Method, device and equipment for evaluating PAM efficacy of sludge dewatering system

Abstract

The embodiment of the invention provides a PAM drug effect evaluation method, device and equipment for a sludge dewatering system, and the method comprises the following steps: when a PAM solution with a specified concentration is injected into sludge collected by a thickener, recording the injection amount of the PAM solution; the sludge feeding amount and the sludge feeding concentration of the thickener are obtained, and sludge feeding solid content parameters are obtained through calculation; when the sludge enters a dehydration stage after being concentrated, recording relevant parameters of sludge feeding and sludge discharging so as to determine the water content of the discharged sludge; determining the weight of each evaluation index, wherein the evaluation indexes are used for evaluating the drug effect of the PAM solution; calculating a comprehensive score of the PAM solution at least based on the injection amount of the PAM solution, the inlet sludge solid content parameter, the inlet sludge and outlet sludge related parameters, the outlet sludge water content, each evaluation index and the corresponding weight; and determining the drug effect of the PAM solution based on the comprehensive score.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to sewage treatment and sludge resource utilization technical field, in particular to a sludge dewatering system PAM drug efficacy evaluation method, device and equipment. BACKGROUND

[0002] In the sewage treatment process, sludge dewatering is one of the key links. As a commonly used organic polymer flocculant, cationic polyacrylamide (PAM) plays an important role in improving sludge dewatering performance and reducing sludge moisture content. At present, two indicators of sludge moisture content and solid recovery rate are usually used to measure the dewatering effect. However, it is found in the production process of the operation project that different PAMs will have a certain impact on the treatment capacity of the rear sludge dewatering system, thereby affecting the sludge concentration control of the sewage treatment plant. Therefore, only using the sludge moisture content and the solid recovery rate cannot comprehensively, systematically and multi-faceted reflect the influence of PAM on the whole process of sludge treatment and disposal.

[0003] Therefore, it is urgent to develop a PAM drug efficacy evaluation method with strong systematicness, high operability and high quantification degree to realize the objective evaluation of the drug efficacy of PAM. SUMMARY

[0004] In order to solve the above technical problems, the embodiment of the present application provides a sludge dewatering system PAM drug efficacy evaluation method, comprising: When the PAM solution with a specified concentration is injected into the sludge in the thickener, the injection amount of the PAM solution is recorded; The sludge amount and sludge concentration of the thickener are obtained, and the sludge solid content rate parameter is calculated; When the sludge is concentrated and enters the dewatering stage, the sludge and sludge related parameters are recorded, and the sludge moisture content is determined; The weight of each evaluation index is determined, and the evaluation index is used to evaluate the drug efficacy of the PAM solution; At least based on the injection amount of the PAM solution, and the sludge solid content rate parameter, sludge and sludge related parameters, sludge moisture content, each evaluation index and corresponding weight, the comprehensive score of the PAM solution is calculated; The drug efficacy of the PAM solution is determined based on the comprehensive score.

[0005] In an embodiment, the weight of each evaluation index is determined, comprising: The importance score of each evaluation index is obtained by each expert; The weight of each evaluation index is determined based on the importance score.

[0006] In an embodiment, the weight of each evaluation index is determined based on the importance score, comprising: The importance scores are standardized to unify the dimension of scores; The importance scores are adjusted according to the weights of each expert and the decision consensus degree between each expert to obtain a target importance score for each evaluation index, and the target importance score meets a decision consensus degree threshold; The weight of each evaluation index is determined based on the target importance score.

[0007] In an embodiment, the obtaining of the sludge feeding amount and sludge feeding concentration of the thickener and the calculation of the solid content rate parameter include: The PAM solution and sludge are stirred and mixed by a mixer and then enter the thickener, and the sludge feeding amount, sludge feeding concentration, sludge discharging state and filtrate state parameters of the thickener are recorded; The sludge feeding solid content rate, sludge discharging solid content rate and filtrate solid content rate are calculated by using the sludge feeding amount, sludge feeding concentration, sludge discharging state and filtrate state parameters.

[0008] In an embodiment, when the sludge enters the dewatering stage after being thickened, the sludge feeding and discharging related parameters are recorded to determine the sludge discharging water content rate, in the case that the dewatering process is performed by using a high-pressure plate frame, including: In response to the sludge entering the high-pressure plate frame after being thickened by the thickener, the main machine speed, the secondary machine speed, the plate frame sludge feeding amount, the iron salt and lime dosages, and the pressing time of the high-pressure plate frame are maintained at corresponding preset states; The plate frame sludge feeding amount, plate frame sludge feeding time, plate frame sludge discharging amount and plate frame sludge discharging time are collected, and the plate frame sludge discharging water content rate is determined based on the plate frame sludge feeding amount, plate frame sludge feeding time, plate frame sludge discharging amount and plate frame sludge discharging time.

