Municipal sewage plant biochemical treatment system coping with high-concentration industrial inlet water

Abstract

The invention discloses a municipal sewage plant biochemical treatment system for coping with high-concentration industrial influent water, comprising: an enhanced multifunctional pretreatment tank comprising a mixed reaction tank and a settling zone, the mixed reaction tank comprising a plurality of reaction tanks operating in series and performing different physical and chemical reactions, and performing centralized physical settlement in the settling zone; the biochemical reaction tank is arranged at the rear end of the enhanced multifunctional pretreatment tank and comprises a water inlet distribution area, a water inlet adjusting tank and a biochemical reaction area, the water inlet distribution area and the water inlet adjusting tank are connected in series and arranged at the front end of the biochemical reaction area, the water inlet distribution area is used for realizing separable, combinable and quantitative distribution of industrial water and living water, and the biochemical reaction area is used for realizing quantitative distribution of the industrial water and the living water. Different operation modes of the inlet water adjusting tank are adjusted according to the inlet water quality condition. Through the combination of the reinforced multifunctional pretreatment tank and the biochemical reaction tank, the adverse effect of high-concentration industrial inlet water on the traditional municipal sewage treatment plant is effectively dealt with. The system process technical method provided by the invention is simple and easy to implement, high in operability, high in engineering practical application value and very wide in application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a biochemical treatment system for a municipal sewage plant for coping with high-concentration industrial influent. Background Art

[0002] Controlling water pollution is the foundation of a sustainable social development, and sewage treatment plants are essential infrastructure for cities. At present, there are still some contradictions and problems in the rapid development of domestic sewage treatment, such as unbalanced development in various regions, the construction of sewage collection pipe networks lagging behind the construction of sewage treatment plants, and focusing on water and neglecting mud. Among them, the problem of sewage collection pipe networks is more prominent. The pipe network is the intermediate hub connecting the sewage source and the terminal sewage treatment plant. The imperfect and incomplete construction of the pipe network will have a very large adverse impact on the design and operation of urban sewage treatment plants. In addition, the lax supervision of discharge in some areas has caused the water quality of urban sewage treatment plants to deviate from the ordinary domestic sewage quality. Sewage treatment plants are the terminal recipients of urban sewage, and must fully consider the fluctuations and changes of the front-end water inflow, especially in areas where there is obvious misconnection and discharge of industrial wastewater, which should be taken as the main consideration. For example, in the northern region where animal husbandry is the main industry, there are often industrial enterprises such as leather making and food processing. If the pipeline construction in such areas is not sound and the industrial wastewater is chaotically connected, a large amount of industrial wastewater will be collected in the municipal sewage collection pipelines, causing the concentration of domestic sewage to increase significantly, and even causing hazards of heavy metal toxic and harmful pollutants. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a municipal sewage plant biochemical treatment system for high-concentration industrial influent to address the deficiencies in the prior art.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] Provided is a municipal sewage plant biochemical treatment system for high-concentration industrial influent, which includes:

[0006] The enhanced multifunctional pretreatment tank includes a mixed reaction tank and a sedimentation zone, wherein the mixed reaction tank includes a plurality of reaction tanks operating in series for different physical and chemical reactions, and centralized physical sedimentation is performed in the sedimentation zone;

[0007] The biochemical reaction tank is arranged at the rear end of the enhanced multifunctional pretreatment tank, and includes an inlet distribution area, an inlet regulating tank and a biochemical reaction area. The inlet distribution area and the inlet regulating tank are arranged in series at the front end of the biochemical reaction area. The inlet distribution area is used to realize the separable and combined and quantitative distribution of industrial water and domestic water. The inlet regulating tank adjusts different operation modes according to the inlet water quality.

[0008] As described in the biochemical treatment system of a municipal sewage plant for coping with high-concentration industrial influent, the mixed reaction tank includes an oxidation-reduction tank, a chemical precipitation tank, a pH adjustment tank, a coagulation reaction tank and a flocculation reaction tank. The oxidation-reduction tank is used for reduction of high-valent heavy metal ions and oxidation of anions, the chemical precipitation tank is used for precipitation of harmful ions, the pH adjustment tank is used for adjustment of the pH value of raw water, and the coagulation reaction tank and the flocculation reaction tank are used for coagulation and flocculation reactions to settle various polluted mixtures at the front end.

