| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1984: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Research Abstract |
In this research, magnetic separation techniques such as High Gradient Magnetic Separation or magnetic flocculation, and their pretreatment methods were investigated to develop a rapid treatment process of industrial wastewaters and sewage. Main results and contents are as follows:
(1) The optimum pretreatment conditions of non-magnetic matters by combining the process of chemical coagulation and magnetic seeding were obtained, related with the results of magnetic separation of the produced magnetic precipitate.
(2) In the treatment of gas scrubbing wastewater from a municipal solid waste incineration plant by employing the combined process of CaSx process, magnetic seeding and HGMS, heavy metals, such as Hg and Cd, were successfully treated to below the effluent standards of Japan within a short processing time. The utilization of sedimentation process in the preceding step of HGMS treatment enabled the high efficient solid-liquid separation, because the specific gravity of produced mag
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netic precipitate was large.
(3) The magnetic flocculation of magnetic particles was considered to be effective in solid-liquid separation because the magnetic flocculation enhanced the settling rate of particles.
(4) The optimum operating conditions of Ferrite formation process was investigated in the case of cadmium solution. The produced particles were able to be removed easily by HGMS, even if they were fine and possessed low magnetization.
(5) Magnetic seeding material (magnetite) was able to be recovered by agitation in a vessel and one pass to HGMS equipment in high speed under acid or alkaline conditions.
(6) The theoretical behavior of particles captured, not only on a clear wire or ordered array of wires, but also on a wire in build-up process of particles, was compared with the results observed experimentally by using a TV-camera. The saturation value of particle quantity built up on a wire was able to be predicted by a force balance model of a particle, taking into account the coefficient of friction as a parameter.
(7) It was found by trajectory analysis that the removal efficiency of particles by ordered array of wires was able to be represented by substituting that calculated on a wire, in cases where the packing ratio is less than 3%. Less
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