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Every year Veolia Water Solutions & Technologies present new innovations and technical expertise to the industry. Veolia are a leading company in the drive for sustainable development and invest significantly in technology for the future. Below you can view technical papers presented at numerous industry events and abstracts for paper coming up...
There are now two Bioenergy and water recovery plants installed by Veolia on Distilleries in Scotland, both of which are operated by Diageo. One is on a 12.6 mla malt distillery and the other is on a 105 mla grain distillery. This paper will discuss the technical issues that have had to be overcome with these being the first Bioenergy facilities producing energy from distillery co-products. It will also present the different technological approaches due to the scale of the two plants and the technology applied to both recover Bioenergy and to produce clean water that can be re-used.
The processes for both facilities are split into preparing a biomass for burning in a boiler and the subsequent aqueous treatment. The first stage of aqueous treatment removes the majority of the pollution from the liquid though anaerobic treatment, producing valuable Biogas, a methane rich gas. The water is further purified through an aerobic membrane bio-reactor. For re-use an additional Reverse Osmosis stage is applied.
Some disposal routes have become non-viable whilst some treatment processes, which were previously uneconomic, have now become attractive.
One such process is thermal hydrolysis, which has the greatest economic impact before anaerobic digestion. The objective of the process is to hydrolyse organic solids to make them more soluble and more readily biodegradable, reducing hydraulic retention time in the downstream anaerobic digester. The benefits are significant and energy recovery is optimised in the form of biogas from biological sludge digestion.
However these processes lead to the generation of N-rich sidestreams which could reduce the energy benefit and the overall WWTP sustainability if they are treated on the mainstream due to increasing aeration and carbon substrate requirements. Therefore, energy- and cost-effective biological treatment dedicated to these sidestreams is recommended. In this paper, we are presenting two novel sidestream processes: A 1-stage deammonification MBBR process called ANITA™Mox for autotrophic N-removal and an SBR process called ANITA™Shunt for N-removal via the nitrite pathway with advanced control system to minimize N2O emission. After two years of pilot testing, both processes have now been implemented at full-scale level with one ANITA™Mox plant in operation in Sweden treating around 200kgN/d (second plant under construction) and one ANITA™Shunt plant treating 160kgN/d soon to be started in France.
In November 2007, S3JV were awarded the Shell Green Extension Contract, valued at over £94 million, works that included the expansion of the existing facility by the construction of a 3rd incinerator stream:
