PHOSPHATE FERTILIZERS BASED ON MUNICIPAL SEWAGE SLUDGE ASHES AND BACTERIA

Transcription

1 TECHNOLOGY OF OBTAINING GRANULATED PHOSPHATE FERTILIZERS BASED ON MUNICIPAL SEWAGE SLUDGE ASHES AND BACTERIA BACILLUS MEGATERIUM MACIEJ ROLEWICZ, PIOTR RUSEK, KRZYSZTOF BOROWIK, NEW CHEMICAL SYNTHESES INSTITUTE IN PUŁ AWY, POLAND

2 THE WORLD S FERTILIZERS DEMAND The world s fertilizers demand in the years of (millions tones of the component) Compound N P 2 O K 2 O Total Phosphate rock is not a renewable raw material More fertilizers will be need in future

3 WHERE WE LOST THE PHOSPHORUS? municipal sewage industry sewage livestock's excrement phosphogypsum leaching from soil

4 BIO-FERT-P PROJECT The project aim is to develop new technology of phosphate fertilizers based on renewable raw materials and microbial solubilization bones or meat and bone meal ashes from incineration of sewage sludges Bacillus megaterium Product with fast and slow release of fertilizers nutrients Study in laboratory scale and pilot scale Obtaining parts of products for field experiments Field experiments for assessing properties of obtained product

5 BIO-FERT-P PROJECT CONSORTIUM Wrocław University of Technology New Chemical Syntheses Institute in Puławy University of Warmia and Mazury in Olsztyn

6 THE SCOPE OF WORK Verification of technology concept at pilot plant scale a kind of granulating agent an amount of granulating agent a selection of the phosphorus raw material mixture Obtaining the product for the field experiments Designing of installation Preliminary economic analysis

7 OBTAINING OF THE GRANULATED FERTILIZERS Grinding of the raw materials Adding the lyophilisate Mixing of the raw materials Granulation Drying Classification Granulating agent: dried blood Raw materials: Ash from incineration of municipal sewage sludge (MSSA)

8 QUALITY OF GRANULES Compressive strength min N Abrasion resistance > 99 % for best market products Granulating liquid consumption need to evaporate Efficiency Concetration of P 2 O 5 SSP 18 % DAP 46 % NPK %

9 RAW MATERIALS The composition of the raw materials Compound Unit MSSA P 2 O 5 % mass 24.7 Cd 1.23 Cr 140 Hg ppm 0.03 Ni 64 Pb 40 Concentration of metals are below the Polish fertilizers standards MSSA - municipal sewage sludge ash

10 A PILOT PLANT FOR FERTILIZER GRANULATION RESEARCH

11 A GRANULATION NODE

12 A GRANULATION NODE

13 A COMPACTOR

14 RESULTS PAN GRANULATOR Quality of obtained granules and consumption of granulating liquid Parameter Unit MSSA+ blood MSSA + blood + bacteria Compressive strength N Abrasion resistance % Consumption of granulating liquid % P 2 O 5 total % mass Efficiency % Long time of drying MSSA - municipal sewage sludge ash

15 RESULTS DRUM GRANULATOR Quality of obtained granules and consumption of granulating liquid Parameter Unit MSSA+ blood MSSA + blood + bacteria Compressive strength N Abrasion resistance % Consumption of granulating liquid % P 2 O 5 total % mass ,2 Efficiency % Long time of drying MSSA - municipal sewage sludge ash

16 INFLUENCE OF DRYING Two types of dryer Belt dryer Drum dryer Percent of active population of Bacillus megaterium 105 C 50% 80 C 90% 60 C 100%

17 RESULTS COMPACTOR Quality of obtained granules and consumption of granulating liquid Parameter Unit MSSA+ blood MSSA + blood + bacteria Compressive strength N Abrasion resistance % Consumption of granulating liquid % 6 6 P 2 O 5 total % mass ,1 Efficiency % High pressure decrease the population of bacteria MSSA - municipal sewage sludge ash

18 CONCLUSIONS Fertilizers obtained by plate granulation process are characterized by higher compressive strength and abrasion resistance comparing to fertilizers obtained by compaction and drum granulation. However, this is at the expense of decreased P 2 O 5 content in a product and significant water consumption during granulation process that generate the costs of drying process. Dryingintemperatureover80 C leadstodecreaseoftheactivepopulation of Bacillus megaterium in fertilizer.

19 ACKNOWLEDGEMENTS This project is financed in the framework of grant PBS 2/A1/11/2013 entitled: Phosphorus renewable raw materials - aresource base for new generation of fertilizers attributed by the National Center for Research and Development.