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:3/21/2016)... Unique technology combines v ... security   Xura, Inc. ... digital communications services, today announced it is working alongside ... customers, particularly those in the Financial Services Sector, the ... within a mobile app, alongside, and in combination with, ...
(Date:3/14/2016)... , March 14, 2016 NXTD ... growing mobile commerce market, announces the airing of a new ... starting the week of March 21 st .  The commercials ... including its popular Squawk on the Street show. --> ... on the growing mobile commerce market, announces the airing of ...
(Date:3/10/2016)... , March 10, 2016   Unisys Corporation (NYSE: ... Border Protection (CBP) is testing its biometric identity solution ... Diego to help identify certain non-U.S. citizens leaving ... The test, designed to help determine the efficiency and accuracy ... in February and will run until May 2016. --> ...
Breaking Biology News(10 mins):
(Date:5/23/2016)... OXFORD, England , May 23, 2016 ... Wednesday, May 25 th at 10:15 a.m. ET before ... about the role genetically engineered mosquitos can play in controlling ... known carrier of the Zika virus.      (Logo: ... genetically engineered male mosquito with a self-limiting gene. Trials in ...
(Date:5/23/2016)... Palo Alto, CA (PRWEB) , ... May 23, ... ... tank and public interest organization focused on molecular nanotechnology, announced the winners for ... honor of pioneer physicist Richard Feynman, are given in two categories, one for ...
(Date:5/20/2016)... ... 2016 , ... Kablooe Design, a leading provider of product design and development ... of the business. “We have worked hard to build long-term relationships,” says President and ... and honor of serving their product design and development needs through the years.” , ...
(Date:5/19/2016)... ... May 19, 2016 , ... Anton Paar USA, located in Ashland, Virginia is ... complete. The new structure adds a third office building to the current facilities. ... 2.4 acres of land, along with office space adjacent to the previous main building. ...
Breaking Biology Technology: