A kind of equipment and method for deep treatment of organic matter in wastewater from preserved fruit processing

Abstract

The present invention relates to the technical field of wastewater treatment for preserved fruits, and specifically to a device and method for deep treatment of organic matter in wastewater from preserved fruits. The wastewater treatment technology for preserved fruits that combines acid-resistant bacteria degradation with Fenton is adopted, and acidic preserved fruits wastewater is directly treated with acid-resistant bacteria, instead of adding alkali to adjust pH and coagulation and precipitation pretreatment, followed by deep treatment by Fenton and acid-resistant bacteria degradation. The process flow is as follows: regulating tank → acid-resistant bacteria degradation tank → sedimentation tank → Fenton oxidation tank → acid-resistant bacteria degradation tank → Fenton oxidation tank → sedimentation tank → biological filter tank. Compared with traditional wastewater treatment technology for preserved fruits, the wastewater treatment method for preserved fruits proposed by the present invention can achieve high-standard effluent discharge and significantly reduce effluent COD and chromaticity.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment for preserved fruits processing, and in particular relates to equipment and a method for deep treatment of organic matter in wastewater for preserved fruits processing. Background Art

[0002] The wastewater from preserved fruit processing includes drainage from salt soaking tanks, drainage from sugar soaking tanks, rinsing water from salt soaked fruits, etc., with rinsing water and drainage from sugar soaking tanks being the main ones. The amount of rinsing water is large, and the COD concentration of drainage from soaking tanks is high. The wastewater from preserved fruit processing is high-salt and high-organic wastewater with high BOD5 / COD and low nitrogen and phosphorus concentrations. Direct discharge into the water body will cause serious pollution to the water body, so it needs to be treated before discharge.

[0003] The existing wastewater treatment process for preserved fruits usually adopts the coagulation and sedimentation method for treatment. A large amount of coagulant and coagulant aid is required for coagulation and sedimentation of wastewater, which makes the cost of reagents high and produces a large amount of sludge. Therefore, it is necessary to adopt a biological treatment process to treat the wastewater.

[0004] When using biological treatment technology, acidic preserved fruit wastewater needs to add alkali to adjust the pH to adapt to the environmental conditions of microbial degradation. In some cases, the cost of adding alkali to adjust the pH is as high as 20 yuan / ton of water, which will increase the cost of wastewater treatment chemicals. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for deep treatment of organic matter in wastewater from processed fruit, aiming to adopt a wastewater treatment technology for processed fruit that combines acid-resistant bacteria degradation with Fenton, relying on acid-resistant bacteria to directly treat acidic wastewater from processed fruit, instead of adding alkali to adjust pH and coagulation and sedimentation pretreatment, thereby reducing the amount of alkali solution added and further reducing the cost of wastewater treatment agents.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a method for deep treatment of organic matter in wastewater from preserved fruit processing, comprising the following steps:

[0008] The preserved fruit wastewater with different organic matter concentrations generated in each process is homogenized and equalized in the regulating tank, and aerated and stirred with perforated pipes;

[0009] The homogenized preserved fruit wastewater enters the acid-resistant bacteria degradation pool, where the acid-resistant bacteria remove most of the organic matter under acidic conditions;

[0010] Retaining the biofilm sludge formed by the acid-resistant bacteria in the sedimentation tank, and transporting part of the sludge back to the acid-resistant bacteria degradation tank;

[0011] The first stage of Fenton oxidation is carried out in the Fenton oxidation tank, and the effluent from the sedimentation tank does not need to be acidified to adjust the pH;

[0012] The acid-resistant bacteria degradation pool removes the intermediate products of the first-stage Fenton oxidation under acidic conditions by acid-resistant microorganisms;

[0013] Then, the second stage Fenton oxidation is carried out in the Fenton oxidation tank, and the pH of the influent does not need to be adjusted by adding acid, and the pH of the effluent is adjusted to 7.5-8.5 by adding alkali;

[0014] The iron sludge formed after adding alkali to the effluent from the Fenton oxidation pond is intercepted in the sedimentation tank;

[0015] The effluent from the second-stage Fenton oxidation is deeply purified in the biofilter, while residual hydrogen peroxide is removed to eliminate the interference of hydrogen peroxide in COD detection of water samples.