[0009] As described in the biochemical treatment system of a municipal sewage plant for coping with high-concentration industrial influent, a control gate is provided at the water inlet end of the mixing reaction tank, and an overrunning channel is provided between the plurality of reaction tanks.

[0010] As described in the biochemical treatment system of a municipal sewage plant for coping with high-concentration industrial influent, the inlet distribution area is provided with an inlet regulating weir gate and a separation gate, and the inlet regulating weir gate controls the flow ratio of industrial water and domestic water by the height of the weir gate.

[0011] As described in the biochemical treatment system of a municipal sewage plant for high-concentration industrial influent, the influent regulating tank performs influent acid-base regulation, or chemically treats toxic and hazardous substances, or performs peak shaving and valley filling to alleviate fluctuations in influent water quality and water volume, or serves as a sewage hydrolysis and acidification pretreatment tank.

[0012] The beneficial effects of the technical solution of the present invention are:

[0013] This treatment system is achieved by strengthening the combined effect of the multifunctional pretreatment tank and the biochemical reaction tank water inlet regulating facilities. Through the combination of the multifunctional pretreatment tank and the biochemical reaction tank regulating facilities, it can effectively cope with the adverse effects of high-concentration industrial influent on traditional municipal sewage treatment plants. The process technology method provided by the patent of this invention is simple and easy to implement, has strong operability, has great practical application value in engineering, and has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure and arrangement of a preferred embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structural layout of the enhanced multifunctional pretreatment pool in a preferred embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure and layout of a biochemical reaction pool in a preferred embodiment of the present invention;

[0018] In the figure: 100, enhanced multifunctional pretreatment tank; 101, mixing reaction tank; 102, sedimentation area; 103, oxidation-reduction tank; 104, chemical sedimentation tank; 105, coagulation reaction tank; 106, flocculation reaction tank; 107, control gate; 108, override channel; 200, biochemical reaction tank; 201, water inlet distribution area; 202, water inlet regulating tank; 203, biochemical reaction area; 204, water inlet regulating weir gate; 205, separation gate. DETAILED DESCRIPTION

[0019] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0020] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0021] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0022] The sewage treatment system of the present invention is mainly used for the treatment of urban domestic sewage, which mainly responds to the adverse effects of tanning and food enterprise wastewater on municipal sewage in areas dominated by animal husbandry. The main characteristics of industrial wastewater are high concentration, COD index of industrial line inlet water is 1200mg / L, SS index is 800mg / L, and contains metal Cr 6+ Cr 3+ and anion S 2- The main treatment targets of the enhanced treatment process technology provided by the embodiment of the present invention are COD, SS, metal Cr 6 + Cr 3+ and anion S2- .

[0023] The sewage treatment plant of the present invention is divided into two main water inlet pipes according to the water inlet source, which are named "water inlet (living line)" and "water inlet (industrial line)" respectively. The "water inlet (industrial line)" is named because there are a large number of leather enterprises and alcohol food processing enterprises along the main pipe, and the situation of industrial wastewater not meeting the standards is serious. Therefore, its water quality is different from the quality of conventional urban domestic sewage. According to the water quality, the scheme of the present invention is implemented for the water inlet of the industrial line, and the attached Figure 1 A biological treatment system for a municipal sewage plant that copes with high-concentration industrial influent is shown.

[0024] See also Figure 1 , Figure 2 and Figure 3 As shown, in a preferred embodiment, the biochemical treatment system of the municipal sewage plant for high-concentration industrial influent of the present invention specifically includes an enhanced multifunctional pretreatment tank 100 and a biochemical reaction tank 200. After the industrial line wastewater is treated in the front section of the sewage plant (coarse coarse screen, fine screen and aeration grit chamber), it enters the process section of the scheme of the present invention, and the enhanced multifunctional pretreatment tank 100 is arranged at the front end of the biochemical reaction tank 200 as a pretreatment for the biological reaction.

[0025] The enhanced multifunctional pretreatment tank 100 includes a mixed reaction tank 101 and a sedimentation zone 102. The mixed reaction tank 101 includes a plurality of reaction tanks running in series for different physical and chemical reactions, and centralized physical sedimentation is performed in the sedimentation zone 102. The COD, SS, and metal Cr 6+ Cr 3+ and anion S 2- Reduce and remove targets to provide conditions for subsequent biochemical reactions.

