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Exploring Chemical Treatment Options for Hydrogen Sulphide Control in Wastewater

Hydrogen Sulphide (H2S) in wastewater networks is present to some extent in almost every region in New Zealand. High levels of H2S can also be commonplace, posing several serious challenges to asset o
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Activated Sludge Treatment Efficiencies

These factors are all closely linked.  If you have identified any one of these issues in your plant, it is likely to be related to or contributing to the cause of the others.  They are also the cause
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Shifting Winery Sustainability in Marlborough: The Salinity Dilemma – A Case for Magnesium Hydroxide in Wastewater Treatment

Over the past two decades, Marlborough's wine industry has experienced significant expansion, with the region producing approximately 268 million litres of wine in 2022. Remarkably, for every litre of
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Control Methods for Filamentous Foaming

Three filamentous organisms can cause activated sludge foaming: Nocardia and Microthrix parvicella (commonly) and type 1863 (rarely).

Nocardial foam occurs as a thick, stable, brown foam or "scum" in
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Bioaugmentation Coupled with Nutrients Benefits Wastewater Treatment

When applied correctly bioaugmentation heavily benefits wastewater systems, and the addition of micronutrients adds to this performance.
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Replacing Sodium Hydroxide for pH Control

Fruit and vegetable processing plants generate large volumes of acidic wastewater that cannot be discharged without pretreatment.

The acidic waste from a fruit processing plant in the Pacific Northwe
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Grease Control in Winter

As cold temperatures close in, we get more and more samples coming in requesting treatment for M. parvicella foaming. But why does this filament seem to thrive in the winter?Microthrix parvicella is a
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The Problem with Long Chain Fatty Acid Degradation in Aerobic Systems

For every gram of grease wastewater plants receive, a good percentage is made of hard-to-degrade long-chain fatty acids. To understand why long-chain fatty acid degradation is so tough, we must look a
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Nitrate Removal in Wastewater Treatment

Nitrate is a sneaky molecule that is difficult to remove and can migrate quickly into groundwater. This leads to concerns for elevated nutrients in waterways and can compromise drinking water. Wastewa
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Midge Flies & Red Worms in Wastewater

Does your lagoon system or wastewater treatment plant suffer from midge fly outbreaks? Midge flies, or chironomids, which resemble mosquitoes but don’t bite, commonly occur in wastewater treatment and
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Understanding Filament Issues in Wastewater

Filaments can cause all sorts of headaches for wastewater operators such as foaming and bulking. These problems can lead to violations in wastewater limits and less efficient treatment. Bulking...
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Tackling Hydrogen Sulphide Odour and Corrosion

Magnesium Hydroxide: Environmentally-Friendly and Cost-Effective Treatment for Odour and Corrosion in Sewer Lines
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Degradation of Dairy Protein in Wastewater

A wastewater pond requires sufficient Dissolved Oxygen (DO) to satisfy Biological Oxygen Demand (BOD) and Nitrogenous Biochemical Oxygen Demand (NBOD). Without DO, a pond can experience odours, high e
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Where Did the Dissolved Oxygen Go In My Wastewater Pond?

A wastewater pond requires sufficient Dissolved Oxygen (DO) to satisfy Biological Oxygen Demand (BOD) and Nitrogenous Biochemical Oxygen Demand (NBOD). Without DO, a pond can experience odours, high e
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Advantages of Industrial Lagoons for Wastewater Treatment

Lagoons are usually thought of in the context of municipal wastewater treatment, however, they are also popular for many industries, such as fruit and vegetable, meat, dairy processing, and wineries.
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Lagoon Microbiology: Heterotrophs vs. Autotrophs

Biological treatment is the most efficient way of removing soluble compounds from wastewater. Until recent times, it was functionally the only way. Biological treatment is far more efficient and avail
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The Hidden Costs of Replacing a Lagoon with a Mechanical Plant

When confronted with new discharge consent requirements, many municipalities feel their only option is to decommission their otherwise adequate wastewater lagoon treatment system and replace it with a
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Meat Processing Wastewater Lagoon Aeration

A meat processing wastewater lagoon can have a bad reputation because of the potential for sludge build-up and odour. However, a properly functioning meat processing wastewater lagoon, one with suffic
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Using Wastewater Lagoon pH as a Diagnostic Tool

Wastewater lagoon pH is a common testing parameter that is easily taken for granted. Dig a little deeper, however, and pH can give you valuable clues about what’s going on in your lagoon and help.....
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Troubleshooting Low Lagoon Dissolved Oxygen

Lagoon dissolved oxygen, or DO, is the lifeblood of the wastewater lagoon system. The bacteria and other microbes that consume biological oxygen demand (BOD) need 1.5–2 lbs. of dissolved oxygen per...
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Lagoon Solids: Using the TSS to BOD5 Ratio to Diagnose Treatment Problems

Biological Oxygen Demand (BOD) and Total Suspended Solids, or TSS, are standard testing parameters for wastewater lagoons. The ratio between the two numbers can provide valuable insight into........
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Lagoon Sludge Reduction In Situ: Methods of Removing Sludge in Place

One of the benefits of lagoons for wastewater treatment is their built-in sludge storage, which reduces the need for sludge handling. However, every lagoon will eventually require dredging to........
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Removing sludge from a NZ municipal wastewater oxidation pond

Here’s how we helped to remove an excess of 1,500m3 of wet sludge volume from an NZ municipal wastewater oxidation pond, within six months, using Parklink’s Advanced Microbial Digestion (AMD) system.

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Enhanced microbial digestion

Enhanced Microbial Digestion is the process of adding specific cultures of microorganisms to WSP in quantities sufficient to increase the average rate of hydrolysis, resulting in reduction of accumula
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Wastewater pond sludge measuring techniques

Wet sludge volume, sludge solids concentrations and inert fraction of dry solids are the main considerations when quantifying or surveying the accumulated sludge in a WSP. All survey levels should be
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Denitrification and Floating Sludge

Denitrification is the conversion of soluble nitrate to nitrogen gas in the nitrogen cycle. For denitrification to occur, three factors are needed:
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Wastewater Pond Sludge Level Monitoring

Periodically checking the sludge levels in the WSP can be performed to assess sludge accumulation, and to assist with planning and budgeting for sludge removal. Ideally sludge depth profiles should...
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Bioaugmentation – your questions answered.

The term “bioaugmentation” for using a microbial additive to enhance a biological process is an apt one. Added microbes augment the existing biomass making it more stable and increasing its ability to
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Handling Toxicity Due To Excess Disinfectant

With increased disinfecting protocols due to COVID-19, we are seeing large quantities of cleaning products reaching wastewater plants............
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Benefits of Sludge Control, Removal & Management in New Zealand

The South Taranaki District Council is the first council to use an innovative scheme using bacteria for sludge removal in New Zealand from the Hawera wastewater treatment pond.
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