CN111620417A - Device and method for deeply removing phosphorus from sewage - Google Patents
Device and method for deeply removing phosphorus from sewage Download PDFInfo
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- CN111620417A CN111620417A CN202010317015.6A CN202010317015A CN111620417A CN 111620417 A CN111620417 A CN 111620417A CN 202010317015 A CN202010317015 A CN 202010317015A CN 111620417 A CN111620417 A CN 111620417A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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Abstract
The invention discloses a device and a method for deeply removing phosphorus from sewage, which comprises a reciprocating type clapboard flocculation tank, wherein the reciprocating type clapboard flocculation tank is provided with a first water inlet and a first water outlet, a circulation path is formed between the first water inlet and the first water outlet by the reciprocating type clapboard flocculation tank, a quick reaction area and a slow reaction area are formed by controlling different hydraulic conditions of galleries by the reciprocating type clapboard flocculation tank, the quick reaction area and the slow reaction area are distributed along the direction from the first water inlet to the first water outlet, and a drain port is arranged at the bottom of the reciprocating type clapboard flocculation tank; the sectional type flocculating agent adding device is distributed in a plurality of galleries of the rapid reaction area along the direction from the first water inlet to the first water outlet; and the solid-liquid separation device is provided with a second water inlet and a second water outlet, and the second water inlet is connected with the first water outlet. The method adopts a sectional flocculating agent adding mode, can increase the contact time of the flocculating agent and the phosphorus under the same condition, improve the reaction rate and improve the defect of incomplete medicament reaction.
Description
Technical Field
The invention is used in the field of sewage treatment, and particularly relates to a device and a method for deep phosphorus removal of sewage.
Background
In recent years, with the increasing of the urbanization scale of rural areas in China, the urban population density is higher and higher along with the development of modernization. Meanwhile, along with the improvement of living standard of people, a large amount of phosphorus-containing domestic sewage is generated. Leading excessive nutrient substances to enter the water body, thereby causing the abnormal propagation of algae and aquatic plants in the water body, namely the eutrophication of the water body. The discharge amount of sewage is increased in geometric times along with the increase of population in cities, and the total discharge amount, especially the total amount of nutrient-rich substances of nitrogen and phosphorus far exceeds the self-cleaning capacity of the environment even if the pollutants in the sewage are better treated and controlled by the existing sewage treatment plants. Therefore, the corresponding domestic sewage discharge standard requirements are higher and higher, and further deep phosphorus removal is urgent. Therefore, the research on the deep and efficient dephosphorization technology of the domestic sewage has great practical significance.
The research and application of the phosphorus removal technology have been in history for many years, and the existing sewage phosphorus removal processes at home and abroad mainly comprise two types of biological phosphorus removal and chemical phosphorus removal. At present, biological phosphorus removal is mainly used in sewage treatment plants, but the effluent TP is unstable due to the influence of factors such as the concentration of Total Phosphorus (TP) in the influent water, the environment, the management and the like, and the related process requirements of upgrading and reconstruction cannot be met. Especially when the effluent standard is improved to first grade A, the emission standard is difficult to reach by only relying on biological phosphorus removal. In order to remove pollutants which cannot be effectively and stably removed in biological phosphorus removal, chemical phosphorus removal assistance is usually added. Most of the chemical phosphorus removal methods are methods of adding chemical agents, but in the prior art, the contact time of the chemical agents and pollutants is limited, and incomplete reaction is easy to occur. Moreover, the chemical agent is less efficiently utilized.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art and provides a device and a method for deeply removing phosphorus from sewage.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, an apparatus for deep phosphorus removal from wastewater comprises
The reciprocating type clapboard flocculation tank is provided with a first water inlet and a first water outlet, a circulation path is formed between the first water inlet and the first water outlet, a fast reaction area and a slow reaction area are formed by controlling hydraulic conditions of different galleries in the reciprocating type clapboard flocculation tank, and the fast reaction area and the slow reaction area are sequentially distributed along the direction from the first water inlet to the first water outlet;
the sectional type flocculating agent adding device is distributed in a plurality of galleries of the rapid reaction area along the direction from the first water inlet to the first water outlet;
and the solid-liquid separation device is provided with a second water inlet and a second water outlet, and the second water inlet is connected with the first water outlet.
