New £1 million Industrial Wastewater Treatment Plant

H+E have recently currently designed & built a Treatment Plant to handle wastewater from a process plant that uses a mixture of highly concentrated acids including Hydrofluoric and Nitric acids, and also contains a range of soluble metals. It can also be too warm to discharge directly to sewer.

This sensitive application has demanded that all equipment within the overall plant be both designed and manufactured to an unusually high standard, with a target 40 year minimum design life. It also includes the supply of documentation to a very high standard.

 The Solution: This involves neutralising the wastewater with calcium hydroxide in order to precipitate the fluoride as calcium fluoride. The pH of the incoming wastewater can be very low (less than 1) so the neutralisation is done in two separate steps, after which the solids produced are flocculated before being separated from the wastewater in one of our Tube Settlers, a highly efficient lamella clarifier design that has been a standard product used in literally hundreds of applications.

 Following settlement, the clarified wastewater flows into a TOVEKO continuous gravity sand filter, the purpose being to remove any final traces of fine solids that were not removed in the Tube Settler. Then the wastewater is cooled if necessary, and has its quality monitored continuously before being mixed with various other non-toxic wastewater streams being discharged from the site. The final, mixed wastewater stream then has its quality monitored again before being discharged to foul sewer.

 The sludge formed by the settling solids is transferred to a separate sludge holding tank, which automatically removes excess water that accumulates as the sludge settles further in the quiescent conditions provided, before it is finally pumped from the tank for final dewatering, producing a solid that can be disposed off-site.

 The plant’s control system is unusually sophisticated, and features a far greater degree and depth of continuous control and monitoring than is normal for this type of wastewater in a more “standard” industrial environment.

 Pre-assembly: The plant was manufactured, pre-assembled and Factory Tested to a very high level prior to being delivered to site. Pre-assembly has been an integral part of our culture for a substantial time now, mainly because it enables us to control the quality of what we deliver and also because testing in our factories is so much more efficient than doing so on site.

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