CN211111411U - High concentration phosphorus-containing wastewater treatment system of phenolic resin enterprise - Google Patents
High concentration phosphorus-containing wastewater treatment system of phenolic resin enterprise Download PDFInfo
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Abstract
The utility model discloses a high-concentration phosphorus-containing wastewater treatment system for phenolic resin enterprises, which comprises a precipitation reactor and a vacuum dehydrator, wherein the vacuum dehydrator is connected with the precipitation reactor through a delivery pump, and the precipitation reactor is also connected with a subsequent biochemical treatment system; the sedimentation reactor is used for wastewater treatment, the vacuum dehydrator is used for solid-liquid separation of the sediment that the sedimentation reactor produced, the vacuum dehydrator with still be equipped with filtrating reflux unit between the sedimentation reactor, be used for making the filtrating that the vacuum dehydrator obtained flows back to the sedimentation reactor. The utility model discloses a processing system, the precipitate that produces in the reactor is handled through vacuum dehydration machine immediately, has avoided freezing the technical problem of cauldron, and has simplified processing system, the management of being convenient for.
Description
Technical Field
The utility model relates to a waste water treatment technical field, in particular to high concentration phosphorus-containing wastewater treatment of phenolic resin enterprise.
Background
The method is characterized in that high-concentration phosphorus-containing organic wastewater is generated in the production process of phenolic resin, the content of sodium phosphate can reach 30-35 percent, and COD is about 6 mg/L, a biological method is adopted to treat the high-salt organic wastewater, the salt content is required, the biological method is not practical after dilution for the high-salt organic wastewater, a direct incineration mode is adopted to treat the high-salt organic wastewater, the calorific value of the wastewater is required to be evaluated, and a unit with corresponding qualification is required to treat the high-salt organic wastewater, the COD is as high as 6 mg/L, an evaporation concentration-cooling crystallization process is not suitable, although the evaporation-thermal crystallization process is suitable for treating the high-COD and high-salt wastewater, the type of soluble salt is not specially required, the salt content is higher, the separation efficiency is higher, but the deep treatment and the recycling of salt mud or salt slag generated by thermal crystallization are difficult, and the evaporation-investment thermal crystallization process is not only high in cost and operation cost (the evaporation cost is about 200 yuan/m)3) And the resulting salt sludge may still be disposed of as hazardous waste. In addition to the above methods, there is a chemical precipitation method in which phosphorus is removed by converting phosphate into insoluble phosphate precipitate by reaction with iron, aluminum or calcium salt, which produces a large amount of chemical sludge, and the sludge needs to be treated secondarily by incineration or the like and is difficult to be recycled.
The aged landfill leachate has the outstanding characteristics that the ammonia nitrogen concentration is high and reaches thousands of mg/L, the excessively high ammonia nitrogen concentration causes the C/N to be too low, the carbon source required by biological denitrification is seriously insufficient, the conventional biological treatment is inhibited to a certain extent, and the difficulty of biochemical treatment of the leachate is increasedThe main reason that the total nitrogen removal rate is not high in the landfill leachate treatment process. By magnesium ammonium phosphate process (Mg)2++PO4 3-+NH4++6H2O→MgNH4PO4·6H2O↓，MgNH4PO4·6H2O abbreviated as MAP) for the pretreatment of aged landfill leachate, the denitrification efficiency is high, the process is simpler, the formed precipitate can be recycled as slow-release fertilizer, but the dosage of the precipitant is larger and the cost is high.
A traditional treatment system for phosphorus-containing wastewater generally comprises a sedimentation tank and a flocculation tank which are combined, wherein a medicament is added into the sedimentation tank for sedimentation treatment, the treated wastewater is discharged into the flocculation tank, a flocculating agent is added into the flocculation tank for strengthening sedimentation, the wastewater is discharged into a secondary sedimentation tank for realizing solid-liquid separation, and then a filter press is used for dewatering. The system for treating sewage by combining the multi-stage tanks has large occupied space of the device, complex system and increased cost; the treatment method adopts a precipitation mode to separate the salt mud, so that the precipitation effect is poor, and time and labor are wasted.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-concentration phosphorus-containing wastewater treatment system for phenolic resin enterprises, which can solve the problems in the prior art,
the technical scheme of the utility model as follows:
a high-concentration phosphorus-containing wastewater treatment system for phenolic resin enterprises comprises a precipitation reactor and a vacuum dehydrator, wherein the vacuum dehydrator is connected with the precipitation reactor through a delivery pump, and the precipitation reactor is connected with a subsequent biochemical treatment system; the vacuum dewatering device is used for carrying out solid-liquid separation on the precipitate generated by the precipitation reactor, and a filtrate reflux device is arranged between the vacuum dewatering device and the precipitation reactor and is used for refluxing the filtrate obtained by the vacuum dewatering device to the precipitation reactor; the sludge collecting device is used for collecting sludge generated by the vacuum dehydrator; and a filtrate conveying device is arranged between the precipitation reactor and the subsequent biochemical treatment system and is used for discharging the residual filtrate in the precipitation reactor to the subsequent biochemical treatment system.
