Extension of a Large Trickling Filter Plant for Combined Nitrogen and Phosphorus Removal (Ejby Mølle Wastewater Treatment Plant, Odense, Denmark)

1991 ◽  
Vol 23 (4-6) ◽  
pp. 791-800 ◽  
Author(s):  
Knud Christensen
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Trickling Filter ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Trickling Filters ◽  
Future Extension ◽  
First Results ◽  
P Removal

Until 1985, one of the wastewater treatment plants in Odense, Denmark, was a traditional trickling filter plant designed for approx. 275,000 PE. To meet rigorous standards for N and P removal, the plant was extended in 1986-1988, and the extended plant was put into operation in April, 1989. Now, standards have been changed again and are : N < 8 mg/l and P < 0.5 mg/l. These standards must be complied, with before 1992. The establishing of design criteria based on statistical methods is presented. On the basis thereof, one of various extension alternatives was chosen. This involved keeping the existing primary settling tanks and performing partial nitrification in the existing trickling filters succeeded by a new structure for N and P removal according to the BIO-DENIPHO method. The future extension for contact filtration is mentioned. Basic civil engineering data are described together with design and operating economy. Furthermore, mention is made of the commissioning procedure and the first results.

Influence of Hydraulic Loading Rate on Horizontal Zeolite Wetland Effluent Quality

2012 ◽  
Vol 573-574 ◽  
pp. 659-662
Author(s):  
Hao Wang
Keyword(s):  
Wastewater Treatment ◽  
Loading Rate ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Hydraulic Loading Rate ◽  
Effluent Quality ◽  
Hydraulic Loading

In Tangshan area, the secondary effluent of wastewater treatment plants was used for this study. Horizontal zeolite wetland was carried out treating it. Hydraulic loading rate was the parameters for analyzing the nitrogen and phosphorus removal efficiency of pollutants from the secondary effluent of wastewater treatment plant. Zeolite constructed wetlands showed different behaviors for nitrogen and phosphorus removals.Under the optimum hydraulic loading rate, the primary pollutions were removed to a large extent.

Upgrading of a wastewater treatment plant utilizing existing trickling filters and a new filter stage

1994 ◽  
Vol 29 (12) ◽  
pp. 59-67
Author(s):  
M. Fruhen ◽  
W. Kühn ◽  
M. Dohmann
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Basic Function ◽  
Main Stream ◽  
Process Technology ◽  
Nitrogen And Phosphorus ◽  
Trickling Filters ◽  
Filtration Stage

The upgrading of wastewater treatment plants with the objective of enhancing the elimination of nitrogen and phosphorus is a demanding undertaking as regards the choice of process technology, especially if the basic function of existing treatment systems is to be retained. With reference to an existing two-stage biological sewage plant with trickling filters in the second stage, the present paper illustrates how the volume of the activated sludge stage that is being enlarged can be minimized by exploiting the benefits of a primary treatment stage with high BOD5 elimination and by integrating the trickling filters in the main stream of the treatment chain. This requires that the extremely costly filtration stage that is essential for eliminating the phosphorus also fulfils other tasks, in this case residual denitrification.

Using metazoa to reduce sludge production

1997 ◽  
Vol 36 (11) ◽  
pp. 171-179 ◽  
Author(s):  
J. H. Rensink ◽  
W. H. Rulkens
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Brewery Wastewater ◽  
Trickling Filters ◽  
Starting Point ◽  
Nitrification Process ◽  
Sludge Production

Pilot plant experiments have been carried out to study the mineralization of sludge from biological wastewater treatment plants by worms such as Tubificidae. Trickling filters filled with lava slags were continuously fed with a certain quantity of excess activated sludge of a Dutch brewery wastewater treatment plant (Bavaria) by recirculation during 10 to 14 days. At the starting point of each experiment the trickling filters were inoculated with Tubificidae. Recirculation of sludge showed that use of Tubificidae resulted in a COD reduction of the sludge (mixed liquor) of 18–67–. Without worms this reduction was substantially lower. The sludge production in a pilot activated sludge system for treating settled domestic wastewater reduced from 0.40 to 0.15 g MLSS/g COD removed when Tubificidae were added to the system. The lower amounts of sludge were always accompanied by an increase of nitrate and phosphate concentration in the wastewater. There was no disturbance of the nitrification process. Application of Tubificidae or other worms may have interesting potential for practical application.

