. ÜS SBR-Anfall surplus sludge 01.01.2004 bis 31.12.2004, werktags3 (m /pig) 0,350
0,070 spez. Abw asseranfall spez. Flotatanfall
0,060
spez. ÜS SBR-Anfall
0,250
0,050
0,200
0,040
0,150
0,030
0,100
0,020
0,050
0,010
0,000
0,000
8.
00
0
. 10
00
0
. 12
00
0
. 14
00
0
. 16
00
0
. 18
00
Anzahl Schweine gesamt
0
Number of pigs
. 20
00
0
. 22
00
0
. 24
00
0
spez. Flotatanfall, spez. ÜS SBR-Anfall [m³/Schwein]
spez. Abwasseranfall [m³/Schwein]
0,300
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Development of the raw water characteristic Entwicklung COD-concentration (mg/l) der Rohabwasserbelastung COD-load (kg/d)
12.000 10.000
50.000
Schlachteinheiten Number of pigs Abwasserkonzentration Concentration
45.000
Abwasserfracht Load
35.000
40.000
30.000
8.000
25.000 6.000
20.000 15.000
4.000
10.000 2.000
5.000
0
0 1998
1999
2001
2002
Year Jahr
2003
2004
2005
Abwasserfracht [kg CSB/d]
Schlachteinheiten [SE] Abwasserkonzentration [mg/l]
14.000
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Mechanical treatment - sievings Sieve to seperate feders
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Mechanical treatment Sand removal
Hydrocyclon
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Mechanical treatment – Sludge removal with Flotation (chem-phys.)
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Flocculator for the dosage of precipitants and polymers
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Flotation - sludge
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Flotation - effluent
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Biological treatment
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Example:
Hannover aqua consult Bremen Ingenieur GmbH Erfurt Wastewater treatmentment for Tönnies slaughterhouse Rheda-Wiedenbrück (capacity 30,000 pigs per day)
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Treatment steps • Pneumatic pumping station for pumping the wastewater directly to the municipal treatment plant (2,3 km) • Mechanical treatment (sieve, hydrolcyclone) • First biological treatment (nitrifikation, denitrification) • Final biological treatment together with the municipal wastewater • Flotate and surplus sludge are fed to a biogas plant (co-fermentation with the municipal sewage sludge)
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Flotation for slaughterhouse aqua consult wastewater Ingenieur GmbH 85 % COD and 65 % N-removal Flotation - Flotate used for biogas production -
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Pilot plant for anaerobic treatment aqua consult Ingenieur GmbH
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aqua consult Anaerobic reactors Ingenieur GmbH
Volume 4 x 80 l
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Digester for the co-fermentation under construction
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Co-fermentation of the flotate
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Components for the co-fermentation of flotate at the WWTP Rheda-Wiedenbrück Sludgewater treatment (PANDA)
CHP-plant 2,8 MWel
Anaerobic digester 5.000 m3 6.500 m3
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Combined heat power plants, 2 • 1,4 MWel
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Centrifuges (dewatered sludge, sludge water ≈ 2.500 mg NH4-N/l)
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Comparison of the nitrogen-removal over nitrate and over nitrite über Nitrat NH 4+
NO 2
-
autotroph
NO 3
-
N2
CSB/TKN: ~ 5,5
heterotroph
über Nitrit NH 4+
NO 2 autotroph
-
N2
heterotroph
CSB/TKN: ~ 3,6
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Growth rates of nitrosomonas and nitrobacter as a function of the temperature according HUNIK (1993)
aqua consult Ingenieur GmbH Kläranlage Rheda - Übersichtsbild
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Pilotplant for nitritation Rheda-Wiedenbrück
Pilotplant Nitritation – KA Dubai
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Nitritation T= 35 - 40 °C
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Growth rates of nitrosomonas and nitrobacter as a function of the temperature according HUNIK (1993)
Versuche Rheda
X
Versuche Dubai
X
y
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D2
N2 D1
Havarietank
N1
Storage
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Deammonification with Pellets, DEMON technology, WWTP Heidelberg
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Hydrozyklon
Pellets
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Co-fermentation of flotate from slaughterhouses
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Thermal Hydrolysis for hygienization
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