innovative recovery waste sludgeмон.бг/upload/10542/22may2014_3_ribarova.pdf · bu irina...

Innovative P‐recovery from waste sludge

Collaborative aspects and main results

Presented by: Assoc. Prof. Irina Ribarova, UACEG, Sofia, BulgariaAssoc. Prof. Hussein Jemendjiev, BU, Bulgaria

Structure of the presentation

1. Project overview

2. Collaborative aspects

3. Brief overview of the research results

BSRP midterm meeting 22 May 2014 Sofia

1. Project overview


The importance of the phosphorus recovery

• Irreplaceable natural resource;• It disappears from the food chain as

animal manure, human excreta and organic waste;

• Largest part mining phosphate rock are located in Morocco, the US and China. In Europe hardly any raw phosphorus is available, except for a very small quantity in Finland. Increasing prices

• Closing cycles of matters is an important measure towards higher independence and better sustainability.


The concepts of the project


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

WP2 ‐ Seawater treatment

WP3 ‐ Sludge desintegration

WP7 ‐ Dissemination

WP4 ‐ Metal separation

WP5 ‐ MAP crystallization, lab and bench scale

WP6 ‐ Technology evaluation

WP / Actionproject month

Duration (entire project) Duration of entire project

WP1 ‐ Quantification 1

5

2

3 4

9

8

7

6

Timeline


2. Collaborative aspects


Partners


Partners together


Project structure – responsible partners

UACEG

FHNW

BU

Irina RibarovaRalitsa LambevaSonya Dimitrova

Valentin NenovBogdan BonevHussein JemendjievGergana Peeva

Thomas WintgensClaudia NiewerschKirsten Remmen

WP 1

WP 2

WP 4

WP 5

WP 3

WP 6

WP 7

WP6 – Technology evaluationWP7 ‐ Dissemination


Collaborations: Project meetings (3 hold, 1 forthcoming) and Exchange visit


Sofia, February 2013, January 2014

Burgas, July 2014

BaselJuly 2013

Exchange: Basel to Burgas (2 researchers, 10 days, July 2013)

Other collaborations


BaselBasel

Basel

Sofia

Burgas

Summary of the collaborative activities

• Mutual learning ‐ exchange of knowledge and ideas, discussions for overcoming of the difficulties;

• Better planning of the research needs and steps by joint efforts;

• Sharing of techniques and research methods;• Sharing of laboratories – overcoming the need to equip every laboratory


Next collaboration steps

• Already approved International Exploratory Workshops (will be financed by the Swiss National Science Foundation)

• 24‐26 November 2014 in Basel

• The topic: “Phosphorus recovery technologies: from labs to practice”


3. Brief overview of the main research results


City (above 10 000 pe) PE P‐removal Stabilization Dewatering

Sofia 1 291 054 ch/bio digestor belt filterpressBurgas 170 792 ch/bio anaerobic open centrifugesMeden Rudnik 43 757 ch ext aeration centrifugesKustendil 48 052 ch/bio aerobic stabilisation drying beds/centrSamokov 26 591 n.n. ext aeration chamber filter pressGorna Orjahovitsa 43 834 ch/bio digestor belt filter pressDimitrovgrad 38 677 ch digestor belt filter pressRuse 149 294 ch/bio digestor belt filter pressSevlievo 23 390 ch aerobic stabilisation belt filter pressSliven 92 530 ch/bio digestor mechanicalStara Zagora 172 492 ch/bio deigestor mechanicalTrojan 22 225 ch/bio ext aeration belt filter pressHaskovo 89 812 n.n. ext aeration belt filter press


WP1 Selected WWTPs

WP2 Sewater treatment


Goal: Process combination of nanofiltration and reverse osmosis for treatment of solar seawater

evaporation concentrate

Task 2.1: Membrane screening (FHNW)

Task 2.2: Filtration experiments (FHNW)

6 M 12 M 18 M

WP 2 M 1‐8

WP 3 Sludge disintegration


Goal: Provoke an increased release of phosphorus from the sludge into the liquid phase

Task 3.1: Phosphate dissolution from sludge by

applying solution of high salinity (FHNW)

Task 3.2: Lab scale Studies on electrochemical

dissolution of orthophosphates from ferric phosphate (BU)

Task 3.3: Lab scale Studies on acidic dissolution of

phosphate from sludge (FHNW )

6 M 12 M 18 M

Task 3.1 M 6 ‐12

Tasks 3.2 and 3.3 M 4 ‐12










6 M 12 M 18 M

Task 3.1 M 6 ‐12

Tasks 3.2 and 3.3 M 4 ‐12

o-PO4 concentration in the MFC (blue) and control sample (red) vs. Time

0102030405060708090

0 24 48 72 96 120 144 168 192

Time, Hours

o-P

O4

conc

entr

atio

n, m

g/l










6 M 12 M 18 M

Task 3.1 M 6 ‐12

Tasks 3.2 and 3.3 M 4 ‐12

WP4 Metal separation


Goal: Low phosphorus loss and an effective purification

Task: Lab scale studies on metal separation with nanofiltration optimize operational parameters (FHNW)

