Chemical wastewater treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly provides a chemical wastewater treatment system which comprises a pretreatment unit used for pretreating chemical wastewater with the chemical wastewater concentration exceeding a first preset value; the first collecting tank is used for collecting the chemical wastewater with the chemical wastewater concentration not exceeding a first preset value; an aeration adjusting tank; a hydrolysis acidification pool; an intermediate water tank; an anaerobic tower; a biochemical treatment unit; and a sludge thickener. The chemical wastewater is divided according to the chemical oxygen demand (COD) concentration, and the chemical wastewater with the COD concentration higher than the first preset value is pretreated, so that high-toxicity and refractory substances are prevented from directly entering a biochemical treatment unit, the subsequent treatment load is reduced, and the treatment efficiency is improved. The chemical wastewater lower than the first preset value and the pretreated chemical wastewater larger than the first preset value are mixed and homogenized in the aeration adjusting tank, the water quality stability is improved, the impact risk of a biochemical unit is reduced, the treatment of different concentrations and different types of chemical wastewater can be dealt with, and the treatment effect is stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sewage treatment technical field, concretely relates to a chemical industrial wastewater treatment system. BACKGROUND

[0002] At present, in the field of chemical industrial wastewater treatment, the chemical industrial wastewater is extremely complex, containing various organic matter, inorganic matter and heavy metal and other substances. These pollutants have the characteristics of high toxicity, high concentration and difficult degradation. In addition, the water quality and water quantity of chemical industrial wastewater fluctuate greatly, and the composition and flow of wastewater of different production processes and different batches may differ significantly.

[0003] In related technologies, when chemical industrial wastewater is treated, a one-size-fits-all treatment mode is adopted, that is, the chemical industrial wastewater is directly sent into a collection tank for collection, and then subsequent treatment is performed. Toxic substances (such as heavy metals and organic solvents) in the chemical industrial wastewater greater than a first preset value will inhibit microbial activity, leading to the collapse of the biochemical system. If all of the chemical industrial wastewater is put into a Fenton oxidation treatment process, it will lead to excessive addition of reagents, causing resource waste.

[0004] Therefore, how to treat chemical industrial wastewater of different concentrations is a technical problem to be solved at present.

[0005] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background of the present application, and therefore, the above description is not considered to constitute information of the prior art. CONTENT OF THE UTILITY MODEL

[0006] The embodiments of the present disclosure at least provide a chemical industrial wastewater treatment system.

[0007] In a first aspect, the embodiments of the present disclosure provide a chemical industrial wastewater treatment system, comprising:

[0008] a pretreatment unit configured to pretreat chemical industrial wastewater with a concentration exceeding a first preset value;

[0009] a first collection tank configured to collect chemical industrial wastewater with a concentration not exceeding the first preset value;

[0010] an aeration adjustment tank in communication with the pretreated chemical industrial wastewater and a drainage outlet of the first collection tank, and configured to homogenize the water quality of the wastewater entering the aeration adjustment tank;

[0011] a hydrolysis acidification tank in communication with the aeration adjustment tank;

[0012] an intermediate tank in communication with the hydrolysis acidification tank;

[0013] an anaerobic tower in communication with the intermediate tank;

[0014] a biochemical treatment unit, which is in communication with the anaerobic tower and is used for biochemical treatment of the chemical wastewater;

[0015] a sludge concentration tank, which is in communication with the sludge discharge pipe of the pretreatment unit and the sludge discharge pipe of the biochemical treatment unit respectively.

[0016] In an alternative embodiment, the pretreatment unit comprises:

[0017] a second collection tank, which is used for collecting the chemical wastewater whose concentration exceeds a second preset value, wherein the second preset value is greater than the first preset value;

[0018] a third collection tank, which is used for collecting the remaining chemical wastewater;

[0019] a pretreatment conditioning tank, which is in communication with the second collection tank and the third collection tank respectively and is used for homogenizing the quality of wastewater entering the pretreatment conditioning tank;

[0020] a Fenton treatment subunit, which is in communication with the pretreatment conditioning tank and is used for Fenton oxidation of the homogenized wastewater, and then discharges the treated wastewater to the aeration conditioning tank.