[0009] In an embodiment, the evaluation indexes include PAM reagent cost per ton of absolute dry sludge, plate frame sludge feeding amount, plate frame sludge discharging water content rate, transportation cost per ton of absolute dry sludge, and disposal cost per ton of absolute dry sludge; When calculating the comprehensive score, the calculation is performed based on the following formula: Comprehensive score = PAM reagent cost per ton of absolute dry sludge + plate frame sludge feeding amount + plate frame sludge discharging water content rate + transportation cost per ton of absolute dry sludge + disposal cost per ton of absolute dry sludge × S 每吨绝干污泥PAM药剂费 + × S 板框进泥量 + × S 板框出泥含水率 + × S 每吨绝干污泥运输费 + × S 每吨绝干污泥处置费； The is an index weight, i is 1, 2, 3, 4 or 5, and the For each evaluation index, the x is the PAM agent cost per ton of absolute dry sludge, the plate frame into sludge volume, the plate frame out sludge moisture content, the transportation cost per ton of absolute dry sludge, and the disposal cost per ton of absolute dry sludge, and the normalized score is the normalized score of the score of each expert for the current sludge treatment scene in combination with the evaluation index.

[0010] In an embodiment, the at least based on the injection amount of the PAM solution, and the solid content parameter of the sludge, the sludge and mud related parameters, the sludge moisture content, each evaluation index and the corresponding weight calculation of the comprehensive score of the PAM solution, comprising: Based on the sludge solid recovery rate calculated from the sludge solid content rate in the solid content parameter, the filtrate solid content rate, and the sludge solid content rate into the thickener; Based on the injection amount of the PAM solution, the sludge solid recovery rate, and the sludge volume and sludge concentration in the sludge and sludge related parameters, the PAM agent cost per ton of absolute dry sludge is calculated; Combined with the sludge moisture content, the transportation cost per ton of absolute dry sludge and the disposal cost per ton of absolute dry sludge are determined; Obtain the normalized score of each evaluation index of the expert for the current sludge treatment scene; Combined with the normalized score and the weight of each evaluation index, the comprehensive score is calculated.

[0011] In an embodiment, the combination of the sludge moisture content to determine the transportation cost per ton of absolute dry sludge and the disposal cost per ton of absolute dry sludge, comprising: Obtain the sludge transportation cost per ton of wet sludge; Based on the sludge transportation cost per ton of wet sludge and the plate frame out sludge moisture content, the transportation cost per ton of absolute dry sludge is calculated; Obtain the sludge disposal cost per ton of wet sludge; Based on the sludge disposal cost per ton of wet sludge and the plate frame out sludge moisture content, the disposal cost per ton of absolute dry sludge is calculated.

[0012] Another embodiment of the present application simultaneously provides a sludge dewatering system PAM efficacy evaluation device, comprising: The first recording module is used for recording the injection amount of the PAM solution when the PAM solution with a specified concentration is injected into the sludge in the thickener; The first obtaining module is used for obtaining the sludge volume and sludge concentration of the thickener, and calculating the sludge solid content parameter; The second recording module is used for recording the sludge and sludge related parameters when the sludge is concentrated and enters the dewatering stage, to determine the sludge moisture content; The first determining module is used to determine the weight of each evaluation index, which is used to evaluate the efficacy of the PAM solution. The first calculation module is used to calculate the comprehensive score of the PAM solution based at least on the injection volume of the PAM solution, the solid content parameter of the sludge entering the sludge, the relevant parameters of the sludge entering and leaving the sludge, the moisture content of the sludge leaving the sludge, each evaluation index and its corresponding weight. The second determining module is used to determine the efficacy of the PAM solution based on the comprehensive score.

[0013] Another embodiment of the present invention also provides an electronic device, comprising: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to implement the PAM efficacy evaluation method for sludge dewatering systems as described above.

[0014] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0015] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic flowchart of the PAM efficacy evaluation method for the sludge dewatering system in an embodiment of the present invention.

[0018] Figure 2 This is a schematic flowchart of the PAM efficacy evaluation method for a sludge dewatering system according to another embodiment of the present invention.

[0019] Figure 3 This is a schematic flowchart of the PAM efficacy evaluation method for a sludge dewatering system in another embodiment of the present invention.

[0020] Figure 4This is a structural block diagram of the PAM efficacy evaluation device for the sludge dewatering system in an embodiment of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but these are not intended to limit the scope of the invention.

[0022] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the following description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope of this disclosure will be apparent to those skilled in the art.

[0023] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0024] These and other features of the invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0025] It should also be understood that although the invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0026] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0027] Specific embodiments of the present disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure and can be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure the present disclosure. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of substantially any suitable detailed structures.

[0028] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0029] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 As shown, this embodiment of the invention provides a method for evaluating the efficacy of PAM in a sludge dewatering system, comprising: S1: When injecting a PAM solution of a specified concentration into the sludge collected by the thickener, record the amount of PAM solution injected; S2: Obtain the sludge feed rate and sludge concentration of the thickener, and calculate the solids content parameter; S3: When the sludge enters the dewatering stage after thickening, record the relevant parameters of sludge inlet and outlet, and determine the moisture content of the outlet sludge; S4: Determine the weight of each evaluation index, which is used to evaluate the efficacy of the PAM solution; S5: Calculate the comprehensive score of the PAM solution based at least on the injection volume of the PAM solution, the solid content parameter of the sludge entering the mud, the relevant parameters of the sludge entering and leaving the mud, the moisture content of the sludge leaving the mud, each evaluation index and its corresponding weight; S6: Determine the efficacy of the PAM solution based on the comprehensive score.

