Multi-stage sedimentation tank and wastewater treatment process

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a multi-stage sedimentation tank and a wastewater treatment process, which comprises the following steps: pretreating large particles and suspended solids in wastewater; introducing the pretreated wastewater into a multi-stage sedimentation tank for treatment; preliminarily filtering the treated wastewater through a filter; putting an adsorbent into the preliminarily filtered wastewater for adsorption treatment; carrying out degradation treatment on the wastewater subjected to adsorption treatment; and sterilizing the degraded wastewater and then discharging the wastewater. Through the multi-stage sedimentation design, each stage of sedimentation tank can remove suspended matters and soluble organic matters with different sizes and types in a targeted manner, so that the overall treatment efficiency is improved. Compared with a single settling tank, the multi-stage settling tank can quickly and effectively reduce the concentration of pollutants in the wastewater, so that the problem of low efficiency of the existing wastewater treatment process is solved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a multi-stage sedimentation tank and a wastewater treatment process. Background Art

[0002] At present, industrial wastewater treatment often adopts the traditional single sedimentation tank structure, which has problems such as low treatment efficiency and substandard wastewater discharge. In order to solve these problems, it is necessary to propose a new multi-stage sedimentation tank wastewater treatment process, which can improve the treatment efficiency, extract the raw materials in the wastewater, and reduce the wastewater discharge concentration at the same time, meeting environmental protection requirements. Summary of the invention

[0003] The object of the present invention is to provide a multi-stage sedimentation tank and a wastewater treatment process, aiming to solve the problem of low efficiency of existing wastewater treatment processes.

[0004] To achieve the above object, the present invention provides a multi-stage sedimentation tank and a wastewater treatment process, comprising the following steps:

[0005] Pre-treat large particles and suspended solids in wastewater;

[0006] The pretreated wastewater is introduced into a multi-stage sedimentation tank for treatment;

[0007] Perform preliminary filtration of the treated wastewater through filters;

[0008] placing the adsorbent into the preliminarily filtered wastewater for adsorption treatment;

[0009] Degrading the wastewater after adsorption treatment;

[0010] The degraded wastewater is disinfected before being discharged.

[0011] Among them, in "pre-treatment of large particles and suspended solids in wastewater", it includes:

[0012] The wastewater passes through the screen equipment to intercept and remove large particles in the wastewater;

[0013] The removed wastewater is introduced into the grit chamber to settle the suspended matter to the bottom through sedimentation.

[0014] Among them, in "introducing the pre-treated wastewater into a multi-stage sedimentation tank for treatment", the following steps are included:

[0015] The pretreated wastewater is introduced into the primary sedimentation tank and a coagulant is added for primary sedimentation;

[0016] The settled wastewater is introduced into the secondary sedimentation tank and a coagulant is added thereto for secondary sedimentation.

[0017] Among them, in "preliminary filtering of the treated wastewater through a filter", the following steps are included:

[0018] introducing treated wastewater into the filter;

[0019] The wastewater is initially purified by the filter material filled inside the filter.

[0020] Among them, in "putting the adsorbent into the wastewater after preliminary filtration for adsorption treatment", the following steps are included:

[0021] Sampling and testing the wastewater after preliminary filtration to obtain pollutant analysis data;

[0022] Selecting a corresponding adsorbent based on the pollutant analysis data;

[0023] The adsorbent is introduced into the wastewater for adsorption treatment.

[0024] Among them, in "degrading the wastewater after adsorption treatment", the following steps are included:

[0025] Conduct pollution concentration test on wastewater after adsorption treatment;

[0026] Based on the concentration detection data, a corresponding degradation method is selected to perform degradation treatment on the wastewater.

[0027] In a second aspect, a multi-stage sedimentation tank is used in the multi-stage sedimentation tank wastewater treatment process described in the first aspect, comprising a sedimentation tank, a primary sedimentation tank and a secondary sedimentation tank.

