Navigation Links
Researchers identify a simple way to precipitate phosphorus from the wastewater of a pulp mill
Date:11/21/2012

Researchers at Aalto University have developed a simple method for reducing the amount of phosphorus in the wastewater of a pulp mill. The method is called simultaneous precipitation using iron sulphate. A separate treatment stage is not required, as the precipitation takes place simultaneously with the actual biological wastewater treatment.

Iron sulphate is added to the wastewater prior to the biological wastewater treatment process, and the phosphorus dissolved into the water is precipitated with the biomass at the treatment plant. Finally, the phosphorus is removed from the plant with the sludge. In Finland, sludge is generally burned, in which case the phosphorus would end up in the ashes and would thus be reusable in the form of fertilizers, for example.

  • At best, the amount of phosphorus in the wastewater was reduced by more than 80 per cent, when the amount of iron fed into the process was 10 milligrams per litre,' commented researcher Sakari Toivakainen, who is currently preparing his doctoral dissertation.

Simultaneous precipitation creates savings in wastewater treatment costs

Public authorities are calling for the lowering of phosphorus emissions. For this reason, many factories have adopted an additional post-treatment precipitation stage, which is usually implemented using aluminium.

  • Post-treatment precipitation using aluminium produces difficult-to-process sludge. On the whole, simultaneous precipitation would seem to be a more advantageous option, Timo Laukkanen, Doctor of Science (Technology), concludes.

Simultaneous precipitation does not require additional wastewater treatment units, so there is no need for additional energy in the treatment of the water, either. An additional benefit of the method is that iron sulphate is an inexpensive chemical. A municipal wastewater treatment plant in Saint Petersburg constructed a few years ago employs simultaneous precipitation, among other methods. The industry, on the other hand, is only just waking up to the possibility of applying simultaneous precipitation. Wastewater from the forestry industry contains less phosphorus than municipal wastewater, so the dosage of the iron chemical remains within reasonable limits.

Experiments at the pulp mill

Initially, the research was carried out in the laboratories of Otaniemi and at the plant using pilot equipment. The results were so promising that, later on; iron precipitation was also successfully tested at the wastewater treatment section of a pulp mill.

  • From the viewpoint of comprehensive environmental protection and sustainable development, the best method is always the one that saves energy and minimises the amount of waste. With the help of the studied simultaneous precipitation method, it is possible to completely avoid additional stages of wastewater treatment, reduce the amount of solid waste and save energy. Simultaneous precipitation produces hundreds of thousands of euros worth of savings in operating costs, as energy consumption and the need for additional chemicals is reduced, Professor Olli Dahl crystallises.

The research has been published in the Water Science & Technology journal.


'/>"/>

Contact: Sakari Toivakainen
sakari.toivakainen@aalto.fi
Aalto University
Source:Eurekalert  

Related biology news :

1. Researchers decode birch tree genome sequence for the first time
2. Researchers develop guidebook for promoting healthy lifestyles among Hispanic populations
3. Researchers study links between conflict and fisheries in East Africa
4. A class of RNA molecules protects germ cells from damage, Penn vet researchers show
5. Researchers sequence swine genome, discover associations that may advance animal and human health
6. Researchers uncover some good news for BCs troubled salmon populations
7. Researchers use GPS tracking to monitor crab behavior
8. Researchers tap into CO2 storage potential of mine waste
9. Undersea gas leaks off Israels coast are discovered by University of Haifa researchers
10. Researchers discover 2 genetic flaws behind common form of inherited muscular dystrophy
11. Researchers to study impacts of pollutant nitrogen on plant species diversity
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers identify a simple way to precipitate phosphorus from the wastewater of a pulp mill
(Date:5/23/2017)... , May 23, 2017  Hunova, the first robotic gym for the ... been officially launched in Genoa, Italy . The first ... and the USA . The technology was developed ... market by the IIT spin-off Movendo Technology thanks to a 10 million ... News Release, please click: ...
(Date:5/16/2017)... , May 16, 2017   Bridge Patient ... organizations, and MD EMR Systems , an ... partner for GE, have established a partnership to ... product and the GE Centricity™ products, including Centricity ... These new integrations will allow ...
(Date:4/24/2017)... 24, 2017 Janice Kephart , ... Identity Strategy Partners, LLP (IdSP) , today issues ... President Trump,s March 6, 2017 Executive Order: ... vetting can be instilled with greater confidence, enabling ... all refugee applications are suspended by until at ...
Breaking Biology News(10 mins):
(Date:10/7/2017)... , ... October 06, 2017 ... ... experience providing advanced instruments and applications consulting for microscopy and surface analysis, ... in application consulting, Nanoscience Analytical offers a broad range of contract analysis ...
(Date:10/7/2017)... Oct. 6, 2017  The 2017 Nobel Prize ... scientists, Jacques Dubochet, Joachim Frank and ... cryo-electron microscopy (cryo-EM) have helped to ... structural biology community. The winners worked with systems ... routinely produce highly resolved, three-dimensional images of protein ...
(Date:10/6/2017)... ... October 06, 2017 , ... On Tuesday, ... webinar on INSIGhT, the first-ever adaptive clinical trial for glioblastoma (GBM). The featured ... event is free and open to the public, but registration is required. , ...
(Date:10/5/2017)... (PRWEB) , ... October 05, 2017 , ... Understanding the ... newest frontiers in human health. Gut Love: You Are My Future, the newest exhibit ... artist’s perspective as it explores the human condition through the lens of the gut ...
Breaking Biology Technology: