The paper presents the results of an experimental pilot study on advanced flocculation of metal hydroxides that are precipitated from electroplating wastewater during pH-adjustment. A pipe-flocculator with a turbulent flow, to ensure proper mixing conditions, was used instead of a classical flocculation tank. The results of the study indicated a high efficiency of the process. The flocculation proceeded within 50-100 seconds, which was much less than is required during classical flocculation. Application of a pipe-flocculator results also in reduction of both capital and operating costs of the wastewater treatment plant.
In conclusions, important conditions, which are indispensable if pipe-flocculation is to be used, were formulated.
The paper presents the technology of volatile chlorinated and aromatic hydrocarbons removal and recovery. The study has been conducted at the Kanalstrasse installation in West Berlin. In the paper design, construction and operating problems have been described together with the results obtained during its over a year long performance.
An alternative cost analysis has been worked out for a currently designed installation at the municipal works in Saarbrücken. The two technological systems analysed featured:–stripping with simultaneous air-wash in a close cycle and recovery of hydrocarbons as a concentrated mixture–filtration and adsorption on activated carbon/including carbon regeneration/.
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