- Low-head circular tank
- Bottom sediment removal system
- System of continuous cleaning of the inside wall
- Inspection window for checking the floatation
- Automatic control of the thickness of the floated matter (upon request)
System advantages – mitasat
- High saturation efficiency (> 90 %)
- Complete dissolving of the injected air
- Automatic control of the injected air
- No excess air relief valve
- Paper mills: historically paper mills represent one of the first applications of dissolved air floatation systems. mitadaf floatation units are employed in paper-works for two different applications. The principal usage it’s a unit of the production process itself: mitadaf allows the user to recover most of the paper fibres which constitute the raw material and which would otherwise be lost in the washing water of the sheets. On the second place mitadaf is employed for the treatment of the waste water, especially for the removal of the suspended solids and of the COD associated with them. In both cases mitadaf is the ideal solution for optimising the recovery of solids thanks to the efficiency of its (own) air dissolving system. The vast range of models which MITA Water Technologies has available means that the requirements of both the smaller and of more significant installations can be satisfied.
- Biscuit factories and confectionery production plants: one of the principal applications of the mitadaf floatation system is the pre-treatment of the waste water discharged from biscuit factories and confectionery production plants. The different production lines are subjected to frequent washing because of hygienic questions, and when products with different features are manufactured. The process water of biscuits and confectionery production plants are characterised by a high content of suspended solids, COD and greases. mitadaf, used as pre-treatment upstream of biological water treatment, or prior to discharge to the sewer, allows a substantial reduction on the levels of such parameters. This then permits the reduction of the dimensions and the optimising of operation of any eventual biological treatment plant downstream. Alternatively, a lower load of pollutants permits the users to discharge their waste water directly to the municipal sewer network, by reaching the limits defined by the directive 91/271/EC. mitadaf, thanks to its limited dimensions, can be readily sited even in small layout spaces. No specialist personnel is required for the operation of the plant because of the simplicity of its operation and management.
- Salami factories: waste water from salami factories contains high concentrations of fats and suspended solids, derived from the preparation and bagging process of the meat. The presence of these substances can create problems for the biological waste water treatment plant; the fats inhibit the development of the bacterial treatment and the highly pollutant loads require a treatment plant of large size with long residence times of the effluent water in the biological treatment tanks. In this context mitadaf intervenes on both fronts. Employed as pre-treatment, it allows extremely high efficiency of removal of fats and suspended solids, thanks to its innovative air dissolving system.
- Primary and secondary clarification for biological treatment plants: mitadaf works as an application for the clarification phase in biological treatment plants of all capacities. Thanks to its high efficiency of removal of suspended solids, mitadaf is useful for the primary clarification of the effluent water since it permits the use of extremely limited spaces. The efficiency of solids removal is so high that the sizing of the subsequent treatments is drastically reduced. For the same reasons it is also applied for secondary clarification, with a further advantage: the sludge extracted from the floatation unit has a density which is approximately the double of the sludge extracted from a traditional sedimentation system. This allows a reduction in the costs of the sludge disposal or of the introduction of any sludge treatment line. Moreover the recirculated sludge is denser, with obvious savings on the quantity recirculated and consequently in the sizing of the oxidation tank.
- Dairy and cheese industries: this is an application very similar to that of the salami factories. In these industries washings occur very frequently and their wastewaters are rich in fats and highly biodegradable solid substances. The pollutant load is very high and the treatment of such water requires the construction of large plants even when the flowrates in play are relatively small. In this context mitadaf is widely applied as pre-treatment. Its limited dimensions allow it to be installed also on existing plant or in any case where layout problems exist. The dissolved air rapidly carries solids and fats to the surface, without problems with unpleasant odours and with an extremely high efficiency of removal. This permits a reduction in pollutant load and hence in the dimensions of the whole installation. mitadaf is often also used in existing plants which must be upgraded.
- Petroleum industry: petroleum depots and refineries are large industrial complexes. The rain water falling in the yards and on plant buildings and the resultant run-off water must necessarily be treated before discharge. To these are added water from pipe-cleaning and wash-water in general. The particular property of this water is the presence of oils in considerable quantities. mitadaf represents an efficient solution for their removal. In favour of floatation can certainly be cited the removal efficiency, the small layout requirement and the possibility of inserting the unit in an existing installation. If the end-user is already equipped with his own biological wastewater treatment plant, mitadaf allows an increase in its efficiency by removing upstream all the substances which could inhibit the correct operation of the biological process.
- Textile industries: the water leaving these plants are rich in fibres which are released by the various washing processes to which the raw wool is subjected. The raw material is rich in solids, greases and organic substances, which are carried away by the wash-water. In this same water are also to be found abundant quantities of surfactants derived from the detergents used for washing. mitadaf has proved to be an efficient solution for the treatment of this water upstream of any biological and/or physical-chemical process. It allows the removal of about 80% of the greases and solids contained in the water, and also effects a partial reduction of the surfactants associated with the latter. The micro-bubbles of air which are generated in the saturator and are released in the floatation tank are so fine that they do not cause any foam formation despite the high surfactant concentrations.
- First fall rain water: the run-off water from courtyards, car parks and depots must necessarily treated prior to being channelled to the drains. Such water is principally rich in particulates, oils derived from motor cars and mechanical equipment and in suspended solids. The quantities of water involved are very high and totally unstable, both in their frequency and their intensity, since they are linked to meteorological activity. In these cases the optimum solution is to provide for storage of a capacity such that it can hold all the water to be treated, which then be handled later. For the removal of oils and suspended solids mitadaf constitutes the optimum solution. Its limited size, the ease of siting and of operation and the high performance in reducing solids and oil concentrations are such that the effluent leaving the unit can be channelled directly to the final drainage, where compatible with the relevant standards in force.
- Upgrading of existing floatation units: all the MITA Biorulli mitadaf floatation units are equipped with an mitasat air saturator, which is the heart of the floatation process. mitasat permits the creation of the air-water mixture necessary for floatation. In addition to our floatation units, we supply mitasat separately for the upgrading of existing floatation units, with the aim of maximising their performance. The high dissolving efficiency of the air in the water allows maximisation of the performance even of equipment that were not manufactured by us. Moreover, mitasat uses all the compressed air which is introduced into it, thus giving rise to a significant saving.