Installation of a bioelectrochemical system as a pre-cleaner in a constructed wetland with higher pollutant loading under continuous mode

2020 ◽  
Vol 6 (12) ◽  
pp. 3326-3340
Author(s):  
Manoj Kumar ◽  
Rajesh Singh
Keyword(s):  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Vertical Flow ◽  
Continuous Mode ◽  
Bioelectrochemical System ◽  
Two Phase ◽  
Pollutant Loading ◽  
Vertical Flow Constructed Wetlands

In this study, two-phase continuous vertical flow constructed wetlands were installed with a pre-cleaner bioelectrochemical system for the removal of NH4+-N (60.41–85.78%), NO3−-N (25.55–35.18%), TN (57.80–84.65%), TKN (37.24–70.08%), PO43−-P (38.89–63.40%), SO42− (49.53–76.06%), and COD (25.83–74.70%) from municipal wastewater.

Correlation Studies of Dissolved Oxygen in the IVCW System Changes and Removal of Nitrogen

2012 ◽  
Vol 610-613 ◽  
pp. 417-421
Author(s):  
Ji Ku Zhang ◽  
Yue Lang ◽  
Ming Jie Li
Keyword(s):  
Dissolved Oxygen ◽  
Constructed Wetlands ◽  
Total Nitrogen ◽  
Constructed Wetland ◽  
Flow Direction ◽  
Vertical Flow ◽  
Correlation Studies ◽  
Vertical Flow Constructed Wetlands ◽  
Vertical Flow Constructed Wetland ◽  
System Changes

Experiment simulates the integrated vertical flow constructed wetland (IVCW) operation of the system, discusses the trend of Dissolved Oxygen (DO) within the system and the relativity of DO and removing nitrogen. The results show that NH4+-N, NO3—-N and DO decrease along the flow direction in the integrated vertical flow constructed wetlands; NO3—-N increased and then decreased along the process; because of the DO of upstream pool is low, so the Total Nitrogen (TN) removing process occurs mainly in the downstream pool.

Reversing Clogging in Vertical-Flow Constructed Wetlands by Backwashing Treatment

2010 ◽  
Vol 129-131 ◽  
pp. 1064-1068
Author(s):  
Fei Ma ◽  
Li Jiang ◽  
Ting Zeng
Keyword(s):  
Waste Water ◽  
Hydraulic Conductivity ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Removal Rate ◽  
Pollutant Removal ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands ◽  
The World ◽  
Design Guidance

More and more constructed wetland CW) were used to treat waste water in the world for its advantage on cheaper and efficiency. CW would clog for improper design or imperfect management, so application for it was limited. The purpose of this paper is that using backwashing method resolve filter media clogging problem which is an intractable matter in constructed wetlands project. The effects of the backwashing treatment on pollutant removal, as well as the influence on characteristics of hydraulics of wetlands, were studied. The experimental results indicate that CW hydraulic conductivity, hydraulic resistance time and removal rate of COD increased after backwashing. This paper confirmed that backwashing method can reverse clogging in vertical-flow constructed wetlands, and provided design guidance for applying backwashing method to treat clogging vertical-flow constructed wetlands.

scholarly journals Effectiveness of septage pre-treatment in vertical flow constructed wetlands

2017 ◽  
Vol 76 (9) ◽  
pp. 2544-2553 ◽  
Author(s):  
Beata Karolinczak ◽  
Wojciech Dąbrowski
Keyword(s):  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Vegetation Period ◽  
Ammonia Nitrogen ◽  
Vertical Flow ◽  
Municipal Wastewater Treatment ◽  
Vertical Flow Constructed Wetlands ◽  
Hydraulic Load ◽  
Pre Treatment

Abstract Septage is wastewater stored temporarily in cesspools. A periodic supply of its significant quantities to small municipal wastewater treatment plants (WWTPs) may cause many operational problems. In the frame of the research, it has been proposed to utilize vertical flow constructed wetlands for pre-treatment of septage prior to its input to the biological stage of a WWTP. The aim of the work was to assess the effectiveness of pre-treatment in relation to factors such as: seasonality, hydraulic load, pollutants load of the VF bed and interactions between these factors. The results proved that application of a VF bed to septage pre-treatment can significantly reduce the concentration of pollutants (biochemical oxygen demand (BOD5): 82%, chemical oxygen demand (COD): 82%, total suspended solids (TSS): 91%, total nitrogen (TN): 47%, ammonia nitrogen (NH4-N): 70%), and thus decrease the loading of the biological stage of a WWTP. The mathematical models of mass removal process were created. They indicate that in case of all analysed parameters, removed load goes up with the increase of load in the influent. However, with the increase of hydraulic load, a decrease of the removed BOD5, COD, TSS and total phosphorus, and in vegetation period an increase of TN, can be observed in terms of load. There are no statistically significant effects of seasonality.

scholarly journals Performance Assessment of the Vertical Flow Constructed Wetlands Treating Effluent from the UASB Reactor – A Demonstration in a Tropical Climatic Region

2019 ◽  
Vol 8 (4) ◽  
pp. 9779-9781
Keyword(s):  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Cost Effective ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Vertical Flow ◽  
Climatic Regions ◽  
Vertical Flow Constructed Wetlands ◽  
Anaerobic Sludge Blanket ◽  
Treating Effluent

This paper presents the performance of the vertical flow constructed wetlands (VF-CWs) that has been investigated at a demonstration-scale level for the treatment of effluent from the anaerobic digestor (up-flow anaerobic sludge blanket) for municipal wastewater. The area of the bed is 480m2 with a depth of 1.0m, having dual media. The macrophytes (vegetation) used in the VF-CWs is phragmites australis. The performance efficiency of the system was measured for different parameters like BOD, COD, TSS, TKN, and TC. The result indicates that the combination of UASB & VF-CWs offers a very promising way to deal with the municipal wastewater within cost-effective and sustainable approaches, particularly in the developing countries in a tropical climatic regions. The overall removal efficiency from UASB and VFCW for COD, BOD, TSS, TKN is 80.8%, 91%, 88.23% and 92.25% respectively. The total coliforms removal has been observed from 1E+06 to 1E+04 CFU/100ml

Study on Biofortification in Vertical Flow Constructed Wetland

2014 ◽  
Vol 955-959 ◽  
pp. 2570-2573
Author(s):  
Ji Ku Zhang ◽  
Hui Ting Shao ◽  
Yue Ming ◽  
Hui Ye Wang
Keyword(s):  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Loading Rate ◽  
Removal Rate ◽  
Nitrifying Bacteria ◽  
Vertical Flow ◽  
Microbial Inoculants ◽  
Vertical Flow Constructed Wetlands ◽  
Technology And Economy ◽  
Number Of Bacteria

The methods of dosing composite microbial inoculants are used in vertical flow constructed wetlands for biofortification. The removal of the main pollution indicators by substrate microorganisms was studied. The results show that compared with the blank system, the number of bacteria and nitrifying bacteria was higher in the substrate of constructed wetland by biofortification. At the hydraulic loading rate (HLR) of about 0.8 m3/(m2·d), relationship between total number of bacteria and the removal rate of COD was significant in Device A and Device B. Relationship with TP removal rate is not evident. Correlation between the number of nitrifying bacteria and TN removal rate was obvious. The biofortification is feasible on technology and economy.

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