[0026] Furthermore, the mixed reaction tank 101 includes an oxidation-reduction tank 103, a chemical precipitation tank 104, a pH adjustment tank, a coagulation reaction tank 105 and a flocculation reaction tank 106. Different chemical agents are added to each reaction tank to achieve their respective functions. The volume of the mixed reaction tank 101 is specifically calculated and tested according to the type of each reaction. In a preferred embodiment, the high-valent heavy metal ions are reduced and the anions are oxidized in the oxidation-reduction tank 103, the harmful ions are precipitated in the chemical precipitation tank 104, the pH value of the raw water is adjusted in the pH adjustment tank, and the coagulation reaction tank 105 and the flocculation reaction tank 106 are coagulated and flocculated to settle various polluted mixtures at the front end.

[0027] In the specific implementation, the redox tank 103 is a heavy metal ion reduction tank, into which ferrous chloride solution is added to reduce Cr 6+ To Cr 3+The residence time of heavy metal ion reduction pool is considered to be 6 minutes; after reduction, Cr 3+ , the precipitate is removed in the chemical precipitation tank 104, lime solution is added thereto to form chromium hydroxide precipitate, and the residence time in the chemical precipitation tank 104 is considered to be 5 minutes; conventional coagulation reaction and S are carried out in the coagulation reaction tank 105 2- The redox reaction of adding ferric chloride solution to the negative divalent S 2- Oxidized into a single substance flow precipitation, the residence time in the coagulation reaction tank 105 is considered to be 5 minutes; the coagulation flocs are matured in the flocculation reaction tank 106, and the sediments and COD, SS, etc. in the aforementioned mixed reaction tank are precipitated and removed in the sedimentation area 102.

[0028] The enhanced multifunctional pretreatment tank 100 is provided with multiple reaction tanks in consideration of the diversity of industrial wastewater types and pollutants. Urban industrial wastewater is diverse and has regional differences. In order to improve the universality of the scheme of the present invention, it is stipulated that multiple settings of the mixed reaction tank 101 in the enhanced multifunctional pretreatment tank 100 are provided in this scheme to remove different types of pollutants in industrial water. For example, in response to tanning industrial wastewater, oxidation-reduction reduces the high-valent heavy metal ions (Cr 6+ etc.), and then use precipitation to remove them; for example, to deal with negative divalent sulfur (S 2- ) If the concentration of hydrogen sulfide in the biogas from the sludge digestion part is too high, the metal precipitate precipitation method is used to remove it.

[0029] It is understandable that the mixed reaction tank 101 can be functionally adjusted and the order of reactions can be adjusted according to the quality of the influent water. The specific order is determined by the actual influent target pollutant removal requirements. The removal rate of various target pollutants can also be achieved by adjusting the amount of added reagents according to the process requirements. In the scheme of the present invention, the reaction mode of the enhanced multifunctional pretreatment tank 100 can be flexibly adjusted according to the quality of industrial water, and the order of several reactions can also be adjusted to better cope with various adverse working conditions. For example, when the influent does not contain industrial heavy metal pollutants, it can bypass the front-end redox tank 103 and directly enter the subsequent mixed flocculation sedimentation tank.

[0030] After the industrial line water passes through the enhanced multifunctional pretreatment tank 100, it enters the biochemical reaction tank 200 of the present invention, where microbial metabolism and degradation are carried out to purify the sewage. The biochemical reaction tank 200 is divided into two groups, preferably arranged symmetrically. Figure 3As shown, the biochemical reaction pool 200 includes an inlet distribution area 201, an inlet regulating pool 202 and a biochemical reaction area 203. The inlet distribution area 201 and the inlet regulating pool 202 are arranged in series at the front end of the biochemical reaction area 203, and are built as a whole. The core parts of the scheme of the present invention are the inlet distribution area 201 and the inlet regulating pool 202. The purpose of setting the inlet distribution area 201 is to adjust the "inlet water (living line)" and "inlet water (industrial line)" to cope with the extremely harmful working conditions of industrial inlet water, and to achieve the separable and combined and quantitative distribution of "inlet water (living line)" and "inlet water (industrial line)". The purpose of setting the inlet regulating pool 202 is to further adjust the water quality and water quantity of the inlet water to further strengthen the subsequent biochemical reaction, and different operation modes can be adjusted according to the inlet water quality.

