Water quality monitoring (WQM) workshop for Sengkang Floating Wetland

I have a rare opportunity to conduct a WQM workshop at Sengkang Floating Wetland which lies smack in the Punggol Reservoir. All thanks to PUB for arranging the venue and coordinating the overall workshop!

At the same time, this workshop was funded by the Water Education Fund from FairPrice which also sponsored my book - Your first guide to water quality monitoring in Singapore. Not surprisingly, all the participants were given a copy of the book to help them implement their own WQM programme.

 Figure (courtesy of PUB): Classroom lesson at Anchorvale CC before heading out to the field

Figure: Getting water samples on the floating wetland was made easy with the help of contract workers who happened to be there maintaining the wetland

Figure: In the middle of the floating wetland 

Figure: Participants getting their hands wet and dirty along Punggol Reservoir

Question on phytoremediation

Dear Mr Kwok,


My name is C and I am a marine life enthusiast like yourself. I recently had the opportunity to visit a few fish and shrimp farms in Brunei. These farms are in land farms beside the coast. I noticed that in some of the ponds the water is obviously highly toxic with large amounts of foam floating on the surface. Owner confirms that the water in these ponds have not been changed for 1-2 months.

As each pond is approximately 10 metres by 25 metres and 2 metres deep, each farm has 40-50 ponds, it may be expensive to perform frequent water change such as those done by owners of reef aquariums.

So if there are say 20 such farms in the area, each discharging the waste water directly into the sea, wouldnt the water quality in the area be adversely affected?

The question I have for you is this:

1) In a reef aquarium, we use a protein skimmer to remove dissolved organic materials and water changes to dilute the toxic compounds in the water. This is obviously too expensive for commercial fish farming. Some hobbyists have experimented with using mangrove saplings to remove dissolved organics as a replacement for the protein skimmer. Is it possible then, to grow mangrove on floating pontoons in the fish pond? Would this be a cost effective way to improve water quality in the pond and there by improving food safety?

2) What are the issues we might have to think about if we want to plant mangrove on floating pontoons?

Thanks and regards,

C



Dear C,

You may want to read through my posts on phytoremediation 

especially Singapore latest water attraction - Sengkang Floating Wetland and Before you write off a plant as a weed, read this


There are certainly many issues involved in phytoremediation via mangrove plants on floating pontoons aka floating wetlands, from conception, evaluation, design, implementation, operation to management.


I will attempt to touch on those that are close to my heart though I am sure there many other important ones which I will miss out.

1. I assume you want to use mangrove plants (I suppose you are referring to the tree types) because the water is brackish or salty. I strongly believe mangrove trees have a lot of potential to perform phytoremediation, especially removal of nutrients from pond water. However, though widely used in Asia and other tropical countries, documentation of their implementation and effectiveness are still lacking compared to other “traditional” phytoremediation plants. Certain salt marsh plants (e.g. cordgrasses, seaside rush) have been documented to be successfully used in brackish/salty water. Nevertheless, I would still encourage you to try mangrove trees since they are very much part of our natural heritage.


2. Cost! This can be a big issue if you are using any of the proprietary floating mats for holding your plants. There are many high-tech mats out in the market and they will cost you more than having a similar constructed wetland built on land. Alternatively, you can go the DIY route. I have seem floating platforms made out of bamboo, plastic bottles and other recycled materials.


3. One gripe I have with floating wetlands is their short reach with respect to the depth of the water body. You mentioned that you intend to use such floating wetlands to remove dissolved organics. Ideally, you will need a good root system well distributed laterally and vertically in the pond to achieve that. The root system allows bacteria to flourish and these are the guys on the ground removing your organics. Hence, the mangrove roots will need to go as deep as possible but a floating mat by its nature can impede the spread of the roots.


4. What about harvesting? Do you intend to remove the plants periodically? What if they grow too big for your mat to support? On the other hand, you need your plants to be big to be efficient in phytoremediation (think more biomass to absorb the nutrients or more roots with longer reach for bacteria to grow). Of course, harvesting and replanting will incur more costs.


Good luck!

 Figure: a DIY floating wetland in a pond in Chinese Garden

Figure: Rhizophora sp. in Sungei Buloh Wetland Reserve - a mangrove tree that has potential in phytoremediation, especially in brackish/saline waters

Water quality monitoring (WQM) workshop for Sengkang Floating Wetland

Below is a copy of the invitation sent out to MOE teachers.



Dear Educators,


We would like to invite you and your teachers to attend PUB’s Water Quality Monitoring Workshop:

Admission is free and course materials and equipments will be provided. Teachers will also receive a complimentary copy of the book,“ Your First Guide To Water Quality Monitoring in Singapore”, written by Mr Kwok Chen Ko in collaboration with PUB and the NTUC Water Education Fund.

This course is suitable for

 Science teachers, Green Club teachers and teachers interested in environmental or field work

 Teachers who are interested in conducting Water Quality Monitoring with students.

 Any teachers with a passion for the environment!


Trainer
Mr Kwok Chen Ko, Environmental Science lecturer from Singapore Polytechnic.

Course objectives

To introduce importance of water quality in the environment and how water quality monitoring can be carried out. At the end of the course, teachers will be able to:

(a) Appreciate the importance of water quality to the health of the environment.

(b) Explain how several fundamental water quality parameters interact with aquatic life.

(c) Perform field sampling of water.

(d) Perform water analyses in the field and classroom.


Topics covered

1. The types of freshwater systems in Singapore

2. What is water quality?

3. Important water quality parameters

4. The art of water sampling

5. The science of water analysis

6. How to conduct sampling, analysis and collection of water in the field.


Programme outline
The workshop consists of a classroom lecture followed by field work at the nearby Sengkang Floating Wetland.


Time Activity

1:00 PM – 1:30 PM Registration of participants

1:30 PM – 2:30 PM Lecture session:

-Introduction to Water Quality Monitoring in Singapore

- Water quality monitoring parameters

2:30 PM – 4:30 PM Practical session:

-Practical water quality testing exercise at Sengkang Floating Wetland

4:30 PM – 5:30 PM Debriefing session


Admission is limited to the first 20 participants only, so do register by 4 November 2011.

For registration please contact:

Ms Farah’ Ain Niza
Email: Farahain_Niza_Md_Tamren@pub.gov.sg
Tel no : 6731 3274