FR3009552A1 - PROCESS FOR TREATING CONTINUOUS SANITATION WITH ALKALINE FLUID NEUTRALIZATION SOLUTION OF LIQUID EFFLUENTS AND USE THEREOF - Google Patents

Abstract

The treatment process in a treatment plant uses an alkaline solution of neutralization (A) of the flora of contaminated liquid effluents from funeral, hospital, post-modem or research laboratory discharges to make said effluent compatible with the water of a purification plant without bacteriological hazard for the treatment flora of said treatment plant. The continuous sanitization process is chemical by the use of the double-acting alkaline solution to chemically and microbiologically inert the raw and untreated effluents (A). The use of the essentially alkaline solution, neutralization (A) of the flora of the contaminated liquid effluents makes it possible to render said effluents compatible with the water of a purification plant (D) without bacteriological danger for the treatment flora of said treatment plant.

Description

The present invention relates to the treatment of polluted liquid effluents and, as a first step, liquids containing liquid effluents polluted and / or potentially contaminated biologically, namely originating from funeral, hospital, post mortem or research laboratory discharges were discharged directly. in the sanitation networks that flowed into rivers and / or lagoon areas that functioned as filters in length. Then it was considered to build liquid effluent treatment plants in the funeral homes and laboratories. But these treatment plants, in most cases, were unsatisfactory because the liquid that came out downstream always included polluted and contaminated effluents.

Some installations are classified and the law requires that the liquids discharged downstream be clean, that is to say the liquid effluents have been disinfected from their contaminating flora and reduced to a bacteriostatic state. In the case of ascites and blood, contaminated or not, these are regularly and by law recovered in tamper-proof containers for incineration. But here, there are the risks caused by transport, including the risk of misplacement, the risk of bursting container or other. In another specific case, it is known to those skilled in the art to treat fungi with an acidic solution (see document FR 2 365 525). However, this document relates to a different field, industrial polluted water (ERI). . In the funerary field, a person skilled in the art installs a treatment plant for treating the effluents before discharges into the ERUs. Thus, document FR 2 792 307 teaches how to carry out at least four acidification electrolysis steps of the neutralization effluent. However, such an approach is complicated. In order for the corresponding processing unit to operate with its different tanks and devices connected to one another, the person skilled in the art must find the time and arrange the equipment under specific conditions so that not only the flow proceeds correctly. But also the steps of the process must be carried out in the right order. In most cases, the skilled person avoids this solution, so it seems complicated to implement. In addition, acid treatment does not eliminate all microorganisms. It is true that acidophilic microorganisms are eliminated. But the neutrophilic and alkalophilic microorganisms remain. The situation is all the more pernicious as these microorganisms no longer develop. They have become bacteriostatic and it is even possible to mistakenly imagine that the treatment was effective. The person skilled in the art encounters another technical problem. Today, some sewage systems are equipped with sewage treatment plants. However, these treatment plants operate thanks to a specific flora, autotrophic and heterotrophic organisms, which have a function of digester. To keep it efficient, the flora of the treatment plant is oxygenated frequently and usually continuously. The person skilled in the art concluded that he could not fall back on a chemical treatment that is not suitable for treating the effluents of liquid that go downstream in a purification plant. Before the treatment obligation, the skilled person believes that the incineration upstream of a treatment plant is necessary.

Despite this reluctance, the document W02006 / 049625 (Waste Reduction by Wilson Joseph H Waste Reduc, Kaye Gordon) teaches a method for treating polluted liquid effluents continuously in a central processing unit comprising: - tanks connected to devices arranged upstream a sewage treatment plant, contaminated liquid effluents from biologically contaminated waste; comprising at least the following stages: introduction of said liquid effluents; treating the flora of said effluents by alkaline hydrolysis followed by a step in temperature steps to treat the remaining microorganisms - temperature treatment step of 25 ° C to 40 ° C to treat mesophilic microorganisms such as salmonella, staphylococci; temperature treatment step from 50 ° C to 70 ° C to treat thermophilic microorganisms such as eukaryotes, protozoa, fungi, algae, prokaryotes, streptomycetes, cyanobacteria, clostridia, bacillus. flow in said treatment plant (D); Such a known treatment has the disadvantage of being rigid with specific temperatures. This imposes a constant volume of treatment and prevents adaptation to different situations at room temperature addition of neutralization (A) of said flora, alkaline solution forming a cleaning liquid 40 disinfectant, sequestering and degreasing; The present invention aims to solve the technical problem by overcoming the prejudice of those skilled in the art, the compatibility of treatment of liquids containing contaminated liquids from funeral, hospital, post mortem or research laboratory discharges with the flora of plants. treatment plants, that is to say to treat the flora of said effluents without disturbing and / or interfere with the flora of the treatment plants.