[0031] Based on the above, this embodiment records relevant parameters of the sludge to be treated at different stages in a real-world scenario, as well as the amount of PAM solution used. The recorded parameters are then processed using a pre-constructed comprehensive scoring model to obtain a comprehensive score for the efficacy of the PAM solution in the corresponding real-world scenario. This achieves a quantitative assessment of the PAM agent's effectiveness, providing a scientific basis for the selection and evaluation of agents in wastewater treatment projects. The comprehensive scoring model in this embodiment is formed by pre-constructing multiple different evaluation indicators and corresponding weights for each indicator. These weights and evaluation indicators are determined comprehensively based on the opinions of multiple experts, ensuring strong reference value and high operability.

[0032] In wastewater treatment projects, the process involves centrifugal thickening and dewatering filtration. Centrifugal thickening is performed using a thickener, and dewatering filtration can be, but is not limited to, using a high-pressure plate and frame filter press. During wastewater treatment, a PAM solution with a concentration of 0.5‰-2‰ can be used, but is not limited to, a solution that can be prepared. The thickener feeds sludge according to the designed feed rate. Workers add a PAM solution of a specified concentration to the sludge within a set dosage range. The algorithm then automatically records the amount of PAM solution injected, i.e., the actual injection volume. This injection volume can be provided by a preset flow meter, manually input, or through other methods; the specific method is not unique.

[0033] Furthermore, such as Figure 2 As shown, obtaining the feed sludge rate and concentration of the thickener, and calculating the feed sludge solids content parameters, includes: S201: The PAM solution and sludge are stirred and mixed by a mixer and then fed into a thickener. The parameters of the thickener, including the sludge feed rate, sludge concentration, sludge discharge status, and filtrate status, are recorded. S202: Calculate the solid content of the sludge, the solid content of the sludge, and the solid content of the filtrate using the parameters of sludge feed rate, sludge concentration, sludge discharge state, and filtrate state.

[0034] For example, when the PAM solution is injected into the sludge in the thickener, the algorithm activates mixing equipment such as agitators to ensure that the PAM solution is evenly mixed into the sludge, guaranteeing thorough mixing between the PAM solution and the sludge particles. During this process, the algorithm simultaneously records parameters such as the thickener's feed rate, feed concentration, sludge discharge status, and filtrate status, including sludge solids content and filtrate solids content. This recorded data is used to determine the feed solids content, sludge discharge solids content, and filtrate solids content.

[0035] The dehydration stage may involve various processes, including high-pressure plate and frame dehydration, belt dehydration, or other dehydration methods.

[0036] In one embodiment, when the dewatering process uses a high-pressure plate and frame dewatering method, after the sludge has been concentrated by a thickener, during the dewatering stage after sludge concentration, relevant parameters of the sludge inlet and outlet are recorded to determine the sludge moisture content, including: S301: In response to the sludge entering the high-pressure plate and frame after being concentrated by the thickener, the main machine speed, auxiliary machine speed, sludge feed rate, iron salt and lime dosage, and pressing time of the high-pressure plate and frame are controlled to be maintained at the corresponding preset state. S302: Collect the mud inlet amount, mud inlet time, mud outlet amount, and mud outlet time of the plate and frame, and determine the mud outlet moisture content based on the mud inlet amount, mud inlet time, and mud outlet time of the plate and frame.

[0037] For example, after being thickened by a thickener, the sludge is conveyed to a high-pressure plate and frame filter press. In response to the sludge entering the press, the algorithm controls the main unit speed, auxiliary unit speed, sludge feed rate, iron salt and lime dosage for sludge pressing, and pressing time of the press, all within their respective preset states and maintained constant. Simultaneously, the sludge feed rate, feed time, and discharge time are recorded to determine the moisture content of the discharged sludge based on these recorded parameters.

[0038] After the parameters are collected, the expert scoring stage can be entered to determine the score of each current sludge / wastewater treatment scenario relative to each evaluation indicator. Then, a comprehensive score is calculated based on each score and the pre-constructed weights.

[0039] Specifically, such as Figure 3 As shown, in this embodiment, the weight of each evaluation indicator is determined, including: S401: Obtain the importance scores from each expert for each of the aforementioned evaluation indicators; S402: Determine the weight of each of the evaluation indicators based on the importance score.

[0040] In this embodiment, multiple evaluation indicators are different, so different experts may have different opinions on the importance of each indicator in judging the efficacy of PMA. Moreover, the importance of each evaluation indicator will vary depending on the actual scenario and objective needs. Since there is a positive conversion relationship between importance and weight, this embodiment determines the weight of each evaluation indicator by obtaining the importance score of each expert for each evaluation indicator, and then determining the weight of each evaluation indicator based on the importance score. Alternatively, the weight of each evaluation indicator can be determined by comprehensively considering the importance score and the actual objective needs.