[0021] In an alternative embodiment, the pretreatment conditioning tank is also in communication with the aeration conditioning tank.

[0022] In an alternative embodiment, the Fenton treatment subunit further comprises:

[0023] a Fenton acid adjusting tank, a Fenton oxidation tank, a Fenton readjusting tank, a Fenton degassing tank, a Fenton flocculation tank and a Fenton sedimentation tank connected in sequence;

[0024] the Fenton treatment subunit discharges the wastewater to the aeration conditioning tank through the drain pipe of the Fenton sedimentation tank;

[0025] the sludge concentration tank is in communication with the sludge discharge pipe of the Fenton sedimentation tank.

[0026] In an alternative embodiment, the Fenton treatment subunit further comprises a post-Fenton effluent tank;

[0027] the drain pipe of the Fenton sedimentation tank is also in communication with the post-Fenton effluent tank;

[0028] the post-Fenton effluent tank is in communication with the discharge tank of the biochemical treatment unit.

[0029] In an alternative embodiment, the biochemical treatment unit comprises:

[0030] A primary sedimentation tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, a secondary sedimentation tank, a biochemical coagulation tank, a biochemical flocculation tank, a coagulation sedimentation tank and a discharge tank are sequentially connected.

[0031] In an alternative embodiment, a drain pipe of the discharge tank is in communication with the outside;

[0032] A backflow pipe of the discharge tank is in communication with the primary anoxic tank.

[0033] In an alternative embodiment, a sludge discharge pipe of the primary sedimentation tank is divided into two paths by a valve, one path being in communication with the intermediate tank to supply sludge to the anaerobic tower, and the other path being in communication with the sludge concentration tank;

[0034] A sludge discharge pipe of the secondary sedimentation tank is divided into four paths by a valve, one path being backflowed to the intermediate tank to supply sludge to the anaerobic tower, one path being backflowed to the hydrolysis acidification tank to supply biochemical sludge, one path being backflowed to the upper part of the primary anoxic tank, and one path being into the sludge concentration tank.

[0035] In an alternative embodiment, a sludge discharge pipe of the coagulation sedimentation tank is in communication with the sludge concentration tank.

[0036] In an alternative embodiment, the chemical wastewater treatment system further comprises a plate filter press;

[0037] The plate filter press is in communication with the sludge concentration tank.

[0038] The beneficial effects of the present chemical wastewater treatment system are as follows: the chemical wastewater treatment system divides the chemical wastewater according to the concentration of chemical oxygen demand (COD), pretreats the chemical wastewater with a COD concentration higher than a first preset value, avoids high-toxicity and hard-to-degrade substances from directly entering the biochemical treatment unit, reduces the subsequent treatment load, mixes and homogenizes the chemical wastewater with a COD concentration lower than the first preset value and the pretreated chemical wastewater with a COD concentration greater than the first preset value in the aeration adjustment tank, improves the water quality stability, reduces the biochemical unit impact risk, can cope with different concentrations and different types of chemical wastewater treatment, and has stable treatment effect.

[0039] Other features and advantages of the present utility model will be set forth in the subsequent description, and some will become apparent from the description, or will be understood from the practice of the present utility model. The objects and other advantages of the present utility model will be realized and achieved by the structure specifically indicated in the description and the drawings.

[0040] In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and easy to understand, the present paper will take a preferred embodiment, and cooperate with the attached drawings, and make a detailed description as follows. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0042] Figure 1 The principle block diagram of the chemical wastewater treatment system provided by the embodiments of the present application is provided.

[0043] Figure 2 The principle block diagram of the sludge treatment part provided by the embodiments of the present application is provided.

