Development of biological nutrient removal technology in western Canada

2001 ◽  
Vol 28 (S1) ◽  
pp. 92-101 ◽  
Author(s):  
William K Oldham ◽  
Barry Rabinowitz
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Technology Development ◽  
Cold Climate ◽  
Biological Nutrient Removal ◽  
Western Canada ◽  
Removal Technology ◽  
Made In

Biological nutrient removal (BNR) technology for wastewater treatment was originally imported from South Africa in the early 1980s to protect the water quality of Okanagan Lake in central British Columbia from the effects of eutrophication. Since that time, more than 10 BNR plants have been built in western Canada, with capacities ranging from 2000 to 500 000 m3/d. As a result of the interaction among university researchers, plant designers, and plant operators, considerable progress has been made in refining the understanding of process and adapting the technology for cold climates. Consulting engineers from western Canada are now successfully competing in the international marketplace in the application of BNR technology in the U.S.A., the U.K., Europe, Asia, and Australia.Key words: wastewater treatment, western Canada, biological nutrient removal, nitrogen removal, phosphorus removal, cold climate, technology development.

Upgrading Wastewater Treatment Plants for Biological Nutrient Removal

1990 ◽  
Vol 22 (7-8) ◽  
pp. 53-60 ◽  
Author(s):  
B. Rabinowitz ◽  
T. D. Vassos ◽  
R. N. Dawson ◽  
W. K. Oldham
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Design Flow ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Conventional Activated Sludge ◽  
Recent Developments ◽  
Removal Technology ◽  
Biological Nitrogen

A brief review of recent developments in biological nitrogen and phosphorus removal technology is presented. Guidelines are outlined of how current understanding of these two removal mechanisms can be applied in the upgrading of existing wastewater treatment plants for biological nutrient removal. A case history dealing with the upgrading of the conventional activated sludge process located at Penticton, British Columbia, to a biological nutrient removal facility with a design flow of 18,200 m3/day (4.0 IMGD) is presented as a design example. Process components requiring major modification were the headworks, bioreactors and sludge handling facilities.

scholarly journals Comparison of nutrient solubilisation and dewatering by freeze/thaw processing of sludge from Biological Nutrient Removal (BNR) and Non-BNR wastewater treatment plants.

2017 ◽  
pp. 6.1-6.8
Author(s):  
Mahrooz Sabri ◽  
Nazim Cicek ◽  
Qiuyan Yuan
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Low Cost ◽  
Oxygen Demand ◽  
Solid Content ◽  
Cold Climate ◽  
Wastewater Sludge ◽  
Biological Nutrient Removal ◽  
Climate Conditions ◽  
Freeze Thaw

Natural freeze/thaw processing is a simple, practical and low-cost solid-liquid separation method, which can effectively dewater wastewater sludge in Northern Canadian communities located in cold climate conditions. This method is especially effective when used in small treatment plants in remote and cold regions as typical dewatering methods require complex and expensive equipment, skilled operators and special maintenance. The objective of this research was to evaluate freeze/thaw processing as a method for dewatering, nutrient solubilisation and organics separation of wastewater sludge originating from two different wastewater treatment facilities: a Biological Nutrient Removal (BNR) plant and non-BNR plant. The results of experiments showed the effectiveness of this method for sludge dewatering and solubilisation of organics and nutrients. The sludge solid content increased approximately 10-fold after freeze/thaw processing. The treatment solubilised 15.2%, 33.5% and 21.5% of the initial total nitrogen, total phosphorus and total chemical oxygen demand, respectively for the non-BNR sludge. These values were 6.3%, 80.0% and 16.5%, respectively for the BNR sludge. The released phosphorus and nitrogen in the water can be recovered and used as fertilizer for agricultural purposes, supporting northern food production.

Retrofit of biological nutrient removal process assisted by numerical simulation with activated sludge model no. 2

1996 ◽  
Vol 34 (1-2) ◽  
pp. 221-228 ◽  
Author(s):  
Gakuji Kurata ◽  
Kazushi Tsumura ◽  
Syoichiro Nakamura ◽  
Michio Kuwahara ◽  
Akio Sato ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Biological Nutrient Removal ◽  
Organic Substrates ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Removal Process ◽  
Biological Phosphorus

In existing wastewater treatment plants that employ biological nitrogen and phosphorus removal processes, a low concentration of organic substrates in the influent wastewater has a destabilizing effect on the phosphorus removal process. Many efforts have been made to combat this problem, including reconstructing the process flow and improving operation and control systems. However, because the mechanism used for biological phosphorus removal is complex, it is difficult to establish effective empirical methods. For this paper, we constructed a simulator for the wastewater treatment process and tried to improve on current procedures, focusing on the planning, execution, and evaluation of methods of retrofitting existing WWTP with equipment for biological nutrient removal. The Shinnanyo WWTP uses the anaerobic/aerobic activated sludge process to remove nitrogen and phosphorus biologically. At this plant, however, the influent wastwwater has an insufficient concentration of organic substrates, thus decreasing the efficiency of the biological phosphorus removal. An analysis of organic consumption in the reaction tank on the simulation suggested that injecting primary sludge into the reaction tank would increase the efficiency of phosphorus removal process. Full scale experiments conducted at the plant verified the efficiency of this method. In addition, by shortening the A-SRT, ensuring that nitrification is not negatively affected, the efficiency of the nitrogen and phosphorus removal was significantly improved.

