CN107992973B - Method for optimizing industrial park water pollution control scheme - Google Patents
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Abstract
The invention relates to the field of water pollution and treatment prediction methods, in particular to an optimization method of a water pollution prevention scheme in an industrial park, which mainly comprises the steps of firstly determining an initial scheme, including industrial layout and a take-over standard; secondly, calculating each estimator according to Monte Carlo; screening the double standard-reaching technical route again; the comparison was then analyzed and the protocol readjusted. The invention recommends an optimal water pollution prevention and control scheme for the industrial park, strengthens the control of the water pollution source head of the industrial park on the premise of stable standard-reaching effluent of a tail-end sewage treatment plant, and plays a role in multi-party cooperative emission reduction, thereby realizing multi-link and multi-factor co-optimization and achieving better water pollution prevention and control effect.
Description
Technical Field
The invention belongs to the field of water pollution and treatment prediction methods, and relates to an optimization method of a water pollution prevention scheme in an industrial park.
Background
As a planning and management means, the industrial park effectively promotes the industrial reasonability and orderliness, and becomes the important growth of the economic and social development of China. With the continuous enhancement of the construction of industrial parks, the industrial parks gradually become a high point of the industrial wastewater discharge and the environmental pollution accidents. Therefore, the prevention and control of water pollution in industrial parks become the key content of water environment pollution treatment in China. The industrial park water pollution prevention and control relates to a plurality of links such as enterprise wastewater pretreatment, tail end sewage plant centralized treatment, regeneration water plant advanced treatment and the like, all links are mutually linked and cooperated, a plurality of factors such as an industrial layout structure, a take-over standard and the like directly influence the water pollution treatment cost and the treatment effect, the water pollution prevention and control scheme not only considers the link of multiple links, but also considers the optimization of multiple factors, and the synergistic effect of all links is played.
The industrial park water pollution control has the characteristics of specificity, systematicness, complexity and the like, and the water pollution control scheme needs to consider multi-link and multi-factor optimization and cooperation. At present, a method for predicting the water pollution treatment effect of a newly-built industrial park based on a Monte Carlo method, which is disclosed as Chinese patent No. 2017108162120, and a technical route decision method for preventing and controlling water pollution of the industrial park, which is disclosed as Chinese patent No. 2017107644412, are established, and the invention further considers the synergistic effect of multiple links and multiple factors on the basis of the two background technologies to establish an optimization method for the water pollution prevention and control scheme of the industrial park.
Disclosure of Invention
The invention aims to further optimize the industrial layout and the takeover standard of the park, enhance the pollution source control and multi-link cooperative emission reduction, and provide an optimization method of the water pollution prevention and control scheme of the industrial park, thereby realizing the optimization of the water pollution prevention and control scheme and the water pollution prevention and control effect.
The technical scheme of the invention is an optimization method of a water pollution prevention scheme in an industrial park, which comprises the following steps:
s1: setting an initial industrial layout and an initial take-over standard according to a newly-built industrial park planning scheme and a water pollution prevention and control requirement as an initial water pollution prevention and control scheme of an industrial park, and simultaneously setting a concentrated treatment effluent discharge standard of a sewage treatment plant at the tail end of the park according to an area where the industrial park is located;
s2: utilizing a unit output value wastewater quantity method, and predicting a value G according to a total output value of an industry i in an industry layout schemei(ten thousand yuan/year) industry i unit total output wastewater discharge statistical data Ki(cubic meter per ten thousand yuan), calculating the total wastewater discharge Q of the industry i1，i(cubic meter/year):
Q1，i＝GiKi
distributing the total wastewater discharge amount of the industry i in equal proportion (1:1:1:1) to four types of enterprises with different scales, wherein the annual average daily treatment capacity of the pretreatment facility is 100, 500, 1000 and 5000 cubic meters per day;
s3: calculating by using a Monte Carlo method, simulating the operation of the industrial park water pollution control system by random simulation and statistical experimental means, and predicting the water pollution treatment effect of all technical combinations under the current scheme;
s4: directly eliminating technical combinations with the standard reaching rate of the tail end effluent and the standard reaching rate of the enterprise effluent being less than the minimum requirement, and screening a double standard reaching technical route with the stable standard reaching of the tail end effluent and the stable standard reaching of the enterprise effluent;
