CN111732271B - Decentralized and alternating type sewage treatment device and method - Google Patents
Decentralized and alternating type sewage treatment device and method Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C02F2303/16—Regeneration of sorbents, filters
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses a dispersed alternating type sewage treatment device and method, and belongs to the technical field of deep phosphorus removal. The device comprises: the resin units comprise filter elements and resin; the filter element comprises an upper filter element part and a lower filter element part which are separated by a porous baffle, the side wall of the upper filter element part is not porous, and the side wall and the bottom surface of the lower filter element part are provided with holes; resin is filled at the upper part of the filter element; the aeration unit is positioned below the filter element and used for providing upward shearing force for the filter element; the device body is used for accommodating the resin unit, the aeration unit and the sewage to be treated; after sewage to be treated enters the device body, the sewage enters resin through the lower part of the filter element and the baffle with holes for adsorption treatment, and then is discharged from the top end of the upper part of the filter element. During desorption, adopt and carry out to appointed desorption point after filtering the unit, soak the specific time in desorbent groove, 1 time water scrubber, 2 times pickling tank and 3 times water scrubber in proper order and can accomplish desorption regeneration, need not other power consumption, desorption simple and convenient.
Description
Technical Field
The invention belongs to the technical field of advanced phosphorus removal of rural domestic sewage, and particularly relates to a decentralized and alternating type sewage treatment device and method.
Background
In recent years, with the increasing of rural economic income and the change of life style in China, facilities such as sanitary wares, washing machines, baths and the like have been moved to common families, so that the domestic water consumption and sewage discharge of rural people are increased continuously. Most of the sewage is directly discharged into the environment without treatment or after simple treatment, thereby not only bringing negative influence to the water environment quality of the peripheral drainage basin, but also gradually forming threat to human health. Pollutants contained in rural domestic sewage are mainly organic matters, nitrogen and phosphorus, wherein water bodies polluted by phosphorus cause eutrophication of water bodies, and plants in the water are propagated in large quantities. In addition, during the process of algae reproduction, the algae consume a large amount of oxygen in the water, so that the oxygen supply of aquatic animals is insufficient, and the ecology of the whole water body is deteriorated. Therefore, the domestic rural water environment treatment particularly focuses on phosphorus removal.
The prior art mainly comprises the following dephosphorization techniques aiming at rural sewage: adding a medicament to remove phosphorus, carrying out biochemical treatment to remove phosphorus and the like; the dephosphorization agent consists of water, alcohol, a dendrobium leaf extract, nano titanium dioxide, chitosan, citric acid and efficient phosphorus-accumulating bacteria HJPO7, and is combined with a pre-precipitation treatment process, electrodes and a power supply are arranged in a pre-precipitation tank, the pre-precipitation tank and a water inlet of subsequent equipment, the dephosphorization capability of microorganisms is enhanced through an electric field, the dephosphorization efficiency is improved, and the phosphorus component basically forms struvite precipitate. However, when the phosphorus is removed by adding the medicament, the medicament is often required to be continuously and repeatedly added, and in the above technology, the medicament is added once again at intervals of 24 hours, so that the dosing cost is high, the field management is complex, and the treatment effect is unstable.
