A tracer study for assessing the interactions between hydraulic retention time and transport processes in a wetland system for nutrient removal

2011 ◽  
Vol 35 (3) ◽  
pp. 399-406 ◽  
Author(s):  
Ni-Bin Chang ◽  
Zhemin Xuan ◽  
Martin P. Wanielista
Keyword(s):  
Retention Time ◽  
Nutrient Removal ◽  
Hydraulic Retention Time ◽  
Transport Processes ◽  
Tracer Study ◽  
Wetland System

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.

scholarly journals UTILIZAÇÃO DE FORRAGEIRA NO TRATAMENTO DE ESGOTO DOMÉSTICO

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 92-100
Author(s):  
João de Jesus Guimarães ◽  
José Antonio Rodrigues de Souza ◽  
Débora Astoni Moreira ◽  
Ellen Lemes Silva ◽  
João Victor Costa ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Dry Matter ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Dry Mass ◽  
Application Rate ◽  
Domestic Sewage ◽  
Dry Matter Yield ◽  
Matter Production ◽  
Wetland System

UTILIZAÇÃO DE FORRAGEIRA NO TRATAMENTO DE ESGOTO DOMÉSTICO     JOÃO DE JESUS GUIMARÃES 1; JOSÉ ANTONIO RODRIGUES DE SOUZA 2; DÉBORA ASTONI MOREIRA3; ELLEN LEMES SILVA4; JOÃO VICTOR COSTA 5 E MARA LÚCIA CRUZ DE SOUZA6   Departamento de Engenharia Rural - Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu-SP, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Recursos Naturais do Cerrado, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km2.5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Rural - Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu-SP, Brasil, [email protected]     RESUMO   A utilização de forrageiras como vegetação em sistema de tratamento do tipo wetland tem sido estudado como forma de associar harmonia paisagística, eficiência e aproveitamento agrícola, facilitando sua aceitação. Neste estudo, objetivou-se estudar a utilização do o capim tifton 85 (Cynodon sp.) em wetlands. Para isso, avaliou-se a produção de matéria seca quando submetido a diferentes tempos de detenção hidráulico. Os resultados permitiram concluir que o capim tifton 85 mostrou-se adequado à utilização em sistemas de tratamento do tipo wetland, sendo o tempo de detenção hidráulico de dois dias (referente a uma taxa de aplicação superficial de 110 kg ha-1 d-1 de DBO) proporcionou a maior produção de matéria seca e, por consequência, maior de remoção de nutrientes.   Palavras-chave: Cynodon spp., massa seca, sistema alagado construído, água residuária.     GUIMARÃES, J. J.1; SOUZA, J. A. R2; MOREIRA, D. A.3; SILVA, E. L.4; COSTA, J. V.5; SOUZA, M. L. C.6 FORAGE USE IN DOMESTIC SEWAGE TREATMENT     ABSTRACT   The use of forages as vegetation in a wetland system has been studied as a way of associating landscape harmony, efficiency and agricultural utilization, facilitating its acceptance. The objective of this study was to study the use of tifton 85 grass (Cynodon sp.) in wetland systems. For this, the dry matter production was evaluated when subjected to hydraulic retention times. The results allowed to conclude that tifton 85 grass was suitable for use in SAC treatment systems, with a two-day hydraulic retention time (referring to a surface application rate of 110 kg ha-1 d-1 of BOD) provided the highest dry matter yield and, consequently, higher nutrient removal.   Keywords: Cynodon spp., dry mass, wetlands, wastewater.

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

The effect of hydraulic retention time on the removal of pollutants from sewage treatment plant effluent in a surface-flow wetland system

Wetlands ◽  
10.1672/13 ◽  
2005 ◽  
Vol 25 (2) ◽  
pp. 375-391 ◽  
Author(s):  
Sylvia Toet ◽  
Richard S. P. Logtestijn ◽  
Ruud Kampf ◽  
Michiel Schreijer ◽  
Jos T. A. Verhoeven
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Surface Flow ◽  
Wetland System

Removal of nitrogen and phosphorus from industrial wastewaters by phytoremediation using water hyacinth (Eichhornia crassipes (Mart.) Solms)

2004 ◽  
Vol 50 (6) ◽  
pp. 217-225 ◽  
Author(s):  
M.W. Jayaweera ◽  
J.C. Kasturiarachchi
Keyword(s):  
Mass Balance ◽  
Retention Time ◽  
Nutrient Removal ◽  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Hydraulic Retention Time ◽  
Nitrogen And Phosphorus ◽  
Promising Candidate ◽  
Industrial Wastewaters ◽  
Optimum Period