s5: optimizing an industrial layout scheme:
1) selecting one industry, increasing the output value by 20%, correspondingly and equally reducing the output values of the other industries, keeping the total output value of the garden unchanged, and sequentially increasing the output value of each industry according to the mode to form a plurality of alternative industry layout schemes;
2) repeating the steps S2, S3 and S4, and calculating the average value of the terminal effluent standard-reaching rate of all the double standard-reaching technical routes under each set of industrial layout scheme;
3) comparing the average value of the standard-reaching rate of the tail-end effluent under each industrial layout scheme; the higher the value is, the lower the environmental risk is under the condition that the total industrial value of the park is not changed, and the better the corresponding industrial layout scheme is;
4) selecting an industrial layout scheme with the highest average value of the standard-reaching rate of the tail end effluent as an optimal scheme and as an initial scheme for the take-over standard optimization;
s6: optimizing the take-over standard:
1) taking the initial takeover standard set in the step S1 and the optimized industry layout scheme in the step S5 as initial schemes of the step;
2) repeating S4, screening the double standard-reaching technical routes under the current takeover standard, and calculating the average value of the treatment cost of all the double standard-reaching technical routes and the average value of the effluent concentration of pollutants in various industries;
3) and adjusting the pipe connection standard according to the calculated effluent concentration mean value of each industry pollutant, considering the characteristics of the industry wastewater: for the industry with high wastewater toxicity, the pollutant effluent concentration limit value in the connection standard can be reduced to the calculated mean value, a new connection standard is formed, and meanwhile, the connection standard of the industry with low wastewater toxicity is properly relaxed so as to reduce the total pollutant cost;
4) and repeating S4 according to the new takeover standard, calculating the mean value of the processing cost of all the double standard-reaching technical routes under the new scheme, and selecting the takeover standard with the lowest mean value of the processing cost as the optimal scheme.
The four types of enterprises with different scales in the S2 are distributed according to the principle that when the total water volume cannot meet 1:1:1:1, the water volume is preferentially distributed to the enterprises with small processing scales; if the residual water amount is less than 100 cubic meters per day, the residual water amount is directly distributed to enterprises with the smallest scale according to 100 cubic meters per day.
The main process of the Monte Carlo method in the S3 comprises the following steps: (1) randomly sampling the amount of wastewater generated by an enterprise, the concentration of pollutants and the pollutant removal rate of sewage treatment technology in each link according to the probability distribution type obtained by statistics in a value range; (2) calculating the effluent concentration of pollutants in each water treatment link; (3) repeating the random test for more than 5000 times by means of a computer system; (4) and counting the random test result to obtain the pollutant effluent concentration, the pollutant reduction amount, the tail end effluent standard reaching rate and the treatment cost of each link of each technical route.
The invention has the beneficial effects that:
1. the invention recommends an optimal water pollution prevention and control scheme for the industrial park, strengthens the control of the water pollution source head of the industrial park on the premise of stable standard-reaching effluent of a tail-end sewage treatment plant, and plays a role in multi-party cooperative emission reduction, thereby realizing multi-link and multi-factor co-optimization and achieving better water pollution prevention and control effect.
2. The optimized layout has the advantages that the average value of the processing cost is reduced, the synergistic emission reduction effect of each industry under the new scheme is better, and the optimization of the takeover standard is successful.
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FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated by the following figures. The examples are intended to better enable those skilled in the art to better understand the present invention and are not intended to limit the present invention in any way.
The embodiments are described in detail below with reference to examples.
The process flow diagram of the present invention is shown in FIG. 1. Assuming a new integrated industrial park, the total planned value of the park is 240 yen/year, and the planning industry comprises 8 industries of chemical raw material and chemical product manufacturing, rubber and plastic product manufacturing, food, beverage processing and manufacturing, textile industry, paper and paper product industry, medicine manufacturing, metal product and machining industry, computer, communication and other electronic equipment manufacturing industry; the emission standard of the terminal sewage treatment plant adopts the discharge standard of pollutants for urban sewage treatment plants (GB 18918-2002).
