Tasik Taman Aman Lake Rehabilitation

Petaling Jaya Town Council - Selangor, Malaysia

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Home \ What we have done \ Lake and pond remediation at Tasik Taman Aman Lake, Petaling Jaya Town Council
AQUA-Cal+ a safe and effective method for treating lakes and water bodies at Petaling Jaya Town Council, Selangor, Malaysia.

case study summary

Challenges

Bad smell from lake

Poor water quality

High sludge volume

Algae contamination

Very little water movement

Objective

Reduce or eliminate the smell

Improve water quality

Reduce BG Algae (done in conjunction with Algae Pro)

Change sludge composition from anoxic condition to aerobic

Sludge reduction

AQUA-Cal+ for lake and pond water remediation

Calix has developed AQUA-Cal+ as a safe, environmentally friendly water conditioner to directly address problems associated with lake remediation such as fish kills, odour, bad algae blooms, little circulation, and sludge build-ups.

Find out more about AQUA-Cal+

Benefits of AQUA-Cal

pH and Alkalinity control

Sludge digestion

Removal of bad odours (H2S and Ammonia)

Reduction of phosphate and ammonia (Struvite reaction)

Improve water quality and clarity

Provide additional O2

Introduction

Tasik Taman Aman in Section 22, Petaling Jaya is a disused tin-mining pool turned recreational lake for the pleasure of the public. The lake has low water flow and prone to water quality issues due to run-off from the surrounding catchments.

Tasik Taman Aman, similar to many urban lakes, experience uncontrollable algal and aquatic plant growth in their surface waters as a result of unnaturally large inputs of nitrogen (N) and phosphorous (P) from polluting run-offs. This causes the algae and aquatic plants to bloom and eventually massive die offs occur in the lake, resulting in large quantities of organic matter being deposited to the lake bed.

This organic matter is decomposed, consuming oxygen in the water column and releasing additional N and P back into the water column that will go on to fuel even more algal growth.

Without oxygen at the bottom at all times, beneficial bacteria and insects cannot biodegrade the organic sediment at bed level of the lake. It is important to maintain healthy levels of dissolved oxygen in your lake because the oxygen aids in the breakdown of decaying vegetation and other nutrients that find their way into the water.

Challenges

The main challenge with this lake is eutrophication and the foul odour emitted from the dead algae. Constant input of organic matter to the lake in the form of grass clippings and leaves from the surrounding park, bread and other food used to feed the fishes in the lake as well as runoff from the storm drain during heavy rain combined with little water movement has caused a persistent blue green algal bloom.

The lake’s inlets have been blocked and has very little inflow. There is only 1 outlet and outflow of lake water is slow. The lake water is stagnant in most parts, particularly areas close to the banks. The middle of the lake has a couple of fountains that affects movement just on the water surface and doesn’t do much to create mixing or aeration in the water column. Previous treatments using EM (effective microorganism) and Ultrasound only treated the symptoms of the problem. After years of ineffective treatment this lake has a very high deposit of toxic sludge, bad algae growth which causes a very bad odour problem particularly in the dry months.

As this lake is used for recreation and fishing, the toxicity and aesthetic aspects needs to be improved so that the public can fully utilise this facility. Also the potential health aspects of an unhealthy lake needs to be considered.

After treatment with AQUA-Cal+, and in combination with Algae Pro and probiotic used, there was a marked reduction in blue green algae.

After treatment with AQUA-Cal+, there was no longer any foul odour emitted from the lake.

WHAT AQUA-Cal+ ACHIEVES

Hence a new solution has come to light which would address the problem of algal formation and not just treat the symptom of algal bloom. This solution is in the form of a product named Aqua-Cal+, developed by the company Calix, a multi-award-winning Australian technology company that is developing new processes and materials to solve global challenges.

AQUA-Cal+ is a special formulated high surface area Magnesium Hydroxide and enhanced with Calcium that acts to improve the overall water quality while delivering a number of unique properties to protect and enhance the lake conditions. Aqua-Cal+ is non toxic, non-corrosive, safe to handle and environmentally friendly.

The consumption of ammonia and phosphate by Aqua-Cal+ from the aerobic sludge digestion process results in the formation of struvite, accompanied by the release of hydroxide ion (more Dissolved Oxygen in the water!), allowing the sludge to maintain the aerobic digestion process as long as the particles of magnesium hydroxide are available within the sludge.

Results

We had some challenges during treatment mainly the control of algae and the increase of pH up to almost 9 due to the buffering effect of AquaCal+. AquaCal+ may have provided more water column space for the fishes to thrive but the struvite reaction in a eutrophic lake with very little flushing and continuous runoff input does not help in the control of the algal bloom. It is unavoidable that AquaCal needs to be complemented by usage of beneficial bacteria.

Our aim over the next 5-6 years is to restore Tasik Taman Aman’s ability to sustain itself under the continued burden of nutrient overloading. If we can restore the lake’s nutrient cleaning mechanism which diverts nutrients into a healthy ecosystem, sustainability is achieved. Unfortunately, most commonly used lake restoration/ rehabilation strategies are not restorative.

They treat the symptoms of the lake ecosystem decline without fixing what’s wrong with the system in the first place. We’ve found that restoring a lake’s nutrient conversion system gives it the best shot at sustainable lake health. If we are able to restore the system, we’ll not only repair the historical damage nutrient overloading has already caused the lake, we hope to give the lake what it needs to sustain itself in the future under the continual burden of overloading from run-offs.

We find AQUA-Cal+ a safe and effective method for treating lakes and water bodies. AQUA-Cal+ is definitely the best current method to bring the lake back to a balanced ecosystem using environmentally friendly and sustainable techniques.

AQUA-Cal+™ is rapidly becoming an essential part of many farms’s pond management program, as improvements in water quality result in better feed performance and yield.

AQUA-Cal+™ has been shown in field trials to reduce the iron content of pond water, promote micro flora growth and manage pond bottom septicity in both prawn and fin fish farming. Used in both hatcheries and grow out ponds, AQUA-Cal+™ is rapidly becoming an essential part of many farm’s pond management program.

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AQUA-Cal+ a safe and effective method for treating lakes and water bodies at PETALING JAYA TOWN COUNCIL.

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