AI Article Synopsis
- * Testing at different hydraulic retention times (HRTs) showed significant nutrient reduction when HRTs were longer than 1.1 days, especially between 2 and 4 days, but high organic matter levels limited zooplankton effectiveness to tertiary treatment.
- * The impact of copper on Daphnia was analyzed, revealing that while they adapted to low copper levels, high concentrations (380 μg Cu L) for two weeks were detrimental to the system's health.
Article Abstract
The combination of the filtration capacity of zooplankton (e.g. Daphnia) with the nutrient removal capacity of bacterial/algal biofilm in a zooplankton-containing reactor could provide a natural-based alternative for wastewater treatment. A laboratory-scale zooplankton-based reactor was tested at different HRTs resulting in a significant reduction in nutrient concentrations in wastewater when the system was operated at HRTs longer than 1.1 days (preferably of between 2 and 4 days). However, the presence of high concentrations of organic matter (>250 mg COD L) in the wastewater inhibited zooplankton activity, limiting its use to tertiary treatment. Therefore, in combination with other natural treatments that can perform primary and secondary treatments, zooplankton may provide a solution for wastewater clarification and nutrient polishing. The effect of a common metal such as copper on the filtration capacity of Daphnia was also evaluated. Daphnia, as well as the whole zooplankton-based reactor, adapted to copper concentrations of up to 70 μg Cu L but an overload of 380 μg Cu L for two-weeks severely affected the biological system.
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| http://dx.doi.org/10.1016/j.chemosphere.2019.124683 | DOI Listing |
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