Two stage Retention Soil Filter (RSF) - Universität Kassel · Univ.‐Prof. Dr.‐Ing. Franz‐Bernd Frechen Universität Kassel Federal winner Category „Society“ ... Filter

Int‘l Ecotech WorkshopAachen, 9.10.2014

Workshop“E h l i f“Ecotechnologies for treatment

of variable wastewater and stormwater flows”Aachen, 08/10 October 2014

Nutrients

Two stage Retention Soil Filter (RSF)Two‐stage Retention Soil Filter (RSF)

Univ.‐Prof. Dr.‐Ing. Franz‐Bernd FrechengUniversität Kassel

Federal winnerCategory „Society“

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e 1 Department of Sanitary and Environmental Engineering (DESEE)

Head: Prof. Dr.‐Ing. F.‐B. Frechenwww.uni‐kassel.de/fb14/siwawi

g y „ y

Int‘l Ecotech WorkshopAachen, 9.10.2014Research at DESEE 1994‐2011 on RSF

RSF F ld F ll (bi d il) 1994 1999 & 2002 2006 RSF Fulda‐Fellenweg (binder soil), 1994‐1999 & 2002‐2006 project „RSF in Hessia“: efficiency, design, impact on receiving

waterbody, hygiene, 2002 bis 2007 Scientific mentoring of full scale RSF’s Pilot scale lysimeter research Labor scale experiments

Follow up with focus on phosphorus and heavy metal removal 2009‐2011 (and pilot scale tests on two stage operation concerning P‐removal)

New project 2014‐2017: two stage technology, focus on P‐p j g gy,removal and emerging contaminants

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Int‘l Ecotech WorkshopAachen, 9.10.2014phosphorus elimination

Ph h li i ti d t tPhosphorus elimination needs two steps: Anionic adsorption to iron oxides and aluminium oxides present

in the soil matrix Precipitation and thus immobilization (iron‐, aluminium‐ or p ( ,

caciumphosphate)→ The phosphorus uptake capability is limited→ The phosphorus uptake capability is limited

removal of regenerative non regenerativeremoval of regenerative non regenerative

COD

l dSolids

Nitrogen

phosphorus

heavy metals

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y

Int‘l Ecotech WorkshopAachen, 9.10.2014filter material

S d 0/2 filt t i l Sand 0/2 mm as filter material Melioration with carbonate and iron/aluminium for P‐

immobilisation

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Int‘l Ecotech WorkshopAachen, 9.10.2014RBF Kleingladenbach KB: Melioration

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Int‘l Ecotech WorkshopAachen, 9.10.2014Results of 4 RSF over years

1002005 2006 2007 = σ

708090

100

%]

3040506070

PO4

[%

003

004

0102030η

P

20 20

03,5 / 14,5 / 12,4

11 / 19 / 196,6 / 26,7 / 44,3 7

/ 29 / 170,4 / 23,2 / 22,3 1

/ 23 / 197,0 / 12,4 / 3,6 17

/ 30 / 15melioratednot meliorated not meliorated

3,5 / 14,5 / 12,411 / 19 / 19

6,6 / 26,7 / 44,37 / 29 / 17

0,4 / 23,2 / 22,31 / 23 / 19

7,0 / 12,4 / 3,617 / 30 / 15compact soil

OE WB KB FW

Beschickungshöhe h FA [m]

melioratednot meliorated not meliorated compact soil

Loading rate [m/a]Beschickungshöhe h_FA [m] Anzahl Ereignisse n [-]

RBF-Anlage

Loading rate [m/a]Number events n [‐]

RSF

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Int‘l Ecotech WorkshopAachen, 9.10.2014Lifetime concerning P‐elimination

All il bl t KB li t d WB t li t d All available measurements; KB meliorated; WB not melioratedηPges _Kleingladenbach ηPges _Wiesenbach

90100

Linear (ηPges _Kleingladenbach) Linear (ηPges _Wiesenbach)

y = -0,006x + 84,32y = -0,025x + 93,81

708090

5060

s[%

]

3040

η Pge

s

1020

00 500 1000 1500 2000 2500

Betriebszeit [d]Duration of operation [d]

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Betriebszeit [d]Duration of operation [d]


All il bl t KB li t d WB t li t d All available measurements; KB meliorated; WB not meliorated

ηPges[%]

Lifetime melioratedRSF Kleingladenbach

[a]

Lifetime not melioratedRSF Wiesenbach

[a]

80 2 1.5

70 6.6 2.6

60 11.3 3.7

50 15.9 4.8

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All il bl t KB li t d WB t li t d All available measurements; KB meliorated; WB not meliorated

100%

90% melioriertmeliorated

li d

70%

80%

n %

nicht melioriertnot meliorated

60%

Pg

esin

40%

50%

30%0 5 10 15 20

Betriebszeit in JahrenDuration of operation [years]

