Disclosure of Invention
Based on the above, it is necessary to provide an intensive textile sewage treatment method aiming at the problems existing in the prior art, so as to solve the problem that the waste of the washing liquid is serious in the treatment process of the wastewater treatment method in the prior art.
The above purpose is achieved by the following technical scheme:
An intensive textile sewage treatment method comprises the following steps:
s100: dewatering a predetermined volume of slurry to obtain a filter cake;
s200: preparing a preset volume of washing liquid according to the mass of the filter cake, wherein the volume of the washing liquid and the mass of the filter cake are positively correlated;
s300: washing the filter cake by using the washing liquid in the step S200, and dehydrating in the washing process to obtain the filter cake again;
s400: washing the filter cake in the step S300 for a preset time T1;
s500: dehydration is carried out to obtain a cake again.
Further, in step S300, the washing liquid is released at a preset speed to wash the filter cake.
Further, the release rate of the washing liquid in the first period of time is greater than the release rate in the second period of time.
Further, in step S300, when the ratio between the volume of the remaining washing liquid and the total volume of the washing liquid is a preset value, a rate of decrease in the mass of the filter cake is obtained once every preset time T2, and when the obtained rate of decrease is smaller than the first preset rate, release of the washing liquid is stopped.
Further, when the reduction rate of the nth filter cake mass is obtained, if the reduction rate of the nth filter cake mass is greater than or equal to the first preset rate, the release rate of the washing liquid is reduced to prolong the washing time until the washing liquid is completely released.
Further, in step S300, the filter cake is dehydrated by vacuum suction.
Further, in step S300, the preset time T1 of the water washing and the volume of the washing liquid are positively correlated.
Further, in step S300, the release rate of the fresh water for washing in the third period of time is greater than the release rate in the fourth period of time.
Further, in step S100, the slurry is dehydrated by vacuum suction.
Further, in step S500, the filter cake after washing is air-dried and dehydrated.
The beneficial effects of the invention are as follows: the intensive textile sewage treatment method of this embodiment, when working, firstly obtain the slurry of preset volume, then dehydrate the slurry, after dehydration, the sewage is discharged, the solid forms the filter cake, then dispose the washing liquid of preset volume according to the quality of the filter cake, and the volume of the washing liquid and quality of the filter cake are positive correlation, then wash the filter cake with the washing liquid, and carry on the dehydration operation in the cleaning process, the washing liquid can remove grease, dirt, etc. in the filter cake, in the injection process of the washing liquid, the quality of the filter cake is continuously reduced, after the washing liquid is used up, the washing is completed, the dehydration operation is also completed, get the filter cake again. The filter cake is washed with water for a preset time T1, the washing liquid on the filter cake is removed, the filter cake is dehydrated again, the washing liquid is prepared according to the quality of the filter cake in the cleaning process, the waste of the washing liquid is not easy to occur, and the concentrated textile sewage treatment method is used for treating filter pulp with unstable concentration, so that the waste of the washing liquid can be reduced.
Detailed Description
The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The numbering of components herein, such as "first," "second," etc., is used merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
An intensive textile sewage treatment method according to an embodiment of the present invention is described below with reference to fig. 1.
The intensive textile sewage treatment method of the embodiment comprises the following steps:
s100: dewatering a predetermined volume of slurry to obtain a filter cake;
s200: preparing a preset volume of washing liquid according to the mass of the filter cake, wherein the volume of the washing liquid and the mass of the filter cake are positively correlated;
s300: washing the filter cake by using the washing liquid in the step S200, and dehydrating in the washing process to obtain the filter cake again;
s400: washing the filter cake in the step S300 for a preset time T1;
s500: dehydration is carried out to obtain a cake again.
The slurry cleaned by the intensive textile sewage treatment method of the embodiment contains both solids and liquids, wherein the solids contain usable parts and unusable parts, and the unusable parts are impurities such as grease, dirt and the like adsorbed on the solids, and the solids need to be cleaned by using a detergent.
The intensive textile sewage treatment method of this embodiment, when working, firstly obtain the slurry of preset volume, then dehydrate the slurry, after dehydration, the sewage is discharged, the solid forms the filter cake, then dispose the washing liquid of preset volume according to the quality of the filter cake, and the volume of the washing liquid and quality of the filter cake are positive correlation, then wash the filter cake with the washing liquid, and carry on the dehydration operation in the cleaning process, the washing liquid can remove grease, dirt, etc. in the filter cake, in the injection process of the washing liquid, the quality of the filter cake is continuously reduced, after the washing liquid is used up, the washing is completed, the dehydration operation is also completed, get the filter cake again. The filter cake is washed with water for a preset time T1, the washing liquid on the filter cake is removed, the filter cake is dehydrated again to obtain the filter cake, the washing liquid is prepared according to the quality of the filter cake in the cleaning process, the waste of the washing liquid is not easy to occur, and the concentrated textile sewage treatment method is used for treating filter pulp with unstable concentration, so that the waste of the washing liquid can be reduced.
The specific volume parameters of the washing liquid can be tested in advance, and under the condition of ensuring that the washing liquid can be washed cleanly, the simulation function relation between the volume parameters of the washing liquid and the quality parameters of the filter cake is obtained, and after the quality of the filter cake is obtained, the volume of the washing liquid to be configured can be obtained according to the simulation function relation.