This paper elucidates the phytoremediation potential of water hyacinth (Eichhornia crassipes [Mart.] Solms) for TN and TP rich industrial wastewaters determined for 15 weeks under different set-ups of 2-fold (56 TN mg/l and 15.4 TP mg/l), 1-fold, 1/2-fold, 1/4-fold and 1/8-fold and a control with no nutrients in duplicate. A mass balance was conducted to evaluate the phytoremediation efficiencies and to identify the key mechanisms of nutrient removal from the wastewaters. Our results manifested that water hyacinth is a promising candidate for a batch removal of TN and TP from wastewaters. 100% removal of both TN and TP was observed at the end of the 9th week in all the set-ups mainly due to assimilation and the period between 6Ð9 weeks became the optimum period after which complete harvesting is recommended. Plants having an age of 6 weeks are ideal to commence the free-floating wetland and 21 days hydraulic retention time (HRT) is recommended for optimum removal of TN and TP. Assimilation and denitrification were the key mechanisms of TN removal while assimilation and sorption became the prominent mechanisms in the removal of TP from wastewaters.

scholarly journals ANALYSIS OF A WETLAND SYSTEM IN THE POST-TREATMENT OF WASTEWATER

2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Carlos Eduardo Zacarkim ◽  
Luciano Caetano De Oliveira ◽  
Nayara Symanski ◽  
Fernando Rodolfo Espinoza Quinõnes ◽  
Soraya Moreno Palácio ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Low Cost ◽  
Surface Flow ◽  
Wastewater Treatment Process ◽  
Wetland System ◽  
Simple Technology ◽  
Conventional Systems

The study was based on a surface flow wetland system, using the macrophyte Eicchornia crassipes. The use of wetlands as an alternative in the wastewater treatment process has been employed due to the handling and simple technology, addition to the low cost compared to conventional systems. Three hydraulic retention times, they are 4, 6 and 8 days were analyzed. In general the system showed significant results in relation to removals of nutrients for all TRH reviews, where the hydraulic retention time of 6 days achieved the best performance. The proposed system achieved 79.91% reductions for COD, 83.51% of Total Phosphorus, Total Nitrogen 67.93%, 87.7% chromium and 52% Sulfur.

The combined effects of carbon/nitrogen ratio, suspended biomass, hydraulic retention time and dissolved oxygen on nutrient removal in a laboratory-scale anaerobic–anoxic–oxic activated sludge biofilm reactor

2017 ◽  
Vol 77 (1) ◽  
pp. 248-259 ◽  
Author(s):  
D. S. Manu ◽  
Arun Kumar Thalla
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Retention Time ◽  
Nutrient Removal ◽  
Hydraulic Retention Time ◽  
Appropriate Technology ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
Biological Nutrient Removal ◽  
Suspended Biomass

Abstract The current trend in sustainable development deals mainly with environmental management. There is a need for economically affordable, advanced treatment methods for the proper treatment and management of domestic wastewater containing excess nutrients (such as nitrogen and phosphorus) which can cause eutrophication. The reduction of the excess nutrient content of wastewater by appropriate technology is of much concern to the environmentalist. In the current study, a novel integrated anaerobic–anoxic–oxic activated sludge biofilm (A2O-AS-biofilm) reactor was designed and operated to improve the biological nutrient removal by varying reactor operating conditions such as carbon to nitrogen (C/N) ratio, suspended biomass, hydraulic retention time (HRT) and dissolved oxygen (DO). Based on various trials, it was seen that the A2O-AS-biofilm reactor achieved good removal efficiencies with regard to chemical oxygen demand (95.5%), total phosphorus (93.1%), ammonia nitrogen concentration (NH4+-N) (98%) and total nitrogen (80%) when the reactor was maintained at C/N ratio of 4, suspended biomass of 3 to 3.5 g/L, HRT of 10 h, and DO of 1.5 to 2.5 mg/L. Scanning electron microscopy (SEM) of suspended and attached biofilm showed a dense structure of coccus and bacillus bacteria with the diameter ranging from 0.3 to 1.2 μm. The Fourier transform infrared (FTIR) spectroscopy results indicated phosphorylated macromolecules and carbohydrates mix or bind with extracellular proteins in exopolysaccharides.

Sign in / Sign up

Export Citation Format

Share Document