With reference to the first aspect, in certain implementations of the first aspect, the method further includes
The sludge return pipeline, one end with solid-liquid separation equipment connects, the other end with the flocculation basin is connected, be equipped with the sludge reflux pump on the sludge return pipeline, will deposit the floc and flow back to reciprocating type baffle flocculation basin front end.
With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, the method further includes
The water inlet phosphorus monitor is arranged at the first water inlet;
the water outlet phosphorus monitor is arranged at the first water outlet;
and the water inlet phosphorus monitor, the water outlet phosphorus monitor, the sludge reflux pump and the sectional type flocculating agent adding device are connected with the PLC on-line monitoring and feedback system.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the reciprocating type partition plate flocculation tank controls different gallery hydraulic conditions by controlling the spacing of partition plates to form a fast reaction zone and a slow reaction zone, and the spacing of the partition plates in the fast reaction zone is smaller than the spacing of the partition plates in the slow reaction zone.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the partition plate includes a first partition plate closest to the first water inlet, the reciprocating type partition plate flocculation tank forms a first section of dosing area on one side of the first partition plate close to the first water inlet, a second section of dosing area is formed on one side of the first partition plate far away from the first water inlet, and the sectional type flocculant dosing device includes a first section of flocculant dosing device located in the first section of dosing area and a second section of flocculant dosing device located in the second section of dosing area.
With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, the solid-liquid separation device includes a sedimentation tank, and the sedimentation tank and the flocculation tank are one tank body.
In a second aspect, a method for deep phosphorus removal from wastewater comprises the following steps:
chemical phosphorus removal reaction, namely enabling sewage to flow through a fast reaction zone and a slow reaction zone, enabling the flow rate of the sewage in the fast reaction zone to be larger than that in the slow reaction zone, and adding flocculating agents into the sewage at a plurality of agent adding points of the fast reaction zone;
solid-liquid separation, namely performing solid-liquid separation on the mud-water mixture, discharging clear liquid, and collecting sludge;
and a sludge refluxing step, wherein part of the collected sludge is refluxed to the rapid reaction zone.
With reference to the second aspect, in certain implementations of the second aspect, the phosphorus content in the wastewater flowing into the rapid reaction zone is monitored, the phosphorus content in the discharged clear liquid is monitored, and the flocculant adding amount and the sludge return flow amount of the plurality of agent adding points are adjusted according to the phosphorus content information.
In combination with the second aspect and the implementations described above, in some implementations of the second aspect,
in the solid-liquid separation step, a mud-water mixture is introduced into a sedimentation tank, the hydraulic retention time is 1-3 hours, and after standing, the mud-water solid-liquid separation is realized;
and a phosphorus content in the sewage flowing into the rapid reaction zone is monitored in real time by adopting a water inlet phosphorus monitor, the phosphorus content in the discharged clear liquid is monitored in real time by adopting a water outlet phosphorus monitor, data is transmitted to a PLC (programmable logic controller) online monitoring and feedback system, and a flocculating agent adding device at a plurality of agent adding points is controlled to adjust the adding amount of the flocculating agent.
One of the above technical solutions has at least one of the following advantages or beneficial effects: the technical scheme adopts a sectional flocculating agent adding mode, can increase the contact time of the flocculating agent and the phosphorus under the same condition, improve the reaction rate and overcome the defect of incomplete medicament reaction. The technical scheme abandons the flow that coagulant aid needs to be added in the conventional dephosphorization process, solves the problems of large dosage of medicament (dephosphorization agent), large occupied area, high sludge production and the like in the conventional process, and the water quality of the produced water is far superior to that of the produced water in the prior art. Solves the dilemma faced by the prior urban sewage deep dephosphorization technology, further improves the effluent quality of the sewage treatment process, and reduces the sewage treatment energy consumption and the treatment cost.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a process flow for deep phosphorus removal of wastewater according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for deep phosphorus removal from wastewater according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.
