Nitrogen mass balances for pilot scale biofilm stabilization ponds under tropical conditions

2011 ◽  
pp. 110-128
Keyword(s):  
Pilot Scale ◽  
Mass Balances ◽  
Stabilization Ponds ◽  
Tropical Conditions

Nitrogen mass balances for pilot-scale biofilm stabilization ponds under tropical conditions

2011 ◽  
Vol 102 (4) ◽  
pp. 3754-3760 ◽  
Author(s):  
M.A. Babu ◽  
N.P. van der Steen ◽  
C.M. Hooijmans ◽  
H.J. Gijzen
Keyword(s):  
Pilot Scale ◽  
Mass Balances ◽  
Stabilization Ponds ◽  
Tropical Conditions

Comparative study of domestic wastewater treatment efficiencies between facultative pond and water spinach pond

1995 ◽  
Vol 32 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Seni Karnchanawong ◽  
Jaras Sanjitt
Keyword(s):  
Growth Rates ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Organic Content ◽  
Water Spinach ◽  
Removal Rates ◽  
Mass Removal ◽  
Loading Rates ◽  
Tropical Conditions ◽  
Average Water

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

Energy saving processes for nitrogen removal in organic wastewater from food processing industries in Thailand

2004 ◽  
Vol 50 (6) ◽  
pp. 345-351 ◽  
Author(s):  
N.H. Johansen ◽  
N. Suksawad ◽  
P. Balslev
Keyword(s):  
Process Control ◽  
Energy Saving ◽  
Nitrogen Removal ◽  
Pilot Scale ◽  
Sludge Bulking ◽  
Tropical Conditions ◽  
Additional Process ◽  
Nitrogen Conversion ◽  
Energy Saving Process ◽  
Organic Wastewater

Nitrogen removal from organic wastewater is becoming a demand in developed communities. The use of nitrite as intermediate in the treatment of wastewater has been largely ignored, but is actually a relevant energy saving process compared to conventional nitrification/denitrification using nitrate as intermediate. Full-scale results and pilot-scale results using this process are presented. The process needs some additional process considerations and process control to be utilized. Especially under tropical conditions the nitritation process will round easily, and it must be expected that many AS treatment plants in the food industry already produce NO2-N. This uncontrolled nitrogen conversion can be the main cause for sludge bulking problems. It is expected that sludge bulking problems in many cases can be solved just by changing the process control in order to run a more consequent nitritation. Theoretically this process will decrease the oxygen consumption for oxidation by 25% and the use of carbon source for the reduction will be decreased by 40% compared to the conventional process.

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