[0041] For example, a combined weighting method can be adopted based on different sludge treatment processes and sludge disposal methods, while also allocating the weights of each evaluation indicator in combination with subjective and objective needs.

[0042] Alternatively, as in this embodiment, determining the weight of each evaluation indicator based on the importance score may include: S403: Standardize each of the aforementioned importance scores to unify the score dimensions; S404: Adjust the importance score according to the weight of each expert and the degree of consensus among the experts to obtain the target importance score for each evaluation indicator, wherein the target importance score meets the degree of consensus threshold. S405: Determine the weight of each of the evaluation indicators based on the target importance score.

[0043] In this embodiment, the first step is to unify the dimensions of the scoring. For example, through standardization, scoring indicators of different properties and dimensions can be converted into dimensionless values ​​between 0 and 1, facilitating comprehensive scoring. Of course, other dimensions can also be used, not limited to dimensionless values ​​between 0 and 1. After unifying the dimensions of the scores, the algorithm determines the weight of each expert. This weight can be based on the expert's authority, the relevance of their technical expertise to the wastewater treatment field, or other information, such as the contribution of each expert to historical assessment events. Next, the algorithm determines the consensus among multiple experts on each evaluation indicator. Then, based on the expert weights and consensus, a comprehensive analysis is performed, and the importance scores are adjusted based on the analysis results. The adjusted importance scores are then normalized or averaged to obtain the target importance score for each evaluation indicator. Each target importance score is a synthesis of the importance scores given by multiple experts for that evaluation indicator. Furthermore, each target importance score meets the decision consensus threshold, meaning that the target importance score is similar to multiple importance scores and conforms to the views of multiple experts on importance, thus ensuring the reliability of the target importance score.

[0044] In another embodiment, the evaluation indicators include, but are not limited to, the cost of PAM reagent per ton of oven-dry sludge, the amount of sludge fed into the plate and frame sludge tray, the moisture content of the sludge discharged from the plate and frame sludge tray, the transportation cost per ton of oven-dry sludge, and the disposal cost per ton of oven-dry sludge. In this embodiment, the comprehensive score is calculated based on the following formula: Overall score = ×S 每吨绝干污泥PAM药剂费 + ×S 板框进泥量 + ×S 板框出泥含水率 + ×S 每吨绝干污泥运输费 + ×S 每吨绝干污泥处置费； The For the indicator weights, i takes values ​​of 1, 2, 3, 4, and 5. The normalized score for each evaluation indicator is calculated as follows: x is the cost of PAM reagent per ton of oven-dried sludge, the amount of sludge fed into the plate and frame sludge treatment system, the moisture content of the sludge discharged from the plate and frame sludge treatment system, the transportation cost per ton of oven-dried sludge, and the disposal cost per ton of oven-dried sludge. The normalized score is the score obtained by normalizing the range standardization of the scores given by each expert for the current sludge treatment scenario in combination with the evaluation indicators.

[0045] Specifically, the comprehensive score of the PAM solution is calculated based at least on the injection volume of the PAM solution, as well as the solids content parameters of the sludge, influent and effluent sludge-related parameters, effluent sludge moisture content, various evaluation indicators, and their corresponding weights. This includes: S501: Calculate the sludge solids recovery rate based on the solids content of the discharged sludge, the solids content of the filtrate, and the solids content of the sludge entering the thickener in the solids content parameters. S502: The cost of PAM reagent per ton of oven-dry sludge is calculated based on the injection volume of the PAM solution, the sludge solid recovery rate, and the sludge inlet volume and sludge inlet concentration among the sludge inlet and outlet parameters. S503: Determine the transportation cost and disposal cost per ton of absolutely dry sludge based on the sludge moisture content. S504: Obtain the normalized scores of the experts for the current sludge treatment scenario on each of the evaluation indicators; S505: The comprehensive score is calculated by combining the normalized score and the weights of each evaluation indicator.

[0046] For example, in this embodiment, the cost of PAM reagent per ton of oven-dried sludge is calculated using the following formula: PAM reagent cost per ton of oven-dried sludge = PAM dosage × PAM reagent unit price / (sludge input volume × sludge concentration × sludge solids recovery rate / 1000) Among them: the cost of PAM reagent per ton of oven-dry sludge, RMB / ton oven-dry; PAM dosage, m 3 ; PAM reagent unit price, yuan / ton; Sludge intake, m 3 ; Sludge concentration, kg / m³ 3 ; Sludge solids recovery rate, dimensionless, is calculated using the following formula: η = Cμ(C0-Ce) / (C0(Cμ-Ce)) η : Sludge solids recovery rate Cμ Solid content (%) of mud cake, which is the ratio of the mass of dry solids in mud cake to the total mass of mud cake.

[0047] Ce Solid content of filtrate (%), which is the ratio of the mass of dry solids in the filtrate to the total mass of the filtrate.