The invention aims to solve the problem of adapting to liquids containing liquid effluents polluted and / or potentially contaminated biologically different origins ie not only from funeral, hospital, post-modem or research laboratory discharges; but also, of different volume. The treatment is different for volume for funeral rejections corresponding to one or more bodies. The temperature treatment steps do not make it possible to adapt the volume and the dosage in the central processing unit. The present invention aims at this result in the first place by a purification process. comprising at least the following steps after the introduction of said liquid effluents: - neutralization of the flora of said effluent by adding at room temperature an alkaline solution for neutralizing said flora, alkaline solution forming a disinfectant cleaning liquid, sequestering and degreasing; - flow of liquids, with an automatic addition and a proportional dosage of an alkaline compound; flow in said treatment plant; The ambient temperature is between 100 and 15 ° C. This process is chemical using at least one alkaline solution in accordance with that described above with double action to render the raw and untreated effluents chemically and microbiologically inert. According to other characteristics of the process: the treatment according to comprises a final stage of development of the treatment flora, typically the digestive flora of purification plants; the neutralization step is obtained the addition of a dosing solution of a selected volume of an alkaline compound, said choice of dosage being made possible by working at room temperature; The neutralization step is obtained the addition of a solution containing substantially 1.5 to 2.5% of an alkaline compound depending on the type of effluents collected according to whether they are funeral discharges, hospital , post modem or research laboratory in said contaminated effluent before flow in step, before the development stage 40 of the treatment flora of the treatment plant, followed by a step of discharge into the network of urban wastewater (ERU); the neutralization step is of a fixed duration as a function of the addition of the volume of treated effluents; The treatment comprises a step of analyzing the treated liquid until indication of the compatibility with the digestive flora of the purification plant by an automated control device or not; The control device comprises immersing a probe in the pretreated effluents to enable continuous analysis in a simple and safe manner.

The present invention relates secondly to the use of at least one prior neutralization followed by an alkaline solution for the irreversible neutralization of the flora of contaminated liquid effluents originating from funeral, hospital, post-mortem, or research laboratory waste. rendering said effluent compatible with the water of a purification plant without bacteriological hazard for the treatment flora of said treatment plant. According to other variants, the invention relates to the use of at least one alkaline solution conforming to that provided above, said solution being a liquid cleaning, disinfectant, sequestering and degreasing neutralization of the flora of contaminated liquid effluents. from funeral, hospital, post-modem or research laboratory discharges to render said effluents compatible with the water of a purification plant without bacteriological danger for the treatment flora of said treatment plant. a solution in accordance with that described above, said solution being alkaline alkaline-based, neutralizing the flora of contaminated liquid effluents from funeral, hospital, post mortem or research laboratories to make said effluents compatible with the water of a purification plant without bacteriological hazard for the treatment flora of said treatment plant.

Finally, the invention comprises various variants of the process: LI by a step in which the action is double by use upstream of a solution comprising a primary treatment not described here in the effluents.

E comprising a step of analysis by a control means, automated or not, to preserve the digestive flora of the treatment plants. - According to a variant of this analysis step the control means comprises the collection of pretreated effluents.

D according to another variant of this analysis step the control means comprises immersing a probe in the pretreated effluents to preserve the digestive flora of the purification plants participating in the analysis step to allow the analysis in a simple and safe way.

The invention also relates to the use of the process according to that described above for the treatment of medium and / or highly polluted and contaminated effluents to transform them into an effluent compatible with the flora of the purification plants, after bactericidal treatment. , before rejection in the networks of Urban Wastewaters says ERU.

Thanks to the use and the process according to the invention, it is possible to chemically treat at ambient temperature the flora of the effluents of polluted and contaminated liquids and to discharge the treated liquid into a purification plant without impairing its flora and without incineration.

