Recovery treatment method of electroplating grinding wastewater

Abstract

The present invention relates to the technical field of electroplating grinding wastewater recovery, and discloses an electroplating grinding wastewater recovery treatment method, which comprises: arranging a flow divider perpendicular to the conveying direction of a conveyor belt on the conveyor belt, the flow divider being used for uniformly dividing to-be-treated sludge into a plurality of strip-shaped sludge; all the strip-shaped sludge divided by the flow divider forms sludge groups, and the sludge groups corresponding to the strip-shaped sludge with the first quantity, the second quantity,..., and the nth quantity are respectively marked as a first sludge group, a second sludge group,..., and an nth sludge group; squeezing and dewatering the sludge group; executing an overflow judgment strategy, and judging whether the sludge group is a candidate sludge group or not; obtaining the candidate sludge group with the lowest water content and recording the candidate sludge group as a target sludge group; obtaining a mud cake corresponding to the target sludge group, and recording the mud cake as a target mud cake; a pressure supplementing strategy is executed, and rollers are added for pressure supplementing when the to-be-treated sludge is squeezed and dewatered; targeted pressure supplement is achieved, the squeezing effect is optimized, and residual moisture is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating grinding wastewater recovery, and in particular to a method for recovering and treating electroplating grinding wastewater. Background Art

[0002] Wastewater generated during electroplating and grinding usually contains a large amount of heavy metals and other harmful substances. If these wastewaters are discharged directly without treatment, they will cause serious pollution to the environment. In order to solve this problem, precipitation is usually used to convert metal ions in wastewater into solid sludge for further treatment. Precipitation is the process of adding chemical reagents such as pH regulators and flocculants to cause metal ions dissolved in wastewater to form larger particles and settle down. Subsequently, these sludges need to be squeezed and dehydrated to reduce their volume and weight for transportation and subsequent disposal. Squeezing and dehydration is a key step, which squeezes out as much water as possible from the sludge through mechanical pressure, thereby reducing the water content of the sludge. This process not only affects the treatment efficiency, but also affects the treatment cost and environmental safety. Therefore, the development of efficient squeezing and dehydration technology and equipment, as well as the optimization of operating procedures, have become important research directions in the field of electroplating and grinding wastewater treatment. Correct squeezing technology can significantly improve the efficiency and environmental safety of sludge treatment, and is a key link in achieving zero discharge of wastewater and resource utilization.

[0003] The existing process of sludge squeezing and dehydrating is to first divide the sludge evenly into several strips of sludge for subsequent uniform squeezing and dehydration. Due to the shape of the strips of sludge, it will inevitably stretch during squeezing, and there will be stretched sludge between adjacent strips of sludge. However, the stretched sludge can never achieve the same dehydration effect as the center of the strips of sludge.

[0004] This scheme proposes to squeeze and dehydrate the sludge group, implement the overflow judgment strategy, obtain the candidate sludge group, obtain the candidate sludge group with the lowest moisture content to obtain the target sludge group, implement the pressure replenishment strategy, and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated. Summary of the invention

[0005] The present invention provides a method for recycling and treating electroplating grinding wastewater, which is used to promote solving the problems mentioned in the above background technology.

[0006] The present invention provides the following technical solution: a method for recycling electroplating grinding wastewater, comprising:

[0007] Obtain wastewater after electroplating and grinding;

[0008] Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge;

[0009] Collect the settled sludge and record it as sludge to be treated;

[0010] A flow divider is arranged on the conveyor belt and is perpendicular to the conveying direction of the conveyor belt. The flow divider is used to evenly divide the sludge to be treated into a plurality of strips of sludge;

[0011] Different flow dividers are used to divide the sludge to be treated on the conveyor belt into different numbers of strips of sludge;

[0012] The width and height of the strips of sludge divided by different diverters are equal;

[0013] In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different;

[0014] The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and the nth number in order from small to large;

[0015] All the strips of sludge formed by the flow divider are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group;

[0016] For each sludge group:

[0017] Squeeze and dewater the sludge group;

[0018] Execute the overflow determination strategy to determine whether the sludge group is a candidate sludge group;

[0019] A moisture content determination strategy is implemented for the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content;

[0020] The candidate sludge group with the lowest water content is recorded as the target sludge group;

[0021] Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake;

[0022] Implement the pressure replenishment strategy and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated.

[0023] Optionally, the execution overflow determination strategy includes:

[0024] When the sludge group is squeezed and dehydrated;

[0025] Determine whether sludge overflows from both sides of the conveyor belt:

[0026] The sludge group without sludge overflowing from both sides of the conveyor belt is recorded as a candidate sludge group.

[0027] Optionally, the squeezing and dehydrating of the sludge group includes:

[0028] A pressing plate is provided for pressing and dehydrating the sludge group, wherein the pressing plate is in a rectangular shape;

[0029] Obtain the area on the conveyor belt where squeezing and dehydration is performed, which is recorded as the squeezing area;

[0030] Get the length of the pressing area, recorded as the pressing length;

[0031] Obtain the width of the pressing area, recorded as the pressing width;

[0032] The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length;

[0033] The press plate is parallel to the conveyor belt and is located on top of the conveyor belt;

[0034] Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side;

[0035] A guide plate is provided for guiding the sludge group, wherein the guide plate is in a rectangular shape;

[0036] The width of the guide plate coincides with the first side edge, the guide plate is located on the top of the conveyor belt, and is inclined upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt;

[0037] A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge;

[0038] When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

[0039] Optionally, the moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, including:

[0040] The midpoint of each strip of sludge in the width direction is recorded as the sludge center point;

[0041] The midpoint of the line connecting the adjacent sludge center points on the same straight line is recorded as the interval center point;

[0042] Obtaining the mud cake after the candidate sludge group is squeezed and dehydrated;

[0043] Set the measurement interval for measuring the moisture content of mud cake;

[0044] Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt;

[0045] Obtain all sludge measuring points on the sludge cake, obtain the sludge cake on each sludge measuring point, and record the sludge sample of each sludge measuring point;

[0046] An interval measuring point is set at every measuring interval starting from the interval center point along the conveying direction of the conveyor belt;

[0047] Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record them as interval samples of each interval measurement point;

[0048] Measure the moisture content of all sludge samples;

[0049] Measure the moisture content of all interval samples;

[0050] The mean of all moisture contents was calculated and the result was taken as the moisture content of the candidate sludge group.

[0051] Optionally, the moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, including:

[0052] The moisture content is measured as follows:

[0053] The samples whose moisture content needs to be measured are recorded as experimental samples:

[0054] Obtain the weight of the experimental sample and record it as the total sample weight;

[0055] Dry the experimental sample, measure the weight of the experimental sample after drying, and record it as the sample weight;

[0056] Calculate (total sample weight - sample weight) / total sample weight = moisture content.

[0057] Optionally, the executing the pressure replenishment strategy includes:

[0058] Get any two adjacent sludge strips on the target mud cake:

[0059] For each strip of sludge:

[0060] The moisture content of all sludge samples on the strip sludge is obtained, and they are recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content;

[0061] Execute the following formula:

[0062] Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content;

[0063] The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

[0064] Optionally, the executing the pressure replenishment strategy includes:

[0065] When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides;

[0066] The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap;

[0067] The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content;

[0068] Execute the following formula:

[0069] Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determination moisture content;

[0070] Set the judgment ratio for determining whether to execute the pressure replenishment strategy;

[0071] When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent strips of sludge is recorded as the target pressure supplement mud cake.

[0072] Optionally, the executing the pressure replenishment strategy includes:

[0073] Get all the target pressure-replenishing mud cakes;

[0074] Compress mud cake for any target;

[0075] The target pressure-compensating mud cake is divided into a plurality of split mud cakes according to the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume;

[0076] For any split mud cake;

[0077] Measure the moisture content x of the split mud cake;

[0078] Get the thickness y of the split mud cake;

[0079] Calculate x*y and record the result as the compression height;

[0080] Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height;

[0081] Obtain the intersection of the straight line formed by the center points of the target pressure-compensating mud cakes and the first side edge of the press plate, and record it as the target pressure-compensating position of each target pressure-compensating mud cake on the press plate;

[0082] Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point;

[0083] A roller is arranged at each target positioning point of the roller, wherein the height of the target pressure-compensating mud cake squeezed by the roller is the corresponding target height.

[0084] The present invention has the following beneficial effects:

[0085] 1. The electroplating grinding wastewater recovery and treatment method uses different diverters to divide the sludge to be treated into strips of sludge of the same height and thickness but different quantities, so that when different numbers of strips of sludge are added in sequence for extrusion, the moisture content of the mud cake is measured, and the strips of sludge corresponding to the mud cake with the minimum moisture content are used as the standard number for dividing the sludge to be treated, thereby improving the standardization of wastewater treatment. Among them, an overflow judgment strategy is firstly executed for each sludge group to prevent sludge overflow during operation, and the sludge group is screened in the first step to improve the standardization of wastewater treatment and prevent accidents and waste of resources during the treatment process.

[0086] 2. The electroplating grinding wastewater recovery and treatment method uses the moisture content of the mud cake at the midpoint of the width direction of the strip sludge to represent the moisture content of the strip sludge, simplifies the treatment steps, improves efficiency, and helps to scientifically evaluate the treatment effect. The measurement interval is set, and a sludge measurement point is set every other measurement interval in the conveying direction of the conveyor belt. The mud cakes at multiple sludge measurement points are obtained to obtain multiple sludge samples. Similarly, multiple interval samples are obtained, and the moisture content of all sludge samples and interval samples is measured. The mean is calculated to obtain the moisture content of the mud cake. The mud cake with the minimum moisture content is used as the target mud cake. Multiple samples on the mud cake are obtained to calculate the moisture content. The moisture distribution of the entire sludge pressing block can be understood in detail, and it is helpful to evaluate the overall pressing effect, ensuring the accuracy and representativeness of the data, and helping to scientifically evaluate the treatment effect, determine the moisture content of each sludge group, select the best treatment plan, and optimize the entire treatment process.

[0087] 3. The electroplating grinding wastewater recovery and treatment method adds a pressing plate and a guide plate, and the divided strip sludge flows into the gap between the pressing plate and the conveyor belt through the guide plate, which is convenient for the subsequent dehydration of the sludge through the pressing plate, ensuring the uniformity and efficiency of the pressing process. The pressing effect can be further improved and the water content of the sludge can be reduced by roller pressure supplementation.

[0088] 4. The electroplating grinding wastewater recovery and treatment method uses a drying method to measure the moisture content in the process of determining the moisture content of the mud cake. This is an accurate method. Since the moisture can be completely removed, the data obtained is very reliable. This method can ensure the consistency and comparability between the various measurements, thereby effectively evaluating the pressing effect. The moisture content is calculated using a simple formula, which is easy to operate and understand, reducing the possibility of errors during operation and ensuring the accuracy of data processing.

[0089] 5. In the electroplating grinding wastewater recovery and treatment method, in the process of squeezing and dehydrating the strip sludge, the strip sludge will inevitably extend. In the actual application process, the extension areas of the strip sludge are overlapped, which can increase the number of strip sludge processed at one time, increase the amount of sludge to be processed at one time, and improve the dehydration efficiency. Since the height of the extension area is lower than the height of the squeezed strip sludge, even if the extension areas of two strips of sludge overlap, the same squeezing effect as the center of the strip sludge may not be achieved. Therefore, it is necessary to supplement the pressure of the interval area between adjacent strips of sludge to optimize the squeezing effect and reduce the residual moisture in the overlapping part of the extension area. Among them, the moisture content of the interval sample is compared with the average moisture content of the strip sludge. By determining the ratio, the area where the difference between the moisture content of the interval sample and the average moisture content of the strip sludge is too large is recorded as the target pressure-supplementing mud cake, and then a roller is added to the target pressure-supplementing mud cake for supplementary pressure. Targeted supplementary pressure is performed to optimize the squeezing effect and reduce residual moisture.