[0048] C0 Solid content (%) of the sludge fed into the thickener is the ratio of the mass of dry solids in the sludge to the total mass of the sludge entering the dewatering machine.

[0049] After calculating the cost of PAM reagent per ton of oven-dried sludge, the parameters related to each evaluation indicator can be input for expert scoring. Then, the range standardization method is used to normalize the scores for each evaluation indicator, yielding a final score for each indicator. Based on these scores, a comprehensive score can be calculated using the above formula.

[0050] Furthermore, the determination of the transportation cost per ton of absolutely dry sludge and the disposal cost per ton of absolutely dry sludge based on the sludge moisture content includes: S506: Obtain transportation fees per ton of wet sludge; S507: The transportation cost per ton of absolutely dry sludge is calculated based on the transportation cost per ton of wet sludge and the moisture content of the sludge discharged from the plate and frame. S508: Obtain a sludge disposal fee per ton of wet sludge; S509: The disposal cost per ton of absolutely dry sludge is calculated based on the sludge disposal cost per ton of wet sludge and the moisture content of the sludge discharged from the plate and frame.

[0051] For example, the transportation cost per ton of oven-dried sludge = the transportation cost per ton of wet sludge / (1 - moisture content of sludge discharged from the plate and frame); where the transportation cost per ton of oven-dried sludge is RMB / ton of oven-dried sludge; the transportation cost per ton of wet sludge is RMB / ton of wet sludge; and the moisture content of the plate and frame is dimensionless.

[0052] Disposal cost per ton of absolutely dry sludge = Disposal cost per ton of wet sludge / (1 - Moisture content of sludge discharged from plate and frame sludge); The disposal fee is RMB per ton of completely dry sludge; the disposal fee is RMB per ton of wet sludge; and the moisture content of the plate and frame is dimensionless.

[0053] In another embodiment, if the concentration and dehydration process is an integrated process of gravity concentration and belt concentration and dehydration, i.e., a belt concentration and dehydration integrated machine for dehydration, then the process includes the following steps: Prepare a PAM solution with a concentration of 0.5‰-2‰. Feed sludge into the belt conveyor thickener / dewatering machine according to the designed feed rate. Add the PAM solution of the set concentration to the sludge at the set dosage. Use a stirrer to mix evenly for a certain period of time to ensure that the PAM solution is mixed with the sludge particles. The sludge sequentially passes through the thickening section and dewatering section of the belt conveyor thickener / dewatering machine. During this process, record the sludge feed rate and PAM dosage in the thickening section. Simultaneously, collect samples of the sludge feed from the thickening section, the sludge cake from the dewatering section, and the filtrate from the dewatering section. Measure the solids content of the feed sludge (at the same feed concentration), the solids content of the sludge, and the solids content of the filtrate. Take a sample of the sludge cake from the belt dewatering machine and measure its moisture content.

[0054] The weights of each indicator are determined using an expert scoring method. Through standardization, scoring indicators of different natures and dimensions can be transformed into dimensionless values ​​between 0 and 1, thus facilitating comprehensive scoring. The specific scoring model is as follows: Overall score = ×S tons of oven-dried sludge PAM reagent cost + ×S tons of absolutely dry sludge transportation cost+ ×S tons of absolutely dry sludge disposal cost; in, To assign weights to each indicator, a combined weighting method is adopted, combining subjective and objective needs to allocate weights. The normalized score is normalized using the range standardization method.

[0055] PAM reagent cost per ton of oven-dried sludge = PAM dosage × PAM reagent unit price / (sludge feed volume × sludge concentration × sludge solids recovery rate / 1000); The sludge solids recovery rate is dimensionless. The calculation formula is:

[0056] η : Sludge solids recovery rate; Cμ Solid content (%) of the sludge cake produced by the dewatering section of the belt thickener is the ratio of the mass of dry solids in the sludge cake produced by the dewatering section of the belt thickener to the total mass of the sludge cake. Ce Solid content of filtrate (%), which is the ratio of the mass of dry solids in filtrate to the total mass of filtrate; C0 Solid content (%) of the sludge entering the thickening section of the belt thickener / dewatering machine, which is the ratio of the mass of dry solids in the sludge entering the thickening section of the integrated belt thickener / dewatering machine to the total mass of the sludge.

[0057] Transportation cost per ton of dry sludge = Transportation cost per ton of wet sludge / (1 - Moisture content of sludge discharged from belt thickener and dewatering machine); Disposal fee per ton of dry sludge = Disposal fee per ton of wet sludge / (1 - Moisture content of sludge discharged from belt thickener and dewatering machine).

[0058] To better illustrate the solution in this embodiment, the following description uses different application examples: Example 1: Taking a municipal wastewater treatment plant (Y) as an example, sludge concentration control is a key process control focus that the plant continuously monitors. The sludge treatment and disposal process employs "centrifugal thickening + high-pressure plate and frame dewatering," with the effluent sludge moisture content required to be no higher than 60%. Three types of PAM agents (A, B, and C) are to be selected. Experiments revealed that different specifications of PAM agents affect the sludge feed rate to the high-pressure plate and frame dewatering system. Therefore, the sludge feed rate is assigned a weight of 30%. The weighting percentages for other factors, including PAM agent cost per ton of oven-dry sludge, effluent sludge moisture content from the plate and frame dewatering system, transportation cost per ton of oven-dry sludge, and disposal cost per ton of oven-dry sludge, are detailed in the table below.

