The method of sewage treatment


 

(57) Abstract:

The method relates to methods of treatment of wastewater in agricultural production, food industry, etc. Drains ozoniruyut in the circuit. In this circuit, the drains carry the influence of ultrasound and sinks further mixed with sorbent-based zeolite and/or ash from the combustion of peat and/or schist and/or dust that is waste in cement production. The liquid fraction is homogenized with a change in its pH to at least 3 serves sorbent and increase the pH of the liquid fraction to at least 10, is mixed with a coagulant and/or flocculant and defend with correction of pH to its normal size. Next, the liquid is saturated with air and exposed to ultrasound in the cavitation mode and ultraviolet radiation in continuous or pulsed mode with a pulse frequency of 1-10 Hz and a power density of at least 20 kW/m2. This allows you to effectively precipitate dissolved in the effluent substances and to separate the precipitated sludge from the purified liquid. 3 Il., 13 table.

The invention relates to methods of treatment of wastewater in agricultural production, food industry.

Known methods of sewage treatment, vkljucke impact in these cases, it may be in the form of exposure to radiation, ultrasound and so on, but these methods are ineffective, because when heavily contaminated effluents degree of separation of the solid particles and dissolved material from the liquid is small.

Also there is a method of treatment of domestic wastewater, including mechanical treatment of water, with consequent impacts on liquid physical factor - UV and filtration [2]. This sequence allows for a more subtle treatment, but her degree is in most cases insufficient.

Closest to the present invention is a method of purification of wastewater, including wastewater ozonation followed by coagulation and flotation, settling and separation of liquids from solid sludge [1]. However, in this case, the quality of cleaning is not enough.

The objective of the invention is to increase the efficiency of the method, i.e., better cleaning.

This task is solved in that the ozonation is carried out in the circuit, and this circuit to sinks provide exposure to ultrasound and sinks further mixed with sorbent-based zeolite, and/or ash from the combustion of peat and/or schist and/or dust that is waste in cement production, velichinam pH of the liquid fraction to at least 10, mixed with a coagulant and/or flocculant, and then defend her with correction of pH to its normal value, then the liquid is saturated with air and exposed to ultrasound in the cavitation mode and then exposed to ultraviolet radiation in a pulse mode with a pulse frequency of 1-10 Hz and the power density per pulse of at least 20 kW/m2.

In Fig. 1-3 presents the stages of implementation of the method. The method is implemented as follows.

At the first stage (Fig.1) drains fall into the circulation loop, consisting of jet pump 1, at the entrance of which has an ejector 2 for air suction and injection of ozone, and the cavitation chamber 3, the role of which can play the output cone of the pump 1 or the individual magnetostrictive ultrasonic emitter and the reaction chamber 4. Water received it bubbles through the next ejection pump 1 is in the cavitation chamber 3, which is subjected to ultrasonic field with a frequency of 25-35 kHz and a power of 0.05 to 1 W/cm2. Under the action of ULTRASONIC fields there is a partial destruction of macromolecules and agglomerates, ozone is produced (not less than 0.1 mg/l), there is a dispersion of air bubbles, and there is a volume orbent [6] and then again submitted to the pump 1. This allows you to effectively mix the sorbent increases, and multiple passing their path many times to increase the efficiency of the sorbent. The latter is a sorbent-based zeolite, and/or ash from the combustion of peat and/or schist and/or dust that is waste in cement production, and these components are subjected to sintering at high (>1000oC) temperatures, i.e., those wastes, the price of which is hundreds of times less is known of the used sorbents. High-temperature treatment on the surface of sorbents are formed active centres of radical or ionic type, i.e., the sorbent-catalyst with high selectivity.

In table. 1-3 presents the particle size of the sorbent, the content of macro-and trace elements, respectively, and table.4 - the content of the clarified water at a dilution of sorbent in the ratio of 1:10.

At the second stage of the treatment (Fig.2) the wastewater is collected in a sewage pumping station, where the homogenized with a change in pH to a value of not less than 3, then passed into the reaction chamber 6, where the change of pH to at least 10 with simultaneous supply of sorbent, after which the effluent is served in the settlers 7, which serves a coagulant and/or focused from the clarified liquid effluent is deposited on the bottom. The clarified part is given, and the dry residue can be recycled next. In certain cases, the sorbent can be modified by the addition of oxidants (type manganese oxide). Cleaning results at this stage are given in table. 5-11.

At the third stage (Fig. 3) the liquid from the sump 7 enters the circuit, including the jet pump 8 with the ejector 9 and the cavitation chamber 10 (the camera 10 can be made on a separate ULTRASONIC emitter), a photochemical reactor 11 and the filter 12. The liquid from the tank 7 is supplied to the pump 8, where the ejector 9 is sucked air, cavitation chamber 10 in a fluid under the action of ULTRASONIC ozone is formed, and the passage of reactor 11 is also the emergence of hydrogen peroxide and a variety of active radicals that very effectively influences the microflora and allows docility and link remaining in the liquid part of the inclusion and connection. Ultraviolet radiation affects the fluid in continuous or pulsed mode with a pulse frequency of 1-10 Hz and a power density of at least 20 kW/m2it was experimentally obtained. In table. 12 and 13 shows the results of the implementation of wastewater treatment in the third stage of the treatment.

Offer spot with very little expenditure of energy and reagents.

The method of purification of wastewater, including wastewater ozonation followed by coagulation and flotation, settling and separation of the liquid from the solid residue, wherein the ozonation is carried out in the circuit, also in this circuit to sinks interact ultrasound, and sinks further mixed with sorbent-based zeolite, and/or ash from the combustion of peat and/or schist and/or dust that is waste in cement production, after which the liquid fraction is homogenized with a change in its pH to not less than 3, serves sorbent and increase the pH of the liquid fraction to at least 10, is mixed with a coagulant and/or flocculant, and then defend her with correction of pH to its normal value, then the liquid is saturated with air and exposed to ultrasound in the cavitation mode and then exposed to ultraviolet radiation in continuous or pulsed mode with a pulse frequency of 1-10 Hz and a power density of at least 20 kW/m2.

 

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