Enriched Water Source Purification Using Artificial
Floating Wetlands

Prof.(Mrs)Yashodha Hirimuthugoda, Phd. and Dr.(Mrs.) A. R. Amarasinghe, Phd.

PUBLISHED ON June 10, 2021

Excess algae growth in water sources, especially due to the abundance of nutrients such as nitrogen and phosphorus, is called enrichment (Figure 1).

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Figure 1: Enrichment

This phenomenon has a profound effect on the aquatic ecosystem. This raises the temperature of the reservoirs and reduces the amount of dissolved oxygen in the water. After the algae die, it decomposes by microorganisms to convert the organic matter into an inorganic substance. This reduces the oxygen concentration in the water solution between oxygen expenditures. Greenhouse gases are also emitted. As a result, the fish die, the fish's eggs are destroyed and the caramel is trapped (Figure 2).


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Figure 2: the fish die, the fish's eggs are destroyed and the caramel is trapped or figcaption>

The artificial wetlands system, which is not yet prevalent in Sri Lanka, is the most widely used method of purifying water sources damaged by enrichment in other countries (Figure 3).

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Figure 3: Constructed wetlands

There are many reservoirs in Sri Lanka that have been damaged due to malnutrition but no systematic plans have been found to purify them. Since most of the ponds in our faculty today are well-fed, this study tested the suitability of the new system for other reservoirs in Sri Lanka using faculty ponds (Figure 4)

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Figure 4: There are many reservoirs in Sri Lanka that have been damaged due to malnutrition

The purpose of this study was to identify the most suitable plant species for water purification and to analyze the biomass deposits of selected species separately from the nitrogen and phosphorus to find the root: stem ratio of those plant species.

The methodology used for this is as follows

Three species of Kankun Wadakaha and Lunuwila were retained on a 2m x 2m Styrofoam processing system and added to the water three months later. The calculated parameters were obtained three weeks before and one week after the positioning of the settings.

Animal aquatic plant Aquatic pH, Liquid oxygen (DO) Total carbon content: (TC) Total organic carbon (TOC) Total nitrogen (TN), NH4-N, NO3-N, PO4-P It was then taken weekly for three months.

As per the recommendations of this project, there was a high potential for nitrogen and phosphorus deposition at the end of the project in the tortoiseshell. Wadakaha also had the highest potential for a combination of the above two nutrients. Therefore, Wadakaha proved to be suitable for artificial floating wetlands. Original: Stem ratios were 3.47, 2.41 and 1.31 in Kankun, Wadakaha and Lunuwila respectively

Meteorological data obtained from the water parameters and the period of the research confirmed that there were no variations in the water parameters, and that the plant species used in the analysis for the heavy metals were not finally determined to be heavy metals, so the conifers were added as food and medicine. It was recommended that it be taken.

The research should continue for another 12 months to calculate the water carrying capacity of the pond and to analyze the interactions between the microenvironment and the ecosystem.

Eng. Lanka Ramanayaka - CEO
Design Knigdom Lk
BSc(Eng), PG Dip.(BSE), CEng., MIE(SL), MEC(SL)
Chartered Engineer

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    Cameron Williamson
    May 23, 2021 at 12:23 pm

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    Rahabi Khan
    Nov 23, 2018 at 12:23 pm

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