SU733514A3 - Method of purification of waste liquor - Google Patents

Abstract

1458302 Waste water aeration STAMICARBON BV 25 Jan 1974 [29 Jan 1973] 03656/74 Heading B1C In a process and apparatus for the aeration of waste water containing suspended biologically active sludge, jets of recycled water are directed at an angle of not greater than 60‹ and at a velocity of from 3 to 12 metres/ second onto the surface of the waste water which is contained in a basin of circular, elliptical or regular polygonal horizontal crosssection, whereby aeration of the water and a rotary flow Vr is produced. In Fig. 1, two tubes 2, 3 having outflow openings 6 direct the jets of water onto the waste water in circular basin 1. Untreated water is introduced at 4 and treated water leaves at 5 while pump units 7 draw water from the basin and feed it to the tubes. In Fig. 2 the pump units include an impeller 11 driven by motor 13. Some of openings 6 may be blanked off to vary the output and the angle of the jets may be varied in an arrangement of relatively rotatable apertured pipes 100, 104 shown in Fig. 3. The output of the jets may be varied by changing the speed of motor 13.

Description

The invention relates to the treatment of wastewater containing activated sludge in the form of a suspension, in aerotanks with surface aeration, specifically in cylindrical aerotanks. Wastewater treatment methods are known, in which surface or mechanical aeration is carried out with the help of vertical or horizontal brushes or propeller arms, which simultaneously mix wastewater with an active clone 1, Energy costs when using these cleaning methods are large, wastewater treatment, including their aeration and jet mixing with water supplied at an angle to the surface of the wastewater in the aeration tank of cylindrical forms 12. One; Nogo method exists, although provides good aeration of sewage, but requires dopa tional mechanical device for mixing the waste water with activated sludge which significantly povy creases economic costs and reduces process efficiency. The aim of the invention is to increase the efficiency of the process. To achieve this goal, the angle of the jet of aerating water is 10-60 °, and the feed rate is 3-12 m / s, and the direction of the supply of aerating water and the main flow of water in the aeration tank coincide. figure 2 - section aa of figure 1. Aerotank 1 has a cylindrical shape and is equipped with pipelines 2-4, respectively, for supplying aerating water, supplying wastewater and draining purified water. Adjustable apertures 5 are made on the pipeline 2 for supplying aeration water. The position of the CN indicates the direction of the main water flow in the aeration tank. The jets of aerating water are supplied from holes 5 located at a certain height above the surface of the water in the aeration tank and form a certain angle relative to the surface of the water to be purified. The amount of oxygen introduced is due to this angle and is regulated by changing the position of the outlet 5. The higher the output velocity of the water jets, the more intense the

cleaning process. However, energy costs also increase proportionally. The optimal speed range at which energy costs are taken into account, sufficient introduction of oxygen and ensuring intensive

mixing waste water with active 4 sludge lies within 3-12 m / s

The angle of the supply of aerating air, water and its feed rate to the cleaning efficiency is given in the table,

Claims (1)

Experiments 7-11 were given for comparison. The data of experimental studies of the proposed method showed a significant increase in the efficiency of wastewater treatment within the indicated limits of the feed angle and the speed of half of the streams of aerating water. DETAILED DESCRIPTION OF THE INVENTION Wastewater treatment method, containing activated sludge as a suspension, in a cylindrical aerotank by aeration with water jets directed at an angle to the surface of the waste water in the aeration tank, characterized in that water is fed at an angle of 10 to increase the process efficiency -60 at a speed of 3-12 m / s in the direction of the main flow of water in the aeration tank. Sources of information taken into account in the examination 1, Shishkin Z.N. and others. Sewers. M ,, 1960, pp.425-426, 2, Patent SCHR No. 56763, cll2 e 4/01, 05.05.72 (prototype).