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WATER PAGES


drain TRADER


Of course,with theCovid-19 pandemic leading to urgent reviews of business continuity plans, it seems good practice to assign this responsibility to a teamrather than an individual, so the knowledge is not lost if one person becomes unavailable


Testing and trials


Performance and commercial shocks caused by discrepancies between designs and the delivery of a project can be avoided by conducting detailed reviews and pilot trials ahead of installing permanent plant. WPL can undertake in-depth advance testing in twoways - laboratory testing and onsite pilot trials.


Industrial laboratory service


Bespoke lab-scale reviews are conducted atWPL’s in-house facility to ascertain the profile of the effluent and ensure that the correct dosing regime is implemented, based on the requirements of environmental discharge permits.WPL’s process scientists carry out a separation test on effluent samples fromthe specific site and replicate appropriate treatment processes fromWPL’s rangewhich includes dissolved air floatation (DAF), biological treatment and settlement options. Depending on the specific consent requirements, scientists can monitor chemical oxygen demand (COD) and biochemical oxygen demand (BOD) and levels of pollutants such as greases, phosphates, nutrients and nitrates to see if they are achieving the separation required. Based on the analysis, a report is produced that determines the best technology and cost of the final scheme.This kind of testing has a quick turnaroundwith results returned in about aweek. It causes little disruption to the customer and allows designers to rule out different technologies, saving time in researching options thatmight notwork.


Onsite pilots


Following a lab review, an onsite pilot project is usually recommended to identify the precise equipment required. Pilots allowengineers to really look closely at factors including chemical and power consumption and sludge production to give a very accurate indication


46 drain TRADER | August 2020 | www.draintraderltd.com


of howthe plantwill operate and the costs, giving the customer confidence that therewill be no surprises.They can seemexpensive, but theymay savemoney in the long run. WPL recently built a permanent dissolved air flotation (DAF) unit on the site of a foodmanufacturer,which onlywanted a lab reviewand not a pilot. It transpired the effluent being dischargedwas different fromthe sample given for lab testing – the sugar content differed vastly and could not be effectively removed. Samples are variable in industrial treatment and the pilotwould have picked this up very quickly, saving the customer time andmoney.An additional biological treatment plant has since had to be installed on the site.


Repurpose existing equipment


The solution to failing consentmay not always require a large investment or the rebuilding of infrastructure. Inmany cases, just a single piece of equipment is needed, or,where an existing piece of kit fails, it can often be repurposed. WPL’sHybrid-SAF™is a highly efficient biological treatment technology with custom-built cells can be retrofitted into any onsite vessels regardless of shape or size.This can improve the process to give it a 20- year life expectancy tomeet consent and is significantly cheaper than rebuild projects.


Staff training


Of course, the solution to consent failuremay not even be engineering- based. It can be a case of better stafftraining and revamped internal policy. For example, in the food industry, breaches can occur because employees are not scraping utensils before theywash them,meaning food debris and greasewashes into the public sewer – resulting in a breach. Education and ongoing training can really help prevent equipment and processes breaking down, ensuring the treatment plant remains fully compliant and continues to protect the environment.WPL can offer advice on all of these issues and support companieswho are concerned about onsite treatment facilities failing consent.


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