In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.
Referring to fig. 1 and 2, an embodiment of the invention provides a device for deep phosphorus removal of sewage, which comprises a reciprocating type partition flocculation tank 1, a solid-liquid separation device 2 and a sectional type flocculant adding device 3, wherein the reciprocating type partition flocculation tank 1 is provided with a first water inlet 11 and a first water outlet 12, the solid-liquid separation device 2 is provided with a second water inlet 21 and a second water outlet 22, the second water inlet 21 is connected with the first water outlet 12, sewage enters the device for deep phosphorus removal of sewage from the first water inlet 11, during the process, the sewage reacts with a flocculant in the reciprocating type partition flocculation tank 1 to carry out chemical phosphorus removal, solid-liquid separation is realized in the solid-liquid separation device 2, and clear liquid is discharged from the second water outlet 22 after final treatment.
Referring to fig. 1, a circulation path is formed between a first water inlet 11 and a first water outlet 12 in a reciprocating type clapboard flocculation tank 1, sewage enters the reciprocating type clapboard flocculation tank 1 from the first water inlet 11 and flows out of the reciprocating type clapboard flocculation tank 1 from the first water outlet 12, the reciprocating type clapboard flocculation tank 1 forms a fast reaction zone 13 and a slow reaction zone 14 by controlling different hydraulic conditions of galleries, namely, the reciprocating type clapboard flocculation tank 1 changes the flow rate of the sewage in the reciprocating type clapboard flocculation tank 1 by controlling different hydraulic conditions of the galleries to form a fast reaction zone 13 with a faster flow rate and a slow reaction zone 14 with a slower flow rate, and the fast reaction zone 13 and the slow reaction zone 14 are sequentially distributed along the direction from the first water inlet 11 to the first water outlet 12; the sectional type flocculating agent adding device 3 is distributed in a plurality of galleries of the rapid reaction zone 13 along the direction from the first water inlet 11 to the first water outlet 12.
Referring to fig. 1, sewage enters a reciprocating type clapboard flocculation tank 1 from a first water inlet 11, and the inlet water can be raw sewage or outlet water after organic matter removal and biological nitrogen and phosphorus removal are completed by a biochemical unit, and the latter reduces the phosphorus removal pressure of a chemical phosphorus removal unit. The flocculating agent is added into the sewage in the rapid reaction zone 13 by a plurality of flocculating agent adding devices 3, sectional dosing is carried out, and the removal of various components of phosphorus is realized by utilizing the adsorption, coagulation and precipitation functions of the flocculating agent.
The technical scheme adopts a sectional flocculating agent adding mode, can increase the contact time of the flocculating agent and the phosphorus under the same condition, improve the reaction rate and overcome the defect of incomplete medicament reaction. The technical scheme abandons the flow that coagulant aid needs to be added in the conventional dephosphorization process, solves the problems of large dosage of medicament (dephosphorization agent), large occupied area, high sludge production and the like in the conventional process, and the water quality of the produced water is far superior to that of the produced water in the prior art. Solves the dilemma faced by the prior urban sewage deep dephosphorization technology, further improves the effluent quality of the sewage treatment process, and reduces the sewage treatment energy consumption and the treatment cost.
