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8th IWA Specialist Group Conference on Waste Stabilization Ponds - Belo Horizonte/MG , April 2009. Utilization of Shallow Ponds for Ammonia Nitrogen Removal from Facultative Pond Effluent. Humberto Carlos Ruggeri Frederico de Almeida Lage Filho Mônica Medeiros Roque Passos Piveli.

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8th iwa specialist group conference on waste stabilization ponds belo horizonte mg april 2009
8th IWA Specialist Group Conference on Waste Stabilization Ponds - Belo Horizonte/MG , April 2009

Utilization of Shallow Ponds for Ammonia Nitrogen Removal from Facultative Pond Effluent

Humberto Carlos Ruggeri

Frederico de Almeida Lage Filho

Mônica Medeiros

Roque Passos Piveli

state of the art
State of the Art
  • Ponding Systems can be economically feasible alternatives regarding wastewater treatment in developing countries & small communities.
  • There are hundreds of ponding systems in operation in Brazil, however there is a lack of predictive models for ammonia N.
introduction
Introduction
  • Ammonia N removal can take place by means of three processes:
    • Ammonia stripping to the atmosphere
    • Ammonia assimilation by algal biomass
    • Biological Nitrification.
  • Several researchers (e.g. Yánez) have reported that ammonia N removal via nitrification in photosynthetic ponds is NOT SIGNIFICANT.
introduction cont
Introduction (cont.)
  • Pano & Midlebrough (1) associated ammonia N removal in ponds with: surface hydraulic loading rate, the depth, pH and temperature – they recognized volatilization as the main mechanism.
  • Yánez (2) associated ammonia N removal to the TKN and BOD loading rates and stablished an experimental model.
objective
Objective
  • To investigate which type of connection there is between ammonia N loading rate and ammonia concentration in the maturation pond final effluent

An in parallel look: possible effects of the pond depth and stripping to atmosphere.

experimental setting intro
Experimental Setting - Intro
  • Experimental Field Station owned by SABESP, located in the municipality of Lins, SP.
  • Agricultural reuse of treated sewage.
  • Real scale treat// system treats domestic sewage generated by 65,000 inhabitants: anaerobic pond followed by facultative pond
experimental setting
Experimental Setting
  • Facultative pond effluent fed to tertiary treatment pilot ponds.
experimental setting cont
Experimental Setting (cont.)
  • Two pilot scale ponds - 8 m long and 2 m wide.
  • Chicane: L/W = 16/1
experimental results
Experimental Results
  • Operating Conditions: HRT
results
Results
  • Phase 01 – (HRT = 5 days)‏
results1
Results
  • Phase 02 – (HRT =10 days)‏
results2
Results
  • Phase 03 – (HRTD-1,0m=15 days; HRT D-0,5m= 7,5 days)‏

(Same surface area and flowrate)

results3
Results
  • Comparison between phases

Alkalinity

Dissolved Oxygen

results4
Results
  • Comparison between phases

pH

Temperature

results5
Results
  • Comparison between phases

Total BOD

Total COD

results6
Results
  • Comparison between phases

Ammonia N

TKN

conclusions
Conclusions
  • The experimental results so far have shown the feasibility of ammonia N removal by means of tertiary complementary ponds, and the influence of pond depth.
  • Experimental results from subsequent phases should lead to treatment conditions that are necessary to obtain tertiary pond effluents with target ammonia N levels.