Nutrient Removal in Sequential Batch Polishing Ponds

One of the main problems of waste stabilization ponds (WSP) is that they cannot remove nutrients when treating wastewater. Polishing ponds (PP) can efficiently remove nitrogen and phosphorus from effluents after efficient anaerobic pretreatment. It shown that the feasibility of nutrient removal is d...

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Bibliographic Details
Published in:Water (Basel) 2021-06, Vol.13 (11), p.1584
Main Authors: dos Santos, Silvânia Lucas, van Haandel, Adrianus
Format: Article
Language:English
Subjects:
Algae
Alkalinity
Ammonia
Biological activity
Biomass
Calcium
Carbon dioxide
Chemical oxygen demand
Experiments
Liquid phases
Magnesium
Nitrogen
Nitrogen removal
Nutrient removal
Nutrients
Oxidation
Oxygen production
Phosphates
Phosphorus
Phosphorus removal
Photosynthesis
Polishing
Ponds
Retention
Stabilization ponds
Waste stabilization ponds
Wastewater
Wastewater treatment
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Summary:One of the main problems of waste stabilization ponds (WSP) is that they cannot remove nutrients when treating wastewater. Polishing ponds (PP) can efficiently remove nitrogen and phosphorus from effluents after efficient anaerobic pretreatment. It shown that the feasibility of nutrient removal is directly related to the pH that is established in the ponds. WSP normally operate at near neutral pH, but the biological processes that develop in PP tend to cause an elevation of pH and this, in turn, triggers the mechanisms of nutrient removal in ponds. In PP oxygen production by photosynthesis predominates over the oxidation of organic material. The net oxygen production has an equivalent CO2 consumption and this induces an increase in pH. The mechanism for nitrogen removal was identified as the desorption of ammonia from the liquid phase of the ponds. It was established that in ponds with a uniform concentration profile in the liquid phase the process developed in accordance with Fick’s law. The governing mechanism of phosphorus removal was precipitation with ions present in the wastewater, presumably calcium and magnesium. Polishing ponds can be operated with two different hydrodynamic regimes: flow-through (FTPP) and sequential batch (SBPP) ponds. The SBPP have the advantage that the pH elevation is more rapid, and that the final pH is higher.
ISSN:2073-4441
2073-4441
DOI:10.3390/w13111584