[0028] A multi-stage sedimentation tank and wastewater treatment process of the present invention include the following steps: pre-treating large particles and suspended matter in wastewater; introducing the pre-treated wastewater into a multi-stage sedimentation tank for treatment; preliminarily filtering the treated wastewater through a filter; placing an adsorbent into the preliminarily filtered wastewater for adsorption treatment; degrading the wastewater after adsorption treatment; and discharging the degraded wastewater after disinfection. The present invention adopts a multi-stage sedimentation design, and each sedimentation tank can remove suspended matter and soluble organic matter of different sizes and types in a targeted manner, thereby improving the overall treatment efficiency. Compared with a single sedimentation tank, a multi-stage sedimentation tank can reduce the concentration of pollutants in wastewater more quickly and effectively to ensure that the discharge meets the standards: the multi-stage sedimentation tank combines a variety of treatment methods such as coagulation, sedimentation, filtration, adsorption and degradation to form a complete wastewater treatment chain. This comprehensive treatment method can more comprehensively remove pollutants in wastewater and ensure that the discharge concentration after wastewater treatment meets environmental protection standards. In the treatment process of the multi-stage sedimentation tank, through reasonable process design and parameter adjustment, effective extraction of raw materials (such as some valuable metal ions, organic matter, etc.) in wastewater can be achieved. This not only helps to recycle resources, but also reduces treatment costs. The new multi-stage sedimentation tank wastewater treatment process can be flexibly adjusted according to the specific composition and concentration of the wastewater. For example, by changing the type and dosage of coagulants, adjusting parameters such as sedimentation time and filtration speed, effective treatment of different types of wastewater can be achieved. By improving the efficiency and quality of wastewater treatment, the new multi-stage sedimentation tank wastewater treatment process helps to reduce environmental pollution and protect water resources. At the same time, the process also promotes the recycling and sustainable development of resources, which is in line with the current development trend of environmental protection and energy conservation. This solves the problem of low efficiency of existing wastewater treatment processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The present invention provides a flowchart of a multi-stage sedimentation tank wastewater treatment process.

[0031] Figure 2 This is a flow chart for pre-treating large particles and suspended matter in wastewater.

[0032] Figure 3 It is a flow chart of introducing pretreated wastewater into multi-stage sedimentation tanks for treatment.

[0033] Figure 4It is a flow chart of the preliminary filtration of treated wastewater through filters.

[0034] Figure 5 It is a flow chart of placing adsorbent into wastewater after preliminary filtration for adsorption treatment.

[0035] Figure 6 This is a flow chart of the degradation treatment of wastewater after adsorption treatment.

[0036] Figure 7 It is a schematic diagram of a multi-stage sedimentation tank provided by the present invention.

[0037] In the figure: 1-sedimentation tank, 2-primary sedimentation tank, 3-secondary sedimentation tank. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] See also Figures 1 to 6 The present invention provides a multi-stage sedimentation tank and a wastewater treatment process, comprising the following steps:

[0040] S1 pre-treats large particles and suspended solids in wastewater;

[0041] S11 wastewater is intercepted by screen equipment to remove large particles in the wastewater;

[0042] Specifically, the wastewater first flows through the screen equipment, which consists of a series of parallel metal bars, the gap size of which is designed according to the size of the particles in the wastewater. Large particles such as wood blocks and plastic fragments are effectively intercepted by the screen.

[0043] The wastewater taken out from S12 is introduced into the grit chamber to settle the suspended solids to the bottom through sedimentation.

[0044] Specifically, the wastewater intercepted by the screen is introduced into the grit chamber. The grit chamber is designed with appropriate flow rate and residence time to allow the suspended matter in the wastewater to settle to the bottom under the action of gravity. As the sediment accumulates, it is regularly discharged from the tank through mud discharge equipment to maintain the effective operation of the grit chamber.

[0045] S2 introduces the pretreated wastewater into a multi-stage sedimentation tank for treatment;

[0046] S21 introduces the pretreated wastewater into the primary sedimentation tank 2 and adds a coagulant for primary sedimentation;

[0047] Specifically, the wastewater first enters the primary sedimentation tank 2, and a coagulant (such as polyaluminium chloride, iron salt, etc.) is added. The coagulant reacts chemically with the suspended matter and colloidal particles in the water to form larger flocs. Within an appropriate residence time, these flocs settle to the bottom under the action of gravity to form sludge.

[0048] S22 introduces the settled wastewater into the secondary sedimentation tank 3 and adds a coagulant for secondary sedimentation.