[0016] Wherein, the acid-resistant bacteria degradation pool adopts three-dimensional elastic filler as the biofilm carrier.

[0017] The Fenton oxidation uses hydrogen peroxide and ferrous sulfate and takes advantage of the acidic conditions of the influent water, without the need to add acid to acidify the influent water.

[0018] The biofilter uses granular activated carbon as filler and is inoculated with ordinary activated sludge from a municipal sewage treatment plant.

[0019] The present invention also provides a device for deep treatment of organic matter in wastewater from processed preserved fruits, comprising a casing and an adjusting component; the adjusting component comprises a support seat, a rotating block, a guide rail, a sliding block, a movable rod, a stirring blade and a scraper, the support seat being fixedly mounted on the upper surface of the casing, the rotating block being used to rotate the guide rail, the guide rail being located on a side of the rotating block away from the support seat, the sliding block being slidably connected to the guide rail and being located on a side of the guide rail away from the rotating block, the movable rod being fixedly mounted on a side of the sliding block away from the guide rail, the stirring blade being used to stir and mix the wastewater and the degradation agent in the casing, and the scraper being located on a side of the stirring blade close to the casing.

[0020] Wherein, the adjustment assembly also includes a hydraulic cylinder and a telescopic rod, wherein the hydraulic cylinder is fixedly mounted on the lower surface of the support seat; the telescopic rod is connected to the output end of the hydraulic cylinder and is located on the lower surface of the hydraulic cylinder.

[0021] Wherein, the adjustment component also includes a fixing plate, which is fixedly mounted on the lower end of the telescopic rod and fixedly mounted on the outer side of the movable rod.

[0022] The invention discloses a kind of organic matter deep treatment equipment and method for wastewater from preserved fruits processing. By adopting the wastewater treatment technology combining acid-resistant bacteria degradation and Fenton, acidic wastewater is directly treated by acid-resistant bacteria, instead of adding alkali to adjust pH and coagulation and sedimentation pretreatment, followed by deep treatment by Fenton and acid-resistant bacteria degradation. The process flow is as follows: regulating tank → acid-resistant bacteria degradation tank → sedimentation tank → Fenton oxidation tank → acid-resistant bacteria degradation tank → Fenton oxidation tank → sedimentation tank → biological filter tank. Compared with the traditional wastewater treatment technology for preserved fruits, the wastewater treatment method for preserved fruits proposed by the invention can achieve high-standard effluent discharge and significantly reduce effluent COD and chromaticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0024] Figure 1 It is a flow chart of the process steps of the method for deep treatment of organic matter in wastewater from preserved fruit processing according to the first embodiment of the present invention.

[0025] Figure 2 It is a schematic flow chart of a method for deep treatment of organic matter in wastewater from preserved fruit processing according to a first embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the overall structure of the equipment for deep treatment of organic matter in wastewater from preserved fruits processing according to the second embodiment of the present invention.

[0027] Figure 4 It is a cross-sectional schematic diagram along a rotating rod of a device for deep treatment of organic matter in wastewater from preserved fruits according to a second embodiment of the present invention.

[0028] Figure 5 The second embodiment of the invention is a device for deep treatment of organic matter in wastewater from preserved fruits. Figure 4 Enlarged view of point A.

[0029] In the figure: 101-box, 102-adjusting component, 103-support seat, 104-rotating block, 105-guide rail, 106-slider, 107-movable rod, 108-mixing blade, 109-scraper, 110-hydraulic cylinder, 111-telescopic rod, 112-fixed plate, 113-control motor, 114-rotating rod, 115-blade body, 116-rotating plate. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] First embodiment

[0032] See also Figure 1-2 , Figure 11 is a flow chart of the method for deep treatment of organic matter in wastewater from preserved fruit processing according to the third embodiment. Figure 2 1 is a flow chart of a method for deep treatment of organic matter in wastewater from preserved fruit processing according to a first embodiment of the present invention. The present invention also provides a method for deep treatment of organic matter in wastewater from preserved fruit processing, comprising the following steps:

[0033] S101, the preserved fruit wastewater with different organic matter concentrations generated in each process is homogenized and equalized in the regulating tank, and aerated and stirred by perforated pipes;

