scholarly journals Nutrient removal in a constructed wetland treating aquaculture effluent at short hydraulic retention time

2018 ◽  
Vol 10 ◽  
pp. 329-343 ◽  
Author(s):  
J Dalsgaard ◽  
M von Ahnen ◽  
C Naas ◽  
PB Pedersen
Keyword(s):  
Constructed Wetland ◽  
Retention Time ◽  
Nutrient Removal ◽  
Hydraulic Retention Time ◽  
Aquaculture Effluent

scholarly journals Effect of hydraulic retention time on chemical oxygen demand and total nitrogen removal in intermittently aerated constructed wetlands

2020 ◽  
Vol 15 (3) ◽  
pp. 1 ◽  
Author(s):  
Isabela Pires da Silva ◽  
Gabriela Barbosa da Costa ◽  
João Gabriel Thomaz Queluz ◽  
Marcelo Loureiro Garcia
Keyword(s):  
Chemical Oxygen Demand ◽  
Constructed Wetlands ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Constructed Wetland ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Intermittent Aeration

   This study evaluated the effect of hydraulic retention time on chemical oxygen demand (COD) and total nitrogen (TN) removal in an intermittently aerated constructed wetlands. Two horizontal subsurface-flow constructed wetlands were used: one without aeration and the other aerated intermittently (1 hour with aeration/7 hours without aeration). Both systems were evaluated treating domestic wastewater produced synthetically. The flow rate into the two CWs was 8.6 L day-1 having a hydraulic retention time of 3 days. The results show that the intermittently aerated constructed wetland were highly efficient in removing COD (98.25%), TN (83.60%) and total phosphorus (78.10%), while the non-aerated constructed wetland showed lower efficiencies in the removal of COD (93.89%), TN (48.60%) and total phosphorus (58.66). These results indicate, therefore, that intermittent aeration allows the simultaneous occurrence of nitrification and denitrification processes, improving the removal of TN in horizontal subsurface-flow constructed wetlands. In addition, the use of intermittent aeration also improves the performance of constructed wetlands in removing COD and total phosphorus.

Symbiotic algal bacterial wastewater treatment: effect of food to microorganism ratio and hydraulic retention time on the process performance

2007 ◽  
Vol 55 (11) ◽  
pp. 165-171 ◽  
Author(s):  
M. Medina ◽  
U. Neis
Keyword(s):  
Growth Rate ◽  
Wastewater Treatment ◽  
Significant Influence ◽  
Retention Time ◽  
Nutrient Removal ◽  
Hydraulic Retention Time ◽  
Process Performance ◽  
Free Swimming ◽  
Effect Of Food ◽  
Total Nitrogen Removal

Algal incorporation into the biomass is important in an innovative wastewater treatment that exploits the symbiosis between bacterial activated sludge and microalgae (Chlorella vulgaris sp. Hamburg). It allows a good and easy algae separation by means of clarification. The effect of process parameters food to microorganisms ratio (F/M) and hydraulic retention time (HRT) on the process performance, evaluated by settleability, microalgae incorporation to biomass and nutrient removal, was studied. HRT hinted at a significant influence in the growth rate of algae, while F/M turned out to be important for stability when algae are incorporated into the biomass. This parameter also affects the total nitrogen removal of the treatment. Stable flocs with incorporated algae and supernatants with low free swimming algae concentrations were obtained at high HRT and low F/M values.

Impact of temperature and hydraulic retention time on pathogen and nutrient removal in woodchip bioreactors

2018 ◽  
Vol 112 ◽  
pp. 153-157 ◽  
Author(s):  
M.L. Soupir ◽  
N.L. Hoover ◽  
T.B. Moorman ◽  
J.Y. Law ◽  
B.L. Bearson
Keyword(s):  
Retention Time ◽  
Nutrient Removal ◽  
Hydraulic Retention Time

Effects of Connection Mode and Hydraulic Retention Time on Wastewater Pollutants Removal in Constructed Wetland Microcosms

2014 ◽  
Vol 43 (12) ◽  
pp. 1574-1581 ◽  
Author(s):  
Li-Jun Ren ◽  
Li-Li Xu ◽  
Yu-Yuan Zhang ◽  
Wei Pan ◽  
Sheng-Lai Yin ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Pollutants Removal ◽  
Wastewater Pollutants

Laboratory Research of Distributed Domestic Sewage by Constructed Wetland Treatment Process

2014 ◽  
Vol 1073-1076 ◽  
pp. 799-803
Author(s):  
Yu Qian Cui ◽  
Wen Xia Xie ◽  
Yue Li
Keyword(s):  
Water Treatment ◽  
Constructed Wetland ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Activated Carbons ◽  
Removal Rate ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Laboratory Research ◽  
Wetland Treatment

In order to solve practical problems of rural sewage treatment, constructed wetland waste water treatment system is chose to simulate, analyze and evaluate in laboratory. Sand and gravel, granular activated carbons were used as the filter media in the constructed wetland. Experimental results show that the removal rate of filter for the water treatment increases with the rise of the hydraulic retention time and the rise of the temperature. It can be satisfied with the treatment effect at an ambient temperature of 15°C, maintained for 4 days or more hydraulic retention time.

Sign in / Sign up

Export Citation Format

Share Document