[0044] In the figure: 100, pretreatment unit; 110, second collection tank; 120, third collection tank; 130, pretreatment adjustment tank; 140, Fenton treatment subunit; 141, Fenton acid adjustment tank; 142, Fenton oxidation tank; 143, Fenton readjustment tank; 144, Fenton degassing tank; 145, Fenton flocculation tank; 146, Fenton sedimentation tank; 147, Fenton effluent tank; 200, first collection tank; 300, aeration adjustment tank; 400, hydrolysis acidification tank; 500, intermediate water tank; 600, anaerobic tower; 700, biochemical treatment unit; 710, primary sedimentation tank; 720, primary anoxic tank; 730, primary aerobic tank; 740, secondary anoxic tank; 750, secondary aerobic tank; 760, secondary sedimentation tank; 770, biochemical coagulation tank; 780, biochemical flocculation tank; 790, coagulation sedimentation tank; 791, discharge tank; 800, sludge thickening tank; 900, plate filter press. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely below with reference to the drawings, and obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0046] It is found through research that in the related art, when the chemical waste liquid is treated, it is not classified and treated according to the concentration, but directly treated through multiple processes in sequence, so that resources are wasted, for example, the use amount of Fenton reagent is increased, the energy consumption is increased, and the amount of propellant discharge is increased.

[0047] Based on the above research, the embodiments of the present application provide a chemical wastewater treatment system, which divides the chemical wastewater according to the COD concentration, and can cope with chemical wastewater treatment of different concentrations and different types.

[0048] The defects of the above solutions are the results of the inventors after practice and careful study, and therefore, the discovery process of the above problems and the solutions proposed by the present disclosure for the above problems should be the contributions of the inventors to the present disclosure.

[0049] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the embodiments described below and the features in the embodiments can be combined with each other.

[0051] Please refer to Figure 1 At least one embodiment provides a chemical wastewater treatment system, comprising:

[0052] The pretreatment unit 100 is used for pretreating the chemical wastewater whose concentration exceeds the first preset value.

[0053] The first collection tank 200 is used for collecting the chemical wastewater whose concentration does not exceed the first preset value.

[0054] The aeration adjustment tank 300 is in communication with the chemical wastewater treated by the pretreatment unit 100 and the drain port of the first collection tank 200 respectively, and is used for homogenizing the water quality of the wastewater entering the aeration adjustment tank 300. Specifically, the water quality homogenization is achieved by aeration stirring, and the COD fluctuation of the chemical wastewater is balanced.

[0055] The hydrolysis acidification tank 400 is in communication with the aeration adjustment tank 300. The wastewater is subjected to hydrolysis acidification reaction by the hydrolysis acidification tank 400.

[0056] The intermediate tank 500 is in communication with the hydrolysis acidification tank 400. The wastewater is subjected to buffering adjustment by the intermediate tank 500, and the inflow quantity in the subsequent tank body is balanced.

[0057] The anaerobic tower 600 is in communication with the intermediate tank 500. UASB (upflow anaerobic sludge reactor) is used for anaerobic treatment, and the organic pollutants in the wastewater are removed to a large extent in the anaerobic tower 600. The anaerobic biochemical technology greatly improves the biodegradability of the chemical wastewater, and achieves the purpose of full contact between sludge and water.

[0058] The biochemical treatment unit 700 is in communication with the anaerobic tower 600, and is used for biochemical treatment of the chemical wastewater.

[0059] A sludge concentration tank 800, which is communicated with the sludge discharge pipe of the pretreatment unit 100 and the sludge discharge pipe of the biochemical treatment unit 700 respectively.

[0060] Please continue to refer to Figure 1 The pretreatment unit 100 comprises:

[0061] A second collection tank 110 for collecting chemical wastewater with a concentration exceeding a second preset value, wherein the second preset value is greater than the first preset value. The first preset value and the second preset value are artificial values and are set according to the COD content in historical chemical wastewater. For example, in a certain chemical wastewater treatment, the first preset value is 1000 mg / L and the second preset value is 3000 mg / L.

[0062] A third collection tank 120 for collecting the remaining chemical wastewater, wherein the remaining chemical wastewater refers to chemical wastewater with a COD concentration between 1000 mg / L and 3000 mg / L.

