CN114706438A - Sewage treatment control system and method - Google Patents

Sewage treatment control system and method Download PDF

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CN114706438A
CN114706438A CN202210553775.6A CN202210553775A CN114706438A CN 114706438 A CN114706438 A CN 114706438A CN 202210553775 A CN202210553775 A CN 202210553775A CN 114706438 A CN114706438 A CN 114706438A
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value
sewage treatment
adjusting
sewage
oxygen content
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CN114706438B (en
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郭雷
张硌
胡婵娟
高红莉
胡军周
李洪涛
牛晓青
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Institute Of Geographical Sciences Henan Academy Of Sciences
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
    • G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Hydrology & Water Resources (AREA)
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Abstract

The invention discloses a sewage treatment control system and a method, wherein a data acquisition unit is used for acquiring environmental data and water quality data of sewage in a reaction container, a modeling unit establishes a sewage treatment environment-time database, a computing unit computes sewage treatment time under current sewage treatment environmental data according to the acquired current sewage treatment environmental data and the sewage treatment environment-time database, and an adjusting unit adjusts the current sewage treatment environmental data to realize sewage treatment within preset time. The system has simple structure and small occupied area, accurately estimates the sewage treatment time by adopting a reconstruction function based on the environmental data of a plurality of adjacent sampling points in the database, and can ensure that the simple treatment of the sewage can be quickly completed.

Description

Sewage treatment control system and method
Technical Field
The invention belongs to the field of sewage treatment, and particularly relates to a sewage treatment control system and method.
Background
The sewage biochemical treatment system comprises a plurality of complex dynamic biochemical reactions, is complicated, occupies a large area, has a high construction period and cost, and is difficult to adapt to remote areas, areas with low population density or other places needing temporary rapid sewage treatment.
Disclosure of Invention
The invention provides a sewage treatment control system aiming at the problem that a sewage treatment system is difficult to carry out sewage primary treatment quickly and simply. The system comprises a data acquisition unit, a modeling unit, a calculation unit, a central control unit and an adjusting unit; the data acquisition unit is used for acquiring environmental data and water quality data of sewage in the reaction container, the modeling unit establishes a sewage treatment environment-time database, the computing unit computes sewage treatment time under the current sewage treatment environment data according to the acquired current sewage treatment environment data and the sewage treatment environment-time database, the adjusting unit adjusts the current sewage treatment environment data, and the current sewage treatment environment data comprise a PH value, a temperature and an oxygen content.
Preferably, before the official sewage treatment is started, the data acquisition unit acquires sample sewage treatment environment data, the central control unit determines sample sewage treatment time when the sewage treatment reaches the standard according to the water quality data, and the sewage treatment environment-time database comprises the sample sewage treatment environment data and the sample sewage treatment time.
Preferably, the adjusting unit comprises a judging module and an executing module, the judging module is used for judging whether the current sewage treatment time is longer than a preset time, and the executing module comprises a PH value adjusting module, a temperature adjusting module and an oxygen content adjusting module.
Preferably, the data acquisition unit comprises a temperature detection sensor, a pH value detection sensor, an oxygen content detection sensor and a water quality detection sensor.
Also provides a sewage treatment control method, which is applied to a sewage treatment control system and comprises the following steps:
s1, flowing a first volume of sewage to be treated into the reaction container, and establishing a sewage treatment environment-time database;
s2, acquiring sampling environment data of sewage flowing into the reaction container, and calculating sewage treatment time corresponding to the sampling environment data based on the sampling environment data and the sewage treatment environment-time database; wherein the environmental data comprises the pH value, the temperature and the oxygen content of the sewage to be treated;
s3, judging whether the sewage treatment time is greater than the preset time, if so, executing a step S4, otherwise, not adjusting the sewage treatment environment;
s4, adjusting the sampling environment data according to the preset interval, and executing the step S2.
Preferably, the predetermined interval includes: a first predetermined interval for adjusting the PH, a second predetermined interval for adjusting the temperature, and a third predetermined interval for adjusting the oxygen content.
Preferably, the establishing of the sewage treatment environment-time database specifically includes:
s11, adjusting the pH value of the sewage in the reaction container to the minimum value of the pH value adjusting range, adjusting the temperature to the minimum value of the temperature adjusting range, and adjusting the oxygen content to the minimum value of the oxygen content adjusting range;
s12, acquiring environmental data of sewage and sewage treatment time when the water quality meets the standard; determining the pH value at the moment to be a first pH value, the temperature at the moment to be a first temperature, and the oxygen content at the moment to be a first oxygen content;
s13, discharging the sewage reaching the standard, and then flowing the sewage to be treated with a first volume into the reaction container;
s14, judging whether the second pH value is larger than the maximum value of the pH value adjusting range or not, if so, executing S15, otherwise, adjusting the pH value of the sewage in the reaction container to the second pH value, adjusting the temperature to the minimum value of the temperature adjusting range, and executing S12 after the oxygen content is adjusted to the minimum value of the oxygen content adjusting range;
s15, judging whether the second temperature is larger than the maximum value of the temperature adjusting range or not, if so, executing S16, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the PH value adjusting range, adjusting the temperature to the second temperature, and executing S12 after the oxygen content is adjusted to the minimum value of the oxygen content adjusting range;
s16, determining whether the second oxygen content is larger than the maximum value of the adjustment range of the oxygen content, if so, executing S17, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the adjustment range of the PH value, adjusting the temperature to the minimum value of the adjustment range of the temperature, adjusting the oxygen content to the second oxygen content, and executing S12;
and S17, establishing a sewage treatment environment-time database according to the acquired different environment data and the corresponding sewage treatment time.
The calculation of the sewage treatment time specifically comprises the following steps:
s21, sampling the sewage to be treated to obtain a sampling point Q of the sewage environment data0(x0，y0，z0) Selecting a known point Q of the environmental data in the sewage treatment environment-time databasei(xi，yi，zi) Known point QiCorresponding sewage treatment time is tiWherein x is0For the pH value, y, of the sampled sewage to be treated0For the temperature of the sampled sewage to be treated, z0The oxygen content of the sampled sewage to be treated; x is the number ofiIs the pH value, y, of the wastewater in the databaseiIs the temperature of the waste water in the database, ziThe content of oxygen in the sewage in the database is shown, and i is a positive integer;
s22, calculating a sampling point Q0And a known point QiA distance r ofiIs composed of
Figure BDA0003651559180000031
S23, dividing the distance riIn a row from small to largeSequence of dividing said distance riMinimum seven known points Q1(x1， y1，z1)、Q2(x2，y2，z2)、Q3(x3，y3，z3)、Q4(x4，y4，z4)、Q5(x5，y5， z5)、Q6(x6，y6，z6) And Q7(x7，y7，z7) Determining as a reference point;
s24, calculating a sampling point Q according to the seven reference points, the sampling points and a preset reconstruction function0Corresponding sewage treatment time t0。
Preferably, the step S24 specifically includes:
s241, calculating the coefficient of the reconstruction function according to the seven reference points and a preset reconstruction function to obtain a reconstruction function expression, wherein the preset reconstruction function t of the sewage treatment environment-time database is as follows:
t＝a0+a1x+a2y+a3z+a4xy+a5yz+a6xz+a7xyz；
wherein a is0-a7The function coefficient is shown, x is the PH value of the sewage treatment environment, y is the temperature, z is the oxygen content, and t is the sewage treatment time when the water quality reaches the standard;
s242, calculating the sewage treatment time t corresponding to the sampling point according to the sampling point and the reconstruction function expression0。
Preferably, the adjusting the sampling environment data according to the predetermined interval specifically includes:
s41, adjusting the pH value of the sewage to be treated according to the first preset interval, and obtaining a minimum pH value adjustment value which is not more than the preset time and corresponds to the sewage treatment time after the pH value is adjusted; calculating the lowest pH value adjusting cost according to the unit cost of pH value adjustment and the minimum pH value adjusting value;
s42, adjusting the temperature of the sewage to be treated according to a second preset interval to obtain a minimum temperature adjustment value corresponding to the preset time, wherein the sewage treatment time after the temperature is adjusted is not more than the preset time; calculating the minimum temperature adjustment cost according to the unit cost of temperature adjustment and the minimum temperature adjustment value;
s43, adjusting the oxygen content of the sewage to be treated according to a third preset interval, and obtaining that the sewage treatment time after the oxygen content is adjusted is not more than the minimum oxygen content adjusting value corresponding to the preset time; calculating the lowest oxygen content adjusting cost according to the unit cost of the oxygen content adjustment and the minimum oxygen content adjusting value;
and S44, obtaining an adjusting scheme with the lowest adjusting cost according to the lowest PH value adjusting cost, the lowest temperature adjusting cost and the lowest oxygen content adjusting cost.