[0090] 6. The electroplating grinding wastewater recovery and treatment method evenly divides the target pressure-replenishing mud cake and measures the moisture content of each piece, which can more accurately control and adjust the squeezing process to ensure that each part achieves the best dehydration effect; the moisture content of each target pressure-replenishing mud cake is different. When the dehydration effect of the target pressure-replenishing mud cake is the same as the dehydration effect of the center of the strip sludge, the volume of the target pressure-replenishing mud cake will decrease, and the thickness of the target pressure-replenishing mud cake will be correspondingly considered to be reduced. The product of the moisture content and the thickness is calculated to obtain the compression height, which is the reduced thickness of the target pressure-replenishing mud cake. The compression height of all divided mud cakes is obtained, and the average is calculated as the reduced thickness of the entire target pressure-replenishing mud cake after compression again. At this time, a roller can be added so that the height of the target pressure-replenishing mud cake squeezed by the roller is just equal to the target height, ensuring the accuracy and effectiveness of the pressure-replenishing process; setting the roller to correspond to the target pressure-replenishing position can more accurately apply pressure to the problem area, optimize the dehydration effect and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 It is a schematic diagram of a press plate and a guide plate of the present invention;

[0092] Figure 2 This is a schematic diagram of the shape of the strip sludge after dehydration in the present invention;

[0093] Figure 3 A schematic diagram of the roller for adding a roller;

[0094] Figure 4 Schematic diagram of dividing mud cake. DETAILED DESCRIPTION

[0095] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0096] Embodiment 1, a method for recycling electroplating grinding wastewater, comprising:

[0097] Obtain wastewater after electroplating and grinding;

[0098] Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge;

[0099] Collect the settled sludge and record it as sludge to be treated;

[0100] A flow divider is arranged on the conveyor belt and is perpendicular to the conveying direction of the conveyor belt. The flow divider is used to evenly divide the sludge to be treated into a plurality of strips of sludge;

[0101] Different flow dividers are used to divide the sludge to be treated on the conveyor belt into different numbers of strips of sludge;

[0102] The width and height of the strips of sludge divided by different diverters are equal;

[0103] In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different;

[0104] The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and the nth number in order from small to large;

[0105] All the strips of sludge formed by the flow divider are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group;

[0106] For each sludge group:

[0107] Squeeze and dewater the sludge group;

[0108] Execute the overflow determination strategy to determine whether the sludge group is a candidate sludge group;

[0109] A moisture content determination strategy is implemented for the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content;

[0110] The candidate sludge group with the lowest water content is recorded as the target sludge group;

[0111] Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake;

[0112] Implement the pressure replenishment strategy and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated.

[0113] The execution overflow determination strategy includes:

[0114] When the sludge group is squeezed and dehydrated;

[0115] Determine whether sludge overflows from both sides of the conveyor belt:

[0116] The sludge group without sludge overflowing from both sides of the conveyor belt is recorded as a candidate sludge group.

[0117] Different diverters are used to divide the sludge to be treated into strips of sludge of the same height and thickness but different quantities, so that when different numbers of sludge strips are added in sequence for extrusion, the moisture content of the sludge cake is measured. The sludge strips corresponding to the sludge cake with the minimum moisture content are used as the standard number for dividing the sludge to be treated, thereby improving the standardization of wastewater treatment. First, an overflow judgment strategy is implemented for each sludge group to prevent sludge overflow during operation, and the sludge group is screened in the first step to improve the standardization of wastewater treatment and prevent accidents and waste of resources during the treatment process.

[0118] The method of squeezing and dehydrating the sludge group comprises:

[0119] A pressing plate is provided for pressing and dehydrating the sludge group, wherein the pressing plate is in a rectangular shape;

[0120] Obtain the area on the conveyor belt where squeezing and dehydration is performed, which is recorded as the squeezing area;

[0121] Get the length of the pressing area, recorded as the pressing length;

[0122] Obtain the width of the pressing area, recorded as the pressing width;

[0123] The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length;

[0124] The press plate is parallel to the conveyor belt and is located on top of the conveyor belt;

[0125] Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side;

[0126] A guide plate is provided for guiding the sludge group, wherein the guide plate is in a rectangular shape;

[0127] The width of the guide plate coincides with the first side edge, the guide plate is located on the top of the conveyor belt, and is inclined upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt;

[0128] A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge;

[0129] When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

[0130] In this embodiment, refer to Figure 1 , the positional relationship between the conveyor belt, press plate and guide plate.