[0063] A pretreatment conditioning tank 130, which is communicated with the second collection tank 110 and the third collection tank 120 respectively and is used for homogenizing the quality of wastewater entering the pretreatment conditioning tank 130. Specifically, different concentrations of wastewater are uniformly mixed by mechanical stirring to complete the homogenization of water quality.

[0064] A Fenton treatment subunit 140, which is communicated with the pretreatment conditioning tank 130 and is used for Fenton oxidation of the homogenized wastewater, and then discharges the treated wastewater to the aeration conditioning tank 300.

[0065] Please continue to refer to Figure 1 Specifically, the Fenton treatment subunit 140 further comprises a Fenton acid adjusting tank 141, a Fenton oxidation tank 142, a Fenton readjusting tank 143, a Fenton degassing tank 144, a Fenton flocculation tank 145 and a Fenton sedimentation tank 146 communicated in sequence; the Fenton treatment subunit 140 discharges wastewater to the aeration conditioning tank 300 through a drain pipe of the Fenton sedimentation tank 146; and the sludge concentration tank 800 is communicated with a sludge discharge pipe of the Fenton sedimentation tank 146.

[0066] By classifying chemical wastewater according to the concentration of chemical oxygen demand (COD), chemical wastewater with a COD concentration higher than a first preset value is pretreated to avoid high toxicity and difficult-to-degrade substances directly entering the biochemical treatment unit 700 and to reduce the subsequent treatment load.

[0067] The Fenton treatment subunit 140 further comprises a post-Fenton effluent tank 147; the drain pipe of the Fenton sedimentation tank 146 is further communicated with the post-Fenton effluent tank 147; the post-Fenton effluent tank 147 is communicated with the discharge tank 791 of the biochemical treatment unit 700. When the water quality in the drain pipe of the Fenton sedimentation tank 146 is detected by the detection equipment to be not up to the requirements, it is sent to the post-Fenton effluent tank 147 for backflow use of the discharge tank 791.

[0068] Specifically, the automatic dosing of sulfuric acid to the Fenton acidification tank 141 is controlled by an online pH instrument to adjust the pH value, the automatic dosing of liquid alkali to the Fenton neutralization tank 143 to neutralize the wastewater, the automatic dosing of hydrogen peroxide and ferrous sulfate to the Fenton oxidation tank 142 to perform Fenton oxidation reaction, the automatic dosing of PAM to the Fenton flocculation tank 145 to perform flocculation reaction, and finally the effluent enters the Fenton sedimentation tank 146 for solid-liquid separation to remove insoluble substances and neutralization reaction products in the wastewater, and the wastewater enters the aeration adjustment tank 300.

[0069] In the preferred embodiment, the pretreatment adjustment tank 130 is further communicated with the aeration adjustment tank 300. The water quality in the pretreatment adjustment tank 130 is detected by the detection equipment, and if the water quality is good, it is directly sent to the aeration adjustment tank 300. The water quality judgment standard is set according to the actual process, which can be set according to the COD concentration, the biodegradability (B / C ratio) and the toxic substance concentration, etc.

[0070] The pretreatment adjustment tank 130 controls whether the wastewater enters the aeration adjustment tank 300 or the Fenton acidification tank by setting a valve.

[0071] Please continue to refer to Figure 1 The biochemical treatment unit 700 comprises a primary sedimentation tank 710, a primary anoxic tank 720, a primary aerobic tank 730, a secondary anoxic tank 740, a secondary aerobic tank 750, a secondary sedimentation tank 760, a biochemical coagulation tank 770, a biochemical flocculation tank 780, a coagulation sedimentation tank 790 and a discharge tank 791 which are communicated in sequence.

[0072] The wastewater enters the primary anoxic tank 720, the primary aerobic tank 730, the secondary anoxic tank 740 and the secondary aerobic tank 750 in sequence, and through nitrification and denitrification reactions, further removes organic pollutants in the wastewater. The wastewater flows to the secondary sedimentation tank 760 for solid-liquid separation, and after removing the biochemical sludge in the wastewater, the wastewater enters the biochemical coagulation tank 770, the biochemical flocculation tank 780 and the coagulation sedimentation tank 790 in sequence, and PAC is automatically dosed to the biochemical coagulation tank 770 and PAM is automatically dosed to the biochemical flocculation tank 780 to perform coagulation and flocculation reactions. The wastewater is subjected to solid-liquid separation in the coagulation sedimentation tank 790, and then enters the discharge tank 791.