The device is provided with a water distribution tank, a biochemical precipitation cabinet, a chemical precipitation cabinet, a dephosphorization treatment device, a fixed bed anoxic zone and an MBBR aerobic zone, wherein the fixed bed anoxic zone consists of a plurality of anoxic cabinets and perforated aeration pipes arranged at the bottoms of the anoxic cabinets, braid-type fillers are arranged above the perforated aeration pipes, the MBBR aerobic zone consists of a plurality of aerobic cabinets and microporous aeration disks arranged at the bottoms of the aerobic cabinets, and bearing filler nets and high-performance suspended fillers are arranged above the microporous aeration disks; a plurality of anoxic cabinets and a plurality of aerobic cabinets are sequentially connected at intervals to form a multi-stage multi-section AO strengthening treatment system; the water distribution tank is connected with the external source sewage and the biochemical precipitation cabinet, and is communicated with the anoxic cabinet through a water outlet pipeline, the adjacent aerobic cabinet and the anoxic cabinet, and the aerobic cabinet and the biochemical precipitation cabinet are communicated through bottom openings, and the dephosphorization treatment device is connected with the biochemical precipitation cabinet and the chemical precipitation cabinet to carry out dephosphorization treatment. The dephosphorization treatment device comprises a mixing cabinet, a flocculation cabinet, an intermediate cabinet, a sand filter tank, a resin tank, a clear water cabinet, a coagulant solution barrel and a flocculant solution barrel, wherein the biochemical precipitation cabinet is communicated with the mixing cabinet through the upper part of a pipeline, the mixing cabinet is communicated with an opening at the bottom of the flocculation cabinet through a hole, the mixing cabinet is communicated with the coagulant solution barrel through a pipeline, the upper part of the flocculation cabinet is communicated with the bottom of a precipitation tank through an internal pipeline, the flocculation cabinet is communicated with the flocculant solution barrel through a pipeline, the chemical precipitation cabinet is communicated with the intermediate cabinet through a pipeline, the bottom of the intermediate cabinet is communicated with the water inlet of the sand filter tank through a water outlet pipe and a filtration lift pump, the water outlet of the sand filter tank is communicated with the resin tank through a pipeline, the resin tank is communicated with the clear water cabinet through a pipeline, and the clear water cabinet is respectively communicated with the sand filter tank, the coagulant solution barrel and the flocculant solution barrel through a pipeline and a backwash pump. When the dephosphorization treatment device respectively adopts the sand filtration tank and the resin tank to treat particulate matters and phosphorus in sewage, the sand filtration tank needs to be backwashed regularly, and valves needing to be operated are more, generally need personnel to watch on for a fixed period, and the configuration and the operation are more complex, the occupied area and the cost are larger, and the dephosphorization treatment device is not suitable for the treatment of rural domestic sewage.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that resin is easy to block when the existing resin dephosphorization method is applied to rural domestic sewage dephosphorization, the invention provides a dispersed alternative sewage treatment device and a method.
Further aiming at the problem that resin blockage is prevented by inhibiting the growth of a biofilm on the surface of a filter element by adding chlorine in rural sewage and the resin is possibly damaged by strong oxidation of the sewage, the step of firstly adjusting the ORP of the sewage before resin treatment is adopted, so that the growth of the biofilm and algae in the sewage can be inhibited, and the damage of the resin can be avoided.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a decentralized alternating wastewater treatment plant comprising:
the resin units comprise filter elements and resin; the filter element comprises an upper filter element part and a lower filter element part which are separated by a porous baffle, the side wall of the upper filter element part is nonporous, and the side wall and the bottom surface of the lower filter element part are provided with holes for filtering solid particles in the sewage to be treated; the resin is filled at the upper part of the filter element;
the aeration unit is positioned below the filtering element and is used for providing upward shearing force for the filtering element;
the device body is used for accommodating the resin unit, the aeration unit and the sewage to be treated;
after sewage to be treated enters the device body, the sewage enters resin through the lower part of the filter element and the porous baffle plate to be adsorbed and treated, and then is discharged from the top end of the upper part of the filter element.
Preferably, the resin unit is detachably disposed in the apparatus body. Because rural conditions are relatively poor, generally can't realize on-the-spot desorption, resin unit detachably arranges the device body in and is convenient for take out the change, can be portable, and the transportation is convenient, can carry out strange land desorption regeneration to the resin that adsorbs saturation.
Preferably, the aeration unit is provided with a plurality of aeration heads, and the aeration heads are spaced from the bottom end of the filter element at a certain distance. The aeration of the aeration unit provides upward shearing force for the lower part of the filter element, so that the filter element is not easy to be blocked by solid suspended matters, biological films and algae, and the continuous and stable operation of the device can be ensured.
Preferably, the filter element can be selected from one of a ceramic membrane tube and a non-metal filter element, but is not limited to the above; the filter element is of an external pressure type, water enters from the side wall and/or the bottom surface of the lower part of the filter element, and the middle effluent enters the resin through the perforated baffle, so that SS (suspended substances) can be effectively intercepted, and the influence of SS, algae and the like on the resin is reduced.