[0034] S102, the homogenized preserved fruit wastewater enters the acid-resistant bacteria degradation pool, and the acid-resistant bacteria remove most of the organic matter under acidic conditions;

[0035] S103, intercepting the biofilm sludge formed by the acid-resistant bacteria in the sedimentation tank, and transferring part of the sludge back to the acid-resistant bacteria degradation tank;

[0036] S104, the first stage Fenton oxidation is carried out in the Fenton oxidation tank, and the effluent from the sedimentation tank does not need to be acidified to adjust the pH;

[0037] S105, the acid-resistant bacteria degradation pool removes the intermediate products of the first-stage Fenton oxidation under acidic conditions by acid-resistant microorganisms;

[0038] S106, then performing a second stage Fenton oxidation in the Fenton oxidation tank, the influent does not need to be acidified to adjust the pH, and the effluent is alkali-added to adjust the pH to 7.5-8.5;

[0039] S107, intercepting the iron sludge formed after adding alkali to the effluent of the Fenton oxidation pond in the sedimentation tank;

[0040] S108, deeply purify the effluent from the second stage Fenton oxidation in the biofilter, remove residual hydrogen peroxide and eliminate the interference of hydrogen peroxide in COD detection of water samples.

[0041] In this embodiment, when treating organic matter in wastewater from preserved fruit processing, acid-resistant bacteria degradation pretreatment and Fenton oxidation deep treatment are mainly relied on to achieve efficient removal of organic matter, significantly reduce chromaticity, and meet high-standard drainage requirements. The process advantages are as follows: (1) Acid-resistant bacteria directly treat acidic preserved fruit wastewater without the need to pre-add alkali to neutralize pH; (2) Fenton oxidation utilizes the acidic conditions of the influent and does not require acidification of the influent; (3) The two-stage Fenton-biodegradation combined process significantly reduces the amount of hydrogen peroxide used in Fenton oxidation; (4) It has strong resistance to organic load shock and high operational stability.

[0042] The acid-resistant bacteria degradation pool adopts three-dimensional elastic filler as biofilm carrier, the filling ratio of the three-dimensional elastic filler is 50% to 80%, and the biofilm formation of the filler is completed in about 5 days.

[0043] Secondly, the Fenton oxidation uses hydrogen peroxide and ferrous sulfate, and utilizes the acidic condition of the influent, and does not need to add acid to acidify the influent. When the first Fenton oxidation is performed, the residence time of the Fenton oxidation tank is 2 hours, the hydrogen peroxide dosage is 900-1200 mg / L, the ferrous sulfate dosage is 155-210 mg / L, and compressed air is stirred or a stirring paddle is used for mixing. When the second Fenton oxidation is performed, the residence time of the Fenton oxidation tank is 2 hours, the hydrogen peroxide dosage is 300-400 mg / L, the ferrous sulfate dosage is 55-70 mg / L, and compressed air is stirred or a stirring paddle is used for mixing.

[0044] Again, the biofilter uses granular activated carbon as filler and is inoculated with ordinary activated sludge from urban sewage treatment plants. The biofilter uses cylindrical granular activated carbon (6-8mm in diameter), a carbon layer height of 1.5-2.5m, a residence time of 2-4h, and a perforated aeration pipe at the bottom.