[0049] Specifically, the wastewater treated in the primary sedimentation tank 2 enters the secondary sedimentation tank 3. At this stage, coagulant is added again for secondary sedimentation. The design of the secondary sedimentation tank 3 is usually more sophisticated than the primary one to remove more suspended matter and tiny particles. Through this step, the concentration of suspended matter in the wastewater is significantly reduced.

[0050] S3 performs preliminary filtration on the treated wastewater through a filter;

[0051] S31 introduces the treated wastewater into the filter;

[0052] Specifically, wastewater is introduced into the interior of the filter, which is usually made of stainless steel or plastic and filled with filter materials including sand, activated carbon and ceramics.

[0053] S32 performs preliminary purification of wastewater through the filter material filled inside the filter.

[0054] Specifically, when wastewater passes through the filter material, suspended solids, colloidal particles and some soluble organic matter are trapped on the surface or inside the filter material. As the filtration process proceeds, the filter material gradually accumulates pollutants and needs to be cleaned or replaced regularly to maintain its filtration efficiency.

[0055] S4 puts the adsorbent into the wastewater after preliminary filtration for adsorption treatment;

[0056] S41 samples and tests the wastewater after preliminary filtration to obtain pollutant analysis data;

[0057] Specifically, the wastewater after preliminary filtration is sampled and tested to analyze the types and concentrations of pollutants therein.

[0058] S42 selects a corresponding adsorbent based on the pollutant analysis data;

[0059] Specifically, based on the pollutant analysis data, an adsorbent with targeted adsorption capacity is selected, and the adsorbent includes activated carbon, resin, and zeolite.

[0060] S43 introduces adsorbent into the wastewater for adsorption treatment.

[0061] Specifically, the selected adsorbent is introduced into the wastewater to adsorb the pollutants in the wastewater through physical or chemical effects.

[0062] S5 performs degradation treatment on the wastewater after adsorption treatment;

[0063] S51 detects the pollution concentration of wastewater after adsorption treatment;

[0064] Specifically, the pollution concentration of the wastewater after adsorption treatment is tested to understand the residual pollutants in the wastewater.

[0065] S52 selects a corresponding degradation method to perform degradation treatment on the wastewater based on the concentration detection data.

[0066] Specifically, based on the concentration detection data, a suitable degradation treatment method is selected. For wastewater with a high organic content, a biodegradation method can be selected, including an activated sludge method, a biofilm method, etc.; for wastewater with a high content of difficult-to-degrade organic or inorganic matter, a chemical oxidation method can be selected, including ozone oxidation and Fenton reagent oxidation.

[0067] S6 disinfects the degraded wastewater before discharging it.

[0068] Specifically, choose the corresponding disinfection method, such as chlorine disinfection, ultraviolet disinfection, ozone disinfection, etc., to kill pathogenic microorganisms and viruses in the wastewater; before the wastewater is discharged, conduct water quality monitoring to ensure that the various indicators in the wastewater meet the environmental protection discharge standards. If the wastewater quality does not meet the standards, further treatment measures need to be taken until the wastewater quality meets the discharge standards.

[0069] See also Figure 7 In the second aspect, a multi-stage sedimentation tank is used for the multi-stage sedimentation tank wastewater treatment process described in the first aspect, comprising a sedimentation tank 1, a primary sedimentation tank 2 and a secondary sedimentation tank 3.

[0070] In this embodiment, wastewater can be treated in multiple stages through the sedimentation tank 1, the primary sedimentation tank 2 and the secondary sedimentation tank 3, thereby effectively improving the treatment efficiency of wastewater.

[0071] The multi-stage sedimentation tank and wastewater treatment process provided by the present invention have the following beneficial effects:

[0072] 1. The multi-stage sedimentation tank and wastewater treatment process provided by the present invention significantly improve the treatment efficiency: through the multi-stage sedimentation design, each stage of the sedimentation tank can specifically remove suspended solids and dissolved organic matter of different sizes and types, thereby improving the overall treatment efficiency. Compared with a single sedimentation tank, a multi-stage sedimentation tank can reduce the concentration of pollutants in wastewater more quickly and effectively.