[0073] In a preferred embodiment, the drain pipe of the discharge water tank 791 is in communication with the outside; the backflow pipe of the discharge water tank 791 is in communication with the first-stage anoxic tank 720. By detecting the water quality in the discharge water tank 791, the unqualified wastewater is backflowed to the corresponding first-stage anoxic tank 720 and Fenton acidification tank 141, so that the unqualified water can be subjected to deep treatment, thereby ensuring that the wastewater meets the discharge standard.

[0074] Please continue to refer to Figure 1 The sludge discharge pipe of the first sedimentation tank 710 is divided into two routes by valve switching, one of which is in communication with the intermediate tank 500 to supplement sludge for the anaerobic tower 600, and the other of which is in communication with the sludge thickening tank 800; the sludge discharge pipe of the second sedimentation tank 760 is divided into four routes by valve switching, one of which is backflowed to the intermediate tank 500 to supplement sludge for the anaerobic tower 600, one of which is backflowed to the hydrolysis acidification tank 400 to supplement biochemical sludge, one of which is backflowed to the upper part of the first-stage anoxic tank 720, and one of which enters the sludge thickening tank 800. The sludge discharge pipe of the coagulation sedimentation tank 790 is in communication with the sludge thickening tank 800.

[0075] Among them, the valve is a solenoid valve.

[0076] Please refer to Figure 2 In an alternative embodiment, the chemical wastewater treatment system further comprises a plate filter press 900; the plate filter press 900 is in communication with the sludge thickening tank 800.

[0077] The data of the treatment of chemical wastewater in a week of a certain chemical park according to the above chemical wastewater treatment system are taken as examples, wherein the first preset value is 5000 mg / L, and the second preset value is 20000 mg / L.

[0078] The COD content data of the chemical wastewater in each tank when entering and leaving are shown in the following table:

[0079]

[0080] In the table, A / O tank represents the first-stage anoxic tank 720, the first-stage aerobic tank 730, the second-stage anoxic tank 740, and the second-stage aerobic tank 750 in the biochemical treatment unit 700 in sequence. The coagulation and flocculation device is the biochemical coagulation tank 770, the biochemical flocculation tank 780, and the coagulation sedimentation tank 790.

[0081] From the above table data, it can be seen that when treating tens of thousands of mg / L of chemical wastewater, the COD content of the discharge water in the total discharge water tank is about 150 mg / L after the treatment of different concentrations, which takes into account the economy, and the low-concentration chemical wastewater does not enter the Fenton treatment subunit for treatment, thereby reducing the wastewater treatment cost while ensuring the treatment effect of the chemical wastewater.

[0082] In conclusion, the utility model provides a kind of chemical wastewater treatment system by dividing chemical wastewater according to the concentration of chemical oxygen demand (COD), the chemical wastewater with COD concentration higher than first preset value is pretreated, avoid high toxicity, directly into biochemical treatment unit 700, reduce subsequent processing load, the chemical wastewater below first preset value is mixed with the chemical wastewater after pretreatment greater than first preset value in aeration regulation pool 300, improve water quality stability, reduce biochemical unit impact risk, can cope with different concentration, different kinds of chemical wastewater treatment, and treatment effect is stable.

[0083] With the above ideal embodiments of the present utility model as inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present utility model. The technical scope of the present utility model is not limited to the content in the specification, and must be determined by the scope of claims.