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Int‘l Ecotech WorkshopAachen, 9.10.2014Drawbacks of meliorating the filter material

i d t hi h t f t i l i i d i t ll ti expensive due to high cost of material, mixing and installation If efficiency decreases, the complete filter material has to be

exchanged Very expensive RSF out of operation for minimum 1 ½ years

Filter material would also need to be exchanged at an existing Filter material would also need to be exchanged at an existing RSF that has not meliorated filter material, if new demandsconcerning effluent quality need higher P removal efficienciesconcerning effluent quality need higher P‐removal efficiencies

Thus, a process is needed that avoids the drawbacks mentioned Thus, a process is needed that avoids the drawbacks mentionedabove

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Int‘l Ecotech WorkshopAachen, 9.10.2014Research at DESEE 2009‐2011: 2nd stage (pilot scale)

2nd t fill d ith d b t 2nd stage, filled with adsorbents

Gravel from water treatmentGravel from water treatment

Wasserwerkskohle, Eisenregenerat, Ferrosorp RW,

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Wasserwerk Quenhorng

E. F. Hüttenservice Salzgitter HeGo Biotec Berlin

Int‘l Ecotech WorkshopAachen, 9.10.2014Test results of the pilot scale installation

Lysimeter 1 Lysimeter 2 Lysimeter 3 Lysimeter 4melioratednot meliorated nio meliorated not meliorated

90

100melioratednot meliorated nio meliorated not meliorated

70

80

such

such

such

such

50

60

es[%

]

rptio

nsve

rs

rptio

nsve

rs

rptio

nsve

rs

rptio

nsve

rs

30

40

η Pge

Des

or

Des

or

Des

or

Des

or

10

20

01 6 11 16 21 26 31 36 41 46 51 56 61 66

VersuchsnummerNumber of test

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Int‘l Ecotech WorkshopAachen, 9.10.2014Test results of the pilot scale installation – 2nd stage

WW-Kohle Eisenregenerat Ferrosorp

90

100

70

80

such

such

such

such

50

60

es[%

]

ptio

nsve

rs

ptio

nsve

rs

rptio

nsve

rs

ptio

nsve

rs

30

40

η Pge

Des

orp

Des

orp

Des

or

Des

or

10

20

01 6 11 16 21 26 31 36 41 46 51 56 61 66


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Int‘l Ecotech WorkshopAachen, 9.10.2014Technological advantages of a 2nd stage as adsorber

I t h l it i ll ffi i t t id In process technology, it is generally more efficient to provide specific reactors for specific processes rather than using one big

t “ i fit ll”reactor “one size fits all”

Influent for the 2nd stage is mechanically and biologically treated Influent for the 2 stage is mechanically and biologically treated wastewater without suspended solids instead of raw wastewater

In consequence, less competing reactions are expected

Also, a longer lifetime is expected

Thi i ht l l d t b tt ffi i f diff t ll t t This might also lead to better efficiency for different pollutants (phosphorus, heavy metals, micropollutants)

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Int‘l Ecotech WorkshopAachen, 9.10.2014New project on two/three stage RSF Korbach

N j t 2014 2017 t t t h l f P New project 2014‐2017: two stage technology, focus on P‐removal and emerging contaminants

CODsolids

diclofenaccarbamazepinesolids

ammoniaphosphorus

carbamazepineibuprofenmetoprololphosphorus

nickelcopper

metoprololsulfamethoxazolebenzotriazolecopper

zinc d i

benzotriazolediatrizoic acidi lcadmium

mercuryl d

iomeproliopromidei id llead iopamidoliohexol

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Int‘l Ecotech WorkshopAachen, 9.10.2014Overview RSF Korbach

influent

Flow-dividing with fine screen

to wwtp

RÜB 500

p

RÜB 500

manhole MW 15 overflowwith overflow weir

2nd stage (2nd/3rd stage)

RSF 2

effluent structurewith throttle valve

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Int‘l Ecotech WorkshopAachen, 9.10.2014Overview RSF Korbach – measurement start early 2015

oM IISP III

SP IV oM IV

S I

wwtp Flow-dividingwith fine screen

SP II Sorp I

MW15 receivingtank

oM I

RSF 2RÜB 500

SP I

oM IIISorp II

overflow

oM ISP I

SP V oM VKuhbachoverflowinfluent

Analyses at 5 Sampling Points (SP):CO SS O S S

5 online-measurements:Kuhbach

COD, SS, NH4-N, PGES, o-PO4-P at SP I – SP VSchwermetalle Cd, Cu, Pb, Ni, Zn, Hg at SP II – SP VMicropollutants at SP II – SP V

pH, redox, conductivity, temperature, O2-

concentration

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Int‘l Ecotech WorkshopAachen, 9.10.2014

Thanks for your attention !!attention !!

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Two stage Retention Soil Filter (RSF) - Universität Kassel · Univ.‐Prof. Dr.‐Ing. Franz‐Bernd Frechen Universität Kassel Federal winner Category „Society“ ... Filter