CN115115288B - Chemical plant sewage treatment result evaluation method - Google Patents
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Abstract
The invention relates to the technical field of data processing, in particular to a chemical plant sewage treatment result evaluation method, which comprises the following steps: acquiring a difference value of heavy metal contents and a difference value of SS values of chemical plant sewage with a preset volume before and after filtration to obtain a heavy metal difference and a SS value difference; acquiring a sewage filtration difficulty evaluation index according to the heavy metal difference and the SS value difference, calculating a similarity index, and grouping set time periods according to the similarity index; and calculating a filter attenuation index corresponding to the current moment, judging whether to replace the filter according to the group of the set time period corresponding to the current moment, the filter attenuation index and the threshold, and obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage. The invention can consider the using condition of the filtering agent, timely replace the filtering agent and accurately obtain the sewage treatment result.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a chemical plant sewage treatment result evaluation method.
Background
The chemical industry is the backbone industry of national economy in China, and with the vigorous development of the chemical industry, the number of chemical plants is gradually increased. The production of chemical plants inevitably produces a large amount of sewage which contains a lot of harmful components, and once the components are discharged into water or soil, the ecological environment is destroyed, and the health of organisms and human beings is also harmed, so that the strengthening of the sewage treatment work of the chemical plants is an important matter related to the harmonious development of the society. In recent years, the investment of the country is increased, the sewage treatment work has already been successful, but the problems of hidden pipe discharge, water resource waste, high sewage treatment cost and the like exist in partial chemical plants, and the problems seriously restrict the sewage treatment effect.
However, in the existing sewage treatment effect evaluation method, the sewage treatment result is evaluated only according to the content of heavy metals or impurities in the sewage, and the evaluation is not comprehensive, so that the evaluation effect is not good.
Disclosure of Invention
In order to solve the above technical problems, the present invention aims to provide a chemical plant sewage treatment result evaluation method, which adopts the following technical scheme:
respectively collecting chemical plant sewage with preset volume at different moments in each set time period, and simultaneously collecting filtered chemical plant sewage; acquiring the difference value of the heavy metal content of chemical plant sewage with a preset volume before and after filtration to obtain the heavy metal difference at different moments in a set time period; acquiring the SS value difference value of chemical plant sewage with a preset volume before and after filtration to obtain the SS value difference at different moments in a set time period;
obtaining a sewage filtration difficulty evaluation index in a set time period according to the mean value of the heavy metal difference and the mean value of the SS value difference at all the moments in the set time period; calculating the similarity index of the sewage filtration difficulty evaluation indexes in any two time periods in all set time periods; grouping all the set time periods according to the similarity indexes to obtain a first group and a second group;
calculating a filter attenuation index according to the sewage filtration difficulty evaluation in a set time period, the ratio of the heavy metal content of the factory sewage before filtration to the heavy metal content of the factory sewage after filtration at different times and the ratio of the SS value of the factory sewage before filtration to the SS value of the factory sewage after filtration at different times;
if the set time period corresponding to the current moment belongs to the first group and the filter attenuation index corresponding to the current moment is smaller than the first threshold value, the COD value in the chemically treated chemical plant sewage is obtained after the filter is replaced, and the sewage treatment result evaluation is obtained according to the COD value and the filter attenuation index; if the filter attenuation index corresponding to the current moment is larger than a first threshold value, directly obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage;
if the set time period corresponding to the current moment belongs to the second group and the filter attenuation index corresponding to the current moment is smaller than the second threshold value, the chemical treatment plant sewage is subjected to sewage treatment result evaluation after the filter is replaced; and if the filter attenuation index corresponding to the current moment is larger than a second threshold value, directly obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage.
