Navigation Links
New methods for better purification of wastewater
Date:3/5/2012

Before wastewater reaches recipient waters, nutrients must be removed in order to avoid eutrophication and large algal blooms, which may result in serious damage to animal and plant life. Robert Almstrand at the University of Gothenburg, Sweden, has shown in his thesis that better removal of nitrogen from wastewater can be achieved by providing the bacteria that purify the water with alternating high and low levels of nutrients.

The emission of wastewater to oceans, lakes and rivers contributes nutrients in the form of nitrogen and phosphorus to these recipients. This causes large algal blooms, and to prevent this the wastewater must be purified in wastewater treatment plants before being released.

The removal of nitrogen is a biological process in which different groups of bacteria are used to convert the nitrogen compounds to nitrogen gas in a number of steps. The nitrogen gas is then emitted to the atmosphere. The first, and rate-limiting step is nitrification. Nitrification is carried out by bacteria that oxidize ammonia via nitrite to nitrate ions.

Robert Almstrand at the Department of Chemistry and Molecular Biology shows in his thesis that the ability of the bacteria to carry out nitrification is improved if the bacteria receive alternating high and low levels of substrate (in the form of dissolved ammonium), rather than a constant low level. This will enable the wastewater treatment plant to cope better with variations in the concentration of nitrogen in the wastewater.

"Since the composition of the wastewater varies continuously, it was important to carry out the studies in a set-up that was as similar as possible to real wastewater treatment plants. For this reason we constructed a pilot plant at Ryaverket in Gothenburg", says Robert Almstrand.

The bacteria grew in what are known as "biofilms", which are dense collections of microorganisms on surfaces. Robert Almstrand used microscopy and digital image analysis to study how the bacterial colonies in the biofilms changed when exposed to different levels of nutrients.

"Different species of bacteria are promoted or inhibited to different extents by changes in their habitat", he says. "These properties are reflected in their positions in the biofilm, and so we developed new methods to analyse these in detail. The new methods are very flexible and can be used to analyse pretty much any type of biofilms."

Furthermore, Robert discovered that groups of bacteria that are normally considered to be the same species (Nitrosomonas oligotropha) were affected differently by the changes. It is, thus, important to understand the diversity within species of nitrifying bacteria, in order to improve the removal of nitrogen.


'/>"/>

Contact: Robert Almstrand
robert.almstrand@cmb.gu.se
46-317-862-569
University of Gothenburg
Source:Eurekalert

Related biology news :

1. New lab manual focuses on essential methods for purifying and characterizing proteins
2. Deep biosphere research points to new methods for recovering petroleum
3. Cold Spring Harbor Protocols features organ and cell culture methods
4. New manual presents robust, state-of-the-art proteomics methods for teaching and research
5. Methods for studying DNA repair and protein modification are featured in CSH Protocols
6. Cold Spring Harbor Protocols features stem cell differentiation, plant RNAi methods
7. Protein function and chromatin structure methods featured in Cold Spring Harbor Protocols
8. Protein analysis methods, viral vectors featured in Cold Spring Harbor Protocols
9. Scholar unconvinced new lie-detection methods better than old ones
10. K-State host to workshop on rapid methods to detect microorganisms in food
11. Infant formula adulteration with melamine underscores need for better detection methods
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/26/2020)... ... August 25, 2020 , ... ... targeting mitochondria, in partnership with Essex Bio-Technology, a bio-pharmaceutical company specializing in ... 3 VISTA-2 study of SkQ1 ophthalmic solution in patients with moderate to ...
(Date:8/26/2020)... ... ... Modality Solutions, a biopharmaceutical cold chain validation engineering firm, is ... is the most prestigious ranking of the nation’s fastest-growing private companies. Modality Solutions made ... three-year revenue growth of 71 percent. , The Inc. 5000 list represents a ...
(Date:8/21/2020)... ... August 18, 2020 , ... Sentien Biotechnologies, Inc., a ... U.S. Food and Drug Administration (FDA) has approved the company’s Investigational New Drug ... of severe COVID-19. Approval of this IND allows Sentien to initiate a Phase ...
Breaking Biology News(10 mins):
(Date:7/31/2020)... ... July 29, 2020 , ... Anomet Products ... three different materials for use with CRM, neurostimulation, vascular, and related devices. , ... meet specific design requirements, performance, and cost criteria; especially where solid wire is ...
(Date:7/31/2020)... (PRWEB) , ... July 29, 2020 , ... ... 200 of the top radiation centers in 16 countries, has reached its 20th ... SDX® is now in routine use at top universities including University of Pennsylvania, ...
(Date:7/18/2020)... ... July 16, 2020 , ... After research model surgery and catheter implantation, the ... is only the beginning of a successful study, while protecting and accessing the catheter ... Global Head of Surgery from Envigo in a live webinar ...
(Date:7/18/2020)... (PRWEB) , ... July 17, 2020 , ... ... global consulting firm for the life sciences and food industries, is pleased to ... Director of Clinical Research – Business Development. , Charles is an accomplished and ...
Breaking Biology Technology: