Ask The Expert

We get asked a lot of questions about water and wastewater treatment. Here are the most popular.

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Question: How can we reduce our carbon footprint?

“My company has very ambitious carbon reduction targets so we’re always on the look-out for ways in which we can cut fuel consumption and reduce our CO2 footprint. We’re in the process of scheduling delivery and installation of BIOdek plastic media trickling filters. We’re concerned about the delivery miles bumping up our carbon footprint. And then there’s the additional energy we’ll consume during the build and installation process. We really are under the carbon cosh here. Is there anything you can suggest that will make an immediate and positive impact?”


Answer: How about having the foils delivered to your location and the filters built on-site? Because 2H foils come in flat-packs, they can be delivered in large quantities – on average 18 tonnes per truck – direct to a location convenient for you. 2H has manufacturing plants worldwide which not only helps minimise delivery miles but also ensures fast product availability. As a result, the average UK delivery distance is 150 miles, producing a carbon footprint of 0.5kg per cubic metre and CO2/m3 emissions of 3.45kg.

Question: How can I improve my existing wastewater treatment plant?

“I want to improve the treatment capacity of my existing mixed media wastewater treatment plant but I don’t want to ‘throw’ everything out. What can you advise?”


Answer: The simple answer is to replace only the elements of your plant that aren’t performing. Here’s a recent example of the 2H approach. An international food manufacturer experienced problems at its primary UK waste water treatment plant.While the plants roughing filter was performing up to standard the random media trickling filters were failing to meet effluent standards. We responded with a cost-effective ‘best of both worlds’ solution that solved the performance and throughout issues at source by replacing only the under-performing random media with BIOdek structured plastic media. Tailoring the solution to the client ensured the client would continue benefiting from the reliable, low-maintenance and low-cost service provided by its existing roughing filters. If your current supplier isn’t offering the same level of personalised service, maybe it’s time to look elsewhere.

Question: Can you prove that the 'media' is up to the task?

“I’m leading a team planning a Cooling Tower refurbishment for a long-term client. We’ve talked to several media suppliers and we’re now are down to a choice between 2H Water Technologies and another company. I’m not comfortable making a final decision without some ‘proof’ that the proposed fill packs are up to the task and will deliver a solution that meets the operational objectives we have for this project? What can you suggest?”


Answer: The short answer is: “Try Before You Buy”. Make the wrong buying decision and you – and, more importantly, your customer – will be unlikely to meet key objectives such as improving Cooling Tower performance and increase productivity. Then there are the financial implications. Rather than achieving a satisfactory return on investment, your customer could be faced with the additional cost of rectifying any resulting problems. The point to bear in is that, as far as media is concerned, size – i.e. thickness – really does make a huge difference to performance and longevity. The 2H policy is to offer prospective customers media samples. However, if a supplier doesn’t take the initiative, we’d recommend asking them to provide samples of all media detailed in their proposal or specification.

Question: Replace lamella settlement tanks with a tubular system?

“Is there any benefit to replacing our current lamella settlement tanks with a tubular system?”


Answer: Yes, there is. TUBEdek offers better process efficiency than plate systems
because the tubes eliminate crossflow and eddy currents whilst maintaining
laminar flow. Speed is one of the most obvious – and important improvements.
In a traditional settlement tank or clarifier, the solids can travel virtually the entire length of the tank before settling at the bottom.


It’s a very slow process, sometimes wasting several, expensive hours. With a tubular lamella settlement system like TUBEdek, particles have only a short vertical distance to travel before they settle onto the face of the tubes and slide down to the bottom of the basin. This settling path is less than 100mm so it takes only a matter of minutes for particles to be removed from the flow stream.


As the particles settle onto the face of the tubes, they make very close contact which allows for agglomeration, further enhancing the rate of settlement. Larger clumps of the agglomerated particles settle out much more quickly than individual particles in standard settlement basins.

Question: How can I improve throughput for a horizontal lamella clarifier?

“We’re planning an upgrade at one of our municipal water treatment plants. We’re currently operating a horizontal lamella clarifier but there’s a bottleneck which is restricting throughput. We’d like to improve throughout and improve process control. What can you recommend?”


Answer:  Our DWI accredited [] TUBEdek™ Lamella Separation Tubular Settlers increase throughout, productivity and reliability when used in potable water treatment during the settlement process to remove solids from the raw water intake. The TUBEdek range, which is manufactured in PP, includes certified products for all potable water applications from Highland Whisky to tap water.


TUBEdek uses a “chevron plate” sedimentation process which is the most effective method of separating solids from the raw water intake. The uniform configuration and inclined angle of the tubes encourages laminar flow and more efficient solids separation whilst the “v” shape encourages the even discharge of the solids to the settlement zone below the TUBEdek modules.


TUBEdek provides many operational advantages:


.. Improved Economy from multiple sedimentation planes being housed in a single tank and therefore thus reducing the size and cost of tanks.


.. Significant process enhancements resulting from TUBEdek’s flexible design and interlocking profile which encourages laminar flow. TUBEdek can be adapted to meet any process design requirement by varying the inclination, length of tubes and module sizes.


.. Simpler installation, cleaning and maintenance due to the mechanical strength of the unique tongue and groove assembled system.


.. The industry’s most efficient lamella settlement process as each TUBEdek installation is customised to suit the application and deliver the required results.


.. Easy assembly is an added advantage in larger installations where TUBEdek modules can be built close or even adjacent to the site.