In one embodiment, in step S300, the filter cake is cleaned by releasing the wash liquid at a preset rate. In order to fully utilize the washing liquid, the washing liquid is released at a preset speed, so that the washing liquid can fully clean the filter cake. The preset speed may be uniform or variable, and the washing is performed at a variable speed, so that the use ratio of the washing liquid can be improved.
In one embodiment, the release rate of the wash liquid during the first time period is greater than the release rate during the second time period. The method comprises the steps of dividing the washing process of the washing liquid on the filter cake into a front stage and a rear stage according to time, and releasing the washing liquid to wash the filter cake at a larger release speed in the first stage due to the fact that more impurities in the filter cake are in the beginning, and reducing the release speed of the washing liquid in the second stage along with the gradual removal of the impurities.
In one embodiment, in step S300, when the ratio between the volume of the remaining washing liquid and the total volume of the washing liquid is a preset value, the rate of decrease in the mass of the filter cake is obtained once every preset time T2, and when the obtained rate of decrease is smaller than the first preset rate, the release of the washing liquid is stopped. In order to further save the washing liquid, in the cleaning process, whether the filter cake is cleaned or not is further judged when the washing liquid is not released, and if the filter cake is cleaned, the release of the washing liquid is stopped in time, so that unnecessary consumption can be reduced. Specifically, the preset value may be one-fourth, at which time most of the washing liquid has been consumed, and there is a possibility that the filter cake has been washed clean, so that the rate of decrease in the mass of the filter cake is obtained once every preset time T2 and compared with the first preset rate. In other embodiments, the preset value may be one fifth or one sixth.
When the ratio between the volume of the remaining washing liquid and the total volume of the washing liquid is a preset value, suspending releasing the washing liquid, obtaining the current mass M1 after the filter cake is dehydrated, then releasing the washing liquid, after a preset time T2, suspending releasing the washing liquid again, obtaining the current mass M2 after the filter cake is dehydrated, comparing the ratio with a first preset rate when the reduction rate obtained is smaller than the first preset rate, indicating that the filter cake is cleaned, and stopping releasing the washing liquid at the moment, so as to save the washing liquid. It should be noted that the first preset rate may be specifically set according to the accuracy of the measuring device and the cleaning solution releasing device, and the unit time T2 may be reasonably set according to the total amount of the cleaning solution, the releasing speed and the cleaning effect.
Further, in one of the embodiments, when the rate of decrease in the mass of the nth filter cake is obtained, if the rate of decrease in the mass of the nth filter cake is greater than or equal to the first preset rate, the release rate of the washing liquid is decreased to extend the washing time until the washing liquid is completely released. If the reduction rate of the mass of the filter cake for the first time is greater than or equal to the first rate, the release rate of the washing liquid is carried out according to the originally set rate, the release of the washing liquid is stopped after the preset time T2 is continued, the current mass M3 is obtained after the filter cake is dehydrated, the ratio of the difference between the mass of the filter cake M3 and the mass of the filter cake M2 and the preset time T2 is obtained, the ratio is compared with the first preset rate, and whether the release of the washing liquid is stopped or not is determined, and the process is repeated. When the reduction rate of the quality of the nth filter cake is obtained, in this embodiment, n may be 3, if the reduction rate of the quality of the 3 rd filter cake is still greater than or equal to the first preset rate, which indicates that the filter cake is not easy to clean, the release rate of the washing liquid is reduced at this time to prolong the cleaning time, and the cleaning effect is improved until the washing liquid is completely released. In other embodiments, the number n may be 4 or 5.
In one embodiment, in step S300, the filter cake is dewatered by means of vacuum suction. The filter cake is dehydrated in a vacuum suction mode, so that the flow direction of the removed liquid is conveniently controlled, the liquid is not easy to splash, and the structure required to be arranged during suction is simpler. In other embodiments, the filter cake may also be dewatered by centrifugation.
In one embodiment, in step S300, the preset time T1 of the water washing and the volume of the washing liquid are positively correlated. When the washing liquid is used to wash the filter cake, the larger the amount of the washing liquid used, the more washing liquid may remain on the filter cake, so that the preset time T1 of washing with water and the volume of the washing liquid are positively correlated, that is, the larger the volume of the washing liquid is, the longer the washing time is, in order to be able to sufficiently remove the washing liquid on the filter cake.
In one embodiment, in step S300, the release rate of the fresh water for washing in the third period of time is greater than the release rate in the fourth period of time in step S300. The preset time T1 of the water washing is divided into a third time period and a fourth time period, and the release speed of the clean water in the third time period is larger than that in the fourth time period. Because the washing liquid in the filter cake is more at the beginning, so in the third time period, release the clear water with great release rate and wash the filter cake, along with the washing liquid is got rid of gradually, in the fourth time period, reduce the release rate of clear water, through this kind of setting mode, when guaranteeing to clean up the washing liquid, the rational utilization clear water reduces the waste to the clear water.
In one embodiment, the slurry is dewatered by vacuum suction. Adopt the mode of vacuum suction to dewater the thick liquid, the flow direction of convenient control sewage that deviate from, sewage is difficult for splashing, and the required structure that sets up is comparatively simple when the suction. In other embodiments, the slurry may be dewatered by centrifugation.
In one embodiment, in step S500, the filter cake after washing is air-dried to remove water. After the water washing is finished, the water in the filter cake is required to be removed, so that the subsequent recycling is facilitated, the water in the filter cake can be removed to the greatest extent by adopting an air drying and dehydration mode, and the water content of the filter cake is reduced.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.