Compared with the prior art, the invention has the beneficial effects that:
(1) the system has simple structure and small occupied area, and can be suitable for various places needing preliminary sewage treatment temporarily and for simple sewage treatment in remote areas or sparsely populated areas;
(2) before sewage treatment, a database matched with sewage to be treated is established based on sewage conditions, sewage treatment time can be quickly calculated in a subsequent sewage treatment process, and the sewage treatment process is completed within preset time by adjusting a sewage treatment environment;
(3) the reconstruction function is adopted to accurately estimate the sewage treatment time, and the simple treatment of the sewage can be ensured to be rapidly completed.
Drawings
FIG. 1 is a block diagram of a sewage treatment control system according to the present invention;
FIG. 2 is a flow chart of a wastewater treatment control method according to the present invention;
FIG. 3 is a flow chart of establishing a sewage treatment environment-time database according to the present invention;
FIG. 4 is a flow chart of calculating a wastewater treatment time corresponding to the sampled environmental data according to the present invention;
FIG. 5 is a flow chart of the present invention for determining a lowest cost adjustment scheme.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment:
FIG. 1 is a block diagram of a sewage treatment control system of the present invention.
The invention provides a sewage treatment control system, which comprises a data acquisition unit, a modeling unit, a calculation unit, a central control unit and an adjusting unit, wherein the data acquisition unit is used for acquiring data; the data acquisition unit is used for acquiring environmental data and water quality data of sewage in the reaction container, the modeling unit establishes a sewage treatment environment-time database, the computing unit computes sewage treatment time under the current sewage treatment environment data according to the acquired current sewage treatment environment data and the sewage treatment environment-time database, the adjusting unit adjusts the current sewage treatment environment data, and the current sewage treatment environment data comprise a PH value, a temperature and an oxygen content.
The modeling unit constructs a sewage treatment environment-time database based on the collected multiple groups of PH value, temperature and oxygen content data and corresponding sewage treatment time. And establishing a sewage treatment environment-time database. Before sewage treatment, a preset first volume of sewage to be treated is added into a reaction container, the pH value, the temperature and the oxygen content of the sewage in the reaction container are respectively adjusted according to a preset interval, and the corresponding pH value, the temperature and the oxygen content of the sewage are collected after each adjustment. If the PH value adjusting range is 3-11, adjusting the preset interval of the PH value to be 0.5, collecting the corresponding PH value, temperature and oxygen content under each adjusted PH value, and detecting the time required by the sewage treatment in the reaction container to reach the discharge standard in real time; the temperature adjusting range is 20-40 ℃, the preset interval of the temperature adjustment is 5 ℃, the corresponding PH value, temperature and oxygen content are collected under each adjusted temperature value, and the time required for the sewage treatment in the reaction container to reach the discharge standard is detected in real time; the oxygen content adjusting range is 0 to the dissolved oxygen concentration saturation value under the current temperature, the preset interval of the oxygen content is adjusted to be 0.5mg/L, the corresponding PH value, temperature and oxygen content are collected under each adjusted oxygen content, and the time required for the sewage treatment in the reaction container to reach the discharge standard is detected in real time. Since the saturated dissolved oxygen concentration in water is related to the water temperature and inversely proportional, i.e., the higher the water temperature, the lower the concentration of dissolved oxygen in water, the adjustment range is affected by the water temperature when adjusting the oxygen content. Table 1 shows the relationship between the saturated dissolved oxygen concentration in water and the temperature.
