RU2355642C2 - Method of waste water treatment - Google Patents

Abstract

FIELD: treatment facilities.

SUBSTANCE: invention relates to the methods of clarifying industrial water from solid suspensions and can be used to treat water in horizontal open settling basins of mines, dressing plants and industrial enterprises. Waste water is supplied to an open water receiver where upfloat of light components, settlement of heavy components and discharge of the clarified water take place. The open water receiver is divided by floating baffles into three sections: inlet, intermediary and outlet ones. The waste water is cooled in the inlet section after the light components have come to the surface and the heavy ones have been settled. The bottom cooled water is bypassed under the floating baffle to the following sections where the suspended particles with the density exceeding the water density are precipitated from the cool water.

EFFECT: invention allows for increasing the efficiency of the waste water treatment implying removal of suspended particles and impurities with the density greater and smaller than the water density.

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Description

The invention relates to methods for treating industrial and waste water discharges and can be used in various industries for purifying water from impurities with a specific gravity lower and higher than water, as well as suspended solids.

A known method of treating industrial wastewater [1], including the supply of wastewater through one of the end walls of the horizontal sump and dumping it through a collector at the opposite wall. The disadvantage of this method is the low efficiency of the process of gravitational deposition of finely dispersed solid suspended particles and impurities having a comparable specific gravity with water, which are practically not deposited and are discharged in transit into external water bodies in excess of the maximum permissible concentrations.

Known gravity sedimentation tanks of the American Petroleum Institute [2], including the supply of effluent, separation of petroleum products and impurities by density, the removal of oil droplets mechanically in the enclosed cavity with sealed partitions, the accumulation of impurities in the sump of the sump.

The disadvantage of the analogue is the distribution of petroleum products by the volume of the sump, which are collected mechanically and forcedly fed under the jumper installed at the mirror of its water.

A known method of wastewater treatment at large oil depots [3], adopted as a prototype, including the supply of wastewater to a horizontal sump, divided into sections by vertical partitions installed at the beginning and at the end of the sump on the water surface. Pop-up contaminants are collected from the water surface 3-4 times a day by side discharge, and the sediment is removed from the sump of the sump once a day.

The disadvantages of the prototype are the pollution of the water of the sump throughout its volume, the lack of regulation of the intensity of sedimentation of suspended particles and the volume of supply of water discharges, there is no accounting for the stratification of water in the sump by temperature gradients, which determines the change in its density in depth.

The task of the invention is to increase the efficiency of purification of water discharges from suspended particles and impurities with a density higher and lower than the density of water.

The solution to this problem is achieved by the fact that the open water inlet is divided by floating partitions into three sections: the inlet, intermediate and outlet, in the receiving section, after the floating of light components and the deposition of heavy components, the discharge water is cooled, and the bottom cooled layer of water is passed under the floating partition into subsequent sections, in which a suspension of suspended particles with a density greater than the density of water occurs from a layer of cold water.

The invention is illustrated by drawings, where figure 1 and 2 shows a horizontal sump, top view and side view, figure 3 - section aa of figure 2.

The open water intake 1 (FIGS. 1, 2) represents a pond of arbitrary shape, which is divided by partitions 2 into three sections: a receiving C ₁ , an intermediate C ₂ and an exhaust C ₃ . The floating partitions 2 are kept afloat by buoys 3 and have a separator 4, and the buoys are connected by cables, the ends of which are fixed on opposite sides of the reservoir 1.

In the reception C _{1 there} is a spillway of polluted water 5, and in the exhaust C ₃ section there is an exhaust manifold 6.

The immersion depth of the partitions is selected from the conditions of laminar water movement in the sections of the water intake and in the section under the floating partitions.

The expected effect is obtained due to the forced lowering of the heavy components of discharges into the bottom layer, gravitational deposition of suspended particles in a thin cold bottom layer of water and the exclusion of thermal ascending water flows in the intermediate section.

LITERATURE

1. Abramov N.N. Water supply. - M.: Stroyizdat, 1974. - p.137-138.

2. Improvement of wastewater treatment methods containing petroleum products. / S.A. Bobrovsky, G.A. Roev, and others .-- M.: VNIIONG, 1976. -p.30-31.

3. Royev G.A. Treatment facilities of gas and oil refining stations and oil depots. - M .: Nedra, 1981. - p.137-138.

Claims (1)

A method for cleaning water discharges, including separating sections in an open water inlet by separating partitions, supplying discharges, cooling the discharges, stratifying the components contained in the discharges, by density, floating of light components, precipitation of heavy components and discharge of clarified water, characterized in that the open water inlet is separated by floating by partitions into three sections: receiving, intermediate and exhaust, in the receiving section, after the ascension of light components and the deposition of heavy components, cool the discharge water, and idonny chilled water recirculation under the floating layer partition in the subsequent section in which cold water from the layer occurs sedimentation of suspended particles with a density greater density of water.

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