Patent ID: 6086732
Filing Date: 2000-07-11
Classification: B03D,C02F

Abstract:
A flock separating apparatus for use in sewage or sludge treatment, comprising:an electrolytic cell and a separating tank, into which flock developed in the electrolytic cell is delivered and in which the flock rises up through action of a gas produced in electrolysis;the separating tank being a substantially vertical pipe assembly separated from the electrolytic cell;the vertical pipe assembly having an upper portion and a lower portion, said upper portion having a conical enlargement section with first and second ends, said first end having a smaller diameter than a diameter of said second end, said upper portion also having first and second telescoping sections, one of said first and second telescoping sections being attached to said first end of said conical enlargement sections;the vertical pipe assembly having a lower portion having an upper first section formed from at least a self-supporting net material, and having a lower second section attached to said upper first section, said upper first section attached to said second end of said conical enlargement section opposite from said attachment to said lower second section;diameters of said upper and lower portions of said vertical pipe assembly being in a range of 100-500 mm such that the diameter of said lower portion is less than a diameter of said separating tank by only a predetermined small value, said diameter of said lower portion being close in value to said diameter of said tank;said vertical pipe having a length in a range of 2000-10,000 mm, the length being at least 10 time greater than the diameter of said upper section;a supply pipe extending from the electrolytic cell to the separating pipe, the supply pipe opening below a mid-point of the separating pipe, said separating pipe having its bottom end connected to a treated-water receiving and discharge tank and its top end rising above a surface level of said receiving and discharge tank and being connected to a substantially horizontal flock discharge pipe provided with a conveyor, the flock discharge pipe being connected to a solids separator for removing liquid from the flock.