TABLE 1 relationship table of saturated dissolved oxygen concentration in water and temperature
Figure BDA0003651559180000051
Preferably, before the official sewage treatment is started, the data acquisition unit acquires sample sewage treatment environment data, the central control unit determines sample sewage treatment time when the sewage treatment reaches the standard according to the water quality data, and the sewage treatment environment-time database comprises the sample sewage treatment environment data and the sample sewage treatment time. When sewage is treated, the components of different sewage are different, and the components of the sewage discharged from the same area are relatively stable on the whole. Before sewage treatment, the sewage treatment environment of sewage to be treated and the corresponding sewage treatment time are detected, and the sewage treatment environment-time database is constructed, so that the database can be matched with the subsequent sewage to be treated.
Preferably, the adjusting unit comprises a judging module and an executing module, the judging module is used for judging whether the current sewage treatment time is longer than a preset time, and the executing module comprises a PH value adjusting module, a temperature adjusting module and an oxygen content adjusting module. In the sewage treatment process, the reaction container is kept full of sewage treatment raw materials (such as a nitrogen removal agent, a phosphorus removal agent, activated sludge and the like), and the sewage treatment time is related to the reaction time (such as pH value, temperature, oxygen content and the like).
Preferably, the data acquisition unit comprises a temperature detection sensor, a pH value detection sensor, an oxygen content detection sensor and a water quality detection sensor.
Second embodiment:
FIG. 2 is a flow chart of a wastewater treatment control method according to the present invention. The invention also provides a sewage treatment control method, which is applied to a sewage treatment control system and comprises the following steps:
s1, flowing a first volume of sewage to be treated into the reaction container, and establishing a sewage treatment environment-time database;
s2, acquiring sampling environment data of sewage flowing into the reaction container, and calculating sewage treatment time corresponding to the sampling environment data based on the sampling environment data and the sewage treatment environment-time database; wherein the environmental data comprises the pH value, the temperature and the oxygen content of the sewage to be treated;
s3, judging whether the sewage treatment time is greater than the preset time, if so, executing a step S4, otherwise, not adjusting the sewage treatment environment;
s4, adjusting the sampling environment data according to the preset interval, and executing the step S2.
Before sewage treatment, the sewage treatment environment of sewage to be treated and the corresponding sewage treatment time are detected, and the sewage treatment environment-time database is constructed, so that the database can be matched with the subsequent sewage to be treated. Through the sewage to be treated of the first volume that predetermines, when gathering the environmental data of sewage to be treated, can shorten sewage treatment and make the time that quality of water is up to standard, and then accelerate the establishment of database.
Preferably, the predetermined interval includes: a first predetermined interval for adjusting the PH, a second predetermined interval for adjusting the temperature, and a third predetermined interval for adjusting the oxygen content.
Preferably, fig. 3 is a flowchart of establishing a sewage treatment environment-time database according to the present invention. The establishment of the sewage treatment environment-time database specifically comprises the following steps:
s11, adjusting the pH value of the sewage in the reaction container to the minimum value of the pH value adjusting range, adjusting the temperature to the minimum value of the temperature adjusting range, and adjusting the oxygen content to the minimum value of the oxygen content adjusting range;
s12, acquiring environmental data of sewage and sewage treatment time when the water quality meets the standard; determining the pH value at the moment to be a first pH value, the temperature at the moment to be a first temperature, and the oxygen content at the moment to be a first oxygen content;
s13, discharging the sewage reaching the standard, and then flowing the sewage to be treated with the first volume into the reaction container;
s14, judging whether the second pH value is larger than the maximum value of the pH value adjusting range or not, if so, executing S15, otherwise, adjusting the pH value of the sewage in the reaction container to the second pH value, adjusting the temperature to the minimum value of the temperature adjusting range, and executing S12 after the oxygen content is adjusted to the minimum value of the oxygen content adjusting range;
s15, judging whether the second temperature is larger than the maximum value of the temperature adjusting range or not, if so, executing S16, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the PH value adjusting range, adjusting the temperature to the second temperature, and executing S12 after the oxygen content is adjusted to the minimum value of the oxygen content adjusting range;
s16, judging whether the second oxygen content is larger than the maximum value of the adjustment range of the oxygen content or not, if so, executing S17, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the adjustment range of the PH value, adjusting the temperature to the minimum value of the adjustment range of the temperature, adjusting the oxygen content to the second oxygen content, and executing S12;
s17, establishing a sewage treatment environment-time database according to the obtained different environmental data and the corresponding sewage treatment time.
