CS200743B1 - Method of preparation of the hypochlorite solution for deodorization of the refuse gases and facility for making the same - Google Patents

Description

The present invention relates to a process for the preparation of a hypochlorite solution for deodorizing waste gases, in particular to venting off-gases from treatment facilities and biological materials, and to a device for carrying out the process. The invention is primarily intended for establishments of veterinary sanitation institutes and for establishments of the food, agricultural, etc. industry.

Biological and / or hydrolytic and pyrolytic decomposition products are a nuisance in the handling and processing of biological materials and waste. In order to protect the environment from these pollutants, a number of methods and devices have been developed and put into practice, mostly based on the capture or disposal of said pollutants by water washing or oxidation by the action of air, additional agents or heat. Among the most commonly used methods are methods based on the addition of chlorine gas to the addition of a hypochlorite solution, usually sodium. Due to the difficulties associated with the storage and handling of these substances, a process for the production of sodium hypochlorite directly within the deodorizing apparatus has been developed by incorporating the respective electrolyzer into the circulation circuit of the liquid spill. An example of such a solution is the Pepcon plant of Pacific Engineering & Production Co of Nevada and the Odoxo method with a Chloropac cell of Engelhardt Ind.

The inclusion of an electrolyzer for preparing the hypochlorite solution in the circulation circuit is

200 743

200 743 logically the simplest solution. However, it has the disadvantage that the entrapped components all have a negative effect on the electrolysis and that it is necessary to maintain the concentration of chloride ions prescribed by the supplier throughout the volume of the switching solution, usually about 5% by weight. and more. The first circumstance applies to the deodorization of waste gases from the treatment of warm-blooded animals containing sulfur compounds, the second to the difficulty of draining the high-salt scrubbing waters. In addition, it should be noted that the alkalinity of the scrubbing solution, usually required within about pH 9, is no longer suitable for the electrochemical preparation of hypochlorite, and neutral or weakly acidic solutions are no longer sufficiently effective in deodorizing.

The above-mentioned disadvantages are overcome by the process for preparing a hypochlorite solution for the deodorization of waste gases according to the invention, which consists in preparing the hypochlorite solution outside the deodorizing scrubbing circuit by first saturating the additional water or a part of it with chloride, usually sodium, then some of the chloride ions are converted electrochemically to hypochlorite ions, and the solution thus treated is introduced into the scrubbing liquid prior to its injection into the column. This method is carried out in an apparatus according to the invention, in which the dissolving tank is connected to the supply line by a branching line, which connects to an electrolyser supplied by a direct current from a rectifier and to an additional solution line leading to the liquid scrubber spray. absorber.

An advantage of the process for preparing the hypochlorite solution and the apparatus for carrying out the process is that it allows the electrolytic enrichment of brine with pure, free of any foreign matter, and allows to limit the necessary sodium chloride concentration to the amount of solution to be processed in the electrolyser.

The method and the embodiment of the device according to the invention are given by way of example in the attached drawing and description of the deodorization of the exhaust ventilation exhaust gases from the storage and operation of the veterinary sanitation center.

A branch pipe 6 is connected to the supply line 6, which opens into a dissolving tank 5, connected by a connecting line 6 with a direct current electrolyser from the rectifier and further connected by a connecting line 6 to the circulating circuit of the deodorizing liquid scrubber.

Ventilation off-gases, difficult to produce a significant odor caused mainly by the content of hydrogen sulfide, mercaptan, ammonia and other olfactory substances, deodorize by water scrubbing, in which ee continuously or periodically causes sodium hypochlorite solution. In this case, said electrolyzer 6 is incorporated into the make-up water system. After branching off a portion of the water from the inlet pipe 6 in the branch 6, said water is saturated with sodium chloride in the dissolving tank 6. From this, the sodium chloride solution is periodically or continuously fed via a connecting line 6 to the electrolyzer 6, where part of the chloride ions is converted into hypochlorite ions by the direct current drawn from the rectifier. The solution thus treated is fed into the water scrubbing circuit via line 8 for the additional solution.

Claims (2)

1. A process for preparing a hypochlorite solution for deodorizing waste gases with a hypochlorite scrubber and electrochemical reagent preparation during operation of a deodorizing station, characterized in that the hypochlorite solution is prepared outside the deodorizing scrubber circuit by first saturating the make-up water or a part thereof with chloride; usually sodium, then a portion of the chloride ions is converted electrochemically to hypochlorite ions, and the thus treated solution is introduced into the scrubbing liquid before it is injected into the column. Device for carrying out the method according to claim 1, characterized in that it consists of a supply line (1) to which it is connected by a branch (2) of the dissolving tank (3), by a connecting line (4) connected to the electrolyser (5) from the rectifier (6), and then the line (7) to the additive solution, resulting in the injection of the scrubbing liquid of the abaorber.