A complete wastewater treatment plant for a multinational pharmaceutical plant in Taizhou, Zhejiang Province, China was completed in December 2012. The plant was designed by the Portuguese company Valorsabio in collaboration with Shanghai MegaVision Membrane Engineering & Technology Co. Ltd. Implementation of the technology followed the successful completion of several months on-site testing for system optimisation, this being demanded by the complex and challenging nature of the industrial effluent being treated. The wastewater flow was around 400m³/day, according to 2010 data.
The retrofit solution makes use of the existing concrete tanks together with anaerobic pre-treatment with a UASB (Valorsabio UASB-PRO), implemented in November 2011, and aerobic treatment based on Valorsabio’s Jet-Loop System©. Membrane separation is based on Shanghai MegaVision FMBR-1.0-100 FS membrane panels. These are arranged in 12 modules containing 100 x 1 m² panels (and thus a flux of around 14 LMH at the flow of 400 m³/day) divided between 2 tanks. Further clarification by chemical coagulation/flocculation has been installed to remove non-biodegradable substances.
The UASB-PRO employs a new pulse process for the wastewater feed which addresses issues sometimes encountered in large UASBs relating to unbalanced feed distribution, short-circuiting inside the bioreactors and difficulties in stabilising the up-flow of wastewater within the design range. The anaerobic treatment reduces the COD loads by up to more than 85%, generating biogas which offsets the operating cost by its use for water heating.
The aerobic process operates at an HRT of less than 25% of the previously installed conventional activated sludge process. The COD is reduced from 1,300-1,400 to 600-800 mg/L.
The Coosur plant in Jaén in Spain generates an average daily effluent flow of 100 m³/day (120 m³/day peak) from olive oil production. A DAF process, pH-adjusted from 3.5 to 6.5 and dosed with coagulant and flocculant, is installed upstream of the MBR.
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An extensive pilot trial based on full-scale MBR membrane modules has been conducted by the Department of Environmental Engineering and Science, Chia Nan University, at an industrial site in Taiwan. The work included measurement of the sludge and foulant characteristics
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