The pH value adjusting range can be set to be 3-11, and the first preset interval is 0.5; the temperature adjusting range can be set to be 20-40 ℃, and the second preset interval is 0.5 ℃; the oxygen content adjusting range can be set to be 0 to the dissolved oxygen concentration saturation value at the current temperature, and the third preset interval is 0.5 mg/L.
Preferably, fig. 4 is a flowchart of calculating sewage treatment time corresponding to sampling environment data according to the present invention. The calculation of the sewage treatment time specifically comprises the following steps:
s21, sampling the sewage to be treated to obtain a sampling point Q of the sewage environment data0(x0，y0，z0) Selecting a known point Q of the environmental data in the sewage treatment environment-time databasei(xi，yi，zi) The known point QiCorresponding sewage treatment time is tiWherein x is0pH, y, of the sampled sewage to be treated0For the temperature of the sampled sewage to be treated, z0The oxygen content of the sampled sewage to be treated; x is the number ofiIs the pH value, y, of the wastewater in the databaseiIs the temperature of the waste water in the database, ziThe content of oxygen in the sewage in the database is shown, and i is a positive integer;
s22, calculating a sampling point Q0And a known point QiA distance r ofiIs composed of
Figure BDA0003651559180000081
S23, comparing the distance riThe distances r are sorted from small to largeiMinimum seven known points Q1(x1，y1，z1)、Q2(x2，y2，z2)、Q3(x3，y3，z3)、Q4(x4，y4，z4)、Q5(x5， y5，z5)、Q6(x6，y6，z6) And Q7(x7，y7，z7) Determining as a reference point;
s24, calculating a sampling point Q according to the seven reference points, the sampling points and a preset reconstruction function0Corresponding sewage treatment time t0。
Preferably, the step S24 specifically includes:
s241, calculating the coefficient of the reconstruction function according to the seven reference points and a preset reconstruction function to obtain a reconstruction function expression, wherein the preset reconstruction function t of the sewage treatment environment-time database is as follows:
t＝a0+a1x+a2y+a3z+a4xy+a5yz+a6xz+a7xyz；
wherein a is0-a7The function coefficient is shown, x is the PH value of the sewage treatment environment, y is the temperature, z is the oxygen content, and t is the sewage treatment time when the water quality reaches the standard;
s242, calculating the sewage treatment time t corresponding to the sampling point according to the sampling point and the reconstruction function expression0。
Preferably, FIG. 5 is a flow chart of the present invention for determining the lowest cost adjustment scheme. The adjusting the sampling environment data according to the predetermined interval specifically comprises:
s41, adjusting the pH value of the sewage to be treated according to the first preset interval to obtain a minimum pH value adjustment value corresponding to the preset time, wherein the sewage treatment time after the pH value is adjusted is not more than the preset time; calculating the lowest pH value adjusting cost according to the unit cost of pH value adjustment and the minimum pH value adjusting value;
s42, adjusting the temperature of the sewage to be treated according to a second preset interval to obtain a minimum temperature adjustment value corresponding to the preset time, wherein the sewage treatment time after the temperature is adjusted is not more than the preset time; calculating the minimum temperature adjustment cost according to the unit cost of temperature adjustment and the minimum temperature adjustment value;
s43, adjusting the oxygen content of the sewage to be treated according to a third preset interval, and obtaining that the sewage treatment time after the oxygen content is adjusted is not more than the minimum oxygen content adjusting value corresponding to the preset time; calculating the lowest oxygen content adjusting cost according to the unit cost of the oxygen content adjustment and the minimum oxygen content adjusting value;
and S44, obtaining an adjusting scheme with the lowest adjusting cost according to the lowest PH value adjusting cost, the lowest temperature adjusting cost and the lowest oxygen content adjusting cost.