In some embodiments, referring to fig. 1 and fig. 2, the device for deep phosphorus removal from sewage further comprises a sludge return pipe 4, one end of the sludge return pipe 4 is connected with the solid-liquid separation device 2, the other end of the sludge return pipe 4 is connected with the reciprocating type partition flocculation tank 1, and a sludge return pump 41 is arranged on the sludge return pipe 4. The method is characterized in that sludge after flocculation and precipitation of the sewage deep phosphorus removal device flows back to the front end of the sewage deep phosphorus removal device, residual flocculating agent in the returned sludge is reused, sectional addition is combined, reaction efficiency of the medicament is improved in multiple steps on the basis of fully utilizing the existing flocculating agent, and the addition amount of the medicament can be saved by 20-40%.
In some embodiments, referring to fig. 1 and fig. 2, the apparatus for deep phosphorus removal from sewage further comprises an influent phosphorus monitor 51, an effluent phosphorus monitor 52 and a PLC online monitoring and feedback system 53, wherein the influent phosphorus monitor 51 is provided at the first water inlet 11 and is used for detecting the phosphorus content in the sewage entering the reciprocating diaphragm flocculation tank 1; the effluent phosphorus monitor 52 is arranged at the first water outlet 12 and is used for detecting the phosphorus content in the clear liquid after flocculation and sedimentation. The inlet water phosphorus monitor 51, the outlet water phosphorus monitor 52, the sludge reflux pump 41 and the plurality of flocculating agent feeding devices 3 are all connected with a PLC online monitoring and feedback system 53. Namely, a phosphorus monitor is arranged at the water inlet and the water outlet, a PLC online monitoring and feedback system 53 is arranged in the middle, the PLC online monitoring and feedback system 53 is provided with a data signal input interface and a data signal output interface, and a water outlet relay, a valve controller and a signal input interface are arranged on the flocculating agent adding device 3; according to the change of the phosphorus content in the inlet and outlet water of the device for deeply removing phosphorus from sewage, the phosphorus is fed back to the flocculating agent adding device 3 through the PLC on-line monitoring and feedback system 53, so that the flocculating agent adding amount and the sludge return flow amount of the device for deeply removing phosphorus from sewage can be flexibly adjusted. Namely, the dosage of the chemical and the sludge reflux amount are adjusted by monitoring the content of phosphorus in the effluent of the biochemical section in real time on line. According to the technical scheme, the dosing amount of the two-stage flocculating agent is reasonably distributed through the real-time online monitoring system, the high-efficiency and stable phosphorus removal efficiency is realized, the dosing amount of the flocculating agent and the sludge reflux amount in the device for deeply removing phosphorus from sewage are fed back and controlled through the PLC online monitoring and feedback system 53 according to the change of the composition and the content of phosphorus in the inlet and outlet water, and the automatic flexible control of a flocculation precipitation unit is realized, so that the phosphorus removal is more efficient.
The tank bottom and the tank wall of the reciprocating type clapboard flocculation tank 1 define a flow path, the flow path of the reciprocating type clapboard flocculation tank 1 is bent and twisted, so as to increase the contact time and reaction effect of the flocculating agent and the sewage, the flow path of the reciprocating type clapboard flocculation tank 1 is designed into a bent and twisted state through the self shape of the tank wall of the reciprocating type clapboard flocculation tank 1, and the tank wall of the reciprocating type clapboard flocculation tank 1 can also be provided with a flow guide part, for example, in some embodiments, referring to fig. 1 and fig. 2, a plurality of partition boards 15 are arranged in the reciprocating type partition board flocculation tank 1, one end of each partition board 15 is connected with the tank wall of the reciprocating type partition board flocculation tank 1, the other end of each partition board 15 extends towards the opposite side, the partition boards 15 are arranged in the reciprocating type partition board flocculation tank 1 along the direction from the first water inlet 11 to the first water outlet 12, and the reciprocating type clapboard flocculation tank 1 is distributed in a staggered way, and a tortuous flow path is formed by the clapboard 15.