Claims

1. A chemical wastewater treatment system, characterized in that, include: The pretreatment unit (100) is used to pretreat chemical wastewater with a concentration exceeding a first preset value; The first collection tank (200) is used to collect chemical wastewater with a concentration not exceeding a first preset value; The aeration equalization tank (300) is connected to the chemical wastewater treated by the pretreatment unit (100) and the drain outlet of the first collection tank (200), and is used to equalize the water quality of the wastewater entering the aeration equalization tank (300). A hydrolysis acidification tank (400) is connected to the aeration and conditioning tank (300); An intermediate water tank (500) is connected to the hydrolysis acidification tank (400); An anaerobic tower (600) is connected to the intermediate water tank (500); A biochemical treatment unit (700) is connected to the anaerobic tower (600) and is used for biochemical treatment of chemical wastewater; The sludge thickening tank (800) is connected to the sludge discharge pipe of the pretreatment unit (100) and the sludge discharge pipe of the biochemical treatment unit (700).

2. The chemical wastewater treatment system as described in claim 1, characterized in that, The preprocessing unit (100) includes: The second collection tank (110) is used to collect chemical wastewater with a concentration exceeding a second preset value, wherein the second preset value is greater than the first preset value; The third collection tank (120) is used to collect the remaining chemical wastewater; A pretreatment equalization tank (130) is connected to the second collection tank (110) and the third collection tank (120) respectively, and is used to equalize the water quality of the wastewater entering the pretreatment equalization tank (130); The Fenton treatment subunit (140) is connected to the pretreatment equalization tank (130) and is used to perform Fenton oxidation on the wastewater after water quality equalization, and then discharge the treated wastewater to the aeration equalization tank (300).

3. The chemical wastewater treatment system as described in claim 2, characterized in that, The pretreatment conditioning tank (130) is also connected to the aeration conditioning tank (300).

4. The chemical wastewater treatment system as described in claim 2, characterized in that, The Fenton processing subunit (140) further includes: The Fenton acidification tank (141), Fenton oxidation tank (142), Fenton recovery tank (143), Fenton degassing tank (144), Fenton flocculation tank (145) and Fenton sedimentation tank (146) are connected in sequence. The Fenton treatment subunit (140) discharges wastewater to the aeration regulating tank (300) through the drain pipe of the Fenton sedimentation tank (146). The sludge thickening tank (800) is connected to the sludge discharge pipe of the Fenton sedimentation tank (146).

5. The chemical wastewater treatment system as described in claim 4, characterized in that, The Fenton treatment subunit (140) also includes a post-Fenton effluent tank (147). The drain pipe of the Fenton sedimentation tank (146) is also connected to the post-Fenton effluent tank (147); The post-Fenton effluent tank (147) is connected to the discharge tank (791) of the biochemical treatment unit (700).

6. The chemical wastewater treatment system as described in claim 1, characterized in that, The biochemical processing unit (700) includes: The first sedimentation tank (710), the first anoxic tank (720), the first aerobic tank (730), the second anoxic tank (740), the second aerobic tank (750), the second sedimentation tank (760), the biochemical coagulation tank (770), the biochemical flocculation tank (780), the coagulation sedimentation tank (790), and the discharge tank (791) are connected in sequence.

7. The chemical wastewater treatment system as described in claim 6, characterized in that, The drain pipe of the discharge pool (791) is connected to the outside; The return pipe of the discharge pool (791) is connected to the primary anoxic pool (720).

8. The chemical wastewater treatment system as described in claim 6, characterized in that, The sludge discharge pipe of the primary sedimentation tank (710) is switched by a valve and divided into two paths. One path is connected to the intermediate water tank (500) to replenish sludge to the anaerobic tower (600), and the other path is connected to the sludge thickening tank (800). The sludge discharge pipe of the secondary sedimentation tank (760) is switched by valves and divided into four paths: one path flows back to the intermediate water tank (500) to replenish sludge for the anaerobic tower (600); one path flows back to the hydrolysis acidification tank (400) to replenish biochemical sludge; one path flows back to the upper part of the primary anoxic tank (720); and one path enters the sludge thickening tank (800).

9. The chemical wastewater treatment system as described in claim 6, characterized in that, The sludge discharge pipe of the coagulation sedimentation tank (790) is connected to the sludge thickening tank (800).

10. The chemical wastewater treatment system as described in claim 1, characterized in that, The chemical wastewater treatment system also includes a plate filter press (900). The plate filter press (900) is connected to the sludge thickening tank (800).

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