[0059]

[0060] Among them, the sludge inlet volume of the plate and frame sludge treatment plant is a positive indicator, that is, the larger the better, and it is standardized using the formula Zi=(Xi-Xmin) / (Xmax-Xmin). The cost of PAM reagent per ton of oven-dry sludge, the moisture content of sludge discharged from the plate and frame sludge treatment plant, the transportation cost per ton of oven-dry sludge, and the disposal cost per ton of oven-dry sludge are all negative indicators, that is, the smaller the better, and they are standardized using the formula Zi=(Xmax-Xi) / (Xmax-Xmin). The standardized values ​​of each indicator are shown in the table below. According to the comprehensive scoring formula mentioned above, the comprehensive scores of the three reagents A, B, and C are calculated to be 0.77, 0.10, and 0.92, respectively. Therefore, the recommended reagent selection is C>A>B.

[0061]

[0062] Example 2 Taking a municipal wastewater treatment plant (case L) as an example, the sludge treatment and disposal adopts a "belt thickener and dewatering integrated machine," and the required sludge moisture content is no higher than 80%. Three PAM agents (D, E, and F) are to be selected. Since the sludge is directly transported off-site for disposal after belt thickening and dewatering, the comprehensive scoring model only assigns weights to the cost of PAM agents per ton of absolutely dry sludge and the cost of treatment and disposal per ton of absolutely dry sludge, as detailed in the table below.

[0063]

[0064] The standardized values ​​of each indicator are shown in the table below. According to the comprehensive scoring formula, the comprehensive scores of the three drugs D, E, and F are 0.08, 0.90, and 0.30, respectively. Therefore, the recommended drug selection is E>F>D.

[0065]

[0066] like Figure 4 As shown, another embodiment of the present invention also provides a PAM efficacy evaluation device for a sludge dewatering system, comprising: The first recording module is used to record the injection volume of PAM solution when injecting a PAM solution of a specified concentration into the sludge collected by the thickener. The first obtaining module is used to obtain the sludge feed rate and sludge concentration of the thickener, and to calculate the solids content parameter of the sludge feed. The second recording module is used to record relevant parameters of sludge inlet and outlet and determine the moisture content of sludge outlet when the sludge enters the dewatering stage after thickening. The first determining module is used to determine the weight of each evaluation index, which is used to evaluate the efficacy of the PAM solution. The first calculation module is used to calculate the comprehensive score of the PAM solution based at least on the injection volume of the PAM solution, the solid content parameter of the sludge entering the sludge, the relevant parameters of the sludge entering and leaving the sludge, the moisture content of the sludge leaving the sludge, each evaluation index and its corresponding weight. The second determining module is used to determine the efficacy of the PAM solution based on the comprehensive score.

[0067] In one embodiment, determining the weight of each evaluation indicator includes: Obtain the importance scores from each expert for each of the aforementioned evaluation indicators; The weight of each evaluation indicator is determined based on the importance score.

[0068] In one embodiment, determining the weight of each evaluation indicator based on the importance score includes: The importance scores are standardized to unify the score dimensions; The importance scores are adjusted based on the weights of each expert and the degree of consensus among the experts to obtain a target importance score for each evaluation indicator, wherein the target importance score satisfies the degree of consensus threshold. The weight of each evaluation indicator is determined based on the target importance score.

[0069] In one embodiment, obtaining the feed sludge rate and concentration of the thickener, and calculating the feed sludge solids content parameter, includes: The PAM solution and sludge are stirred and mixed by a mixer and then fed into a thickener. The parameters of the thickener, including the sludge feed rate, sludge concentration, sludge discharge status, and filtrate status, are recorded. The solid content of the influent, the solid content of the effluent, and the solid content of the filtrate are calculated using the parameters of sludge inflow rate, sludge concentration, sludge discharge state, and filtrate state.

[0070] In one embodiment, when the dewatering process uses a high-pressure plate and frame dewatering method, the step of recording relevant parameters of the sludge inlet and outlet during the dewatering stage after sludge thickening to determine the sludge moisture content includes: In response to the sludge being compressed by the thickener and then entering the high-pressure plate and frame, the main machine speed, auxiliary machine speed, sludge feed rate, iron salt and lime dosage, and pressing time of the high-pressure plate and frame are controlled to be maintained at the corresponding preset states. Collect the mud inlet volume, mud inlet time, and mud outlet time of the plate and frame, and calculate the mud outlet moisture content based on the mud inlet volume, mud inlet time, and mud outlet time of the plate and frame.