The high-concentration phosphorus-containing wastewater generated in the production process of a phenolic resin enterprise is treated by a vacuum dehydrator, so that the problem of kettle freezing is avoided, the precipitation generated in a precipitation reactor is discharged to a vacuum dehydrator for dehydration while reaction, solid-liquid separation is carried out in time, and the technical problems of frequent plate removal and mud removal and pipeline blockage of the traditional filter press are solved by treating the precipitation through the vacuum dehydrator.
Preferably, a stirring device and/or a pH detection device are/is arranged in the precipitation reactor.
Preferably, the number of the vacuum dewaterers is at least two, and the vacuum dewaterers are respectively connected with the precipitation reactor through a conveying pump. Because the speed of sediment generated by the sediment reactor is high, the processing speed of one vacuum dehydrator is low, and engineering accidents are easy to occur, and the engineering safety is ensured by adopting at least two vacuum dehydrators.
Preferably, the precipitation reactor is further connected with a filtrate tank, the residual filtrate in the precipitation reactor is conveyed to the filtrate tank through an evacuation pump, and the filtrate in the filtrate tank is conveyed to a sewage biochemical treatment system through a filtrate lifting pump.
Preferably, the precipitation reactor is provided with a medicament adding device for adding magnesium oxide for adjusting the pH value and magnesium sulfate as a precipitator.
Preferably, the remaining filtrate in the precipitation reactor, the filtrate in the filtrate tank, is transported by a pump.
Compared with the prior art, the beneficial effects of the utility model are as follows:
firstly, the utility model relates to a high-concentration phosphorus-containing wastewater treatment system for phenolic resin enterprises, which is based on the analysis of the water quality characteristics and denitrification technology of old landfill leachate, and takes the high-phosphorus wastewater in the production process of the phenolic resin enterprises as a raw material for producing magnesium phosphate salts; the magnesium phosphate obtained by the treatment system can be used for treating old garbage leachate, and a high-efficiency and low-price nitrogen removal agent is found for the pretreatment of the old garbage leachate; compared with the traditional wastewater treatment system, the treatment system of the utility model avoids adding flocculating settling agent after reaction to strengthen the settling effect, thereby avoiding the technical problems of the need of combining a flocculating tank and a sedimentation tank and complicated treatment process; the utility model discloses a processing system adopts the vacuum dehydration machine to carry out sedimentation treatment, and while reaction solid-liquid separation has simplified process flow, the system operation management of being convenient for.
Secondly, the high-concentration phosphorus-containing wastewater treatment system of the phenolic resin enterprise of the utility model can rapidly generate precipitate in the dosing reaction process, and the generated precipitate is immediately discharged to a vacuum dehydrator for treatment, thereby avoiding the technical problem of kettle freezing; adopt the vacuum dehydration machine to carry out solid-liquid separation, mud is carried while dehydrating, when having avoided traditional pressure filter to handle, and the rear end can't be carried to the tight mud cake layer, needs often to tear the board and unloads mud, and the pipeline also can be blockked up technical problem.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention;
fig. 2 is a schematic flow chart of embodiment 1 of the present invention.
Detailed Description
The utility model discloses a processing object is the high phosphorus waste liquid in the production process of phenolic resin enterprise, phosphorus in the waste liquid exists with the form of sodium phosphate, the content of sodium phosphate reaches 30% ~ 35%, sodium phosphate content doubles in the waste liquid after the concentration even, reach 60% ~ 70%, the total phosphorus concentration that corresponds is close to 20 ten thousand mg/L. the existence form of sodium phosphate in the waste water receives pH to influence, the existence form of sodium phosphate is different, the precipitate that obtains is also different, consequently, in order to obtain specific precipitate, the control of reaction process pH is especially critical, pH control is improper just can not obtain anticipated product.
The utility model adopts a step-by-step precipitation method, the pH value of the wastewater is adjusted to 6-7 in the first step, and the dihydric phosphate in the wastewater is converted into the hydrogen phosphate, so that the hydrogen phosphate reacts with the magnesium sulfate added subsequently to generate magnesium hydrogen phosphate precipitate, and solid-liquid separation is carried out; and secondly, adjusting the pH value to 8-10.5, adding magnesium sulfate to generate magnesium phosphate precipitate, and performing solid-liquid separation, wherein phosphorus in the wastewater mainly exists in the forms of hydrogen phosphate and phosphate. Through fractional precipitation, the phosphorus in the waste liquid is finally reduced to the range that can be accepted by a subsequent biochemical treatment system as a phosphate fertilizer.