[0045] When using a method for deep treatment of organic matter in wastewater from processed fruit juice of the present embodiment, the wastewater from processed fruit juice is evenly mixed under the aeration and stirring action of the regulating tank, and the residence time is 5 to 7 days; part of the precipitated sludge (acid-resistant microorganisms) in the sedimentation tank is returned to the regulating tank, and the acid-resistant bacteria degrade the organic matter in the pre-treated acidic wastewater from the acid-resistant fruit juice; during the startup phase of the acid-resistant bacteria degradation tank, 10% to 20% of the tank volume of the acid-resistant microbial agent is added, the filling ratio of the three-dimensional elastic filler is 50% to 80%, and the filler biofilm is completed in about 5 days; the residence time in the acid-resistant bacteria degradation tank is 3 to 6 days; the sedimentation tank intercepts the biological sludge formed by the acid-resistant bacteria, and the sedimentation time is 2 to 4 hours. A part of the biological sludge is returned to the acid-resistant bacteria degradation tank, and the sludge return ratio is 30% to 50%; the remaining biological sludge is returned to the regulating tank; the residence time in the Fenton oxidation tank is 2 hours, the hydrogen peroxide dosage is 900 to 1200 mg / L, and the ferrous iron dosage is 100 to 200 mg / L. The acid-resistant bacteria degradation pool is 155-210 mg / L, and is stirred with compressed air or mixed with a stirring paddle; 10%-20% of the pool volume of acid-resistant microbial agents is added to the acid-resistant bacteria degradation pool, and the filling ratio of the three-dimensional elastic filler is 50%-80%, and the filler biofilm is completed in about 5 days; the residence time of the acid-resistant bacteria degradation pool is 1-2 days; the residence time of the Fenton oxidation pool is 2 hours, the hydrogen peroxide dosage is 300-400 mg / L, the ferrous iron dosage is 55-70 mg / L, and is stirred with compressed air or mixed with a stirring paddle; alkali is added to the effluent to adjust the pH to 7.5-8.5 to accelerate the precipitation of iron ions; the sedimentation tank intercepts the iron sludge formed by adding alkali to the effluent of the Fenton oxidation pool, and an inclined tube sedimentation tank is used with a sedimentation time of 0.5-2 hours; the biological filter uses cylindrical granular activated carbon (diameter 6-8 mm), the carbon layer height is 1.5-2.5 m, the residence time is 2-4 hours, and a perforated aeration pipe is provided at the bottom.

[0046] Specific examples are given below.

[0047] Example 1: Advanced treatment of organic matter in wastewater from preserved plum processing

[0048] The COD concentration of plum processing wastewater is 8500mg / L, pH 3.65, and salinity 2.6%. The regulating tank is aerated and stirred, and 5% of the tank volume of acid-resistant bacteria agent is added. The retention time is 7d, and the COD of the regulating tank effluent is 5250mg / L. The acid-resistant bacteria degradation tank 1 is inoculated with 10% of the tank volume of acid-resistant bacteria agent, the retention time is 5d, the effluent COD is 830mg / L, and the effluent pH is 4.10. The hydrogen peroxide dosage of Fenton oxidation tank 1 is 1200mg / L, the ferrous dosage is 210mg / L, the reaction is 2h, the effluent COD is 330mg / L, and the effluent pH is 3.80. The acid-resistant bacteria degradation tank 2 is inoculated with 20% of the tank volume of acid-resistant microbial agents, the retention time is 2d, the effluent COD is 285mg / L, and the effluent pH is 4.20. The hydrogen peroxide dosage of Fenton oxidation pool 2 was 300 mg / L, the ferrous iron dosage was 55 mg / L, the reaction time was 2 h, the effluent COD was 198 mg / L, and the effluent pH was 3.80. The influent pH of the biofilter was 7.6, the activated carbon layer height was 2 m, the empty bed retention time was 4 h, and the activated sludge from the aerobic pool of the municipal sewage treatment plant was inoculated, and the effluent COD was 110 mg / L.

[0049] Example 2: Advanced treatment of organic matter in wastewater from olive preserved fruit processing

[0050] The COD concentration of olive processing wastewater is 11030mg / L, pH 3.96, and salinity 3.92%. The regulating tank is aerated and stirred, and 10% of the tank volume of acid-resistant bacteria is added. The retention time is 5d, and the COD of the regulating tank effluent is 5700mg / L. Acid-resistant bacteria degradation pool 1 is inoculated with 10% of the tank volume of acid-resistant bacteria, and the retention time is 6d. The effluent COD is 1030mg / L and the effluent pH is 4.79. The hydrogen peroxide dosage of Fenton oxidation pool 1 is 1200mg / L, the ferrous dosage is 210mg / L, the reaction is 2h, the effluent COD is 520mg / L, and the effluent pH is 4.20. Acid-resistant bacteria degradation pool 2 is inoculated with 10% of the tank volume of acid-resistant microbial agents, the retention time is 2d, the effluent COD is 340mg / L, and the effluent pH is 4.96. The hydrogen peroxide dosage of Fenton oxidation pool 2 was 300 mg / L, the ferrous iron dosage was 55 mg / L, the reaction time was 2 h, the effluent COD was 226 mg / L, and the effluent pH was 4.54. The influent pH of the biofilter was 7.2, the activated carbon layer height was 2 m, the empty bed retention time was 3 h, and the activated sludge from the aerobic pool of the municipal sewage treatment plant was inoculated, and the effluent COD was 180 mg / L.