Preferably, the pore diameter of the lower part of the filter element ranges from 0.08 mm to 0.1 mm. The filter element is used for intercepting solid suspended matters in the sewage.
Preferably, the number of the filter elements can be automatically adjusted according to the water quantity condition, the diameter of a single filter element is preferably 100-300mm, and the height of the single filter element is preferably 500-800mm, so that the filter elements are convenient to replace and move.
Preferably, the number N of resin units is calculated using the formula:
N＝kQ/(nV) (1)
wherein Q is the amount of water, m3H; n is adsorption flow rate, BV/h; v is the amount of resin charged in the upper part of the filter cell, m3(ii) a k, correction factor.
Preferably, the adsorption flow rate n is 10-20BV/h, the resin amount V on the upper part of the filter element is 10-20L, and the correction coefficient k is 1.1-1.5.
Preferably, the adsorption amount of the resin is 1000-3000 BV.
Preferably, the apparatus is not limited to phosphorous removal, but may also be used for fluorine removal.
The invention also provides a method for removing phosphorus in sewage treatment by adopting the sewage treatment device, which comprises the following steps:
s1, adding sodium hypochlorite into the sewage, wherein the addition amount of the sodium hypochlorite is enough to keep the ORP of the sewage at 500-600mV, so that the influence of the biomembrane and the algae on the resin is prevented, and then the sewage enters the device body;
sewage in the S2 device body enters into the resin from the lower part of the filter element through the perforated baffle plate to be subjected to dephosphorization treatment;
s3, starting an aeration unit to aerate the lower part of the filter element to prevent solid suspended matters and a biological film formed on the lower part of the filter element from being blocked;
and S4 discharged water is discharged from the top end of the upper part of the filter element.
Preferably, the resin in step S2 is a phosphorous removal resin, and one of NDA-P, NDA- (PF) manufactured by south china technologies ltd.
Preferably, the aeration amount of the aeration unit is 6-9m3/(m2h)。
Preferably, the desorption filter element is lifted by a hand and then reaches a designated desorption point, a desorption agent groove (dilute sodium hydroxide solution), a 1-time washing groove, a 2-time pickling groove (dilute hydrochloric acid solution) and a 3-time washing groove are arranged at the desorption point, the filter element to be desorbed is soaked for 3 hours in the desorption agent groove and then is lifted out, the filter element is placed in the 1-time washing groove and soaked for 2 hours, then is placed in the 2-time pickling groove and soaked for 2 hours, and finally is placed in the 3-time washing groove and soaked for 2 hours, other power consumption is not needed, the desorption is simple and convenient, and then the filter element can be returned to the adsorption site for replacing other filter elements.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) aiming at the problem that resin is easy to block when the resin method is adopted to remove phosphorus from rural sewage, the modified filter element is adopted to fill resin, SS is effectively intercepted by the lower part of the filter element, the influence of SS, algae and the like on the resin is reduced, and further aiming at the problem that the filter element is easy to block due to the fact that a biological membrane grows on the surface of the filter element, aeration units are arranged at the bottom end of the lower part of the filter element at intervals, upward shearing force is provided, and the filter element is guaranteed to play a role efficiently for a long time;
(2) the invention further aims at the problem of inconvenient resin in-situ desorption, the resin unit is detachably arranged in the device body, the field desorption can not be realized generally due to poor rural conditions, and the resin unit is detachably arranged in the device body so as to be convenient for desorption and regeneration in different places aiming at the resin with saturated adsorption;
(3) the number of the needed resin units is calculated through the water quantity, the adsorption flow rate and the resin filling amount, so that the method can be suitable for different scales and different scenes, can form modular equipment, and is particularly suitable for the characteristic of rural miniaturization;
(4) according to the method for performing dispersive and alternative phosphorus removal by adopting the sewage treatment device, the growth of algae in the sewage and the growth of a biological membrane on the surface of the filter element are inhibited by adding sodium hypochlorite into the sewage, and the ORP is controlled within 500-600mV, so that the growth of the biological membrane at the lower part of the filter element can be inhibited, and the irreversible influence on a resin framework caused by the fact that the resin is in an over-oxidizing water body after chlorination for a long time can be avoided.
