Upgrading of sewage treatment plant by sustainable and cost-effective separate treatment of industrial wastewater.
The Olburgen sewage treatment plant has been upgraded to improve the effluent quality by implementing a separate and dedicated treatment for industrial (potato) wastewater and reject water. The separate industrial treatment has been realized within a beneficial public-private partnership. The separate treatment of the concentrated flows of industrial wastewater and sludge treatment effluent proved to be more cost-efficient and area and energy efficient than a combined traditional treatment process. The industrial wastewater was first treated in a UASB reactor for biogas production. The UASB reactor effluent was combined with the reject water and treated in a struvite reactor (Phospaq process) followed by a one stage granular sludge nitritation/anammox process. For the first time both reactors where demonstrated on full scale and have been operated stable over a period of 3 years. The recovered struvite has been tested as a suitable substitute for commercial fertilizers. Prolonged exposure of granular anammox biomass to nitrite levels up to 30 mg/l did not result in inhibition of the anammox bacteria in this reactor configuration. The chosen option required a 17 times smaller reactorvolume (20,000 m(3) less volume) and saves electric power by approximately 1.5 GWh per year.
Abma
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Paques BV, T. De Boerstraat 24, 8560 AB Balk, The Netherlands. w.abma@paques.nl
Driessen
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Haarhuis
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van Loosdrecht
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D003247:Conservation of Natural Resources; D005160:Facility Design and Construction; D007220:Industrial Waste; D012498:Sanitary Engineering / Q000191:economics* / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000191:economics / Q000295:instrumentation* / Q000379:methods; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods
D007220:Industrial Waste; D012722:Sewage; D014867:Water