SU707894A1 - Thermal method of rendering harmless waste water - Google Patents

Description

I

The invention relates to the protection of the environment and can be used in all production branches, the activity of which leads to the formation of liquid effluent.

Methods and devices for thermal disposal of wastewater are known: evaporation in evaporators of the depletion type, combustion in chamber, mine, cyclone and other furnaces 1.

The disadvantage is the impossibility of using the known methods and devices for the disposal of highly polluted effluents that are capable of foaming, with a high content of mechanical impurities, sludge.

A known method of thermally treating wastewater from surface-active substances (surfactants) by burning a flotation condensate and a device for carrying out the method consisting of a closed aeration tank and an open compartment adjacent to it for burning foam 2.

The formation of foam in the aerator is achieved by forcing air through a tray laid out

; Porous gshitkami. A jet of compressed air on top of the foam is blown off into the burning compartment {w, where it collapses, and the resulting droplets of the flotation condensate are combusted with the fuel.

The disadvantage of this method is that it allows to destroy only surfactants passing into the flotation condensate and an insignificant part of mechanical impurities, and the main part of mechanical impurities remains in the waste water, since the destruction of surfactants also eliminates its flotation properties. The arrangement of the aeration tank and the combustion compartment on one level of the device necessitates the provision of additional measures for organizing the transport of foam to the combustion zone.

The purpose of the invention is to increase the efficiency of the process.

This is achieved by foaming waste water with a combustible gas in the presence of surfactants followed by burning the resulting foam.

The invention is illustrated in the drawing.

The installation includes a foam detector apparatus consisting of Konoinibi i, grating 2

and drain hopper 3; an combustion chamber consisting of a housing 4, an air distribution grill 5 and an air chamber 6, auxiliary equipment consisting of a reservoir 7, a fan 8, a duty torch

9.

The wastewater to be treated receives 6 tank 7 for pre-treating the surfactant in an amount necessary to completely convert the entire volume of waste water into foam. From reservoir 7, they enter the foam generator apparatus at grid 2. At the same time, under grid 2, the so-called. Combustible gas is supplied to the drain bin 3. The gas passes through the grid 2 and, by bubbling through the sewage layer, forms a statically stable cellular foam that moves in the column towards the combustion chamber. Due to the flotation properties, foam is entrained and solid impurities are fed into the combustion chamber. If necessary (for example, an emergency stop of the process) from the drain bin 3, the waste water in the apparatus can be drained and then returned to the disposal cycle (into the tank 7). The required air is supplied to the combustion chamber from the air chamber 6 through the air grill 5 by the fan 8. to ensure stable gas combustion together with foam. To ignite, a combustible gas is fed into the combustion chamber, which, when burned in the pilot flame 9, heats the refractory lining of the chamber to the required temperature. The strongly developed contact surface between the flue gases and the bubbles of the statically stable cellular foam, into which the waste water is converted, determines the high intensity of the mass transfer. The foam quickly evaporates, releasing the gas trapped in its belly and above the exit from column 1, a stable flame is formed. Combustion products from the chamber can be sent to appropriate facilities to remove solid particles from them and recover heat and condense moisture.

Example. Thermal neutralization receives wastewater containing 184 g of dry matter per 1 liter of wastewater, including 60 g / l of organic matter, 74 g / l of mineral salts and 50 g / l of insoluble impurities. With the addition of 2.0 g / l of surfactant to the wastewater (siptanol of DS-10) and gas bubbling, the waste water is completely transformed into foam and is burned in the combustion chamber.

The use of the method of thermal neutralization of wastewater makes it possible to carry out effective neutralization of highly contaminated substances; liquid liquid drains regardless of their ability to foaming, scale formation, on the content of impurities of inorganic salts, solid particles, sludge, etc.

Claims (2)

1. Bogushevska K.K. and Pep Ptynnyi G.P. Thermal Methods of Waste Disposal. L., Himi, 1975. 2.Klein S. A., Ms Gayhey, R.N. - Journal Water; Pollut Control Feder., 1963, 35, N 1, 110 (prototype).