Drawings
FIG. 1 is a schematic view of a decentralized and alternating wastewater treatment plant according to the invention;
in the figure: 100. a resin unit; 110. filtering the cells; 111. the upper part of the filter element; 112. the lower part of the filter element; 113. a perforated baffle; 114. an aperture; 120. a resin;
200. an aeration unit; 210. an aeration head;
300. a device body;
400. a water inlet pipe; 410. and (5) adding a medicine point.
Detailed Description
It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or the two elements can be directly connected together; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or the two elements may be directly integrated. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
As used herein, the term "about" is used to provide the flexibility and inaccuracy associated with a given term, measure or value. The degree of flexibility for a particular variable can be readily determined by one skilled in the art.
Concentrations, amounts, and other numerical data may be presented herein in a range format. It is to be understood that such a range format is used merely for convenience and brevity and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of about 1 to about 4.5 should be interpreted to include not only the explicitly recited limit values of 1 to about 4.5, but also include individual numbers (such as 2, 3, 4) and sub-ranges (such as 1 to 3, 2 to 4, etc.). The same principle applies to ranges reciting only one numerical value, such as "less than about 4.5," which should be construed to include all of the aforementioned values and ranges. Moreover, such an interpretation should apply regardless of the breadth of the range or feature being described.
Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. Method + function or step + function limitations are only employed if all of the following conditions exist within the limitations of a particular claim: a) a method for or a step for is. b) The corresponding functions are explicitly described. Structures, materials, or acts that support the method + functions are explicitly recited in the description herein. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given herein.
As shown in fig. 1, the dispersed alternating sewage treatment device in the embodiment includes a resin unit 100, an aeration unit 200 and a device body 300, and specifically includes:
the resin units 100 are detachably arranged in the device body 300, are convenient to take out and replace, and can perform ex-situ desorption regeneration on the resin saturated in adsorption; wherein the resin unit comprises a filter element 110 and resin 120; the filter element 110 comprises a filter element upper part 111 and a filter element lower part 112 which are separated by a porous baffle 113, the side wall of the filter element upper part 111 is nonporous, and the side wall and the bottom surface of the filter element lower part 112 are porous 114 for filtering solid particles in the sewage to be treated; the resin 120 is filled in the upper part 111 of the filter element; the filter element 110 is of an external pressure type, water enters from the side wall and the bottom surface of the lower part 112 of the filter element, and the middle outlet water enters the resin 120 through the perforated baffle 113, so that SS (suspended solid) can be effectively intercepted, and the influence of SS, algae and the like on the resin 120 is reduced; the filter element 110 may be one selected from acid and alkali resistant ceramic membrane tubes and non-metallic filter elements, but is not limited thereto; in order to prevent blockage, the pore diameter range of the lower part 112 of the filter element is 0.08-0.1 mm; during operation, the number of the filter elements can be automatically adjusted according to the water quantity condition, the diameter of a single filter element is preferably 100-;
the aeration unit 200 is positioned below the filter element 110 and is provided with a plurality of aeration heads 210, and the aeration heads 210 are spaced from the bottom end of the filter element 110 at a certain distance and used for providing upward shearing force for the filter element 110, so that the filter element is not easily blocked by solid suspended matters, biological membranes and algae, and the continuous and stable operation of the device can be ensured;
the apparatus body 300 for accommodating the resin unit 100, the aeration unit 200, and the sewage to be treated.
After entering the device body 300, the water to be treated enters the resin through the lower part 112 of the filter element and the baffle plate 113 with holes for adsorption treatment, and then is discharged from the top end of the upper part 111 of the filter element.
The invention is further described with reference to specific examples.