The method comprises the following steps: an initial water pollution control scheme is set according to a primary industrial planning scheme in a park, as shown in table 1:
assuming that the planned total yield of the campus is evenly distributed to 8 industries of chemical raw materials and chemical product manufacturing, rubber and plastic product manufacturing, food and beverage processing manufacturing, textile industry, paper and paper product industry, medicine manufacturing, metal and machine processing industry and computer, communication and other electronic equipment manufacturing, namely the planned yield of each industry is 30 billion yuan/year; due to the lack of relevant standards of enterprise wastewater discharge, the discharge standard of enterprise pretreatment is often referred to the discharge standard of town drainage systems discharged into secondary sewage treatment plants (namely, the third-level standard in the integrated wastewater discharge standard GB 8978-1996), and only COD (chemical oxygen demand) which is a pollutant index is supposed to be considered.
The initial scheme is set as follows:
TABLE 1 initial protocol
Step two: the total industrial output wastewater discharge of each industry unit is calculated according to the Chinese statistical yearbook data in 2011, as shown in Table 2, and according to Q1，i＝GiKiCalculating the total discharge Q of the wastewater of the industry i1，i(cubic meter/year):
TABLE 2 Total wastewater discharge from various industries
The method is characterized in that the discharge amount of wastewater of each industry is distributed into four types of large-scale enterprises with the annual average daily treatment capacity of 100, 500, 1000 and 5000 cubic meters/day in equal proportion, and the enterprises with small treatment scale are preferentially distributed. Taking the manufacturing industry of chemical raw materials and chemical products as an example, the quantity of four types of large-scale enterprises is respectively 8, 3 and 0, the total amount of wastewater is 5300 cubic meters per day, the predicted value is 0.03 percent lower, and the error can be ignored; taking the textile industry as an example, the number of four types of large-scale enterprises is respectively 6, 1 and 1, the total wastewater output value is 7100 cubic meters per day, which is 0.33 percent higher than the predicted value, and the error can be ignored. Other industries adopt the same approach to distribution.
Step three: calculating by using a Monte Carlo method: randomly sampling the amount of wastewater generated by an enterprise, the concentration of pollutants and the pollutant removal rate of sewage treatment technology in each link according to the probability distribution type obtained by statistics in a value range; calculating the effluent concentration of pollutants in each water treatment link; repeating the random test for more than 5000 times by means of a computer system; and counting the random test result to obtain the estimation quantities of pollutant effluent concentration, pollutant reduction, tail end effluent standard reaching rate, treatment cost and the like of each link of each technical route.
Assuming that 5, 5 and 4 optional technologies are available in three links of enterprise pretreatment, tail-end sewage plant centralized treatment and regeneration water plant advanced treatment, under the current scheme, 5 industries are formed by 8 industries8The combination of 7812500 techniques, that is, 7812500 technical routes are formed. By means of a computer system, random tests are repeatedly carried out on each technical route for more than 5000 times by using a Monte Carlo method, and the estimation quantities of pollutant effluent concentration, pollutant reduction, tail end effluent standard reaching rate, treatment cost and the like of each link of each technical route are obtained.
Step four: according to the set minimum requirements of the tail end effluent standard-reaching rate and the enterprise effluent standard-reaching rate, the 7812500 technical routes are screened, and a double standard-reaching technical route with the tail end effluent stably reaching the standard and the enterprise effluent stably reaching the standard is selected. And (5) screening 50 double standard-reaching technical routes under the assumption that the standard-reaching rate of the tail end water and the minimum requirement of the standard-reaching rate of the enterprise water are both set to 80%.
Step five: optimizing the industrial layout:
1) forming an alternative industrial layout scheme as shown in table 3:
first, the expected yield of chemical raw materials and chemicals manufacturing industry is increased by 20-36 million yuan per year, the other seven industries all reduce the yield by 6/7-0.86 million yuan per year, and the adjusted yield is 29.14 million yuan per year. After the scheme is adjusted, the total value of 8 industries is 239.98 billion yuan, and the error is negligible. This scheme is alternative industrial layout scheme 1.
Table 3 alternative industry layout scheme 1
According to the same method, 7 industries of rubber and plastic products industry, food, beverage processing and manufacturing industry, textile industry, paper and paper products industry, medicine manufacturing industry, metal products and machining industry and computer, communication and other electronic equipment manufacturing industry are sequentially increased by 20 percent to form alternative industry layout schemes 2-8.