Further, referring to fig. 1 and 2, the reciprocating type clapboard flocculation tank 1 forms a rapid reaction zone 13 and a slow reaction zone 14 by controlling hydraulic conditions of different galleries, and the distance between the clapboards 15 in the rapid reaction zone 13 is smaller than that between the clapboards 15 in the slow reaction zone 14. The reciprocating type clapboard flocculation tank 1 controls hydraulic conditions according to different galleries to realize quick and slow reaction of flocculation.
In some embodiments, referring to fig. 1 and 2, the partition 15 includes a first partition closest to the first water inlet 11, the reciprocating partition flocculation tank 1 forms a first dosing area 16 on a side of the first partition close to the first water inlet 11, a second dosing area 17 on a side of the first partition far from the first water inlet 11, and the flocculant adding device 3 includes a first flocculant adding device located in the first dosing area and a second flocculant adding device located in the second dosing area. Namely, the first dosing point adding device is arranged at the water inlet of the reciprocating type clapboard flocculation tank 1, and the second dosing point adding device is arranged at the middle section of the quick corridor of the reciprocating type clapboard flocculation tank 1. The sectional type flocculating agent feeding device 3 reasonably distributes the feeding amount of the sectional type flocculating agent by monitoring the water quality condition of the effluent of the biochemical section in real time. By adopting a sectional flocculating agent feeding mode, the agent fed in the first stage is fully and efficiently contacted with phosphorus, the actual use efficiency and phosphorus removal efficiency of the agent are improved, and the agent fed in the second stage aims at removing residual phosphorus and ensuring that the effluent reaches the standard. Compared with a one-stage feeding mode, the method promotes the contact efficiency of the medicament and phosphorus, and reduces the use amount of the medicament; on the other hand, the dosage of the two-stage flocculating agent is reasonably distributed through a real-time online monitoring system, and the efficient and stable dephosphorization efficiency is realized.
The solid-liquid separation device 2 can adopt a filtering device, a sedimentation device, MBR and the like, for example, in the embodiment shown in FIG. 2, the solid-liquid separation device 2 comprises a sedimentation tank, the water mixture passing through the reciprocating type clapboard flocculation tank 1 is introduced into the sedimentation zone, the Hydraulic Retention Time (HRT) is controlled to be 1-3h, and after the retention, the solid-liquid separation of mud and water is realized. Wherein, sedimentation tank and reciprocating type baffle flocculation basin 1 are a cell body, and overall structure is succinct more, and the operation is more high-efficient, and the cost of manufacture is lower.
The technical solution of the present invention is further illustrated below with reference to a specific embodiment of the apparatus: during operation, pretreated urban sewage enters the reciprocating type clapboard flocculation tank 1 through the first water inlet 11, the unit comprises a first-stage flocculant adding device and a second-stage flocculant adding device, and after the inlet water phosphorus is detected by the inlet water phosphorus monitor 51, data is transmitted to the PLC online monitoring and feedback system 53 online monitoring and feedback system, and the first-stage flocculant adding device and the second-stage flocculant adding device are controlled to be started to add chemicals. At the moment, the removal of phosphorus is realized by the action of phosphate precipitates generated by the combination of polyaluminium chloride and phosphate in the flocculant of the reciprocating type clapboard flocculation tank 1; and the sludge-water mixture in the reciprocating type clapboard flocculation tank 1 enters a sedimentation tank, sludge-water separation is carried out in the sedimentation tank, wherein the sludge partially flows back to the front end of the reciprocating type clapboard flocculation tank 1 through a sludge return pipeline 4, and the sludge, the first-stage flocculant adding device and the second-stage flocculant adding device jointly act to reduce the flocculant adding amount. The supernatant in the sedimentation tank is discharged through the second water outlet 22. After the effluent water of the sedimentation tank passes through the effluent phosphorus detector 52 to detect the effluent phosphorus, data is transmitted to the PLC online monitoring and feedback system 53 online monitoring and feedback system, and whether the effluent phosphorus reaches the standard or flows back is controlled. The proportion of the dosage of the first-stage flocculant adding device to the second-stage flocculant adding device is determined by a PLC (programmable logic controller) online monitoring and feedback system 53 according to the phosphorus content of inlet water detected by a phosphorus online monitor.