Example 1
In the embodiment, the biochemically treated domestic sewage is COD50mg/L, SS20mg/L, TP3.5mg/L, pH 6-9, and the water amount of the sewage is 30m3The initial ORP of the wastewater was 5 mV/d. In order to deeply remove the total phosphorus content in the sewage, the NDA-P resin with larger pore channels is selected according to the SS concentration.
First, the number of resin units 100 suitable for the present embodiment is calculated according to the sewage amount, and the number N of resin units 100 is calculated by using the following formula:
N＝kQ/(nV) (1)
wherein Q is the amount of water, m3H; n is adsorption flow rate, BV/h; v is the upper 111 filling of the filter cellAmount of resin, m3(ii) a k, correction factor.
According to engineering experience, the adsorption flow rate n of the sewage in the embodiment is determined to be 15BV/h, and the amount of resin 120 filled in the upper part 111 of the filter element is 16.7L; the correction coefficient k was set to 1.5, and the number N of resin units 100 obtained was 8.
The method for performing the dispersed alternative phosphorus removal by adopting the sewage treatment device with 8 resin units 100 comprises the following steps:
s1, firstly, adding sodium hypochlorite into the sewage to be treated from a chemical adding point 410 of a sewage inlet pipe 400, wherein the adding amount of the sodium hypochlorite can ensure that the ORP of the sewage is kept at 500-600mV, so as to prevent the influence of the biomembrane and the algae on the resin, and then the sewage enters the device body 300;
s2 sewage in the device body 300 enters the resin 120 from the holes 114 of the lower part 112 of the filter element through the perforated baffle 113 for dephosphorization treatment; controlling the adsorption flow rate n to be 15 BV/h;
the outlet water of S4 is discharged from the top end of the upper part 111 of the filter element.
The effluent quality is COD40mg/L, SS10mg/L, TP0.4mg/L, and pH is 6-9.
When the adsorption amount of the resin unit 100 reaches 2500BV, the resin unit is detached from the apparatus body 300 and ex-situ desorbed.
During desorption, the filter element is lifted by hand and then reaches a designated desorption point, a desorption agent groove (4% sodium hydroxide solution), a 1-time washing groove, a 2-time pickling groove (4% hydrochloric acid solution) and a 3-time washing groove are arranged at the desorption point, the filter element to be desorbed is soaked in the desorption agent groove for 3 hours and then lifted, the filter element is placed in the 1-time washing groove for soaking for 2 hours, then is placed in the 2-time pickling groove for soaking for 2 hours, and finally is placed in the 3-time washing groove for soaking for 2 hours, other power consumption is not needed, desorption is simple and convenient, and then the filter element can be returned to an adsorption site for replacing other filter elements.
The regeneration rate of the resin after the desorption is 99.5 percent, and the resin unit after the desorption can be applied to the dispersed alternative sewage treatment device again to continue dephosphorization.
Example 2
The domestic sewage treated biochemically in this example has COD40mg/L, SS10mg/L, TP2mg/L, pH 6-9, and sewage water amount of 50m3The initial ORP of the wastewater was 10 mV/d. In order to deeply remove the total phosphorus content in the sewage, NDA- (PF) resin with stronger selectivity is selected because the concentration of TP in the embodiment is lower.
First, the number of resin units 100 suitable for the environment of the present embodiment is calculated according to the amount of wastewater, and the number N of resin units 100 is calculated by the following formula:
N＝kQ/(nV)(1)
wherein Q is the amount of water, m3H; n is adsorption flow rate BV/h; v is the amount of resin charged in the upper part 111 of the filter cell, m3(ii) a k, correction factor.
According to engineering experience, the adsorption flow rate n of the sewage in the embodiment is determined to be 10BV/h, and the amount of the resin 120 filled in the upper part 111 of the filter element is 20L; the correction coefficient k was set to 1.1, and the number N of resin units 100 was 12.