2) And according to the alternative industry layout schemes 1-8, repeating the second, third and fourth steps, and calculating the average value of the terminal effluent standard-reaching rate of all the double standard-reaching technical routes under each set of industry layout scheme:
assuming that the calculation results of the average of the end effluent standard-reaching rates of all the dual standard-reaching technical routes under each industrial layout scheme are shown in the following table 4:
TABLE 4 mean stable standard-reaching rate of tail-end effluent
| Industrial layout scheme | Number of technical route up to two standards | Mean value of terminal effluent stable standard-reaching rate (%) |
| Initial protocol | 50 | 86.3 |
| Alternative 1 | 32 | 85.6 |
| Alternative 2 | 43 | 85.8 |
| Alternative 3 | 52 | 88.3 |
| Alternative 4 | 46 | 87.0 |
| Alternative 5 | 60 | 86.2 |
| Alternative 6 | 44 | 86.6 |
| Alternative 7 | 59 | 88.1 |
| Alternative 8 | 61 | 87.2 |
3) Comparing the average value of the standard-reaching rate of the tail-end effluent under each industrial layout scheme, wherein the higher the value is, the lower the environmental risk is under the condition that the total industrial value of the park is not changed, and the better the corresponding industrial layout scheme is. According to the results in table 4, the number of the double standard-reaching technical routes in the alternative 3 is 52, the average value of the stable standard-reaching rate of the tail end effluent is 88.3%, and the average value is the maximum value in the initial scheme and 8 sets of alternatives, which indicates that the alternative 3 is the optimal industrial layout scheme, i.e. the environmental risk of the alternative 3 is the minimum on the premise of keeping the total expected yield of the garden.
4) And selecting an industrial layout alternative 3 as an optimal scheme and taking over an initial scheme of standard optimization.
Step six: optimizing the take-over standard:
1) and generating a new scheme according to the industrial layout optimization result of the step five as shown in the table 5:
table 5 take over standard protocol 1
2) And Monte Carlo calculation under the takeover standard scheme 1 is completed in the fifth step, after screening, 52 double standard-reaching technical routes under the current takeover standard are provided, and the average value of the treatment cost and the average value of the effluent concentration of pollutants in each industry are calculated according to the estimated quantity of the 52 double standard-reaching technical routes. Assuming that the average value of the total treatment cost of 52 double standard-reaching technical routes is 3792.6 ten thousand yuan/year through calculation, the average value of the effluent concentration of pollutants (COD) in each industry is shown in the table 6.
Table 6 pollutant effluent concentration mean value over standard protocol 1
3) And adjusting the pipe connection standard according to the calculated effluent concentration mean value of each industry pollutant, considering the characteristics of the industry wastewater: for industries with high wastewater toxicity, such as chemical raw material and chemical product manufacturing industry, the pollutant emission limit value can be properly reduced to the COD effluent concentration, namely, the COD effluent concentration is reduced to 118.6 mg/L; meanwhile, the industry takeover standard of low wastewater concentration is properly relaxed to reduce the total treatment cost, such as increasing the COD emission limit value of the food and beverage processing and manufacturing industry to 121.2 mg/L. The adjusted takeover criteria was taken as takeover criteria protocol 2, as shown in table 7.
Table 7 take over standard protocol 2
4) And repeating the step four according to the new takeover standard, assuming that 48 double standard-reaching technical routes exist under the new takeover standard after screening, the average value of the treatment cost of the 48 double standard-reaching technical routes is 3789.3 ten thousand yuan/year, and the average value of the effluent concentration of pollutants in each industry is shown in table 8. Compared with the takeover standard schemes 1 and 2, the cost of the scheme 2 is reduced by 3.3 ten thousand yuan/year compared with the mean value of the treatment cost reduced by the scheme 1, which shows that the synergistic emission reduction effect of each industry under the scheme 2 is better, and the takeover standard optimization is successful.
Table 8 pollutant effluent concentration mean value over standard protocol 2
And repeating the third step and the fourth step on the basis of taking over the standard scheme 2 until the average value of the treatment cost is not reduced.
It should be understood that the embodiments and examples discussed herein are illustrative only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims.
