OVERVIEW

River and Drainage Treatment

River pollution is a common issue everywhere. One of the reasons for river pollution is when effluents from factories, agricultural farms, and slaughterhouses get into the river without adequate treatment to remove the harmful compounds.

These effluents may introduce chemical pollutants and pathogens into these surface water bodies, which are harmful to humans and aquatic ecosystems.

Before making the wastewater fit for disposal, it needs to be treated correctly. Once treated, the water can be reused or disposed into the water bodies safely.

Solution

Enhanced Phycoremediation and Bioremediation in River and Drainage Treatment

Summary

Sungai Gong (River Gong) is a 300/600 MLD River in Malaysia. It is deeply polluted with effluents from industry, agricultural farms, domestic wastewater, and slaughterhouses. A pilot trial leveraging the breakthrough technology from AquaBio was deployed for three months to assess the effectiveness against multiple points and non-point pollutants. The trial was able to achieve its goals whereby within 12 weeks the water quality improved from Class IV to Class II as defined under Malaysian River Standards.

Besides the improvement in water quality, aquatic life and aquatic biodiversity, there was a significant improvement in terms of chemical parameters such as Dissolved Oxygen, BOD5, COD, Ammonia, Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC).  The technology brings in multiple dividends of delivering improved Water Quality as well as Carbon sequestration by Diatoms.

Location of Sampling points and flow direction of Sungai Gong River

Sungai Gong project was a huge success as the water quality improved from Class IV to Class II as defined under Malaysian River Standards within 12 weeks. 

Besides the improvement in water quality, aquatic life and aquatic biodiversity, the technology could fix tons of Carbon (1.7 tons of N and 0.5 tons of P per day). 

Project Objectives

Targets

Challenges

Methodology

1. Survey analysis 
The prime step is to conduct preliminary testing of the water body. It includes testing of various physical, biological and chemical parameters to understand the water quality and treatment plan. The site is also surveyed.

Parameters tested were:

  • Standard Water Quality Index such as Dissolved Oxygen (DO), Biochemical Oxygen Demand on 5 Days (BOD5), Chemical Oxygen Demand (COD), Ammoniacal Nitrogen (AN), pH, and Total Suspended Solids (TSS)
  • Other additional parameters such as TOC, DOC, Turbidity, Color, Odor, and Oil & Grease.
  • Phytoplankton Diversity – The dominant species from a variety of phytoplankton or microalgae such as Diatom, Cyanobacteria
  • (Blue-green algae), Green Algae, and Dinoflagellates.

2. Dosing
Dosing of AquaBio Solution and the bacterial formulation was done onto the surface of the water body. It was continued till the water quality matched the prescribed standards. Feeding diatoms with silica-based micronutrients will help increase multiplications of diatoms population in water bodies. Due to sunlight exposure, nutrients and carbon dioxide, photosynthesis of diatoms occurs rapidly, thus producing oxygen naturally in the water system. Diatoms also assimilate nitrogen and phosphorous rapidly. Bacteria and microbes are activated by consuming natural oxygen in the water. Highly oxygenated water will help degrade pollutants and organic matters, thus improving the river’s water quality. The symbiotic relation between diatoms and bacteria is a key factor in restoring the natural ecosystem and water quality improvement.

3. Monitoring of water quality
National Water Quality Standard – There was a significant improvement in terms of chemical parameters such as Dissolved Oxygen, BOD5, COD, Ammonia, Total Organic Carbon (TOC) and Dissolved Organic Carbon (DOC).

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