[0051] Second embodiment

[0052] Based on the first embodiment, please refer to Figure 3 to Figure 5 , Figure 3 is a schematic diagram of the overall structure of the equipment for deep treatment of organic matter in wastewater from preserved fruit processing according to the second embodiment of the present invention, Figure 41 is a cross-sectional schematic diagram of the device for deep treatment of organic matter in wastewater from preserved fruits according to the second embodiment of the present invention, taken along the rotating rod 114. Figure 5 The second embodiment of the invention is a device for deep treatment of organic matter in wastewater from preserved fruits. Figure 4 Enlarged view of point A. Figure 2 1 is a cross-sectional schematic diagram of a device for deep treatment of organic matter in wastewater from preserved fruits processing according to a first embodiment of the present invention. The present invention provides a device for deep treatment of organic matter in wastewater from preserved fruits processing, comprising a housing 101 and an adjustment assembly 102, wherein the adjustment assembly 102 comprises a support seat 103, a rotating block 104, a guide rail 105, a slider 106, a movable rod 107, a stirring blade 108, a scraper 109, a hydraulic cylinder 110, a telescopic rod 111 and a fixed plate 112, wherein the rotating block 104 comprises a control motor 113 and a rotating rod 114, and the stirring blade 108 comprises a blade body 115 and a rotating plate 116.

[0053] In this embodiment, the adjustment component 102 is located on one side of the box body 101, and is used to adjust the height of the scraper 109 so that the scraper 109 can scrape off the wastewater or degradation agent remaining on the inner wall of the box body 101, thereby avoiding the wastewater or degradation agent remaining on the inner wall of the box body 101, which may affect the reuse of the box body 101.

[0054] The support seat 103 is fixedly mounted on the upper surface of the box body 101, the rotating block 104 is used to rotate the guide rail 105, the guide rail 105 is located on the side of the rotating block 104 away from the support seat 103, the slider 106 is slidably connected to the guide rail 105 and is located on the side of the guide rail 105 away from the rotating block 104, the movable rod 107 is fixedly mounted on the side of the slider 106 away from the guide rail 105, the stirring blade 108 is used to stir and mix the wastewater and the degradation agent in the box body 101, and the scraper 109 is located in the The stirring blade 108 is close to one side of the box body 101, and the guide rail 105 has a vertical slide groove. The slider 106 cooperates with the vertical slide groove of the guide rail 105, so that the slider 106 can slide vertically in the vertical slide groove of the guide rail 105, and then the movable rod 107 can be limited, so that the movable rod 107 can only move up and down in the rotating rod 114, driving the rotating block 104, thereby driving the stirring blade 108 to rotate in the box body 101, and then driving the scraper 109 to rotate in the box body 101.

[0055] Secondly, the control motor 113 is fixedly mounted on the lower surface of the support base 103; the rotating rod 114 is connected to the output end of the control motor 113 and is fixedly mounted on the side of the guide rail 105 away from the slider 106. The output end of the control motor 113 is connected to the rotating rod 114 and drives the rotating rod 114 to rotate, thereby driving the guide rail 105 to rotate.

[0056] Again, the blade body 115 is fixedly mounted on the outer side of the movable rod 107 and is fixedly mounted on the side of the scraper 109 away from the box body 101; the rotating plate 116 is rotationally connected to the blade body 115 and is located on the lower surface of the blade body 115. The rotation of the movable rod 107 drives the blade body 115 to rotate horizontally, thereby driving the rotating plate 116 to rotate horizontally under the blade body 115. The rotating plate 116 is rotationally connected to the blade body 115, so that the rotating plate 116 can rotate vertically under the blade body 115.

[0057] In addition, the hydraulic cylinder 110 is fixedly mounted on the lower surface of the support seat 103; the telescopic rod 111 is connected to the output end of the hydraulic cylinder 110 and is located on the lower surface of the hydraulic cylinder 110, and the output end of the hydraulic cylinder 110 is connected to the telescopic rod 111 and drives the telescopic rod 111 to extend and retract.

