| SEWAGE & SLUDGE TREATMENT


Plastic pipework was embraced as part of an upgrade to Mogden Sewerage Treatment Works in Isleworth. David Naylor explains how plastic systems simplify the installation process and prevent fuel leaks


Durable plastic solution


WATER TREATMENT plants, particularly within sewage treatment works (STW), rely on pumping stations to ensure water is effectively treated and discharged.


If a pump station fails for any reason, this can poten- tially be extremely dangerous, putting the safety of both the environment and the public at risk, as well as causing un- expected


replacement costs.


In extreme cases there is the possibility of hefty fines for


the effected water authorities. The potential hazards include untreated sewage being dis- charged into rivers, estuar- ies or coastal waters prior to reaching treatment facilities, damaging the environment in- cluding fish and other aquatic life. This can happen for a number of reasons includ- ing infiltration of excessive stormwater into sewer lines during heavy rainfall, damage or blockage of the sewerage lines or a power failure at the


pumping station. The Urban Wastewater Treatment Direc- tive (UWwTD) is in place to protect the environment from the adverse effects of untreat- ed wastewater and sets out minimum


requirements for


the treatment of significant sewage discharges.


The Environment Agency (EA) has responsibility for monitoring discharges from treatment plants for com- pliance with the directive’s treatment standards. If these


standards are not met, the EA can enforce the water com- pany to make improvements that will bring it into compli- ance. With water authorities facing significant consequenc- es for untreated sewerage be- ing discharged, it


is crucial


that treatment plants do all they can to protect themselves from a failure in the pump- ing station. One key element is to ensure pumping stations have a reliable back-up power supply system so that if mains


power fails for any reason, the pump station equipment can continue operating without the fear of untreated sewage infiltrating the environment. Despite


these emergency


back-up systems being vital if called upon, they often not given enough consideration at the outset of a project and only thought about once a problem occurs. Durapipe UK is advising that more attention is required in the specification of back-up fuel systems.


Fuel-powered generators


are popular systems of choice to provide power if the main power source fails. They func- tion with a pipework system transporting fuel to an emer- gency generator, which will then provide a temporary power supply while the main system is repaired or replaced. For fuel supply applica- it


tions, is important that


contractors specify secondary containment systems due to the potential safety hazards


Ukrainian job Screenings Handling


HUBER Technology are able to offer high quality solutions for all your waste water treatment needs for both the mu- nicipal and industrial markets.


Screens Disc Filters


The large and diverse product range includes inlet screens, screenings han- dling, storm screens, sludge thickening and dewatering, grit removal and wash- ing and disc filters.


HUBER Technology are able to custom- ise all products to suit individual require- ments and specifications.


Sludge Grit


Units C&D Brunel Park ● Bumpers Farm Ind. Est. ● Chippenham ● Wiltshire ● SN14 6NQ Tel: 01249 765000 ● Email: hr@huber.co.uk ● Website: www.HUBER.co.uk


14 | WET News | July 2012


BERSON HAS supplied two InLine+ UV disinfection sys- tems to the wastewater treat- ment plant (WwTP) in the Ukrainian city of Chernihiv. The Berson UV systems dis- infect effluent prior to its dis- charge into the Desna River. “Disinfection is necessary to meet Ukrainian bathing water standards and also to prevent effluent with high microbial loads of pathogenic viruses, parasites and bacte- ria entering the Desna River, which is also the main water supply for many communities downstream, including Kiev,” says Chernihiv’s waterworks director, Sergey Shkin. He adds: “Chemical dis- infection with chlorine was not an option as we wanted to avoid unpleasant disinfec- tion by-products such as tri- halomethanes (THMs) and Halogenated Acetic Acids


(HAAs), which are produced when chlorine reacts with the organic compounds in waste- water. Furthermore, as chlo- rine is a dangerous gas, ad- ditional safety measures are required to comply with rules for its transport and storage and for worker safety – these all carry additional costs. “These factors, together with the fact that many dan- gerous bacteria and parasites, such as Cryptosporidium and Giardia, are resistant to chlo-


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