[0131] By adding pressing plates and guide plates, the divided strip sludge will flow into the gap between the pressing plate and the conveyor belt through the guide plate, which is convenient for subsequent dehydration of the sludge through the pressing plate, ensuring the uniformity and efficiency of the pressing process. By adding roller pressure, the pressing effect can be further improved and the moisture content of the sludge can be reduced.

[0132] The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes:

[0133] The midpoint of each strip of sludge in the width direction is recorded as the sludge center point;

[0134] In this embodiment, the position of the sludge center point is referenced Figure 2 ;

[0135] The midpoint of the line connecting the adjacent sludge center points on the same straight line is recorded as the interval center point;

[0136] In this embodiment, the position of the interval center point is referenced Figure 1 ;

[0137] Obtaining the mud cake after the candidate sludge group is squeezed and dehydrated;

[0138] Set the measurement interval for measuring the moisture content of mud cake;

[0139] Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt;

[0140] Obtain all sludge measuring points on the sludge cake, obtain the sludge cake on each sludge measuring point, and record the sludge sample of each sludge measuring point;

[0141] An interval measuring point is set at every measuring interval starting from the interval center point along the conveying direction of the conveyor belt;

[0142] Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record them as interval samples of each interval measurement point;

[0143] Measure the moisture content of all sludge samples;

[0144] Measure the moisture content of all interval samples;

[0145] The mean of all moisture contents was calculated and the result was taken as the moisture content of the candidate sludge group.

[0146] The moisture content of the mud cake at the midpoint of the width direction of the sludge strip is used to represent the moisture content of the sludge strip, which simplifies the processing steps, improves efficiency, and helps to scientifically evaluate the treatment effect. The measurement interval is set, and a sludge measurement point is set every other measurement interval in the conveying direction of the conveyor belt. The mud cakes at multiple sludge measurement points are obtained to obtain multiple sludge samples. Similarly, multiple interval samples are obtained, and the moisture content of all sludge samples and interval samples is measured. The mean is calculated to obtain the moisture content of the mud cake. The mud cake with the minimum moisture content is used as the target mud cake. Multiple samples on the mud cake are obtained to calculate the moisture content. This can provide a detailed understanding of the moisture distribution of the entire sludge pressing block, and at the same time help to evaluate the overall pressing effect, ensure the accuracy and representativeness of the data, help to scientifically evaluate the treatment effect, determine the moisture content of each sludge group, select the best treatment plan, and optimize the entire treatment process.

[0147] The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes:

[0148] The moisture content is measured as follows:

[0149] The samples whose moisture content needs to be measured are recorded as experimental samples:

[0150] Obtain the weight of the experimental sample and record it as the total sample weight;

[0151] Dry the experimental sample, measure the weight of the experimental sample after drying, and record it as the sample weight;

[0152] Calculate (total sample weight - sample weight) / total sample weight = moisture content.

[0153] In the process of determining the moisture content of mud cake, the drying method is an accurate method to measure the moisture content. Since the moisture can be completely removed, the data obtained is very reliable. This method can ensure the consistency and comparability between the various measurements, thereby effectively evaluating the pressing effect. The moisture content is calculated using a simple formula, which is easy to operate and understand, reducing the possibility of errors during operation and ensuring the accuracy of data processing.

[0154] The implementation of the pressure replenishment strategy includes:

[0155] Get any two adjacent sludge strips on the target mud cake:

[0156] For each strip of sludge:

[0157] The moisture content of all sludge samples on the strip sludge is obtained, and they are recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content;

[0158] Execute the following formula:

[0159] Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content;

[0160] The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

[0161] The implementation of the pressure replenishment strategy includes:

[0162] When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides;

[0163] The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap;

[0164] In this embodiment, the shape of the strip sludge extension area refers to Figure 2 ;

[0165] The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content;

[0166] Execute the following formula:

[0167] Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determination moisture content;

[0168] Set the judgment ratio for determining whether to execute the pressure replenishment strategy;

[0169] When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent strips of sludge is recorded as the target pressure supplement mud cake.