Application of reversed A2/O process on removing nitrogen and phosphorus from municipal wastewater in China

2011 ◽  
Vol 63 (10) ◽  
pp. 2138-2142 ◽  
Author(s):  
X. S. Kang ◽  
C. Q. Liu ◽  
B. Zhang ◽  
X. J. Bi ◽  
F. Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Practical Application ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
New Process ◽  
Technical Features

The application of reversed A2/O process in practice in China is mainly discussed in this paper. As a new process on nitrogen and phosphorus removal, principle and technical features of reversed A2/O process are also summarized. The application in rebuilt wastewater treatment plant shows that reversed A2/O process not only has merits on high nitrogen and phosphorus removal efficiency, but also has merits on energy saving. The application in newly-build wastewater treatment plant shows that infrastructure and equipment investment of reversed A2/O process economized 15% and 10% respectively, compared to conventional A2/O process. The practical application shows that reversed A2/O process is a new nitrogen and phosphorus removal process, which is suitable for China's national conditions.

scholarly journals Activated Sludge Microbial Community and Treatment Performance of Wastewater Treatment Plants in Industrial and Municipal Zones

2020 ◽  
Vol 17 (2) ◽  
pp. 436 ◽  
Author(s):  
Yongkui Yang ◽  
Longfei Wang ◽  
Feng Xiang ◽  
Lin Zhao ◽  
Zhi Qiao
Keyword(s):  
Wastewater Treatment ◽  
Microbial Community ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Wastewater Sludge ◽  
Community Diversity ◽  
Nitrogen And Phosphorus ◽  
Metabolic Functions

Controlling wastewater pollution from centralized industrial zones is important for reducing overall water pollution. Microbial community structure and diversity can adversely affect wastewater treatment plant (WWTP) performance and stability. Therefore, we studied microbial structure, diversity, and metabolic functions in WWTPs that treat industrial or municipal wastewater. Sludge microbial community diversity and richness were the lowest for the industrial WWTPs, indicating that industrial influents inhibited bacterial growth. The sludge of industrial WWTP had low Nitrospira populations, indicating that influent composition affected nitrification and denitrification. The sludge of industrial WWTPs had high metabolic functions associated with xenobiotic and amino acid metabolism. Furthermore, bacterial richness was positively correlated with conventional pollutants (e.g., carbon, nitrogen, and phosphorus), but negatively correlated with total dissolved solids. This study was expected to provide a more comprehensive understanding of activated sludge microbial communities in full-scale industrial and municipal WWTPs.

scholarly journals Combining Unmanned Aircraft Systems and Image Processing for Wastewater Treatment Plant Asset Inspection

2020 ◽  
Vol 12 (9) ◽  
pp. 1461
Author(s):  
Jorge Sancho Martínez ◽  
Yadira Bajón Fernández ◽  
Paul Leinster ◽  
Mónica Rivas Casado
Keyword(s):  
Image Processing ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Trickling Filters ◽  
Aircraft Systems

Wastewater treatment plants are essential for preserving the water quality of freshwater and marine ecosystems. It is estimated that, in the UK, as much as 11 billion liters of wastewater are treated on a daily basis. Effective and efficient treatment of wastewater requires treatment plants to be maintained in good condition. Recent studies have highlighted the potential of unmanned aircraft systems (UASs) and image processing to be used in autonomous and automated monitoring systems. However, the combined use of UASs and image processing for wastewater treatment plant inspections has not yet been tested. This paper presents a novel image processing-UAS framework for the identification of failures in trickling filters and activated sludge facilities. The results show that the proposed framework has an accuracy of 95% in the detection of failures in activated sludge assets, with the accuracy ranging between 55% and 81% for trickling filters. These results are promising and they highlight the potential use of the technology for the inspection of wastewater treatment plants.

Upgrading of Wastewater Treatment Plants for the Reduction of Nitrogen and Phosphorus in Schleswig-Holstein, FRG

1990 ◽  
Vol 22 (7-8) ◽  
pp. 69-76
Author(s):  
C. F. Seyfried ◽  
E. Dammann
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Trickling Filter ◽  
The Baltic Sea ◽  
Nitrogen And Phosphorus ◽  
The North ◽  
The North Sea ◽  
Standard Values ◽  
The Baltic ◽  
Activated Sludge Processes

In order to solve the problems occurring in the North Sea and the Baltic Sea, programmes for the reduction of nutrients in wastewater treatment plants were initiated in the Schleswig-Holstein region. In 1988, all wastewater treatment plants with capacities greater than 17 000 population equivalents were upgraded for phosphate reduction, to give effluent concentrations of less than 2 mg P/l. By 1995, standard values of Ntot < 10 mg/l and P < 0.5 mg/l are expected. Designs for the expansion of several wastewater treatment plants are presented in this paper. In particular, the problems which result from seasonal peaks, high phosphorus concentrations, and the combination of trickling filter and activated sludge processes are discussed.

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