sludge liquor treatment - presto · prof. dr.-ing. ute austermann-haun, faculty of civil...

Prof. Dr.-Ing. Ute Austermann-Haun, Faculty of Civil Engineering, Institute for Sanitary Engineering

Sludge Liquor Treatment

PRESTO Project Seminar on Sustainable Sludge

Management and Laboratory Clinique

in Daugavpils and Kaunas on 23-25.10.2012

Prof. Dr.-Ing. Ute Austermann-Haun

Hochschule Ostwestfalen-Lippe

University of Applied Sciences

Faculty of Civil Engineering

Institute of Sanitary Engineering

Emilienstr. 45, 32756 Detmold – Germany

E-Mail: [email protected]


Sludge liquor

Sludge liquor arises when the sludge is

• thickened and dewatered

The highest concentrations of NH4 and P

are in the sludge liquor behind an anaerobic digester

2

Prof. Dr.-Ing. Ute Austermann-Haun, Faculty of Civil Engineering, Institute for Sanitary Engineering 3

Nitrogen balance of a WWTP

Input WWTP

11.0 g N/(E*d)

Recycle

~ 1.5 g N/(E*d)

So

urc

e: u

nkn

ow

n


Influence of sludge dewatering on

N concentrations in the effluent

4

Source: Fimml, Schlammwässer, Belastung, Behandlung. Abwasserverband Achental-Inntal-Zillertal

Daily hydrograph without

treatment of sludge liquor week 18/97

Number of pressings

Nu

mb

er

of

pre

ss

ing

s

Monday Tuesday Wednesday Thursday Friday Saturday Sunday


Possibilities of sludge liquor treatment

5

Chemical/physical Treatment Biological Treatment

Stripping of NH3 Nitrification / Denitrification

Katalytic oxidation of NH3 Nitritation / Denitritation

Precipitation of Struvite

(NH4MgPO4 · 6H2O)

Deammonification

Russian translation


Stripping – the process

1. Dosage of NaOH: NH4 NH3

2. Stripping of NH3

3. The NH3 rich gas is brought to a

second stripper into which H2SO4

is dosed

4. ammonium sulfate (NH4)2SO4

a fertilizer with a low pH

6

1. Space for russian translation


Stripping and acidic scrubber

7

So

urc

e: H

art

wig

, H

ave

rka

mp

, aqua c

on

su

lt In

g. G

mb

H, H

an

no

ve

r, G

erm

an

y

WWTP Straubing, WWTP Göttingen, Germany

NH3

Storage tank

sludge liquor

Heat exchanger Stripping

column

Blower Scrubber

column

Tank for

ammonia

sulphate

Tank for

hydrosulfuric

acid

Tank for lime-

milk (10 %)


Stripper (left) + scrubber (right)

8


Storage tanks for chemicals

9


Filling material for the stripper and

storage tank for the product

10

Co. EVIMAC

Co. Rauschert

Co. Hacketten


AirPrex system (MAP precipitation)

• WWTP with biological P removal has as well high

concentrations of PO4-P of 50 up to 200 mg/l

11

So

urc

e: P

ollu

tio

n C

on

tro

l S

erv

ice

Gm

bH

, H

am

bu

rg, G

erm

an

y

Anaerobic

digester

Mg precipitating agent

Sludge tank Air

stripping


Biological processes for sludge liquor

treatment

• Nitrification / Denitrification

• external C dosage

• 3,6 kWh/kg Neliminated

• Nitritation / Denitritation

• save of 40 % C dosage

• 2.5-3.0 kWh/kg Neliminated

12

Source of figures : Fimml, Schlammwässer, Belastung, Behandlung. Abwasserverband Achental-Inntal-Zillertal


Possibilities to inhibit nitrite oxidisers

NH4+ NO2

- Nitrosomonas ; NO2- NO3

- Nitrobacter

• oxygen limitation

• concentration of free NH3

• raising the pH

• intermittent aeration (~20 minutes on; ~20 minutes off)

13


Nitritation / Denitritation processes

with inhibition of nitrite oxidisers

• CANON (Completely Autotrophic Nitrogen removal Over

Nitrite), developed by TU Delft

• SNAP (Single stage Nitrogen removal using Anamox and

Partial Nitritation)

• OLAND (Oxygen Limited Autotrophic Nitrification-Denitrification

process), developed by TU Gent

• NIB (Nitritation im Intervallbelüfteten Biofilmsystem), developed

by ISAH, Ruhrverband, PURAC

14


Nitritation / Denitritation washout of

nitrite oxidisers

• NH4+ NO2

- Nitrosomonas µmax = 0.47 • 1.103(T-15) [d-1]

• NO2- NO3

- Nitrobacter µmax = 0.78 • 1.06(T-15) [d-1]

15 Sourc

e:

Rosenw

inkel, C

orn

eliu

s, T

höle

(2004)

htt

p:/

/ww

w.lanuv.

nrw

.de/w

asser/

ab

wasser/

fors

chung/p

df/

Abschlu

ssbericht

rate

fo

gro

wth

temperature [

C]


Nitritation / Denitritation processes

working with washout of nitrite oxidisers

• SHARON (Single reactor system of High Ammonium Removal

Over Nitrite), developed by TU Delft, grontmij

T = 30-40 °C, pH ≤ 7.2 reached by aeration

• PANDA (Partial Augmented Nitritation Denitritation with

Alcalinity), developed by ISAH, aqua consult

• SAT (Store And Treat), developed by Hamburg Wasser

16


Two-stage Panda process

17

external C source

acetic acid

Sludge liquor

blower station excess sludge excess sludge

Source: Hartwig, Gerdes, Schrewe (2010) aqua consult Ing. GmbH, Germany,

WWTP Rheda-Wiedenbrück

ƞN > 90 %


NH4-N within the Panda process

18

Sou

rce:

Ha

rtw

ig,

Ha

verk

am

p a

qu

a c

on

sult Ing

. G

mbH

, G

erm

an

y

sludge liquor treatment

influent

effluent N1

effluent N2

period of operation [week]


Biological processes for sludge liquor

treatment

• Deammonification

• no C dosage

• < 1.5 kWh/kg Neliminated

• less excess sludge

Special bacteria are used (Planktomyceten), slow growth > 11 d,

pH, NH3 and O2 have exactly to be regulated, intermittent

areation and 50 % NO2 + 50 % NH4 seem to be most effective.

19

Source of figure: Fimml, Schlammwässer, Belastung, Behandlung. Abwasserverband Achental-Inntal-Zillertal


Conclusions

• Anaerobic digesters conduct high concentrations of N (and P if

there is biological P elimination).

• Sludge liquor treatment reduces the load within a WWTP. It is

especially used when the activated sludge system is overloaded.

• A lot of physical-chemical and biological systems are developed

and already running in full scale plants.

20

Thank you for your attention!

Prof. Dr.-Ing. Ute Austermann-Haun

Hochschule Ostwestfalen-Lippe

University of Applied Sciences

Faculty of Civil Engineering

Institute of Sanitary Engineering

Emilienstr. 45, 32756 Detmold – Germany

E-Mail: [email protected]

Phone: 0049 5231 769 827

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