6 M 12 M 18 M

WP 4 M 8‐16

WP‐5 MAP crystallization, lab and bench scale

Meeting 22 April 2014

Goal: To develop innovative and environment friendly methods of struvite precipitation

Task 5.1: Lab scale studies on the application of low cost natural seawater concentrate

Task 5.2:Studies of agglomeration of struvite crystals

Task 5.3.1: Studies on non-reagent pH elevation by electrochemical processes (MFC)

Task 5.3.2: Studies on non-reagent pH elevation by air-stripping

Task 5.4 :Design of demo prototype

Task 5.5: On site bench scale studies











71,4

95,792,8 95,7

020406080

100120

Contr

ol pro

be

Chito

san (0

,5 mg

/l)

Chito

san (1

mg/l

)

Chito

san (2

mg/l

)

Pecti

n (0,5

mg/l

)

Pecti

n (1 m

g/l)

Pecti

n (2 m

g/l)

Gelat

ine (0

,5 mg

/l)

Gelat

ine (1

mg/

l)

Gelat

ine (2

mg/

l)Ag

ar (0,

5 mg/l

)

Agar

(1 mg

/l)

Agar

(2 mg

/l)

Zeolit

e (0,5

mg/l

)

Zeoli

te (1

mg/l)

Zeoli

te (2

mg/l)

Phos

phate pr

ecipitation rate

, % 0,96 0,990,825

0,972 0,99

00,2

0,40,60,8

11,2

Chito

san (0

,5 mg

/l)

Chito

san (1

mg/l

)

Chito

san (2

mg/l

)

Pecti

n (0,5

mg/l

)

Pecti

n (1 m

g/l)

Pecti

n (2 m

g/l)

Gelat

ine (0

,5 m

g/l)

Gelat

ine (1

mg/l

)

Gelat

ine (2

mg/l

)Ag

ar (0,

5 mg/

l)

Agar

(1 m

g/l)

Agar

(2 m

g/l)

Zeoli

te (0,

5 mg/l

)

Zeoli

te (1

mg/l)

Zeoli

te (2

mg/l)

Sedimen

tation

rate, m

/s









Task 5.5: On site bench scale studies 1200 mV

6

7

8

9

10

11

0 24 48 72 96 120

Time, hours

pH










7,5

98,9

7

7,5

8

8,5

9

‐50 50 150 250

time, minpH

100 h‐1 200 h‐1 300 h‐1









Task 5.4 :Design of demo prototype IN PROGRESS…………..

Task 5.5: On site bench scale studies IN PROGRESS…………..


MAP CHARACTERIZATION

Thermo-gravimetric analysis

X-ray diffractometry

Microscopic observation


Microscopic pictures of the struvite from the in the experimental work


First year results (1)

• Two innovative processes for phosphorus extraction: 1) Sludge disintegration by high osmotic salt solution and 2) Bio‐electrochemical, non‐reagent dissolution of ferric phosphate by application of Microbial Fuel Cells;

• An innovative configuration of nanofiltration for the purification of phosphorus and removal of heavy metals;

• Several innovative aspects regarding the crystallisation of struvite as fertiliser product;

• Precipitation initiation by air stripping, agglomeration by addition of natural coagulants and flocculants and non‐reagent pH elevation using microbial fuel cells.


First year results (2)

• Identification of synergies and improvement of process efficiency. Different experimental studies about the application of seawater or seawater concentrate as magnesium or salt source.

• The identification of types of waste acids suitable for an application for the acidic extraction of phosphorus from the

• Link to the real conditions given in the WWTPs. A comprehensive study on an assessment of mass flows, loads and concentrations in Bulgarian WWTPs


• Master thesis (Kirsten Remmen): finished 09/2013

• Master thesis (Georgi Kirov): finished 02/2014

• Master thesis (Ralitsa Lambeva): to be finished in 07/2015

• Master thesis (Therese Schütte): finished 05/2014

• PhD work of Gergana Peeva: to be finished in May 2015

• Annual Report: finished 03/2014

Activities in implementation of WP7

• Journal publication about sludge disintegration with salt solutions (WP3.1) FHNW: status: draft available

• Journal publication about nanofiltration (WP4): FHNW: status: draft available


Research Output


Acknowledgement


Highly acknowledged is the funding of the “INNOVA P‐recovery” project (No. IZEBZO_143004/1) by the Bulgarian‐Swiss Research Programme.

Thank you for your attention


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