The utility model discloses based on the analysis to old landfill leachate's quality of water characteristics and denitrogenation technique, carry out resource utilization with the high phosphorus waste water in the production process of phenolic resin enterprise as a raw materials of production magnesium phosphate salt, and magnesium phosphate salt can further be as the high-efficient denitrifier among high ammonia nitrogen wastewater treatment process such as landfill leachate. Thus, the method is feasible for phenolic resin manufacturers in terms of both technology and marketing of magnesium phosphate.
The utility model discloses adopt magnesium sulfate as the precipitant simultaneously, and do not select other precipitants such as calcium salt, this is because the utility model discloses a phosphorus in the phosphorus-containing waste water exists with the form of phosphoric acid sodium salt, just the utility model discloses regard this thigh high phosphorus waste water as a raw materials of production magnesium phosphate salt. Because of the existence of phosphorus and the special purpose of treatment, the magnesium sulfate is adopted as the precipitant.
In the wastewater treatment process of the utility model, the solid-liquid separation is also very important. Because the concentration of sodium phosphate in the wastewater is very high, precipitation is rapidly generated in the dosing reaction process, and the problem of kettle freezing can occur if solid-liquid separation is not performed in time. In addition, the generated precipitate has good dehydration performance, and reasonable dehydration equipment needs to be selected. The utility model discloses a waste water treatment method, the design is reacted simultaneously and is dewatered, is different from traditional reaction after earlier deposit the mode of dehydration again, adopts the vacuum dehydration machine in addition, and need not the pressure filter.
The dewatering equipment who commonly uses is plate frame or diaphragm filter press, is fit for being used for the relatively poor material of dehydration nature, like biological mud, the utility model discloses the sediment that produces among the processing method is magnesium phosphate salt, is materialization mud, and its dehydration nature is good, if dewaters rapidly at the equipment front end with the pressure filter material, produces fine and close mud cake layer, will lead to the material can't carry the rear end, needs often to dismantle the board mud, and the pipeline also can be blockked up. The vacuum dehydrator is adopted, so that the problem cannot be caused, the materials on the vacuum dehydrator are dehydrated on the transmission belt, filtrate can be sucked into the separation tank under the vacuum effect, the materials are conveyed while being dehydrated along with the rolling of the rotating belt, and the water content of the finally dehydrated materials is about 40-60%.
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. In practical applications, the improvement and adjustment made by those skilled in the art according to the present invention still belong to the protection scope of the present invention.
Example 1
The embodiment provides a high concentration phosphorus wastewater treatment system of phenolic resin enterprise, including precipitation reactor 1, filtrating jar 2, vacuum dehydration machine 3, conveyer 5 and adsorption reactor 6. The precipitation reactor 1 is connected with a vacuum dehydrator 3 through a delivery pump, the precipitation reactor 1 is a high-concentration phosphorus-containing wastewater processor, the adsorption reactor 2 is an old garbage leachate processor, and the precipitation reactor 1 is provided with a dosing device, a pH detection device and a stirring device.
In order to ensure that the generated precipitate can be processed in time, the precipitation reactor is also connected with a second vacuum dehydrator so as to ensure the engineering safety and improve the processing efficiency of the precipitate.
The embodiment provides a method for treating high-concentration phosphorus-containing wastewater of phenolic resin enterprises, the high-concentration phosphorus-containing wastewater is pumped into a precipitation reactor, magnesium oxide is added to adjust the pH value to 6-7, magnesium sulfate is continuously added, most of phosphorus in the wastewater is fixed in magnesium hydrogen phosphate precipitation, the precipitation reactor is continuously stirred, meanwhile, a valve of a delivery pump is opened, the generated precipitation is delivered to a vacuum dehydrator through the delivery pump, filtrate flows back to the precipitation reactor, and filter-pressed sludge enters a conveyor.
And after the magnesium sulfate is added, closing the valve of the delivery pump. And continuously adding magnesium oxide into the precipitation reactor to adjust the pH value to 8-10.5, and continuously adding magnesium phosphate to convert phosphorus in the reaction liquid into magnesium phosphate so as to reduce the phosphorus concentration in the final residual liquid, so that the phosphorus can be accepted by a subsequent biochemical treatment system as a phosphate fertilizer. The precipitation reactor continuously stirs, simultaneously opens the delivery pump valve, and the sediment is carried to second vacuum dehydration machine 4 through the delivery pump, and the filtrating backward flow is to precipitation reactor, and filter-pressing mud gets into the conveyer.
