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8th IWA Specialist Group Conference on Waste Stabilization Ponds - Belo Horizonte/MG , April 2009
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Transcript of 8th IWA Specialist Group Conference on Waste Stabilization Ponds - Belo Horizonte/MG , April 2009
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8th IWA Specialist Group Conference on Waste Stabilization Ponds - Belo Horizonte/MG , April 2009
Trickling filters: Alternative for Ammonia Removal from Stabilization Pond System
Effluent
Mônica Medeiros Frederico de Almeida Lage Filho
Humberto Carlos Ruggeri Roque Passos Piveli
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Introduction Hundreds of active Stabilization Ponds in Brazil
However they don´t have nutrient removal capabilities and don´t meet discharge standards.
Atractive alternative is ponding system effluent application in agriculture: “fertirrigation”.
During wet weather periods effluent application into agricultural soils is troublesome need for post-treatment of ponding system effluent.
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Intro (continued) One option for post-treatment of ponding system
effluents is the TRICKLING BIOFILTER (TBF): an attached biomass growth reactor in which biological NITRIFICATION can take place.
TBF´s present small footprint pH, temperature, BOD and ponding system
effluent OD conditions are favorable to nitrification.
Resulting reactor volume quite possibly smaller than other post-treatment options, thus TBF option can be economically feasible.
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Research Work Objective
Evaluate effects of TKN and BOD application rates as well as other operational conditions on nitrification in tricking biofilters receiving photosynthetic facultative pond effluent.
Bigger picture:
Experimental results to subsidize assessment of the TBF alternative for improvement of ponding
system effluent quality.
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Methodology
Ponding System at city of Lins, SP Estabilização de Lins/SP
At the Lins field Station – testing field for agricultural reuse of ponding system effluent
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MethodologyTKN Volumetric Loading rates: 0,02 to 0,17 kg TKN/m3d Surface Hydraulic Loading rates: 2 to 12 m3/m2d
Tested TBF media: crushed rock no.4 & Pall brand plastic rings
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Results TKN Volumetric and Hydraulic Loading Rates into TBF´s
Phase 1 Phase 2 Phase 3
0,000,02
0,040,06
0,08
0 100 200 300Tempo (d)
CV
(kg/
m3.
d)
Filtro Plástico Filtro Pedra
0,02,0
4,06,0
8,0
0 100 200 300Tempo (d)
TAH
(m3/
m2.
d)
Filtro Plástico Filtro Pedra
0,02,04,06,08,0
10,0
0 20 40 60 80Tempo (d)
TAH
(m3/
m2.
d)
Filtro P lástico Filtro P edra
0,0
5,0
10,0
15,0
0 10 20 30Tempo (d)
TAH
(m3/
m2.
d)
Filtro Plástico Filtro Pedra
0,000,020,040,060,080,100,12
0 20 40 60 80Tempo (d)
CV
(kg/
m3.
d)
Filtro P lástico Filtro P edra
0,000,05
0,100,15
0,20
0 10 20 30 40Tempo (d)
CV
(kg/
m3.
d)
Filtro Plástico Filtro Pedra
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Comparison of phases 1 through 3 CONTROL:
pH & Temperature
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Comparison of phases 1 through 3
OD (mg/L) & Alkalinity (mg CaCO3/L)
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Comparison of phases 1 through 3 ORGANIC MATTER
BOD & COD (mg/L)
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Comparison of phases 1 through 3 N species:
Ammonia N (mg/L)
TKN (mg/L):
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Comparison of phases 1 through 3 N species:
Nitrite (mg/L)
Nitrate (mg/L):
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Conclusions
Both Trickling Biofilter media (crushed rock no. 4 & Pall plastic rings) achieved reduction of ammonia N
concentrations from the facultative pond effluent;
Nitrification occurred in all three experimental phases, indicated by high concentrations of nitrite and nitrate;
Regarding nitrification along phases 1 thru´ 3: Crushed rock TBF progress was faster and related
ammonia N removal efficiency was higher than for the Pall ring TBF.