[0071] In one embodiment, the evaluation indicators include the cost of PAM reagent per ton of oven-dried sludge, the amount of sludge fed into the plate and frame sludge tray, the moisture content of the sludge discharged from the plate and frame sludge tray, the transportation cost per ton of oven-dried sludge, and the disposal cost per ton of oven-dried sludge. The comprehensive score is calculated based on the following formula: Overall score = ×S 每吨绝干污泥PAM药剂费 + ×S 板框进泥量 + ×S 板框出泥含水率 + ×S 每吨绝干污泥运输费 + ×S 每吨绝干污泥处置费； The For the indicator weights, i takes values ​​of 1, 2, 3, 4, and 5. The normalized score for each evaluation indicator is calculated as follows: x is the cost of PAM reagent per ton of oven-dried sludge, the amount of sludge fed into the plate and frame sludge treatment system, the moisture content of the sludge discharged from the plate and frame sludge treatment system, the transportation cost per ton of oven-dried sludge, and the disposal cost per ton of oven-dried sludge. The normalized score is the score obtained by normalizing the range standardization of the scores given by each expert for the current sludge treatment scenario in combination with the evaluation indicators.

[0072] In one embodiment, the calculation of the comprehensive score of the PAM solution based at least on the injection volume of the PAM solution, and the solids content parameters of the sludge, influent and effluent sludge-related parameters, effluent sludge moisture content, various evaluation indicators, and corresponding weights, includes: The sludge solids recovery rate is calculated based on the solids content of the discharged sludge, the solids content of the filtrate, and the solids content of the sludge entering the thickener. The cost of PAM reagent per ton of oven-dry sludge is calculated based on the injection volume of the PAM solution, the sludge solids recovery rate, and the sludge inlet volume and sludge inlet concentration among the relevant parameters for sludge inlet and outlet. The transportation cost and disposal cost per ton of absolutely dry sludge are determined based on the sludge moisture content. Obtain the normalized scores of the experts for each of the aforementioned evaluation indicators regarding the current sludge treatment scenario; The comprehensive score is calculated by combining the normalized score and the weights of each evaluation indicator.

[0073] In one embodiment, determining the transportation cost per ton of oven-dry sludge and the disposal cost per ton of oven-dry sludge based on the sludge moisture content includes: Receive transportation fees per ton of wet sludge / sludge; The transportation cost per ton of absolutely dry sludge is calculated based on the transportation cost per ton of wet sludge and the moisture content of the sludge discharged from the plate and frame. Receive a sludge disposal fee per ton of wet sludge; The cost of disposing of each ton of absolutely dry sludge is calculated based on the sludge disposal cost per ton of wet sludge and the moisture content of the sludge discharged from the plate and frame.

[0074] Another embodiment of the present invention also provides an electronic device, comprising: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to implement the PAM efficacy evaluation method for sludge dewatering systems as described above.

[0075] Furthermore, one embodiment of the present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the PAM efficacy evaluation method for the sludge dewatering system as described above. It should be understood that the various solutions in this embodiment have the corresponding technical effects in the above-described method embodiments, and will not be repeated here.

[0076] Furthermore, embodiments of the present invention also provide a computer program product, which is tangibly stored on a computer-readable medium and includes computer-readable instructions that, when executed, cause at least one processor to perform a PAM efficacy evaluation method for a sludge dewatering system, such as the one described in the embodiments above.

[0077] It should be noted that the computer storage medium of the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access storage medium (RAM), a read-only storage medium (ROM), an erasable programmable read-only storage medium (EPROM or flash memory), an optical fiber, a portable compact disk read-only storage medium (CD-ROM), an optical storage medium, a magnetic storage medium, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. In the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program configured for use by or in connection with an instruction execution system, system, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, antenna, optical fiber, RF, etc., or any suitable combination thereof.

[0078] Furthermore, those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0079] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1One or more processes and / or boxes Figure 1 A system that specifies functions in one or more boxes.

[0080] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction set implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0081] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

Claims

1. A method for evaluating the effectiveness of PAM in a sludge dewatering system, characterized by, The method comprises the following steps: recording the injection amount of the PAM solution when the PAM solution with a specified concentration is injected into the sludge in the thickener; obtaining the sludge amount and sludge concentration of the thickener, and calculating the sludge solid content parameter; recording the sludge and dewatered sludge related parameters when the sludge is dewatered after being thickened, and determining the dewatered sludge moisture content; determining the weight of each evaluation index used for evaluating the drug efficacy of the PAM solution; calculating the comprehensive score of the PAM solution based on at least the injection amount of the PAM solution, the sludge solid content parameter, the sludge and dewatered sludge related parameters, the dewatered sludge moisture content, each evaluation index and the corresponding weight; determining the drug efficacy of the PAM solution based on the comprehensive score.

2. The method of claim 1, wherein the PAM is a polyacrylamide. The method comprises the following steps: obtaining the importance score of each evaluation index by each expert; determining the weight of each evaluation index based on the importance score.

3. The method of claim 2, wherein the PAM is added to the sludge at a concentration of 0.1 to 10 mg / L. The method comprises the following steps: standardizing each importance score to unify the dimension of the score; adjusting the importance score according to the weight of each expert and the decision consensus degree between the experts to obtain a target importance score of each evaluation index, the target importance score satisfying a decision consensus degree threshold; determining the weight of each evaluation index based on the target importance score.

