Low temperature nutrient removal from municipal wastewater by purple phototrophic bacteria (PPB)

2019 ◽  
Vol 288 ◽  
pp. 121566 ◽  
Author(s):  
Peyman Dalaei ◽  
Dang Ho ◽  
George Nakhla ◽  
Domenico Santoro
Keyword(s):  
Low Temperature ◽  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Phototrophic Bacteria

Temperature effects on biological nutrient removal system with weak municipal wastewater

1998 ◽  
Vol 37 (9) ◽  
pp. 219-226 ◽  
Author(s):  
Choi Euiso ◽  
Rhu Daewhan ◽  
Yun Zuwhan ◽  
Lee Euisin
Keyword(s):  
Low Temperature ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Temperature Effects ◽  
Municipal Wastewater ◽  
Biological Nutrient Removal ◽  
Biological Phosphorus Removal ◽  
Removal Efficiencies ◽  
Biological Phosphorus ◽  
Operating Result

The wastewater characteristics of low organic strength coupled with low temperature would be considerable variables for design and operation of biological nutrient removal (BNR) systems. But temperature studies have mostly been focused on individual process with biological phosphorus removal, nitrification and denitrification, respectively. Overall temperature effects on BNR system may not be fully represented by sum of results of separated studies on biological nutrient removal steps. The operating result of a retrofitted full scale unit along with laboratory-scale BNR unit indicated 90% of nitrification was possible at temperature as low as 8°C. However, the denitrification was turned out to be a key step to regulate the overall nutrient removal efficiencies. When the operating temperature dropped down, a rapid decrease of phosphorus removal efficiencies was observed by the nitrate in return sludge. If nitrification was not well developed, phosphorus removal returned to the normal efficiency even at low temperature of 5°C. The phosphorus removal mechanism was not influenced at this low temperature.

Expenditure on the operation of municipal wastewater treatment plants for nutrient removal

2000 ◽  
Vol 41 (9) ◽  
pp. 281-289 ◽  
Author(s):  
O. Nowak
Keyword(s):  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
General Scheme ◽  
Operating Costs ◽  
Municipal Wastewater Treatment ◽  
Wastewater Purification ◽  
Labour Costs ◽  
Municipal Wastewater Treatment Plants ◽  
P Removal

Operating costs of Austrian municipal treatment plants are evaluated for 1989/90 and for 1997, respectively. The results indicate that presently the expenses which can be directly connected to wastewater purification, i.e. energy and chemicals for P removal, comprise only about 20% of the total operating costs. Today, in Austria like in other EU countries, the predominating factor is “labour costs”, even at nutrient removal plants. A general scheme for estimating operating costs is presented that can be applied to WWTPs in other parts of the world. In this scheme the important factors relevant to the operating costs are integrated.

First Proof of Concept for Full-Scale, Direct, Low-Temperature Anaerobic Treatment of Municipal Wastewater

2021 ◽  
pp. 125786
Author(s):  
Anna Christine Trego ◽  
B. Conall Holohan ◽  
Ciara Keating ◽  
Alison Graham ◽  
Sandra O'Connor ◽  
...  
Keyword(s):  
Low Temperature ◽  
Municipal Wastewater ◽  
Anaerobic Treatment ◽  
Full Scale ◽  
Proof Of Concept

Benchmarks for the energy demand of nutrient removal plants

2003 ◽  
Vol 47 (12) ◽  
pp. 125-132 ◽  
Author(s):  
O. Nowak
Keyword(s):  
Nutrient Removal ◽  
Energy Demand ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Electrical Energy ◽  
Anaerobic Sludge ◽  
Operational Experience ◽  
Municipal Wastewater Treatment ◽  
Sludge Digestion ◽  
Municipal Wastewater Treatment Plants

The energy demand of municipal wastewater treatment plants for nutrient removal equipped with primary clarifiers, activated sludge system, anaerobic sludge digestion, and CHP is evaluated theoretically, on the basis of COD balances. Operational experience from energy-efficient Austrian treatment plants confirms that the demand on external electrical energy can be kept as low as 5 to 10 kWh/(pe.a) depending on the N:COD ratio in the raw wastewater. A low N:COD ratio helps to keep not only the effluent nitrogen load low, but also the energy demand. Measures to minimise the energy demand at treatment plants and to reduce the nitrogen load are discussed.

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