The unit cost of the pH value adjustment is the cost of raw materials required for increasing or decreasing the pH value by 0.1, the pH value can be adjusted by adding water, acidic or alkaline raw materials into a reaction vessel, the pH value of the sewage with the pH value of 7 is increased to be not more than 7 or the pH value of the sewage with the pH value of more than 7 is reduced to be not less than 7, only water needs to be added, and the cost is negligible; the unit cost of temperature regulation is the cost consumed when the temperature rises or falls by 1 ℃, the temperature can be raised through electric heating, and the temperature can be lowered through injecting cold water; the unit cost of the oxygen content adjustment is the cost required for increasing or reducing 0.1mg/L of oxygen, the oxygen content of the sewage is increased by aerating the sewage, and a chemical oxygen scavenger is added into the sewage to reduce the oxygen content of the sewage.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (10)

1. A sewage treatment control system is characterized in that: the system comprises a data acquisition unit, a modeling unit, a calculation unit, a central control unit and an adjusting unit; the data acquisition unit is used for acquiring environmental data and water quality data of sewage in the reaction container, the modeling unit establishes a sewage treatment environment-time database, the computing unit computes sewage treatment time under the current sewage treatment environment data according to the acquired current sewage treatment environment data and the sewage treatment environment-time database, the adjusting unit adjusts the current sewage treatment environment data, and the current sewage treatment environment data comprise a PH value, a temperature and an oxygen content.
2. The wastewater treatment control system according to claim 1, wherein: before the formal sewage treatment is started, the data acquisition unit acquires sample sewage treatment environment data, the central control unit determines the sample sewage treatment time when the sewage treatment reaches the standard according to the water quality data, and the sewage treatment environment-time database comprises the sample sewage treatment environment data and the sample sewage treatment time.
3. The wastewater treatment control system according to claim 2, wherein: the adjusting unit comprises a judging module and an executing module, the judging module is used for judging whether the current sewage treatment time is longer than a preset time, and the executing module comprises a PH value adjusting module, a temperature adjusting module and an oxygen content adjusting module.
4. The wastewater treatment control system according to claim 3, wherein: the data acquisition unit comprises a temperature detection sensor, a PH value detection sensor, an oxygen content detection sensor and a water quality detection sensor.
5. A control method of the sewage treatment control system according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
s1, flowing a first volume of sewage to be treated into the reaction container, and establishing a sewage treatment environment-time database;
s2, acquiring sampling environment data of sewage flowing into the reaction container, and calculating sewage treatment time corresponding to the sampling environment data based on the sampling environment data and the sewage treatment environment-time database; wherein the environmental data comprises the pH value, the temperature and the oxygen content of the sewage to be treated;
s3, judging whether the sewage treatment time is greater than the preset time, if so, executing a step S4, otherwise, not adjusting the sewage treatment environment;
s4, adjusting the sampling environment data according to the preset interval, and executing the step S2.
6. The control method according to claim 5, characterized in that: the predetermined interval includes: a first predetermined interval for adjusting the PH, a second predetermined interval for adjusting the temperature, and a third predetermined interval for adjusting the oxygen content.
7. The control method according to claim 6, characterized in that: the establishment of the sewage treatment environment-time database specifically comprises the following steps:
s11, adjusting the pH value of the sewage in the reaction container to the minimum value of the pH value adjusting range, adjusting the temperature to the minimum value of the temperature adjusting range, and adjusting the oxygen content to the minimum value of the oxygen content adjusting range;
s12, acquiring environmental data of sewage and sewage treatment time when the water quality meets the standard; determining the pH value at the moment to be a first pH value, the temperature at the moment to be a first temperature, and the oxygen content at the moment to be a first oxygen content;
s13, discharging the sewage reaching the standard, and then flowing the sewage to be treated with the first volume into the reaction container;
s14, judging whether the second pH value is larger than the maximum value of the pH value adjusting range or not when the second pH value is the sum of the first pH value and the first preset interval, executing S15 if the second pH value is larger than the maximum value of the pH value adjusting range, otherwise, adjusting the pH value of the sewage in the reaction container to be the second pH value, adjusting the temperature to be the minimum value of the temperature adjusting range, and executing S12 after the oxygen content is adjusted to be the minimum value of the oxygen content adjusting range;
s15, judging whether the second temperature is larger than the maximum value of the temperature adjusting range or not, if so, executing S16, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the PH value adjusting range, adjusting the temperature to the second temperature, and executing S12 after the oxygen content is adjusted to the minimum value of the oxygen content adjusting range;
s16, judging whether the second oxygen content is larger than the maximum value of the adjustment range of the oxygen content or not, if so, executing S17, otherwise, adjusting the PH value of the sewage in the reaction container to the minimum value of the adjustment range of the PH value, adjusting the temperature to the minimum value of the adjustment range of the temperature, adjusting the oxygen content to the second oxygen content, and executing S12;
and S17, establishing a sewage treatment environment-time database according to the acquired different environment data and the corresponding sewage treatment time.
