GROUNDWORKS & DRAINAGE 53
A more modern way to manage wastewater
David Stagg from Graf UK explains why innovative sequencing technology is the way forward for efficient wastewater management in developments
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utrient neutrality that requires reductions in nitrates and phosphates, reducing ammonia levels in the effluent and carbon dosing – the world of wastewater treatment has become a dynamic, complex, and challenging one.
No longer is it just a choice between cesspool, septic tank, or wastewater treatment plant. Now there are options for wastewater treatment plants too – between conventional flow/activated sludge systems and those that employ advanced sequencing batch reactor (SBR) technology. One of the main differences between these systems is that SBR combines several processes during the treatment cycle in a single treatment zone, in a chronological sequence which means a clarifier/secondary chamber is no longer required. SBR systems run in batch cycles which generally operate twice or four times every 24 hours to ensure the treatment process is identical every time to produce high-quality effluent.
Continuous flow systems operate on a “what goes in, comes out” basis, so during periods of heavy loading/inflow the effluent travels through the system much quicker, potentially reducing the effluent quality. The technology around SBR was implemented decades ago in Scandinavia, where reducing and monitoring phosphate and nitrate levels is common practice. More than 5,000 wastewater treatment systems with this technology have already been supplied throughout Europe to meet these challenging discharge constraints, achieving an independently tested 0.4 mg/l of phosphate removal with dosing and 1.6 mg/l without dosing for domestic systems up to 50 populations. Denitrification is used to reduce nitrates, achieving 7.9 mg/l. Larger population requirements would be designed individually.
ADF MARCH 2024
The system of choice The SBR process is a modern method for cleaning wastewater. Due to its many advantages – its operational flexibility and excellent process control possibilities – combined with the need to meet the increasingly stringent environmental discharge standards, it is becoming the system of choice for UK designers/specifiers and consultants.
Bespoke designs utilising advanced SBR technology are allowing these influencers to meet requirements for decreasing discharge levels of phosphate, nitrate, ammonia, biological oxygen demand (BOD) and suspended solids (SS). They also bring potential design solutions for more challenging applications such as breweries, distilleries, dog kennels, dairies, and chicken farms.
SBR technology can be employed in recycled and recyclable plastic or precast
WWW.ARCHITECTSDATAFILE.CO.UK
The many advantages of the sequencing batch reactor (SBR) process for cleaning wastewater mean it is becoming the system of choice for UK designers and specifiers
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