pH, redox, and oxygen microprofiles in rhizosphere of bulrush (Scirpus validus) in a constructed wetland treating municipal wastewater

2004 ◽  
Vol 88 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Achintya N. Bezbaruah ◽  
Tian C. Zhang
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Scirpus Validus ◽  
Oxygen Microprofiles

Municipal wastewater treatment with pond–constructed wetland system: a case study

2005 ◽  
Vol 51 (12) ◽  
pp. 325-329 ◽  
Author(s):  
X. Wang ◽  
X. Bai ◽  
J. Qiu ◽  
B. Wang
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Oxidation Pond ◽  
System A ◽  
Treated Effluent ◽  
Wetland System ◽  
Oxidation Ponds ◽  
Better Than

The performance of a pond–constructed wetland system in the treatment of municipal wastewater in Kiaochow city was studied; and comparison with oxidation ponds system was conducted. In the post-constructed wetland, the removal of COD, TN and TP is 24%, 58.5% and 24.8% respectively. The treated effluent from the constructed wetland can meet the Chinese National Agricultural and Irrigation Standard. The comparison between pond–constructed wetland system and oxidation pond system shows that total nitrogen removal in a constructed wetland is better than that in an oxidation pond and the TP removal is inferior. A possible reason is the low dissolved oxygen concentration in the wetland. Constructed wetlands can restrain the growth of algae effectively, and can produce obvious ecological and economical benefits.

Design and operation of an eco-system for municipal wastewater treatment and utilization

2006 ◽  
Vol 54 (11-12) ◽  
pp. 429-436 ◽  
Author(s):  
L. Wang ◽  
J. Peng ◽  
B. Wang ◽  
L. Yang
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Annual Average ◽  
Total Capital ◽  
Dongying City ◽  
Final Effluent ◽  
Better Than

An eco-system consisting of integrated ponds and constructed wetland systems is employed in Dongying City, Shandong Province for the treatment and utilization of municipal wastewater with design capacity of 100,000 m3/d. The total capital cost of this system is 680 Yuan (RMB) or US$82/m3/d, or about half that of the conventional system based on activated sludge process, and the O/M cost is 0.1 Yuan (RMB) or US$ 0.012/m3, only one fifth that of conventional treatment systems. The performance of the wastewater treatment and utilization eco-system is quite good with a final effluent COD, BOD, SS, NH3-N and TP of 45–65 mg/l, 7–32 mg/l, 12–35 mg/l, 2–13 mg/l and 0.2–1.8 mg/l respectively and the annual average removals of COD, BOD, SS, NH3-N and TP are 69.1%, 78.3%, 76.4%, 62.1% and 52.9% respectively, which is much better than that of conventional pond system or constructed wetland used separately and illustrates that the artificial and integrated eco-system is more effective and efficient than the simple natural eco-system.

Potential use of mangrove plantation as constructed wetland for municipal wastewater treatment

2003 ◽  
Vol 48 (5) ◽  
pp. 257-266 ◽  
Author(s):  
K. Boonsong ◽  
S. Piyatiratitivorakul ◽  
P. Patanaponpaiboon
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Free Water ◽  
Avicennia Marina ◽  
Pilot Scale ◽  
Natural Forest ◽  
Municipal Wastewater Treatment ◽  
Detention Time ◽  
Bruguiera Cylindrica

The study evaluated the possibility of using mangrove plantation to treat municipal wastewater. Two types of pilot scale (100 × 150 m2) free water surface constructed wetland were set up. One system was a natural Avicennia marina dominated forest system. The other system was a newly planted system in which seedlings of Rhizophora spp., A. marina, Bruguiera cylindrica and Ceriops tagal were planted in 4 strips. Municipal wastewater was retained within the systems for 7 and 3 days, respectively. The results indicated that the average removal percentage of TSS, BOD, NO3-N, NH4-N, TN, PO4-P and TP in the newly planted system were 27.6-77.1, 43.9-53.9, 37.6-47.5, 81.1-85.9, 44.8-54.4, 24.7-76.8 and 22.6-65.3, respectively. Whereas the removal percentage of those parameters in the natural forest system were 17.1-65.9, 49.5-51.1, 44.0-60.9, 51.1-83.5, 43.4-50.4, 28.7-58.9 and 28.3-48.0, respectively. Generally, the removal percentages within the newly planted system and the natural forest system were not significantly different. However, when the removal percentages were compared with detention time, TSS, PO4-P and TP percentages removed were significantly higher in the 7-day detention time treatment. Even though the removal percentages were highly varied and temporally dependent, the overall results showed that mangrove plantation could be used as constructed wetland for municipal wastewater treatment in a similar way to the natural mangrove system.

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.

Horizontal sub-surface flow constructed wetland with pulsing water level

2003 ◽  
Vol 48 (5) ◽  
pp. 143-148 ◽  
Author(s):  
J. Vymazal ◽  
M. Masa
Keyword(s):  
Water Level ◽  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Water Discharge ◽  
Experimental Period ◽  
Surface Flow ◽  
Treatment Efficiency ◽  
Outflow Velocity ◽  
In Series ◽  
Positive Effect

A constructed wetland with horizontal sub-surface flow at Dolni Mesto (Czech Republic) was put into operation in 1999 and treats municipal wastewater from 522 PE. The total area of vegetated beds of 2,646 m2 is divided into two parallel sections of equal size, each with two beds in series. Between two periods of water discharge there is no outflow from the bed. During the period of September 1999-September 2000 one bed was operated with a pulsing water level while the other one was not pulsing, i.e., was operated as regular sub-surface flow in order to evaluate the effect of pulsing on treatment efficiency, especially on removal of NH4-N. Between September 1999 and February 2000 the pulse was 8 cm, for the rest of the experimental period the pulse was 15 cm. The results indicate a positive effect of pulsing on removal of BOD5 (annual average of 53%), COD (30%) and NH4-N (27%) as compared to non-pulsing beds. For SS, a decrease in removal effect by 30% was observed. This is probably due to the higher outflow velocity of discharged water from pulsing beds which can flush out settled particles. The results also indicate that a pulsing level of 15 cm was more efficient than 8 cm.

Integrated Treatment of Domestic Wastewater Using Anaerobic Filter-Constructed Wetland in Military Camps

2011 ◽  
Vol 356-360 ◽  
pp. 1331-1334
Author(s):  
Tao Lv ◽  
Wu Long Zhang ◽  
Xie Zhang ◽  
Feng Xue
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Integrated Treatment ◽  
Municipal Wastewater Treatment ◽  
Anaerobic Filter ◽  
Integrated Technique ◽  
Packing Layer

This paper studies through project cases the treatment effect of integrated technique of anaerobic filter and constructed wetland on domestic wastewater in military camps, and the method for preventing the blocking of anaerobic filter and constructed wetland packing. The results show that its average removal rate of COD, NH4+-N, TP and SS is 83.1%, 37.5%, 49.8% and 91.5% respectively, with effluent meeting the standard of Grade II in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002); as planned, two anaerobic filters, one for operation and the other laying fallow at a alternate period of 6 months, in combination of the design of spoil disposal, can effectively prevent the packing layer from being blocked; being preprocessed, anaerobic filter can effectively prevent the packing layer of constructed wetland from being blocked; in case of a certain difference in elevation, the integrated technique can achieve unpowered operation. Besides, it is easy to implement and manage at a low operational cost without professional technician, and can treat decentralized domestic wastewater, therefore, is suitable for camps.

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