Referring to fig. 2, the bottoms of the reciprocating type clapboard flocculation tank 1 and the solid-liquid separation device 2 are provided with emptying ports 5. The device is used for realizing the regular sludge discharge and the operation and maintenance of the complex clapboard flocculation tank 1 and the solid-liquid separation device 2.
Referring to fig. 1, an embodiment of the present invention provides a method for deep phosphorus removal from wastewater, including the following steps:
a chemical phosphorus removal reaction step, wherein sewage flows through a fast reaction zone 13 and a slow reaction zone 14, the flow rate of the sewage in the fast reaction zone 13 is greater than that in the slow reaction zone 14, flocculating agents are added into the sewage at a plurality of medicament adding points of the fast reaction zone 13, and the hydraulic retention time in the fast reaction zone 13 and the slow reaction zone 14 is controlled within the range of 1-3min and 10-15min respectively;
solid-liquid separation, namely performing solid-liquid separation on the mud-water mixture, discharging clear liquid, and collecting sludge;
a sludge return step of returning a part of the collected sludge to the rapid reaction zone 13.
In some embodiments, the phosphorus content of the wastewater flowing into the rapid reaction zone 13 is monitored, the phosphorus content of the discharged clear liquid is monitored, and the flocculant adding amount and the sludge return amount of a plurality of agent adding points are adjusted according to the phosphorus content information.
In some embodiments, in the solid-liquid separation step, the mud-water mixture is introduced into a sedimentation tank, the hydraulic retention time is 1-3 hours, and after standing, the mud-water solid-liquid separation is realized;
the technical scheme is that the method comprises the steps of adopting a water inlet phosphorus monitor to monitor the phosphorus content in the sewage flowing into a rapid reaction zone in real time, adopting a water outlet phosphorus monitor to monitor the phosphorus content in an externally discharged clear liquid in real time, transmitting data to a PLC (programmable logic controller) online monitoring and feedback system, and controlling a plurality of flocculant adding devices at agent adding points to adjust the adding amount of a flocculant.
The technical solution of the present invention is further described below with reference to a specific embodiment of the method:
the advanced phosphorus removal treatment is carried out on the effluent of the biochemical section of the Guangzhou urban sewage plant, and the water quality indexes of the phosphorus content of each component before treatment are as follows: total phosphorus 1.804mg/L, 0.462mg/L suspended phosphorus, 1.294mg/L soluble orthophosphate, and 0.048mg/L other soluble phosphorus. The processing is described below with reference to fig. 1 and 2.
1) A water inlet stage:
the method comprises the following steps of firstly, removing organic matters and biological nitrogen and phosphorus removal from the urban domestic sewage in a biochemical unit, and removing most of the organic matters, nitrogen and a small amount of phosphorus; in operation, the effluent of the biochemical section enters the reciprocating type clapboard flocculation tank 1 from the first water inlet 11, and simultaneously, the phosphorus content of the inlet water is monitored by the inlet water phosphorus monitor 51.
2) Sectional dosing stage:
after the effluent of the biochemical section is introduced into the flocculation-sedimentation tank reactor, controlling a flocculating agent medicament feeding device to perform sectional dosing according to the data monitored by the influent phosphorus monitor 51 in real time, respectively performing sectional dosing at a first dosing point and a second dosing point of the reciprocating type clapboard flocculation tank 1, wherein the dosing amount of the two sections is the same, and respectively feeding 100mg/L flocculating agent to uniformly mix the two sections. Controlling the hydraulic retention time of a rapid reaction area 13 of the reciprocating type clapboard flocculation tank 1 to be 3min and controlling the hydraulic retention time of a slow reaction area 14 of the reciprocating type clapboard flocculation tank 1 of the reciprocating type clapboard 15 to be 10min according to the water inlet flow; at the moment, the unit realizes continuous operation by adopting the working condition of sectional dosing, and the removal of various components of phosphorus is realized in the reciprocating type clapboard flocculation tank 1 by utilizing the adsorption, coagulation and precipitation effects of the flocculating agent.