[0073] 2. The multi-stage sedimentation tank and wastewater treatment process provided by the present invention improve the quality of wastewater treatment and ensure that the discharge meets the standards: the multi-stage sedimentation tank combines multiple treatment methods such as coagulation, sedimentation, filtration, adsorption and degradation to form a complete wastewater treatment chain. This comprehensive treatment method can more comprehensively remove pollutants in wastewater and ensure that the discharge concentration of wastewater after treatment meets environmental protection standards.

[0074] 3. The multi-stage sedimentation tank and wastewater treatment process provided by the present invention realize the effective extraction and utilization of raw materials: In the treatment process of the multi-stage sedimentation tank, through reasonable process design and parameter adjustment, the effective extraction of raw materials (such as some valuable metal ions, organic matter, etc.) in the wastewater can be achieved. This not only helps the recycling of resources, but also reduces the treatment cost.

[0075] 4. The multi-stage sedimentation tank and wastewater treatment process provided by the present invention enhance the flexibility and adaptability of wastewater treatment: the new multi-stage sedimentation tank wastewater treatment process can be flexibly adjusted according to the specific composition and concentration of the wastewater. For example, by changing the type and dosage of coagulant, adjusting parameters such as sedimentation time and filtration speed, effective treatment of different types of wastewater can be achieved.

[0076] 5. The multi-stage sedimentation tank and wastewater treatment process provided by the present invention meet environmental protection requirements and promote sustainable development: By improving the efficiency and quality of wastewater treatment, the new multi-stage sedimentation tank wastewater treatment process helps to reduce environmental pollution and protect water resources. At the same time, the process also promotes the recycling and sustainable development of resources, which is in line with the current development trend of environmental protection and energy conservation.

[0077] The above disclosure is only a preferred embodiment of a multi-stage sedimentation tank and a wastewater treatment process of the present invention. Of course, this cannot be used to limit the scope of the claims of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A multi-stage sedimentation tank wastewater treatment process, characterized in that: The following steps are involved: Pre-treat large particles and suspended solids in wastewater; The pretreated wastewater is introduced into a multi-stage sedimentation tank for treatment; Perform preliminary filtration of the treated wastewater through filters; placing the adsorbent into the preliminarily filtered wastewater for adsorption treatment; Degrading the wastewater after adsorption treatment; The degraded wastewater is disinfected before discharge.

2. The multi-stage sedimentation tank wastewater treatment process according to claim 1, characterized in that: In "Pretreatment of Large Particles and Suspended Solids in Wastewater", it includes: The wastewater passes through the screen equipment to intercept and remove large particles in the wastewater; The removed wastewater is introduced into the grit chamber to settle the suspended matter to the bottom through sedimentation.

3. The multi-stage sedimentation tank wastewater treatment process according to claim 1, characterized in that: In "introducing the pre-treated wastewater into a multi-stage sedimentation tank for treatment", the following steps are included: The pretreated wastewater is introduced into the primary sedimentation tank and a coagulant is added for primary sedimentation; The settled wastewater is introduced into the secondary sedimentation tank and a coagulant is added thereto for secondary sedimentation.

4. The multi-stage sedimentation tank wastewater treatment process according to claim 1, characterized in that: In "preliminary filtration of treated wastewater by filters", the following steps are included: introducing treated wastewater into the filter; The wastewater is initially purified by the filter material filled inside the filter.

5. The multi-stage sedimentation tank wastewater treatment process according to claim 1, characterized in that: In "putting the adsorbent into the wastewater after preliminary filtration for adsorption treatment", the following steps are included: Sampling and testing the wastewater after preliminary filtration to obtain pollutant analysis data; Selecting a corresponding adsorbent based on the pollutant analysis data; The adsorbent is introduced into the wastewater for adsorption treatment.

6. The multi-stage sedimentation tank wastewater treatment process according to claim 1, characterized in that: In "degradation treatment of wastewater after adsorption treatment", the following steps are included: Conduct pollution concentration test on wastewater after adsorption treatment; Based on the concentration detection data, a corresponding degradation method is selected to perform degradation treatment on the wastewater.

7. A multi-stage sedimentation tank, used in the multi-stage sedimentation tank wastewater treatment process according to any one of claims 1 to 6, characterized in that: It comprises a sedimentation tank, a primary sedimentation tank and a secondary sedimentation tank, and the sedimentation tank, the primary sedimentation tank and the secondary sedimentation tank are connected in sequence.

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