scholarly journals Nitrogen removal and nitrous oxide emission in surface flow constructed wetlands for treating sewage treatment plant effluent: Effect of C/N ratios

2017 ◽  
Vol 240 ◽  
pp. 157-164 ◽  
Author(s):  
Ming Li ◽  
Haiming Wu ◽  
Jian Zhang ◽  
Huu Hao Ngo ◽  
Wenshan Guo ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Surface Flow ◽  
Nitrous Oxide Emission ◽  
Surface Flow Constructed Wetlands

Township Sewage Artificial Wetland Depth Treatment Engineering Design

2012 ◽  
Vol 610-613 ◽  
pp. 2085-2089
Author(s):  
Jia Feng Xie ◽  
Yun Long Yang ◽  
Jian Li
Keyword(s):  
Engineering Design ◽  
Constructed Wetlands ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Surface Flow ◽  
Design Parameters ◽  
Design Characteristics ◽  
Tail Water

Applying surface flow constructed wetlands/subsurface flow constructed wetlands/UV disinfection compound constructed wetland treating sewage treatment plant tail water，introducing the technological process，engineering design parameters and equipment configuration，and summarizing the design characteristics. The operation results showed that the average removal rate of COD，NH3-N，TN and TP was 24.3%，36.8%，20.7% and 24.2% respectively，and The effluent can fully meet Standard A of the first class in GB18918-2002，“Standard for Discharge of Pollutants from Sewage Treatment Works in Towns and Cities”.

Effects of different covering systems and carbon nitrogen ratios on nitrogen removal in surface flow constructed wetlands

2018 ◽  
Vol 172 ◽  
pp. 541-551 ◽  
Author(s):  
Xiaowen Ding ◽  
Ying Xue ◽  
Yong Zhao ◽  
Weihua Xiao ◽  
Yuan Liu ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Surface Flow ◽  
Covering Systems ◽  
Surface Flow Constructed Wetlands

Enhanced nitrogen removal in trickling filter plants

2013 ◽  
Vol 67 (10) ◽  
pp. 2273-2280 ◽  
Author(s):  
Y. Dai ◽  
A. Constantinou ◽  
P. Griffiths
Keyword(s):  
Rural Communities ◽  
Nitrogen Removal ◽  
Pilot Trial ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Ammonium Concentration ◽  
Trickling Filter ◽  
Solids Retention ◽  
Plant Trial

The Beaudesert Sewage Treatment Plant (STP), originally built in 1966 and augmented in 1977, is a typical biological trickling filter (TF) STP comprising primary sedimentation tanks (PSTs), TFs and humus tanks. The plant, despite not originally being designed for nitrogen removal, has been consistently achieving over 60% total nitrogen reduction and low effluent ammonium concentration of less than 5 mg NH3-N/L. Through the return of a NO3−-rich stream from the humus tanks to the PSTs and maintaining an adequate sludge age within the PSTs, the current plant is achieving a substantial degree of denitrification. Further enhanced denitrification has been achieved by raising the recycle flows and maintaining an adequate solids retention time (SRT) within the PSTs. This paper describes the approach to operating a TF plant to achieve a high degree of nitrification and denitrification. The effectiveness of this approach is demonstrated through the pilot plant trial. The results from the pilot trial demonstrate a significant improvement in nitrogen removal performance whilst maximising the asset life of the existing infrastructure. This shows great potential as a retrofit option for small and rural communities with pre-existing TFs that require improvements in terms of nitrogen removal.

Upgrading of the Treatment Plants in Stockholm to Meet More Stringent Requirements

1990 ◽  
Vol 22 (7-8) ◽  
pp. 77-84
Author(s):  
J. Hultgren ◽  
L.-G. Reinius ◽  
M. Tendaj
Keyword(s):  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Design Flow ◽  
Limit Values ◽  
Mean Values ◽  
Reject Water ◽  
Low Phosphorus ◽  
Anoxic Zones

The purification requirements for the Stockholm sewage treatment plants will become more stringent in the future. The expected limit values for the effluent, expressed as annual mean values, are for BOD7, Tot-P, and Tot-N, 10, 0.3 and 15 mg/l respectively. If these contents are multiplied by the design flow values for the three plants, we obtain the maximum quantities which may be released. If the relevant authorities permit the municipality to distribute these total quantities as desired between the three plants, future necessary extensions can be optimized. The following main principles apply to an extension of the three plants: Loudden sewage treatment plant: This comparatively small treatment plant could, if the requirements are lower than in the other two plants, continue in operation with no other extensions than the inclusion of anoxic zones. It would, however, be necessary to refurbish the plant after a number of years of neglected maintenance. Bromma sewage treatment plant: The biological stage was extended during the 1982-84 period. For this reason, the municipality suggests that no further extensions of the aeration tanks be required, before 1995 at the earliest. A nitrogen removal with outgoing contents of Tot-N of 15-17 mg/l is expected to be achieved by measures taken to reduce the load on the biological stage instead. These measures consist of centrifuging the excess sludge and pumping it directly to the digesters instead of returning it to the inlet. Furthermore, separate treatment of the reject water from the sludge centrifuges is planned. A third measure could be changing over to a more efficient precipitation chemical to permit a further reduction of the load on the biological stage with regard to, inter alia, BOD7, Tot-N etc. To meet the requirements for phosphorus removal (0.3 mg/l), the plant will be extended with a filter stage after the existing biological stage. Henriksdal sewage treatment plant: At this plant, which is the largest of the three, the largest extensions are planned. To meet the requirements for nitrogen removal, the present volumes in the aeration tanks will be tripled and will be utilized as anoxic and aerated zones as required. Three new lines with aeration tanks and secondary sedimentation tanks will be constructed. The existing aeration tanks will also be deepened from 5 to 12 m. The requirements for low phosphorus contents in the effluent will be met by installing a filter stage, as in the Bromma plant.

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