Biological nutrient removal efficiency in treatment of saline wastewater

1999 ◽  
Vol 39 (6) ◽  
pp. 183-190 ◽  
Author(s):  
Nugul Intrasungkha ◽  
Jürg Keller ◽  
Linda L. Blackall
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Specific Effect ◽  
Biological Nutrient Removal ◽  
Biological Phosphorus Removal ◽  
Saline Wastewater ◽  
Nitrogen And Phosphorus ◽  
Salinity Levels ◽  
Seafood Processing

There is very little known about the effectiveness of wastewater treatment systems for saline wastewater generated by seafood processing industries, aquaculture and tourism activities. In particular, the effect of salinity on nitrogen and phosphorus removal in wastewater treatment processes is not well understood. Therefore we devised experiments to examine the treatment of highly saline wastewater, by using artificial seafood processing wastewater, for removal of nitrogen and phosphorus. Lab scale sequencing batch reactors (SBR) were initially operated at low, and then at increasing salt levels, to determine the overall effects of salinity on the nutrient removal performance. The microbial populations during these experiments were monitored to determine the specific effect of salinity on the various bacterial groups responsible for nutrient removal. The methods used were whole cell probing with fluorescently labelled RNA-directed oligonucleotide probes. Experimental data showed that the SBRs achieved good biological nutrient removal (BNR) when salinity levels in the influent were low (0.03% to 0.2% NaCl) but showed difficulties with biological phosphorus removal at salinity levels of 0.5%. It was found that there was a dominance of Gram-positive bacteria with a high mol% G+C in their DNA in the SBR treating wastewater with NaCl at 0.03% to 0.2%. The addition of acetate to improve BNR performance increased the proportion of bacteria from the beta Proteobacterial subclass.

Nutrient Removal in Small Wastewater Treatment Plants

1990 ◽  
Vol 22 (3-4) ◽  
pp. 211-216
Author(s):  
Niels Skov Olesen
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Ferrous Sulphate ◽  
Practical Solution ◽  
Sensitive Technique ◽  
Pumping Station ◽  
Denitrification Reactor

In some areas of Denmark nutrient removal is required even for very small wastewater plants, that is down to 500 pe (pe = person equivalents). The goal for the removal is 80% removal of nitrogen and 90% removal of phosphorus, or in terms of concentrations: 8 mg nitrogen/l and 1.2 mg phosphorus/l. The inlet concentrations are typically 40 mg N/l and 10 mg P/l. The paper presents the results from two such plants with a capacity of 800 pe. Phosphorus removal is made by simultaneous precipitation with ferrous sulphate. Nitrogen removal is carried out using the recirculation method. Both plants were originally rotor aerated oxidation ditches. They have been extended with a denitrification reactor and a recirculation pumping station. At present both plants have been in activity for about 3 years and with satisfactory results. Average concentrations of nitrogen (summer) and phosphorus is 7 mg/l and 0.9 mg/l respectively. Nitrogen removal seems to be a practical solution on these small plants. It is,though, sensitive to temperature and highly oxidized rain water. Phosphorus removal seems to be an easily run and relatively non-sensitive technique at least when using simultaneous precipitation.

Experience with nutrient removal in a fixed-film system at full-scale wastewater treatment plants

1997 ◽  
Vol 36 (1) ◽  
pp. 129-137 ◽  
Author(s):  
Vibeke R. Borregaard
Keyword(s):  
Wastewater Treatment ◽  
Surface Area ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
High Specific Surface Area ◽  
Biological Nutrient Removal ◽  
Growth Processes ◽  
Total N ◽  
Attached Growth ◽  
On Line

In the upgrade of wastewater treatment plants to include biological nutrient removal the space available is often a limiting facor. It may be difficult to use conventional suspended growth processes (i.e. activated sludge) owing to the relatively large surface area required for these processes. Recent years have therefore seen a revived interest in treatment technologies using various types of attached growth processes. The “new” attached growth processes, like the Biostyr process, utilise various kinds of manufactured media, e.g. polystyrene granules, which offer a high specific surface area, and are therefore very compact. The Biostyr plants allow a combination of nitrification-denitrification and filtration in one and the same unit. The results obtained are 8 mg total N/l and an SS content normally below 10 mg/l. The plants in Denmark which have been extended with a Biostyr unit have various levels of PLC control and on-line instrumentation.

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