3) A precipitation stage:
and (3) introducing the muddy water mixture after the reaction in the reciprocating type clapboard flocculation tank 1 into a sedimentation tank, and controlling the hydraulic retention time to be 1 h. The solid-liquid separation of the floc precipitation is realized.
4) Sludge backflow: and (3) returning the sediment in the sedimentation tank to the front end of a reciprocating type clapboard flocculation tank 1 through a sludge return device, and simultaneously controlling a PLC (programmable logic controller) online monitoring and feedback system 53 to feed back and control the sludge return quantity in real time according to the change of the phosphorus of the inlet water, wherein the return rate is 5-20%.
5) Draining: discharging the treated effluent.
According to the specific implementation steps, after the sewage deep phosphorus removal process system is subjected to a continuous operation test, the average concentrations of total phosphorus, soluble orthophosphate and other phosphorus in effluent of a sedimentation tank are respectively 0.048mg/L, 0.037mg/L and 0.011 mg/L; the total phosphorus removal rate reaches 97.3 percent, and the effluent quality is far better than the first-class A standard requirement of Integrated wastewater discharge Standard (GB 8978-1996).
The invention has the following advantages:
1) by adopting a sectional flocculating agent feeding mode, the agent fed in the first stage is fully and efficiently contacted with phosphorus, the actual use efficiency and phosphorus removal efficiency of the agent are improved, and the agent fed in the second stage aims at removing residual phosphorus and ensuring that the effluent reaches the standard. Compared with a one-stage feeding mode, the method promotes the contact efficiency of the medicament and phosphorus, and reduces the use amount of the medicament; on the other hand, the dosage of the two-stage flocculating agent is reasonably distributed through a real-time online monitoring system, so that the efficient and stable dephosphorization efficiency is realized;
2) the sludge after flocculation precipitation is refluxed to the front end of the dephosphorization reactor, residual flocculant in the refluxed sludge is reused, and the sectional type feeding and real-time monitoring feedback system is combined, so that the reaction efficiency of the medicament is improved in multiple steps on the basis of fully utilizing the existing flocculant, and the feeding amount of the medicament can be saved by 20-40%.
3) According to the change of the composition and the content of phosphorus in inlet and outlet water, the dosage of a flocculant and the reflux quantity of sludge added into the reciprocating type clapboard flocculation tank 1 are fed back and controlled by a PLC (programmable logic controller) online monitoring and feedback system 53, so that the automatic flexible control of a flocculation precipitation unit is realized, and the phosphorus removal is more efficient.
4) The method comprises the steps of realizing various control factors and control parameters of operation, realizing the deep phosphorus removal of the municipal sewage and simultaneously improving the effluent quality.
5) The whole-process automatic control module is adopted for operation, the control is simple and feasible, and the method has good operability for engineering application.
6) The process can be used for newly building and modifying the deep dephosphorization process of the sewage treatment plant, reduces the ton water treatment cost and the treatment energy consumption of the urban sewage plant, and improves the effluent quality of the urban sewage treatment plant.
In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (9)
1. The utility model provides a device of sewage degree of depth dephosphorization which characterized in that: comprises that
The reciprocating type clapboard flocculation tank is provided with a first water inlet and a first water outlet, a circulation path is formed between the first water inlet and the first water outlet, a fast reaction area and a slow reaction area are formed by controlling hydraulic conditions of different galleries in the reciprocating type clapboard flocculation tank, and the fast reaction area and the slow reaction area are sequentially distributed along the direction from the first water inlet to the first water outlet;
the sectional type flocculating agent adding device is distributed in a plurality of galleries of the rapid reaction area along the direction from the first water inlet to the first water outlet;
and the solid-liquid separation device is provided with a second water inlet and a second water outlet, and the second water inlet is connected with the first water outlet.
