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Waste water treatment of fiberboard production plant (MDF)

Alexandropoulos Aristeidis

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Year 2019
Type of Item Diploma Work
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In the field of industry, the treatment of liquid and solid waste plays an important role. An important role for the smooth operation of each industry is the specialized treatment of its wastewater in order to meet the very high environmental standards for safe disposal of this waste. More specifically in the wood industry the treatment of wastewater has been a major problem for decades because of the high organic load included in the produced wastewater. In recent years through some special processes (MBR, DAF) and their introduction to the wastewater treatment plants of each wood industry the problem has been reduced. The bioreactor membrane (Membrane Bio-Reactor, MBR) is a modern technology that applies both to the treatment of urban wastewater and industrial wastewater. The arrangement of the MBR systems works either with a membrane immersed inside the aeration tank, or with a membrane outside the ventilation tank with a lateral flow. The membranes used are usually microfiltration or ultrafiltration. In these systems, due to the constant concentration of dissolved oxygen prevailing in the aeration tank generally high nitrification percentages are achieved, while for the complete removal of nitrogen is required the use of anoxic reactor in Which a denitrification takes place. The MBR technology has significant advantages over the method of active sludge and more specifically, it has to do with the best quality of outflow, the reduction of the required space and the smallest excess sludge etc. in this diploma thesis Experimental procedures were carried out in order to eliminate to a large extent the percentage of solids (TSS) as well as that of zinc contained in the effluent. What was observed through our experiments is that with the use of a anionic Polymer (coagulation) removes 98% of solids and 97% of the zinc concentration of our original specimens. Subsequent experimental procedures were also carried out for the reduction of the organic load of ammonia and nitrates in order to improve the operation performance of the WWTP in an MDF production plant (medium density fiberboard) where It was observed that for a further reduction of the quality characteristics of this liquid waste before entering the bioreactor membrane , the use of a flocculant(FeCl3) is necessary to reduce COD, TOC while for the reduction of ammonia the use of ozone deemed necessary.

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