Enhancement of COD removal in constructed wetlands treating saline wastewater: Intertidal wetland sediment as a novel inoculation

2019 ◽  
Vol 249 ◽  
pp. 109398 ◽  
Author(s):  
Qian Wang ◽  
Zhenfeng Cao ◽  
Qian Liu ◽  
Jinyong Zhang ◽  
Yanbiao Hu ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Cod Removal ◽  
Wetland Sediment ◽  
Saline Wastewater ◽  
Intertidal Wetland

Differences in bacterial N, P, and COD removal in pilot-scale constructed wetlands with varying flow types

2020 ◽  
Vol 318 ◽  
pp. 124061
Author(s):  
Luping Zeng ◽  
Ran Tao ◽  
Nora Fung-yee Tam ◽  
Wenda Huang ◽  
Longzhen Zhang ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Pilot Scale ◽  
Cod Removal

Subsurface-flow constructed wetlands treatment in the plains: five years of experience

2001 ◽  
Vol 44 (11-12) ◽  
pp. 375-380 ◽  
Author(s):  
M.F. Dahab ◽  
R.Y. Surampalli
Keyword(s):  
Constructed Wetlands ◽  
Fecal Coliform ◽  
Subsurface Flow ◽  
Operating Conditions ◽  
Cod Removal ◽  
Variable Loading ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Sand Filter ◽  
Subsurface Flow Constructed Wetlands

This paper documents the performance of a subsurface-flow constructed wetlands system during its initial five years of operation under variable loading and operating conditions associated with a northern midwestern US climate. The results indicate that effective and sufficient CW seasonal removals of TSS, VSS, CBOD5, COD, and fecal coliform were achieved. Wastewater temperatures seemed to affect CBOD5 and COD removal rates. Nitrogen and phosphorus reductions were not as effective and varied seasonally, as well as with wastewater temperature. The addition of a sand filter, to aid in further nitrification and disinfection following CW treatment, markedly improved the performance of the wetlands system. After a few years of operation, the remarkable performance of the CW system was dampened by apparent clogging and subsequent eruption of wastewater at the head-end of the treatment cells. While clogging was partially caused by biomass build-up in the wetlands substrate, visual observations suggest that excessive vegetation coupled with relaxed maintenance may also be responsible for clogging.

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