Preferably, the method for obtaining the evaluation index of the sewage filtration difficulty specifically comprises the following steps:
wherein, the first and the second end of the pipe are connected with each other,
is the evaluation index of the filtration difficulty of the sewage in the a-th set time period,
represents the mean value of the heavy metal difference at all the moments in the a-th set time period,
shows a sequence formed by heavy metal differences at all times in the a-th set time period,
represents the average value of the SS value differences at all times within the ith set period,
and represents a sequence in which the SS value differences at all times within the a-th set period are heterogeneous.
Preferably, the method for obtaining the similarity index specifically comprises the following steps: and calculating the similarity index of the sewage filtration difficulty evaluation index according to the reciprocal of the difference value of the sewage filtration difficulty evaluation indexes in any two set time periods.
Preferably, the method for obtaining the index of the attenuation index of the filtering agent specifically comprises the following steps:
wherein the content of the first and second substances,
showing the index of the filter attenuation index corresponding to the ith moment in the a-th set time period,
and
respectively representing the heavy metal content of the chemical plant sewage before and after filtration at the ith moment in the a-th set time period,
and
respectively representing the SS values of the chemical plant sewage before and after filtration at the ith time in the a-th set time period.
Preferably, the set time period corresponding to the current time is specifically: the length of time between when the chemical plant starts to perform the sewage treatment and the present time.
Preferably, the evaluation of the sewage treatment result obtained according to the COD value and the filter attenuation index specifically comprises:
obtaining the reliability of sewage treatment according to the COD value and the filter attenuation index in the sewage at the current moment, and if the reliability is greater than a degree threshold value, evaluating the sewage treatment result at the current moment as excellent; and if the reliability degree is less than the degree threshold value, evaluating the sewage treatment result at the current moment as poor.
The embodiment of the invention at least has the following beneficial effects:
according to the method, the difference value of the heavy metal content and the difference value of the SS value of the chemical plant sewage before and after filtration are obtained, the sewage filtration difficulty evaluation index is calculated, the pixel points of the sewage filtration difficulty evaluation index are grouped, the filter attenuation index corresponding to the current moment is calculated, whether the filter is replaced or not is judged according to the group of the set time period corresponding to the current moment, the filter attenuation index and the threshold, and then the sewage treatment result evaluation of the chemical plant sewage after chemical treatment is obtained. The invention can accurately acquire the using condition of the filtering agent for the chemical plant sewage treatment at the current moment, and can replace the filtering agent in time when the sewage treatment effect is reduced when the consumption speed of the filtering agent is too high, thereby keeping good sewage treatment effect. And by combining the relevant data indexes after filtration and chemical treatment, the obtained sewage treatment result is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the method for evaluating the result of chemical plant sewage treatment according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given for the evaluation method of the chemical plant sewage treatment results according to the present invention, with reference to the accompanying drawings and preferred embodiments, and the specific implementation, structure, characteristics and effects thereof. In the following description, different "one embodiment" or "another embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following describes a specific scheme of the chemical plant sewage treatment result evaluation method provided by the invention in detail with reference to the accompanying drawings.
Example (b):
the invention aims at the following scenes: the sewage treatment of the chemical plant is processed by using the filtering agent, and after the filtering agent is used for a period of time, the sewage treatment of the chemical plant is evaluated in real time.
Referring to fig. 1, a flow chart of a method for evaluating a chemical plant sewage treatment result according to an embodiment of the present invention is shown, the method comprising the following steps:
step one, collecting chemical plant sewage with a preset volume at different moments in each set time period, and collecting filtered chemical plant sewage at the same time; acquiring the difference value of the heavy metal content of chemical plant sewage with a preset volume before and after filtration to obtain the heavy metal difference at different moments in a set time period; and obtaining the SS value difference of the chemical plant sewage with the preset volume before and after filtration to obtain the SS value difference at different moments in the set time period.
First, since sewage is generated every moment when a chemical plant is normally operated, a life cycle of a filtering agent is extremely required. If the service life of the filter is too short, frequent replacement of the filter not only increases the workload, but also increases the cost of the factory, and therefore the filter is generally required to have a service cycle of a certain time length. As the service life of the filtering agent is increased, the evaluation of the sewage treatment effect is required to be carried out at the time of the service life of the filtering agent. Wherein, the filter with a proper service cycle can be selected by an implementer according to the actual situation.
