LT5797B - Process for treatment and decontamination of sewage - Google Patents

Abstract

The present invention relates to the treatment of municipal, industrial and livestock sewage by use of cavitation technology as well as to diminishing microbial contamination in wastes.@

Description

The invention relates to liquid and liquid cavitation treatment technology for wastewater treatment of municipal, industrial and agricultural livestock complexes, as well as to the reduction of microbial concentration in wastewater and can be applied in purification plants and water supply systems.

Recently, liquid chlorine, ozone and ultraviolet rays have been used to decontaminate wastewater. This requires large intermediate contact capacities to ensure contact for at least half an hour. Chlorine decontamination is 91%, ozone up to 96%, and ultraviolet radiation up to 47%.

Inactivation of wastewater by cavitation is effected by operating the liquid by turbulent flows. Under the influence of hydrodynamic oscillations, cavitation bubbles appear and disappear in the liquid, at the same time stimulating the phase transition, increasing the local temperature and pressure. In addition, at the moment of cavitation bubbles occurrence and disappearance in the gas-filled cavities, conditions are created for the formation of electric charges, which occur in electric and magnetic fields. In this way, the cavitation effect in the liquid simultaneously exhibits thermobar and electromagnetic fields.

The peculiarity of the cavitation method is that the bacteria in the waste water are decontaminated by mechanical destruction due to the shock waves that occur during the cavitation process. At the same time, bacteria are also affected by thermobaric and electromagnetic fields in the liquid.

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There is a known method and apparatus for using a cavitation reactor (see U.S. Patent No. 6,556,548, C02F 1/34, 2003) in which cavitation phenomena occur in a fluid passing through a tube as its cross-section changes.

However, the efficiency of this method and device is low because the effect of cavitation is limited to a small area of the fluid and is transient.

Known Wastewater Treatment Methods of Operation Based on Aeration (See UA Patent No. 50574, C02 F 3/02; 3 / l2, 2005) or Injection of Natural Gas into a Purified Liquid (See UA Patent No. 28220, C02F 9/00 , 2000). There is also a known process for treating wastewater (see UA Patent No. 3,2299, C02F 3 / 00,2008), whereby the wastewater is subjected to periodic aeration, stirred, precipitated, sediment removed, and purified water fed to the first, second and third stage reactors.

The disadvantage of the above prototype is that it requires additional air supply and mixing equipment, which complicates the intensity of the cleaning process (over time) and does not allow wastewater to be decontaminated, since a single pass through the cavitation zone slows down the cleaning process and bubbles in the cavitator -5mm., Are not efficient enough.

The goal is to create a more efficient and faster wastewater treatment method by introducing additional technological operations into the known wastewater treatment process while at the same time decontaminating the treated water.

The object of the invention is achieved by collecting the wastewater to be treated in the receiving tanks after separating the solid fractions which are subjected to a re-circulating cavitation and mixing with portions of air. In this way, the large fractions in the wastewater are passed through the cavitator several times and mixed. Periodically changing the pressure in the cavitator creates shock waves that mechanically kill bacteria. Biological effects on the fluid to be cleaned are also occurring, as gas is bubbled in the form of gas bubbles from 0.2 to 0.4mm in portions simultaneously. increases the rate of degradation of biological particles.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a technological diagram illustrating the process of wastewater treatment and decontamination.

The realization of the method is carried out in three stages: mechanical cleaning, primary cleaning and decontamination, final cleaning and decontamination. The wastewater 1 is collected in the receiving tank 2 and enters the purification filters 3, where it is purified from the bulk waste. After the mechanical treatment, the waste water enters the tank 4, where it is subjected to a preliminary technological treatment and decontamination. The technological operation is performed by a vibratory cavitator 5, which is connected to the air valve 6. After the pre-treatment, the wastewater settles and is pumped by means of pump 7 to a tank 8 and sludge is pumped into the dryer by pump 9. The re-injection of wastewater into the tank 4 and its treatment are continued. The effluent from the tank 8 is subjected to a final cleaning and suction of the vibrator cavator 10 connected to the air valve 11, and the remainder is fed to the dryer by the sludge pump 13. Cavitators 5, 10 create a hydrodynamic cavitation process with cyclic flow of liquid (wastewater) through holes of predetermined length with pointed inlet and outlet ridges. The holes are located on a piston in a tube with a closed bottom. The lower part of the tube is connected through a tube with an air valve. When filling the tank, drainage pipe passes through the holes in the pipe to the piston and passes through it to the bottom of the pipe. When the vibrating actuator is actuated, the plunger moves downward and the effluent is pushed up through the holes, in the form of jets, and as the plunger moves upward, it becomes thinned and changes the direction of the jets while at the same time Hydrocavitation occurs at the determined piston-to-hole ratio and oscillation mode. The multiple passage of sewage through the treatment area, saturated with oxygen in the air, increases the intensity of sludge sludge crushing, as well as its acidification and decontamination.

Experimental bench studies showed that wastewater after treatment had a 2.2-fold reduction in biological oxygen demand and a 70% increase in acidity, while bacterial decontamination decreased from 63 to 3.

Compared to the prototype, a new set of structural elements, thanks to the introduction of multiple wastewater passes through a cavitation device with simultaneous portioning (metering) of air into the hydrocavitation zone, allows new technical properties to be achieved - accelerated purification and decontamination as a result of the introduction of new modifications of the technique allowing the discharge of non-hazardous waste.

Claims (1)

DEFINITION OF INVENTION Wastewater treatment and decontamination method, which combines periodic mechanical, biological purification and decontamination, wastewater deposition and sediment removal, characterized in that the wastewater is subjected to cyclic hydrocavitation with simultaneous metering of air into the cavitation zone in the form of bubbles from 0.2 to 0.4 millimeters.