The method for carrying out the dispersed alternative phosphorus removal by adopting the sewage treatment device with 12 resin units 100 comprises the following steps:
s1, firstly, adding sodium hypochlorite into the sewage to be treated from a chemical adding point 410 of a sewage inlet pipe 400, wherein the adding amount of the sodium hypochlorite can ensure that the ORP of the sewage is kept at 500-600mV, so as to prevent the influence of the biomembrane and the algae on the resin, and then the sewage enters the device body 300;
s2 sewage in the device body 300 enters the resin 120 from the holes 114 of the lower part 112 of the filter element through the perforated baffle 113 for dephosphorization treatment; controlling the adsorption flow rate n to be 10 BV/h;
the outlet water of S4 is discharged from the top end of the upper part 111 of the filter element.
The effluent quality is COD36mg/L, SS5mg/L, TP0.5mg/L, and the pH value is 6-9.
When the adsorption amount of the resin unit 100 reaches 3000BV, it is detached from the apparatus body 300 and ex-situ desorbed.
The desorption is carried out under the conditions similar to those in the embodiment 1, the regeneration rate of the resin after the desorption is 99.2 percent, and the resin unit after the desorption can be applied to the dispersed alternative sewage treatment device again to continue dephosphorization.
Example 3
In the embodiment, the domestic sewage subjected to biochemical treatment has COD of 60mg/L, SS15mg/L, TP5mg/L, pH of 6-9 and sewage water volume of 60m3The initial ORP of the wastewater was 20 mV/d. To deeply remove the total phosphorus content in the wastewater, NDA-P resin was selected according to the SS concentration.
First, the number of resin units 100 suitable for the environment of the present embodiment is calculated according to the amount of wastewater, and the number N of resin units 100 is calculated by the following formula:
N＝kQ/(nV)(1)
wherein Q is the amount of water, m3H; n is adsorption flow rate, BV/h; v is the amount of resin charged in the upper part 111 of the filter cell, m3(ii) a k, correction factor.
Determining the adsorption flow rate n of the sewage to be 12BV/h according to engineering experience, wherein the amount of the resin 120 filled in the upper part 111 of the filter element is 20L; the correction coefficient k was set to 1.2, and the number N of resin units 100 was set to 13.
The method for carrying out the dispersed alternative phosphorus removal by adopting the sewage treatment device with 13 resin units 100 comprises the following steps:
s1, firstly, adding sodium hypochlorite into the sewage to be treated from a chemical adding point 410 of a sewage inlet pipe 400, wherein the adding amount of the sodium hypochlorite can ensure that the ORP of the sewage is kept at 500-600mV, so as to prevent the influence of the biomembrane and the algae on the resin, and then the sewage enters the device body 300;
s2 sewage in the device body 300 enters the resin 120 from the holes 114 of the lower part 112 of the filter element through the perforated baffle 113 for dephosphorization treatment; controlling the adsorption flow rate n to be 12 BV/h;
the outlet water of S4 is discharged from the top end of the upper part 111 of the filter element.
The effluent quality is COD50mg/L, SS5mg/L, TP0.8mg/L, and pH is 6-9.
When the adsorption amount of the resin unit 100 reaches 1900BV, it is detached from the apparatus body 300 and ex-situ desorbed.
The desorption is carried out under the condition similar to that in the embodiment 1, the regeneration rate of the resin after the desorption is 99.6 percent, and the resin unit after the desorption can be applied to the dispersed alternative sewage treatment device again to continue dephosphorization.
Comparative example 3A
Other conditions in the comparative example are basically the same as those in the example 3, and sewage with the same water quality is treated, except that:
when the aeration treatment in the step S3 is not carried out during the treatment, other conditions are not changed, and after the device is operated for about 72 hours, the holes 114 at the lower part 112 of each filter element are blocked, the resistance is increased after the blockage, the water passing amount is rapidly reduced, and the dephosphorization can not be normally carried out.
Comparative example 3B
Other conditions in the comparative example are basically the same as the scheme in the example 3, and sewage with the same water quality is treated, except that:
after sodium hypochlorite is added in S1 in the treatment step, the ORP is at 800-1000mV, after the resin is recycled for 20 times, the treatment effect of the resin is poor, the removal efficiency is reduced by about 50%, and the regeneration rate of the resin after desorption is reduced to 80%. As a result, when the ORP of the sewage treated in step S1 is too high, the resin is damaged more, the removal efficiency is lowered more and the resin regeneration rate is also lowered greatly after a plurality of cycles.