Meanwhile, because the chemical plants have different working states at all times and different contents of generated wastewater, the present embodiment takes a chemical plant which normally operates as an example to study and explain the sewage treatment results of the chemical plant at the present moment. This chemical plant adopts two-layer filter equipment to carry out filtration treatment to sewage, specifically for using active carbon and iron-based nanoparticle to adsorb the sediment to macromolecule and heavy metal material in the sewage. After the filtration treatment is carried out, analysis is carried out according to the treatment result, and the sewage is finally treated by adopting an adaptive chemical treatment method.
Then, collecting the chemical plant sewage with the same preset volume before and after filtration at the same time in each set time period. Because some toxic heavy metal substances exist in the chemical plant sewage, and it is known that heavy metal ions such as lead, arsenic, cadmium, chromium, selenium, mercury, cobalt and the like can damage water quality, the heavy metal substances in the chemical plant sewage need to be adsorbed. The adsorption is a common heavy metal removal technology, and is a mature technology, low in cost and good in effect, so that the adsorption technology is more attractive to chemical plant sewage treatment. Among them, iron-based nanoparticles are the most common nano-adsorbent for removing heavy metals.
And measuring the content of the heavy metal collected at each moment in each set time period before and after filtration by using an atomic fluorescence method, calculating the difference value of the content of the heavy metal of the chemical plant sewage at each moment before and after filtration, and recording the difference value as the difference of the heavy metal at different moments in the set time period.
Finally, the SS value of the chemical plant sewage is also one of the important factors for evaluating the sewage treatment effect, and if the SS value of the chemical plant sewage is too high, the solid impurity content in the chemical plant sewage is high, and the limitation of reusing the sewage is large. Therefore, in this embodiment, activated carbon is used to perform adsorption treatment on chemical plant sewage, and the SS values of the chemical plant sewage before and after filtration are measured by using a vacuum pump and a nitrocellulose filter membrane method, and the difference between the SS values of the chemical plant sewage before and after filtration is calculated and recorded as the difference between the SS values at different times in a set time period.
In this embodiment, the chemical plant sewage treatment condition is evaluated at the current time, and the set time period corresponding to the current time is a time length from when the chemical plant starts sewage treatment to the current time. In this embodiment, the time when the chemical plant starts to perform sewage treatment every day is set to be nine am, and the current time is set to be six pm, so that the time length of the set time period corresponding to the current time is 9 hours. The method is used for evaluating the chemical plant sewage treatment result at the current moment by combining the chemical plant sewage treatment result in the historical time period. Therefore, data of each time in a plurality of set time periods with the same time length needs to be acquired, specifically, the plurality of set time periods are from nine am to six pm, and the time corresponding to the set time period is set to 1 hour, that is, the data acquisition is performed at the same time every hour every day.
Meanwhile, the preset volume is set to be 1 liter, a plurality of set time periods are selected to be 20 days, and an implementer can select a proper value according to the actual situation.
Step two, obtaining a sewage filtration difficulty evaluation index in the set time period according to the mean value of the heavy metal difference and the mean value of the SS value difference at all the moments in the set time period; calculating the similarity index of the sewage filtration difficulty evaluation indexes in any two time periods in all set time periods; grouping all the set time periods according to the similarity indexes to obtain a first group and a second group; and calculating the attenuation index of the filtering agent according to the difficulty evaluation of sewage filtration in a set time period, the ratio of the heavy metal content of the sewage of the chemical plant before and after filtration at different times and the SS value of the sewage of the chemical plant before and after filtration at different times.
Firstly, calculating an evaluation index of the filtering difficulty of the sewage in a set time period, and expressing the evaluation index as follows by a formula:
wherein the content of the first and second substances,
is the evaluation index of the filtration difficulty of the sewage in the a-th set time period,
shows a sequence formed by heavy metal differences at all times in the a-th set time period,
indicates a sequence in which the SS value differences at all times within the a-th set period are heterogeneous.