2. The device for deep phosphorus removal from sewage of claim 1, wherein: also comprises
The sludge return pipeline, one end with solid-liquid separation equipment connects, the other end with the flocculation basin is connected, be equipped with the sludge reflux pump on the sludge return pipeline, will deposit the floc and flow back to reciprocating type baffle flocculation basin front end.
3. The device for deep phosphorus removal from sewage of claim 2, wherein: also comprises
The water inlet phosphorus monitor is arranged at the first water inlet;
the water outlet phosphorus monitor is arranged at the first water outlet;
and the water inlet phosphorus monitor, the water outlet phosphorus monitor, the sludge reflux pump and the sectional type flocculating agent adding device are connected with the PLC on-line monitoring and feedback system.
4. The device for deep phosphorus removal from sewage of claim 1, wherein: the reciprocating type clapboard flocculation tank controls different gallery hydraulic conditions to form a rapid reaction area and a slow reaction area by controlling the distance between the clapboards, and the distance between the clapboards in the rapid reaction area is smaller than that between the clapboards in the slow reaction area.
5. The device for deep phosphorus removal from sewage of claim 4, wherein: the baffle includes the closest first baffle of first water inlet, reciprocating type baffle flocculation basin forms one section in one side that first baffle is close to first water inlet and throws the medicine district one side that first water inlet was kept away from to first baffle forms two sections and throws the medicine district, sectional type flocculating agent is thrown the device and is included to be located one section flocculating agent throwing device in one section and being located two sections are thrown the two sections flocculating agent of medicine district and are thrown the device.
6. The device for deep phosphorus removal from sewage of claim 1, wherein: the solid-liquid separation device comprises a sedimentation tank, and the sedimentation tank and the flocculation tank are a tank body.
7. A method for deeply removing phosphorus from sewage is characterized by comprising the following steps:
chemical phosphorus removal reaction, namely enabling sewage to flow through a fast reaction zone and a slow reaction zone, enabling the flow rate of the sewage in the fast reaction zone to be larger than that in the slow reaction zone, and adding flocculating agents into the sewage at a plurality of agent adding points of the fast reaction zone;
solid-liquid separation, namely performing solid-liquid separation on the mud-water mixture, discharging clear liquid, and collecting sludge;
and a sludge refluxing step, wherein part of the collected sludge is refluxed to the rapid reaction zone.
8. The method for deep phosphorus removal from sewage according to claim 7, wherein: monitoring the phosphorus content in the sewage flowing into the rapid reaction zone, monitoring the phosphorus content in the discharged clear liquid, and adjusting the flocculant adding amount and the sludge reflux amount of a plurality of medicament adding points according to the phosphorus content information.
9. The method for deep phosphorus removal from sewage according to claim 8, wherein:
in the solid-liquid separation step, introducing a mud-water mixture into a sedimentation tank, keeping the hydraulic retention time for 1-3 hours, and standing to realize solid-liquid separation of mud and water;
and a phosphorus content in the sewage flowing into the rapid reaction zone is monitored in real time by adopting a water inlet phosphorus monitor, the phosphorus content in the discharged clear liquid is monitored in real time by adopting a water outlet phosphorus monitor, data is transmitted to a PLC (programmable logic controller) online monitoring and feedback system, and a flocculating agent adding device at a plurality of agent adding points is controlled to adjust the adding amount of the flocculating agent.
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| CN202010317015.6A CN111620417A (en) | 2020-04-21 | 2020-04-21 | Device and method for deeply removing phosphorus from sewage |
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| CN202010317015.6A CN111620417A (en) | 2020-04-21 | 2020-04-21 | Device and method for deeply removing phosphorus from sewage |
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