4. The method of claim 1, wherein the PAM is a polyacrylamide. The method comprises the following steps: calling a mixer to mix the PAM solution and the sludge and then sending the mixture into the thickener, and recording the sludge amount, sludge concentration, dewatered sludge state and filtrate state parameters of the thickener; calculating the sludge solid content, dewatered sludge solid content and filtrate solid content based on the sludge amount, sludge concentration, dewatered sludge state and filtrate state parameters.

5. The method of claim 1, wherein the PAM is a polyacrylamide. In the case that the dewatering process is to use a high-pressure plate frame for dewatering, the method comprises the following steps: in response to the sludge being thickened by the thickener and then entering the high-pressure plate frame, maintaining the main machine speed, secondary machine speed, plate frame sludge amount, iron salt and lime amount, and pressing time of the high-pressure plate frame at corresponding preset states; collecting the plate frame sludge amount, plate frame sludge time, plate frame dewatered sludge time, and determining the plate frame dewatered sludge moisture content based on the plate frame sludge amount, plate frame sludge time, plate frame dewatered sludge amount and plate frame dewatered sludge time.

6. The method of claim 5, wherein the PAM is added to the sludge at a concentration of 0.1 to 10 mg / L. The evaluation indexes include the PAM agent cost per ton of absolute dry sludge, plate frame sludge amount, plate frame dewatered sludge moisture content, transportation cost per ton of absolute dry sludge, and disposal cost per ton of absolute dry sludge; The comprehensive score is calculated based on the following formula: Composite score = x S 每吨绝干污泥PAM药剂费 + x S 板框进泥量 + x S 板框出泥含水率 + x S 每吨绝干污泥运输费 + x S 每吨绝干污泥处置费； The is an index weight, i is 1, 2, 3, 4, 5, and is a normalized score of each evaluation index, x is PAM agent cost per ton of absolute dry sludge, plate frame into sludge volume, plate frame out sludge moisture content, transportation cost per ton of absolute dry sludge, and disposal cost per ton of absolute dry sludge, and the normalized score is a normalized value of the score of each evaluation index by the expert in combination with the evaluation index for the current sludge treatment scene using range standardization.

7. The method of claim 6, wherein the PAM is added to the sludge at a concentration of 0.1 to 10 mg / L. The method comprises the following steps: calculating the sludge solid recovery rate based on the dewatered sludge solid content, filtrate solid content and sludge solid content of the thickener in the sludge solid content parameter; The PAM agent cost per ton of absolute dry sludge is calculated based on the injection amount of the PAM solution, the sludge solid recovery rate, and the sludge inflow amount and sludge inflow concentration in the sludge inflow and sludge outflow related parameters; The sludge transportation cost per ton of absolute dry sludge and the sludge disposal cost per ton of absolute dry sludge are determined in combination with the sludge outflow moisture content; The normalized score of the current sludge treatment scenario on each evaluation index is obtained by the expert; The comprehensive score is calculated in combination with the normalized score and the weight of each evaluation index.

8. The method of claim 7, wherein the PAM is added to the sludge at a concentration of 0.1 to 10 mg / L. The sludge transportation cost per ton of absolute dry sludge and the sludge disposal cost per ton of absolute dry sludge are determined in combination with the sludge outflow moisture content, including: The sludge transportation cost per ton of wet sludge is obtained; The sludge transportation cost per ton of absolute dry sludge is calculated based on the sludge transportation cost per ton of wet sludge and the plate-and-frame sludge outflow moisture content; The sludge disposal cost per ton of wet sludge is obtained; The sludge disposal cost per ton of absolute dry sludge is calculated based on the sludge disposal cost per ton of wet sludge and the plate-and-frame sludge outflow moisture content.

9. A sludge dewatering system PAM drug efficacy evaluation device, characterized in that, It includes: The first recording module is configured to record the injection amount of the PAM solution with a specified concentration when the PAM solution is injected into the sludge in the thickener; The first obtaining module is configured to obtain the sludge inflow amount and sludge inflow concentration of the thickener and calculate the sludge inflow solid content rate parameter; The second recording module is configured to record the sludge inflow and sludge outflow related parameters when the sludge enters the dewatering stage after being thickened, so as to determine the sludge outflow moisture content; The first determining module is configured to determine the weight of each evaluation index, which is used to evaluate the efficacy of the PAM solution; The first calculating module is configured to calculate the comprehensive score of the PAM solution based on at least the injection amount of the PAM solution, the sludge inflow solid content rate parameter, the sludge inflow and sludge outflow related parameters, the sludge outflow moisture content, each evaluation index, and the corresponding weight; The second determining module is configured to determine the efficacy of the PAM solution based on the comprehensive score.

10. An electronic device, comprising: It includes: At least one processor; And The memory is in communication connection with the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the sludge dewatering system PAM efficacy evaluation method according to any one of claims 1-8.

Images