Meanwhile, the working strength of the chemical plant in the set time period can be reflected by the sewage filtration difficulty evaluation index to a certain extent, the larger the value of the sewage filtration difficulty evaluation index is, the more difficult the chemical plant sewage is to be filtered, and the larger the contents of impurities and heavy metals in the sewage are, the larger the working strength of the internalized plant in the set time period can be known, and the smaller the working strength is.
Then, according to the reciprocal of the difference value of the sewage filtration difficulty evaluation indexes in any two time periods in all the set time periods, calculating the similarity index of the sewage filtration difficulty evaluation indexes, and expressing the similarity index as follows by using a formula:
wherein, the similarity index of the sewage filtration difficulty evaluation index is shown,
for the evaluation index of the filtration difficulty of the sewage in the a-th set time period,
for the evaluation index of the filtration difficulty of the sewage in the (b) th set time period,
the difference value of the sewage filtration difficulty evaluation indexes in the a-th set time period and the b-th set time period is smaller, the similarity index is larger, and the difference value is smaller, so that the difference value shows that the sewage filtration difficulty evaluation indexes in the two set time periods are largerThe more similar the difficulty of water filtration.
Further, all the set time periods are grouped according to the similarity index to obtain a first group and a second group. Can divide into a set of with the similar time quantum of the degree of difficulty of filtering through grouping, in this embodiment, sewage in each settlement time quantum in the first group filters the degree of difficulty great, and the sewage filters the degree of difficulty evaluation index great in the settlement time quantum promptly, and the internalization factory sewage of settlement time quantum is more with heavy metal content, and the decay rate of handling required filter to sewage is very fast, and the frequency that needs to be changed is very fast.
The sewage filtering difficulty in each set time period in the second group is smaller, namely the sewage filtering difficulty evaluation index in the set time period is smaller, the contents of impurities and heavy metals in the sewage of the internalization factory in the set time period are smaller, the attenuation speed of the filter agent required by sewage treatment is slower, and the frequency required to be replaced is slower.
Finally, calculating the index of the attenuation index of the filtering agent, and expressing the index as follows by using a formula:
wherein, the first and the second end of the pipe are connected with each other,
showing the index of the filter attenuation index corresponding to the ith moment in the a-th set time period,
and
respectively representing the heavy metal content of the chemical plant sewage before and after filtration at the ith moment in the a-th set time period,
and
respectively representing the SS values of the chemical plant sewage before and after filtration at the ith time in the a-th set time period.
If the set time period corresponding to the current time belongs to the first group and the filter attenuation index corresponding to the current time is smaller than the first threshold value, the COD value in the chemically treated chemical plant sewage is obtained after the filter is replaced, and the sewage treatment result evaluation is obtained according to the COD value and the filter attenuation index; and if the index of the filter attenuation index corresponding to the current moment is larger than the first threshold value, directly obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage.
If the set time period corresponding to the current moment belongs to the second group and the filter attenuation index corresponding to the current moment is smaller than the second threshold value, obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage after the filter is replaced; and if the filter attenuation index corresponding to the current moment is larger than the second threshold value, directly obtaining the sewage treatment result evaluation of the chemically treated chemical plant sewage.
Firstly, calculating a filter attenuation index corresponding to the current time, wherein the filtering difficulty of sewage of different groups is different, and correspondingly, the filter attenuation speed is different, so that the group to which the sewage belongs needs to be analyzed and judged in a set time period corresponding to the current time, and then the threshold value judgment is carried out on the filter attenuation index corresponding to the current time, so that the use condition of the filter for sewage treatment of the chemical plant at the current time can be accurately obtained, when the consumed speed of the filter is too high, the sewage treatment effect is reduced, the filter can be replaced in time, and a good sewage treatment effect is kept.