8. The control method according to claim 6, characterized in that: the calculation of the sewage treatment time specifically comprises the following steps:
s21, sampling the sewage to be treated to obtain a sampling point Q of the sewage environment data0(x0，y0，z0) Selecting a known point Q of the environmental data in the sewage treatment environment-time databasei(xi，yi，zi) Known point QiCorresponding to a sewage treatment time of tiWherein x is0For the pH value, y, of the sampled sewage to be treated0For the temperature of the sampled sewage to be treated, z0The oxygen content of the sampled sewage to be treated; x is the number ofiIs the pH value, y, of the wastewater in the databaseiIs the temperature of the wastewater in the database, ziTaking the value of i as a positive integer, wherein the value is the oxygen content of the sewage in the database;
s22, calculating a sampling point Q0And a known point QiA distance r ofiIs composed of
Figure FDA0003651559170000031
S23, dividing the distance riThe distances r are sorted from small to largeiMinimum seven known points Q1(x1，y1，z1)、Q2(x2，y2，z2)、Q3(x3，y3，z3)、Q4(x4，y4，z4)、Q5(x5，y5，z5)、Q6(x6，y6，z6) And Q7(x7，y7，z7) Determining as a reference point;
s24, calculating a sampling point Q according to the seven reference points, the sampling points and a preset reconstruction function0Corresponding sewage treatment time t0。
9. The control method according to claim 8, characterized in that: the step S24 specifically includes:
s241, calculating the coefficient of the reconstruction function according to the seven reference points and a preset reconstruction function to obtain a reconstruction function expression, wherein the preset reconstruction function t of the sewage treatment environment-time database is as follows:
t＝a0+a1x+a2y+a3z+a4xy+a5yz+z6xz+a7xyz；
wherein a is0-a7The function coefficient is shown, x is the PH value of the sewage treatment environment, y is the temperature, z is the oxygen content, and t is the sewage treatment time when the water quality reaches the standard;
s242, calculating the sewage treatment time t corresponding to the sampling point according to the sampling point and the reconstruction function expression0。
10. The control method according to claim 9, characterized in that: the adjusting the sampling environment data according to the predetermined interval specifically comprises:
s41, adjusting the pH value of the sewage to be treated according to the first preset interval, and obtaining a minimum pH value adjustment value which is not more than the preset time and corresponds to the sewage treatment time after the pH value is adjusted; calculating the lowest pH value adjusting cost according to the unit cost of pH value adjustment and the minimum pH value adjusting value;
s42, adjusting the temperature of the sewage to be treated according to a second preset interval to obtain a minimum temperature adjustment value corresponding to the preset time, wherein the sewage treatment time after the temperature is adjusted is not more than the preset time; calculating the minimum temperature adjustment cost according to the unit cost of temperature adjustment and the minimum temperature adjustment value;
s43, adjusting the oxygen content of the sewage to be treated according to a third preset interval, and obtaining that the sewage treatment time after the oxygen content is adjusted is not more than the minimum oxygen content adjusting value corresponding to the preset time; calculating the lowest oxygen content adjusting cost according to the unit cost of the oxygen content adjustment and the minimum oxygen content adjusting value;
and S44, obtaining an adjusting scheme with the lowest adjusting cost according to the lowest PH value adjusting cost, the lowest temperature adjusting cost and the lowest oxygen content adjusting cost.
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