The above description is illustrative of the present invention and its embodiments, and is not to be construed as limiting, and the embodiments shown in the drawings are merely one of the embodiments of the present invention, and the actual configuration is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.
Claims (7)
1. A method for sewage treatment by adopting a dispersed and alternated sewage treatment device is characterized in that,
the decentralized alternating type sewage treatment device comprises: a number of resin units (100), the resin units (100) comprising filter elements (110) and resin (120); the filter element (110) comprises a filter element upper part (111) and a filter element lower part (112) which are separated by a porous baffle (113), the side wall of the filter element upper part (111) is nonporous, and the side wall and the bottom surface of the filter element lower part (112) are provided with holes (114) for filtering solid particles in the sewage to be treated; the resin (120) is filled in the upper part (111) of the filter element;
the aeration unit (200), the aeration unit (200) is positioned below the filter element (110) and is used for providing upward shearing force for the filter element (110);
a device body (300) for accommodating the resin unit (100), the aeration unit (200) and sewage to be treated;
after sewage to be treated enters the device body (300), the sewage enters the resin (120) through the lower part (112) of the filter element and the baffle plate (113) with holes for adsorption treatment, and then is discharged from the top end of the upper part (111) of the filter element;
the resin unit (100) is detachably disposed in the apparatus body (300);
the method for treating sewage by adopting the dispersed alternating sewage treatment device comprises the following steps:
s1, adding sodium hypochlorite into the sewage, wherein the addition amount of the sodium hypochlorite meets the requirement that the ORP of the sewage is kept at 500-600mV, and then the sewage enters the device body (300);
s2 sewage in the device body (300) enters the resin (120) from the lower part (112) of the filter element through the perforated baffle (113) for dephosphorization treatment;
s3, starting the aeration unit (200) to aerate the lower part (112) of the filter element;
s4, discharging the effluent from the top end of the upper part (111) of the filter element;
during desorption, the filter element (110) is lifted up and then reaches a designated desorption point, a desorption agent groove, a 1-time water washing groove, a 2-time pickling groove and a 3-time water washing groove are arranged at the desorption point, the filter element (110) to be desorbed is lifted up after being soaked in the desorption agent groove for a specific time, the filter element is placed in the 1-time water washing groove for soaking for a specific time, then placed in the 2-time pickling groove for soaking for a specific time, and finally placed in the 3-time water washing groove for soaking for a specific time, so that desorption regeneration is completed.
2. The method for sewage treatment using a decentralized and alternating sewage treatment plant according to claim 1, wherein said aeration unit (200) has a plurality of aeration heads (210), said aeration heads (210) being spaced apart from the bottom end of said filter element (110).
3. The method for wastewater treatment with a decentralized and alternating wastewater treatment plant according to claim 1, wherein the filter element (110) is selected from one of non-metallic filter elements; the filter element (110) is of an external pressure type, water enters from the side wall and/or the bottom surface of the lower part (112) of the filter element, and water from the middle enters resin through a perforated baffle (113); the pore diameter range of the lower part (112) of the filter element is 0.08-0.1 mm.
4. The method for sewage treatment using a decentralized and alternating sewage treatment plant according to claim 3, wherein the number N of resin units (100) is calculated using the following formula:
N=kQ/(nV) （1）
wherein Q is the amount of water, m3H; n is adsorption flow rate, BV/h; v is the amount of resin charged in the upper part (111) of the filter cell, m3(ii) a k, correction factor.
5. The method according to claim 4, wherein the adsorption flow rate n is 10-20BV/h, the resin amount V charged to the upper part (111) of the filter element is 10-20L, and the correction factor k is 1.1-1.5.
6. The method of claim 1, wherein the apparatus is used for phosphorus and fluorine removal.
7. The method for sewage treatment using a decentralized and alternating sewage treatment plant according to claim 6, wherein the aeration rate of the aeration unit (200) is 6-9m3/(m2h)。
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