And conveying the residual filtrate in the precipitation reactor to a filtrate tank through an emptying pump, and conveying the filtrate serving as nutrient solution to a sewage biochemical treatment system by using a filtrate lifting pump. And transporting the materialized sludge collected by the conveyor to a landfill for removing ammonia nitrogen in the aged landfill leachate. And respectively adding the aged landfill leachate and magnesium phosphate of the materialized sludge into an adsorption reactor, after the reaction is finished, feeding the residual waste liquid into a subsequent landfill leachate biochemical treatment system, and using a deposition product which is struvite as a fertilizer.
In the embodiment, magnesium oxide is added in batches, the pH value in a precipitation reactor is controlled to be 6-7 for the first time, and magnesium sulfate is added and stirred to obtain magnesium hydrogen phosphate precipitate; and controlling the pH value to be 8-10.5 for the second time, adding magnesium sulfate, and stirring to obtain magnesium phosphate precipitate. And after the precipitate is generated, the precipitate is timely discharged to a vacuum dehydrator for dehydration treatment, and solid-liquid separation and dehydration treatment are carried out while reaction is carried out, so that the problem of kettle freezing is avoided. Simultaneously, the vacuum dewatering machine is used for dewatering, sludge on the vacuum dewatering machine is dewatered on the transmission belt, filtrate is sucked into the separation tank under the vacuum effect, the sludge is conveyed while being dewatered along with the transmission of the transmission belt, and the water content of the finally dewatered sludge is about 40-60%. The problem that the conventional filter press needs to frequently disassemble plates to disassemble mud is solved, and the technical problem of pipeline blockage is solved.
The main components of the sludge collected by the embodiment are magnesium hydrogen phosphate and magnesium phosphate, and the sludge can be used as a high-efficiency nitrogen removing agent for high ammonia nitrogen wastewater such as aged landfill leachate, so that the environment-economic win-win effect of resource utilization of waste is achieved.
Under the teaching of the present invention and the above embodiments, the skilled person can foresee easily that the present invention can be realized by the listed or exemplified raw materials or equivalent substitutes thereof, processing methods or equivalent substitutes thereof, and the upper and lower limit values and interval values of the parameters of the raw materials and the processing methods can be realized by the present invention, and the embodiments are not listed here one by one.
Claims (6)
1. The high-concentration phosphorus-containing wastewater treatment system of the phenolic resin enterprise is characterized by comprising a precipitation reactor and a vacuum dehydrator, wherein the vacuum dehydrator is connected with the precipitation reactor through a delivery pump, and the precipitation reactor is also connected with a subsequent biochemical treatment system; the vacuum dewatering device is used for filtering the solid and liquid in the precipitation reactor, and is used for filtering the solid and liquid in the precipitation reactor; the sludge collecting device is used for collecting sludge generated by the vacuum dehydrator; and a filtrate conveying device is arranged between the precipitation reactor and the subsequent biochemical treatment system and is used for discharging the residual filtrate in the precipitation reactor to the subsequent biochemical treatment system.
2. The phenolic resin enterprise high-concentration phosphorus-containing wastewater treatment system as claimed in claim 1, wherein a stirring device and/or a pH detection device is/are arranged in the precipitation reactor.
3. The high-concentration phosphorus-containing wastewater treatment system of the phenolic resin enterprise as claimed in claim 1, wherein the number of the vacuum dewaterers is at least two, and the vacuum dewaterers are respectively connected with the precipitation reactor through a conveying pump.
4. The high-concentration phosphorus-containing wastewater treatment system of the phenolic resin enterprise as claimed in claim 1, wherein the precipitation reactor is further connected with a filtrate tank, the residual filtrate in the precipitation reactor is conveyed to the filtrate tank, and the filtrate in the filtrate tank is conveyed to a sewage biochemical treatment system.
5. The phenolic resin enterprise high-concentration phosphorus-containing wastewater treatment system as claimed in claim 1, wherein the precipitation reactor is provided with a medicament adding device for adding magnesium oxide for adjusting the pH value and magnesium sulfate as a precipitator.
6. The phenolic resin enterprise high-concentration phosphorus-containing wastewater treatment system as claimed in claim 4, wherein the residual filtrate in the precipitation reactor and the filtrate in the filtrate tank are conveyed by a pump.
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| CN110759514A (en) * | 2019-08-16 | 2020-02-07 | 上海世渊环保科技有限公司 | High-concentration phosphorus-containing wastewater treatment method and treatment system for phenolic resin enterprises |
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