[0058] Finally, the fixed plate 112 is fixedly installed at the lower end of the telescopic rod 111 and fixedly installed on the outer side of the movable rod 107. The telescopic rod 111 is extended and retracted to drive the fixed plate 112 to move up and down, thereby driving the movable rod 107 to move up and down in the rotating rod 114.

[0059] When using the device for deep treatment of organic matter in wastewater from preserved fruits processing of the present embodiment, the control motor 113 is started, so that the power outputted from the output end of the control motor 113 drives the rotating rod 114 to rotate, thereby driving the guide rail 105 to rotate, and then driving the slider 106 to rotate. The movable rod 107 is driven to rotate by the rotation of the slider 106, thereby driving the blade body 115 to rotate, and then driving the scraper 109 to rotate. The scraper 109 rotates in the box 101, so that the scraper 109 can scrape off the wastewater or degradation agent remaining on the inner wall of the box 101. The rotation of the blade body 115 drives the rotating plate 116 to rotate horizontally, and at the same time, the rotating plate 116 can rotate vertically under the blade body 115, so that the rotating plate 116 can flip the wastewater or degradation agent at the bottom of the box 101 to prevent the wastewater or degradation agent from being at the bottom of the box 101. The stacking is then performed, and then the hydraulic cylinder 110 is started, so that the power output from the output end of the hydraulic cylinder 110 drives the telescopic rod 111 to extend and retract, thereby driving the fixed plate 112 to move up and down, and then driving the movable rod 107 to move up and down in the rotating rod 114, and the movable rod 107 moves up and down in the rotating rod 114, thereby driving the slider 106 to move up and down in the slide groove of the guide rail 105, and at the same time, the blade body 115 can be driven to move up and down in the box 101, so that the scraper 109 moves up and down in the box 101, and then the height of the scraper 109 can be adjusted. By adjusting the height of the scraper 109, the scraper 109 can scrape off the wastewater or degradation agent remaining at different heights on the inner wall of the box 101, thereby avoiding a large amount of wastewater or degradation agent remaining on the inner wall of the box 101, which is easy to affect the reuse of the box 101.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A method for deep treatment of organic matter in wastewater from preserved fruit processing, characterized in that: The following steps are involved: The preserved fruit wastewater with different organic matter concentrations generated in each process is homogenized and equalized in the regulating tank, and aerated and stirred with perforated pipes; The homogenized preserved fruit wastewater enters the acid-resistant bacteria degradation pool, where the acid-resistant bacteria remove most of the organic matter under acidic conditions; Retaining the biofilm sludge formed by the acid-resistant bacteria in the sedimentation tank, and transporting part of the sludge back to the acid-resistant bacteria degradation tank; The first stage of Fenton oxidation is carried out in the Fenton oxidation tank, and the effluent from the sedimentation tank does not need to be acidified to adjust the pH; The acid-resistant bacteria degradation pool removes the intermediate products of the first-stage Fenton oxidation under acidic conditions by acid-resistant microorganisms; Then, the second stage Fenton oxidation is carried out in the Fenton oxidation tank, and the pH of the influent does not need to be adjusted by adding acid, and the pH of the effluent is adjusted to 7.5-8.5 by adding alkali; The iron sludge formed after adding alkali to the effluent from the Fenton oxidation pond is intercepted in the sedimentation tank; The effluent from the second-stage Fenton oxidation is deeply purified in the biofilter, and residual hydrogen peroxide is removed at the same time, eliminating the interference of hydrogen peroxide in COD detection of water samples; The Fenton oxidation uses hydrogen peroxide and ferrous sulfate and takes advantage of the acidic conditions of the influent water, and does not require the addition of acid to acidify the influent water.

2. The method for deep treatment of organic matter in wastewater from preserved fruit processing as claimed in claim 1, characterized in that: The acid-resistant bacteria degradation pool adopts three-dimensional elastic filler as a biofilm carrier.

3. The method for deep treatment of organic matter in wastewater from preserved fruit processing as claimed in claim 1, characterized in that: The biofilter uses granular activated carbon as filler and is inoculated with common activated sludge from a municipal sewage treatment plant.

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