[0170] In the process of squeezing and dehydrating the strip sludge, the strip sludge will inevitably extend. In the actual application process, the extension areas of the strip sludge are overlapped, which can increase the number of strip sludge processed at one time, increase the amount of sludge to be processed at one time, and improve the dehydration efficiency. Since the height of the extension area is lower than the height of the squeezed strip sludge, even if the extension areas of two strips of sludge overlap, the same squeezing effect as the center of the strip sludge may not be achieved. Therefore, it is necessary to supplement the pressure on the interval area between adjacent strips of sludge to optimize the squeezing effect and reduce the residual moisture in the overlapping part of the extension area. Among them, the moisture content of the interval sample is compared with the average moisture content of the strip sludge. By determining the ratio, the area where the difference between the moisture content of the interval sample and the average moisture content of the strip sludge is too large is recorded as the target pressure-supplementing mud cake, and then a roller is added to the target pressure-supplementing mud cake for supplementary pressure. Targeted pressure supplementation can be performed to optimize the squeezing effect and reduce residual moisture.

[0171] The implementation of the pressure replenishment strategy includes:

[0172] Get all the target pressure-replenishing mud cakes;

[0173] Compress mud cake for any target;

[0174] The target pressure-compensating mud cake is divided into a plurality of split mud cakes according to the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume;

[0175] For any split mud cake;

[0176] Measure the moisture content x of the split mud cake;

[0177] Get the thickness y of the split mud cake;

[0178] Calculate x*y and record the result as the compression height;

[0179] Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height;

[0180] Obtain the intersection of the straight line formed by the center points of the target pressure-compensating mud cakes and the first side edge of the press plate, and record it as the target pressure-compensating position of each target pressure-compensating mud cake on the press plate;

[0181] Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point;

[0182] A roller is arranged at each target positioning point of the roller, wherein the height of the target pressure-compensating mud cake squeezed by the roller is the corresponding target height.

[0183] In this embodiment, the compression height of the split mud cake is referenced to Figure 4 ;

[0184] In this embodiment, the roller shaft diagram of the additional roller is shown in FIG. Figure 3 In this embodiment, the number of sludge strips is 2, which are respectively recorded as the first sludge strip and the second sludge strip; the position of the target pressure supplementary mud cake is the overlapping position of the two sludge strip extension areas.

[0185] Evenly dividing the target pressure boosting mud cake and measuring the moisture content of each piece can more accurately control and adjust the squeezing process to ensure that each part achieves the best dehydration effect; the moisture content of each target pressure boosting mud cake is different. When the dehydration effect of the target pressure boosting mud cake is the same as the dehydration effect of the center of the strip sludge, the volume of the target pressure boosting mud cake will decrease, and the thickness of the target pressure boosting mud cake will be correspondingly considered to be reduced. The product of the moisture content and the thickness is calculated to obtain the compression height, which is the reduced thickness of the target pressure boosting mud cake. The compression height of all divided mud cakes is obtained, and the average is calculated as the reduced thickness of the entire target pressure boosting mud cake after compression again. At this time, a roller can be added so that the height of the target pressure boosting mud cake squeezed by the roller is exactly equal to the target height, ensuring the accuracy and effectiveness of the pressure boosting process; setting the roller to correspond to the target pressure boosting position can more accurately apply pressure to the problem area, optimize the dehydration effect and save energy.

[0186] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0187] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for recycling electroplating grinding wastewater, comprising: Obtain wastewater after electroplating and grinding; Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge; Collect the settled sludge and record it as sludge to be treated; A flow divider is arranged on the conveyor belt and is perpendicular to the conveying direction of the conveyor belt. The flow divider is used to evenly divide the sludge to be treated into a plurality of strips of sludge; Different flow dividers are used to divide the sludge to be treated on the conveyor belt into different numbers of strips of sludge; The width and height of the strips of sludge divided by different diverters are equal; In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different; The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and the nth number in order from small to large; All the strips of sludge formed by the flow divider are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group; For each sludge group: Squeeze and dewater the sludge group; Execute the overflow determination strategy to determine whether the sludge group is a candidate sludge group; A moisture content determination strategy is implemented for the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content; The candidate sludge group with the lowest water content is recorded as the target sludge group; Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake; Implement the pressure replenishment strategy and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated.