Then, if the set time period corresponding to the current time belongs to the first group, it is indicated that the content of impurities in the internalization factory sewage is high in the set time period corresponding to the current time, and the filter is consumed at a high speed, so that the filter may need to be replaced in advance at a certain time.
Meanwhile, if the filter attenuation index corresponding to the current moment is smaller than the first threshold, the filter needs to be replaced by related workers when the filter reaches the time needing to be replaced at the current moment, and chemically treated chemical plant sewage is obtained after the filter is replaced.
After the adsorption treatment, the impurities in the water may have been completely or largely filtered, but the water may also contain toxic chemical components that are not fully removed by adsorption nor filtration. Aiming at sewage with different properties, the final treatment is carried out in the form of one or a plurality of mixing of a sewage neutralization treatment method, a sewage coagulation treatment method, a sewage chemical precipitation treatment method, a sewage oxidation treatment method and a sewage extraction treatment method.
The relation model of the small molecular ion concentration and the chemical agent amount is constructed according to the adsorption kinetics principle and the material balance principle in the neutralization and precipitation process, and comprises the following steps:
Because the COD value refers to the amount of oxidant consumed by reducing substances which are easily oxidized by strong oxidant in the water body, the value of the substances is usually calculated into the amount of oxygen (the unit is mg/L), the COD value is an important comprehensive index for evaluating the pollution degree of the water body and reflects the pollution condition of the water body by the reducing substances (organic pollutants) to a certain degree. And acquiring the COD value chemically treated at the current moment based on the COD detection device.
Obtaining the reliability of sewage treatment according to the COD value and the filter attenuation index in the sewage at the current moment, and if the reliability is greater than a degree threshold value, evaluating the sewage treatment result at the current moment as excellent, which indicates that the reliability of normal use of the treated reclaimed water is stronger; if the reliability degree is smaller than the degree threshold value, the sewage treatment result at the current moment is evaluated to be poor, and some machines in a factory are possibly abnormal, so that some substances in the production line are mixed into the sewage, and the sewage is not cleaned up through filtering and chemical treatment. When the situation occurs, the type of the residual substances in the treated water is firstly detected, and the problem of the machine is judged according to the type of the substances, and the machine is repaired in a targeted manner.
The reliability of the sewage treatment is expressed by a formula as follows:
wherein U2 represents the reliability of sewage treatment,
the index of the filter attenuation index corresponding to the ith moment is represented;
the COD value in the sewage corresponding to the ith moment is shown, and the smaller the value is, the stronger the reliability of normal use of the treated water is.
If the filter attenuation index corresponding to the current moment is larger than the first threshold, the filter does not reach the time needing to be replaced at the current moment, the filter is not needed to be replaced by related workers, chemical-treated chemical plant sewage is directly obtained, and the sewage treatment result evaluation is obtained according to the same method in the steps.
Finally, if the set time period corresponding to the current time belongs to the second group, the content of impurities in the internalization factory sewage in the set time period corresponding to the current time is low, and the consumption speed of the filter is slow, so that the filter only needs to be replaced at a certain time on time.
Meanwhile, if the filter attenuation index corresponding to the current moment is smaller than the second threshold, the filter is required to be replaced by related workers when the filter is required to be replaced at the current moment, chemically treated chemical plant sewage is obtained after the filter is replaced, and the sewage treatment result evaluation is obtained according to the same method in the steps.
And if the filter attenuation index corresponding to the current moment is larger than the second threshold, indicating that the filter does not reach the time required to be replaced at the current moment, directly obtaining chemically treated chemical plant sewage without replacing the filter by related workers, and obtaining the sewage treatment result evaluation according to the same method in the steps.
