Yara Industrial GmbH

Bad Hönningen, Germany

Yara Industrial GmbH

Bad Hönningen, Germany
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Franke W.,Yara Technology Center | Ettl M.,Yara Industrial GmbH | Corben T.,Yara Benelux | Kuhn G.,Yara Industrial GmbH
Water Practice and Technology | Year: 2012

Sewer network odour emissions have become a focus due to environmental regulations and, in the case Hydrogen Sulphide (H2S) induced corrosion, due to safety and sustainability. For these reasons the establishment of emission treatment is recommended. Sewer emission treatment focuses on local solutions rather than sewer-wide network treatment. The dosing of chemicals for this purpose is usually done section-wise. Obviously there is optimization potential when sewers are understood and treated as networks. Preventive treatment can be optimized by information from downstream and curative treatment by information from upstream. Such concepts demand communication technology and monitoring of several parameters at various locations in the sewer network. In the presented case study a digital communications network is used to control H2S emissions and fat, oil and grease (FOG) disposal in a sewer network. Moreover it was shown that technical solutions are available to use sewers as controlled reactors rather than just let them be a source of problems. An overview of today's standard dosing systems and strategies for odour and corrosion control is also given. © IWA Publishing 2012.


Franke W.,Yara Technology Center | Ettl M.,Yara Industrial GmbH | Roldan D.,Czech University of Life Sciences | Kuhn G.,Yara Industrial GmbH | And 2 more authors.
Water Practice and Technology | Year: 2011

Disposal of fat, oil and grease (FOG) in sewer systems cause blockages, fatal errors of pumping stations, increased maintenance, odours, hydrogen sulphide (H 2S) emissions and corrosion. Hence, solutions to prevent FOG disposals are desirable. Challenges are prevention of FOG contamination of sewer systems and removal of FOG disposals. A survey and lab as well as full scale tests were performed. In the first place fat traps and grease inceptors should be installed to prevent FOG contamination what is documented as being very effective. A case study shows that the operation of fat traps may indeed produce further problems, especially H 2S emissions, what demands an additional treatment. Removal of FOG disposals can be handled by applying enzymes to the affected sewer network. It was found that enzymes are preferable towards surfactants to remove FOG disposals. It appears to be a solution to have one dosing site that is equipped with separately controlled dosing pumps for conditioners for H 2S removal as well as FOG removal. © IWA Publishing 2011.


Franke W.,Yara Technology Center | Granli T.,Yara Technology Center | Kuhn G.,Yara Industrial GmbH | Bakke R.,Telemark University College
Chemical Engineering Transactions | Year: 2010

Waste water systems tend to be a source of odours as a result of transporting odorous substances as well as sewers being large biochemical reactors. Waste water in pressure mains and long non-turbulent gravity sewers turns anaerobic if not conditioned. The result is hydrogen sulphide (H 2S) and odorous volatile organic compounds (VOCs) emissions. These emissions must be controlled and limited to comply with environmental legislation as well as safety demands. A common method to reduce the emissions is dosing chemicals into the wastewater resulting in changed conditions, altered microbial activity and stimulation of oxidizing reactions. Chemicals for this purpose have to be tested and approved before use in order to make sure that technical effects, ecological compatibility and costs (customer & producer) are beneficial. For such investigations we have developed a three step investigation procedure: 1. Testing chemicals in simultaneously run batch tests. 2. Testing chemicals in a continuously fed loop reactor. 3. Field testing in a large scale sewer under well known conditions. Synthetic wastewater is used for the first and second steps. Step 1 of the investigation is the focus of this paper. The developed method uses 250 ml reactors with biofilm carriers and constant stirring. Waste water is changed periodically. The main target of the method is the comparison of different chemicals and dosages of these. Several parameters are investigated including headspace H2S analysis. Experimental results demonstrate that the method clearly distinguishes effects of different agents and dosages of these. Copyright ©2010, AIDIC Servizi S.r.l.

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