2. The method for recycling electroplating grinding wastewater according to claim 1, characterized in that: The execution overflow determination strategy includes: When the sludge group is squeezed and dehydrated; Determine whether sludge overflows from both sides of the conveyor belt: The sludge group without sludge overflowing from both sides of the conveyor belt is recorded as a candidate sludge group.

3. The method for recycling electroplating grinding wastewater according to claim 1, characterized in that: The squeezing and dehydrating of the sludge group comprises: A pressing plate is provided for pressing and dehydrating the sludge group, wherein the pressing plate is in a rectangular shape; Obtain the area on the conveyor belt where squeezing and dehydration is performed, which is recorded as the squeezing area; Get the length of the pressing area, recorded as the pressing length; Obtain the width of the pressing area, recorded as the pressing width; The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length; The press plate is parallel to the conveyor belt and is located on top of the conveyor belt; Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side; A guide plate is provided for guiding the sludge group, wherein the guide plate is in a rectangular shape; The width of the guide plate coincides with the first side edge, the guide plate is located on the top of the conveyor belt, and is inclined upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt; A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge; When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

4. The method for recycling electroplating grinding wastewater according to claim 1, characterized in that: The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes: The midpoint of each strip of sludge in the width direction is recorded as the sludge center point; The midpoint of the line connecting the adjacent sludge center points on the same straight line is recorded as the interval center point; Obtaining the mud cake after the candidate sludge group is squeezed and dehydrated; Set the measurement interval for measuring the moisture content of mud cake; Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt; Obtain all sludge measuring points on the sludge cake, obtain the sludge cake on each sludge measuring point, and record the sludge sample of each sludge measuring point; An interval measuring point is set at every measuring interval starting from the interval center point along the conveying direction of the conveyor belt; Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record them as interval samples of each interval measurement point; Measure the moisture content of all sludge samples; Measure the moisture content of all interval samples; The mean of all moisture contents was calculated and the result was taken as the moisture content of the candidate sludge group.

5. The method for recycling electroplating grinding wastewater according to claim 4, characterized in that: The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes: The moisture content is measured as follows: The samples whose moisture content needs to be measured are recorded as experimental samples: Obtain the weight of the experimental sample and record it as the total sample weight; Dry the experimental sample, measure the weight of the experimental sample after drying, and record it as the sample weight; Calculate (total sample weight - sample weight) / total sample weight = moisture content.

6. The method for recycling electroplating grinding wastewater according to claim 1, characterized in that: The implementation of the pressure replenishment strategy includes: Get any two adjacent sludge strips on the target mud cake: For each strip of sludge: The moisture content of all sludge samples on the strip sludge is obtained, and they are recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content; Execute the following formula: Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content; The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

7. The method for recycling electroplating grinding wastewater according to claim 6, characterized in that: The implementation of the pressure replenishment strategy includes: When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides; The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap; The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content; Execute the following formula: Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determination moisture content; Set the judgment ratio for determining whether to execute the pressure replenishment strategy; When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent strips of sludge is recorded as the target pressure supplement mud cake.

8. The method for recycling electroplating grinding wastewater according to claim 7, characterized in that: The implementation of the pressure replenishment strategy includes: Get all the target pressure-replenishing mud cakes; Compress mud cake for any target; The target pressure-compensating mud cake is divided into a plurality of split mud cakes according to the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume; For any split mud cake; Measure the moisture content x of the split mud cake; Get the thickness y of the split mud cake; Calculate x*y and record the result as the compression height; Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height; Obtain the intersection of the straight line formed by the center points of the target pressure-compensating mud cakes and the first side edge of the press plate, and record it as the target pressure-compensating position of each target pressure-compensating mud cake on the press plate; Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point; A roller is arranged at each target positioning point of the roller, wherein the height of the target pressure-compensating mud cake squeezed by the roller is the corresponding target height.

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