It should be noted that, in this embodiment, the value of the first threshold is 0.8, the value of the second threshold is 0.9, and the value of the degree threshold is 0.8, and the implementer of the values of the thresholds may set the values according to actual situations. And the value of the first threshold and the value of the second threshold can be acquired by an implementer according to the data of each historical moment. Meanwhile, the acquisition methods for evaluating the sewage treatment results of the chemically treated chemical plant sewage are the same.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (2)
1. A chemical plant sewage treatment result evaluation method is characterized by comprising the following steps:
respectively collecting chemical plant sewage with preset volume at different moments in each set time period, and simultaneously collecting filtered chemical plant sewage; acquiring the difference value of the heavy metal content of chemical plant sewage with a preset volume before and after filtration to obtain the heavy metal difference at different moments in a set time period; acquiring a difference value of SS values of chemical plant sewage with a preset volume before and after filtration to obtain SS value differences at different moments in a set time period;
according to the mean value of the heavy metal difference and the mean value of the SS value difference at all the moments in the set time period, obtaining the sewage filtering difficulty evaluation index in the set time period, which specifically comprises the following steps:
wherein the content of the first and second substances,
is the evaluation index of the filtration difficulty of the sewage in the a-th set time period,
represents the mean value of the heavy metal difference at all the moments in the a-th set time period,
shows a sequence formed by heavy metal differences at all times in the a-th set time period,
represents the average value of the SS value differences at all times within the ith set period,
a sequence formed by SS value differences of all the moments in the a-th set time period;
calculating the similarity index of the sewage filtration difficulty evaluation indexes in any two time periods in all the set time periods, specifically comprising the following steps:
calculating the similarity index of the sewage filtration difficulty evaluation index according to the reciprocal of the difference value of the sewage filtration difficulty evaluation indexes in any two set time periods; grouping all the set time periods according to the similarity indexes to obtain a first group and a second group;
according to the sewage filtering difficulty evaluation in the set time period, the ratio of the heavy metal content before and after filtering the sewage of the chemical plant at different times and the ratio of the SS value before and after filtering the sewage of the chemical plant at different times, calculating the attenuation index of the filtering agent, specifically:
wherein, the first and the second end of the pipe are connected with each other,
showing the index of the filter attenuation index corresponding to the ith moment in the a-th set time period,
and
respectively representing the heavy metal content of the chemical plant sewage before and after filtration at the ith moment in the a-th set time period,
and
respectively representing SS values before and after filtration of chemical plant sewage at the ith time in the a-th set time period;
if the set time period corresponding to the current moment belongs to the first group and the filter attenuation index corresponding to the current moment is smaller than a first threshold value, the COD value in the chemically treated chemical plant sewage is obtained after the filter is replaced, and the sewage treatment result evaluation is obtained according to the COD value and the filter attenuation index; if the filter attenuation index corresponding to the current moment is larger than the first threshold value, directly obtaining the COD value in the chemically treated chemical plant sewage, and obtaining sewage treatment result evaluation according to the COD value and the filter attenuation index;
if the set time period corresponding to the current moment belongs to the second group and the filter attenuation index corresponding to the current moment is smaller than the second threshold value, the COD value in the chemically treated chemical plant sewage is obtained after the filter is replaced, and the sewage treatment result evaluation is obtained according to the COD value and the filter attenuation index; if the filter attenuation index corresponding to the current moment is larger than a second threshold value, directly obtaining the COD value in the chemically treated chemical plant sewage, and evaluating the sewage treatment result according to the COD value and the filter attenuation index;
wherein, the evaluation of the sewage treatment result obtained according to the COD value and the filter attenuation index specifically comprises the following steps: obtaining the reliability of sewage treatment according to the COD value and the filter attenuation index in the sewage at the current moment, and if the reliability is greater than a degree threshold value, evaluating the sewage treatment result at the current moment as excellent; and if the reliability degree is less than the degree threshold value, evaluating the sewage treatment result at the current moment as poor.
2. The method for evaluating the sewage treatment result of a chemical plant according to claim 1, wherein the set time period corresponding to the current time specifically comprises: the length of time between when the chemical plant starts to perform the sewage treatment and the present time.
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