Claims (3)
1. The method for optimizing the water pollution prevention and control scheme of the industrial park is characterized by comprising the following steps of:
s1: setting an initial industrial layout and an initial take-over standard according to a newly-built industrial park planning scheme and a water pollution prevention and control requirement as an initial water pollution prevention and control scheme of an industrial park, and simultaneously setting a concentrated treatment effluent discharge standard of a sewage treatment plant at the tail end of the park according to an area where the industrial park is located;
s2: utilizing a unit output value wastewater quantity method, and predicting a value G according to a total output value of an industry i in an industry layout schemei(ten thousand yuan/year) industry i unit total output wastewater discharge statistical data Ki(cubic meter per ten thousand yuan), calculating the total wastewater discharge Q of the industry i1，i(cubic meter/year):
Q1，i＝GK
distributing the total wastewater discharge amount of the industry i to four types of enterprises with different scales, wherein the annual average daily treatment capacity of the pretreatment facility is 100, 500, 1000 and 5000 cubic meters per day in an equal ratio of 1:1:1: 1;
s3: calculating by using a Monte Carlo method, simulating the operation of the industrial park water pollution control system by random simulation and statistical experimental means, and predicting the water pollution treatment effect of all technical combinations under the current scheme;
s4: directly eliminating technical combinations with the standard reaching rate of the tail end effluent and the standard reaching rate of the enterprise effluent being less than the minimum requirement, and screening a double standard reaching technical route with the stable standard reaching of the tail end effluent and the stable standard reaching of the enterprise effluent;
s5: optimizing an industrial layout scheme:
1) selecting one industry, increasing the output value by 20%, correspondingly and equally reducing the output values of the other industries, keeping the total output value of the garden unchanged, and sequentially increasing the output value of each industry according to the mode to form a plurality of alternative industry layout schemes;
2) repeating the steps S2, S3 and S4, and calculating the average value of the terminal effluent standard-reaching rate of all the double standard-reaching technical routes under each set of industrial layout scheme;
3) comparing the average value of the standard-reaching rate of the tail-end effluent under each industrial layout scheme;
4) selecting an industrial layout scheme with the highest average value of the standard-reaching rate of the tail end effluent as an optimal scheme and as an initial scheme for the take-over standard optimization;
s6: optimizing the take-over standard:
1) taking the initial takeover standard set in the step S1 and the optimized industry layout scheme in the step S5 as initial schemes of the step;
2) repeating S4, screening the double standard-reaching technical routes under the current takeover standard, and calculating the average value of the treatment cost of all the double standard-reaching technical routes and the average value of the effluent concentration of pollutants in various industries;
3) and adjusting the pipe connection standard according to the calculated effluent concentration mean value of each industry pollutant, considering the characteristics of the industry wastewater: for the industry with high wastewater toxicity, the pollutant effluent concentration limit value in the connection standard can be reduced to the calculated mean value, a new connection standard is formed, and meanwhile, the connection standard of the industry with low wastewater toxicity is properly relaxed so as to reduce the total pollutant cost;
4) and repeating S4 according to the new takeover standard, calculating the mean value of the processing cost of all the double standard-reaching technical routes under the new scheme, and selecting the takeover standard with the lowest mean value of the processing cost as the optimal scheme.
2. The method according to claim 1, wherein the four types of enterprises with different sizes in the step S2 are allocated according to the principle that when the total water amount cannot satisfy 1:1:1:1, the water amount is preferentially allocated to enterprises with small processing sizes; if the residual water amount is less than 100 cubic meters per day, the residual water amount is directly distributed to enterprises with the smallest scale according to 100 cubic meters per day.
3. The method according to claim 1, wherein the main process of the monte carlo method in S3 includes: (1) randomly sampling the amount of wastewater generated by an enterprise, the concentration of pollutants and the pollutant removal rate of sewage treatment technology in each link according to the probability distribution type obtained by statistics in a value range; (2) calculating the effluent concentration of pollutants in each water treatment link; (3) repeating the random test for more than 5000 times by means of a computer system; (4) and counting the random test result to obtain the pollutant effluent concentration, the pollutant reduction amount, the tail end effluent standard reaching rate and the treatment cost of each link of each technical route.
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| CN111680845B (en) * | 2020-06-15 | 2021-03-19 | 生态环境部南京环境科学研究所 | Water pollution discharge and water environment management system |
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