The invention will be better understood on reading a nonlimiting example of implementation of the present invention which will now be described with reference to the appended figure.

The single figure is a flowchart explaining the method according to the invention. In a step A, a neutralizing composition is poured into the fluid comprising effluents contaminated funeral discharges, hospital, post mortem or research laboratories; which will stabilize the flora of said liquid effluents. Thus, a bacteriostatic state is obtained for said flora. The fluid comprising contaminated effluents continues to flow in step B with an automatic addition and proportional dosing of an alkaline compound.

Then in step C, said fluid is, or can be, taken for analysis for the purpose of using periodic analysis (s) or continuous (s) of the fluid as needed, which allows to control the compatibility of said fluid with the digestive flora of a purification plant.

The dilution acts advantageously by the concentration of the inputs to be treated, thereby promoting the chemical activity. Noting that the liquid has become compatible with the flora of the treatment plant; in the next step D, the fluid is discharged from the network liquid going into said purification plant. The digestive flora of the treatment plant is essential for the treatment of water in the said station.

For the purpose of using a sample in step C as described above for a fluid analysis makes it possible to ensure the compatibility of said fluid with the digestive flora. As an alternative embodiment, the analysis of step C may be carried out by means of a probe placed in the liquid; said probe for continuous and uninterrupted analysis. Although the invention has been described in connection with particular structures, it is by no means limited thereto and many variations can be made therein as additional steps for dealing with specific pollutions such as a preparatory phase which ends. in fine "by terminal alkalinization controlled by the automatic introduction of reagent into the reaction medium. The combinations of the different steps shown in the drawing or described above are not outside the scope of the invention.

REFERENCE SIGNALS A Neutralization of the flora of the liquid effluents B Flow after addition of the alkaline composition C Analysis D Flow in the treatment plant.

The reference signs inserted after the technical features mentioned in the claims are only intended to facilitate the understanding of the latter and in no way limit the scope.15

Claims (9)

CLAIMS1- Process for continuous treatment in a central processing unit comprising: - tanks connected to devices arranged upstream of a purification plant, - contaminated liquid effluents from the biologically contaminated waste; comprising at least the following stages: introduction of said liquid effluents; neutralizing the flora of said effluents by adding, at ambient temperature, an alkaline solution for neutralizing (A) said flora, an alkaline solution forming a disinfectant, sequestering and degreasing liquid; liquid flow (B), with automatic addition and proportional dosing of an alkaline compound; flow in said treatment plant (D). 2- Treatment process according to the preceding claim characterized by a final stage of development of the treatment flora, typically the digestive flora of purification plants. 3- Treatment process according to one of the preceding claims wherein the neutralization (A) is obtained by the addition of a dosing solution of a selected volume of an alkaline compound, said choice of dosage being made possible by work at room temperature. 4- Treatment method according to one of the preceding claims wherein the neutralization (A) is obtained by the addition of a solution containing substantially 1.5 to 2.5% of an alkaline compound depending on the type effluent collected according to whether they are funeral, hospital, post mortem or research laboratory discharges in said contaminated effluent before flow in stage (B), before the stage of development of the treatment flora of the station of purification, followed by a discharge stage in the urban wastewater network (ERU). 5- treatment method according to one of the preceding claims wherein the neutralization step (A) is of a fixed duration depending on the addition of the volume of treated effluents. 6. Treatment process according to one of the preceding claims comprising a step of analysis (C) of the treated liquid until indication of compatibility with the digestive flora of the treatment plant by an automated control device or not. 50 7- Method according to the preceding claim wherein the control device comprises immersing a probe in the pretreated effluents to allow continuous analysis in a simple and safe manner. 8- Use of a process according to any one of the preceding claims of essentially alkaline treatment of polluted and contaminated effluents transforming them into effluents compatible with the flora of the treatment plant to allow discharge into the water networks. Urban Residuals (ERU). 9- Use of a process according to any one of claims 1 to 5 of treatment wherein an alkaline solution of neutralization of the flora of contaminated liquid effluents from funeral, hospital, post mortem or research laboratories, said solution typically being a cleaning, disinfectant, sequestering and degreasing liquid is applied to the compatibility of said effluents with the water of a purification plant without bacteriological danger for the treatment flora of said purification plant, before being discharged into the urban residual water network (ERU).