[0031] like Figure 3 As shown, in a specific implementation, the water inlet distribution area 201 of the biochemical reaction pool 200 is provided with a water inlet regulating weir gate 204 and a separation gate 205, wherein the water inlet regulating weir gate 204 controls the flow ratio of the industrial line and the living line by the height of the weir gate, and quantitatively distributes the flow entering the biochemical pools on both sides.

[0032] After the inlet distribution area 201, there is an inlet regulating tank 202, which is a multifunctional tank that can flexibly adjust the operation mode according to the inlet water quality. For example, the inlet acid-base adjustment can be performed to meet the pH requirements of biological metabolism; or, the toxic and harmful substances Cr can be further treated chemically. 6+ Cr 3+ Alternatively, it can smooth out peaks and fill valleys, alleviate fluctuations in influent water quality and volume, and play a storage and regulation role; or, in response to high COD influent, it can be used as a sewage hydrolysis and acidification pretreatment tank to improve the biodegradability of sewage.

[0033] A control gate 107 is provided at the water inlet end of the mixing reaction pool 101, and an overriding channel 108 is provided between the multiple reaction pools. The water inlet start and stop control can be realized through the control gate 107 and the overriding channel 108, and the local treatment section overriding can be realized. A mixing agitator 109 is also provided in each reaction pool to facilitate mixing, and a flow hole 110 is also provided on the pool wall of some reaction pools.

[0034] In the scheme of the present invention, the three processes of physical, chemical and biological treatment are completed by combining the two methods of enhanced pretreatment and enhanced biological treatment to achieve the adverse effects of industrial water in the urban sewage treatment plant. Among them, the functional positioning of the enhanced multifunctional pretreatment tank 100 is a pretreatment facility for biochemical reactions, which mainly performs physical and chemical reactions, on the one hand, removes toxic and harmful substances in industrial wastewater, and on the other hand, serves as a pretreatment for biological treatment and provides a regulating effect; the biochemical reaction tank 200 strengthens the biological reaction through its water inlet regulation facilities to further cope with the adverse effects of industrial water.

[0035] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A biochemical treatment system for a municipal sewage plant for high-concentration industrial influent, characterized in that: include: The enhanced multifunctional pretreatment tank includes a mixed reaction tank and a sedimentation zone, wherein the mixed reaction tank includes a plurality of reaction tanks operating in series for different physical and chemical reactions, and centralized physical sedimentation is performed in the sedimentation zone; The biochemical reaction tank is arranged at the rear end of the enhanced multifunctional pretreatment tank, and includes an inlet distribution area, an inlet regulating tank and a biochemical reaction area. The inlet distribution area and the inlet regulating tank are arranged in series at the front end of the biochemical reaction area. The inlet distribution area is used to realize the separable and combined and quantitative distribution of industrial water and domestic water. The inlet regulating tank adjusts different operation modes according to the inlet water quality.

2. The biochemical treatment system for a municipal sewage plant for high-concentration industrial influent as claimed in claim 1, characterized in that: The mixed reaction tank includes an oxidation-reduction tank, a chemical precipitation tank, a pH adjustment tank, a coagulation reaction tank and a flocculation reaction tank. The oxidation-reduction tank is used to reduce high-valent heavy metal ions and oxidize anions. The chemical precipitation tank is used to precipitate harmful ions. The pH adjustment tank is used to adjust the pH value of raw water. The coagulation reaction tank and the flocculation reaction tank are used to perform coagulation and flocculation reactions to precipitate various polluted mixtures at the front end.

3. The biochemical treatment system for a municipal sewage plant for high-concentration industrial influent as claimed in claim 2, characterized in that: A control gate is arranged at the water inlet end of the mixing reaction tank, and an overrunning channel is arranged between the plurality of reaction tanks.

4. The biochemical treatment system for a municipal sewage plant for high-concentration industrial influent as claimed in claim 1, characterized in that: The water inlet distribution area is provided with a water inlet regulating weir gate and a separation gate, and the water inlet regulating weir gate controls the flow ratio of industrial water and domestic water by the height of the weir gate.

5. The biochemical treatment system for municipal sewage plant for high-concentration industrial influent as claimed in claim 1, characterized in that: The inlet regulating tank regulates the acidity and alkali of the inlet water, or chemically treats toxic and harmful substances, or smoothes out the peaks and fills the valleys to alleviate fluctuations in the inlet water quality and water volume, or serves as a sewage hydrolysis and acidification pretreatment tank.

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