scholarly journals Formaldehyde degradation in denitrifying woodchip bioreactors: Effects of temperature, concentration and hydraulic retention time

2021 ◽  
pp. 102199
Author(s):  
Mathis von Ahnen ◽  
Lars-Flemming Pedersen ◽  
Per Bovbjerg Pedersen
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Formaldehyde Degradation ◽  
Effects Of Temperature

Effects of temperature and hydraulic retention time on anaerobic digestion of food waste

2006 ◽  
Vol 102 (4) ◽  
pp. 328-332 ◽  
Author(s):  
Jung Kon Kim ◽  
Baek Rock Oh ◽  
Young Nam Chun ◽  
Si Wouk Kim
Keyword(s):  
Anaerobic Digestion ◽  
Food Waste ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Effects Of Temperature

Study on Surface Flow Constructed Wetland Treating Slightly Polluted River Water in the High Latitude and Cold Region

2013 ◽  
Vol 726-731 ◽  
pp. 3501-3505 ◽  
Author(s):  
Zhi Gang Zhao ◽  
Yong Xiang Zhang ◽  
Shuo Jia Peng ◽  
Zhi Yuan Li ◽  
Wei Yao Li
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Surface Flow ◽  
Polluted Water ◽  
Cold Region ◽  
Polluted River ◽  
N Removal ◽  
Wetland System ◽  
Removal Efficiencies ◽  
Effects Of Temperature

Surface flow wetland with Reed planted in it was employed to treat micro-polluted water in Xinkai river, and effects of temperature, hydraulic retention time and growth of plants on the performance of surface flow wetland were studied. The results showed that COD removal of surface flow wetland was influenced by growth of plants and temperature, hydraulic retention time affected the performance of surface flow wetland obviously. NH4+-N removal of surface flow wetland was excellent and stable. Most of the area of the wetland system was under anaerobic or anoxic, Concentration of NO2--N and NO3--N in effluent stayed low. The denitrification was fully conducted but nitrification became a constraining factor. TP removal performance of surface flow wetland was ordinary. When Temperature was greater than 16°C, the hydraulic retention time was greater than the 3d and plants grew well, removal efficiencies of CODNH4+-N and TP were 22.45%,70.10% and 55.80% with concentration below 30.21mg/L1.82mg/L and 0.36mg/L, and the standards of Surface Water Grade V were satisfied.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

Evaluation of a tropical single-cell waste stabilization pond system for irrigation

1995 ◽  
Vol 31 (12) ◽  
pp. 267-273 ◽  
Author(s):  
B. S. O. Ceballos ◽  
A. Konig ◽  
B. Lomans ◽  
A. B. Athayde ◽  
H. W. Pearson
Keyword(s):  
Single Cell ◽  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Full Scale ◽  
Waste Stabilization Pond ◽  
North East ◽  
Helminth Eggs ◽  
Waste Stabilization ◽  
Better Than

A single full-scale primary facultative pond in Sapé, north-east Brazil was monitored for performance and efficiency. The pond had a hydraulic retention time of 61 days and achieved a 95% BOD5 removal efficiency and had no helminth eggs in the effluent. The effluent failed to meet the WHO faecal coliform guideline for unrestricted irrigation. The pond was dominated by the cyanobacterium Microcystis and gave better than predicted orthophosphate removal. Details of how the system could be simply upgraded utilizing the same land are discussed.

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