CN112209561B - Wastewater softening treatment device and method - Google Patents
Wastewater softening treatment device and method Download PDFInfo
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- CN112209561B CN112209561B CN201910631345.XA CN201910631345A CN112209561B CN 112209561 B CN112209561 B CN 112209561B CN 201910631345 A CN201910631345 A CN 201910631345A CN 112209561 B CN112209561 B CN 112209561B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000010802 sludge Substances 0.000 claims abstract description 59
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 238000010992 reflux Methods 0.000 claims abstract description 22
- 238000005189 flocculation Methods 0.000 claims abstract description 21
- 230000016615 flocculation Effects 0.000 claims abstract description 21
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 238000005352 clarification Methods 0.000 claims abstract description 14
- 239000008394 flocculating agent Substances 0.000 claims abstract description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 34
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000000108 ultra-filtration Methods 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 3
- 235000001055 magnesium Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 235000017550 sodium carbonate Nutrition 0.000 claims description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 abstract description 5
- 230000008025 crystallization Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 230000035484 reaction time Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract 1
- 238000005273 aeration Methods 0.000 description 6
- 238000001223 reverse osmosis Methods 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to the field of wastewater treatment, and particularly provides a wastewater softening treatment device and method, wherein the wastewater softening treatment device comprises a mixer, a flocculation tank, a clarification tank, an oxidation tank, a biological filter, a pH adjusting tank, a reaction tank and a high-density filter tank which are sequentially communicated; the method of the device is that firstly, flocculating agent is added into the wastewater, after precipitation and separation, organic matters in the wastewater are removed through chemical oxidation and biological reaction, and then the flocculation reaction time is shortened by a sludge crystallization-induced reflux mode. The technology has important demonstration effects on wastewater reuse and zero emission, and the total hardness and silicate and COD concentration of the pretreated wastewater are greatly reduced.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a wastewater softening treatment device and method.
Background
For a long time, pollution control of high salinity wastewater has not been paid enough attention, and with rapid development of industries such as chemical industry, metallurgy, electric power and urban construction, in order to save and utilize water resources, industrial wastewater, urban wastewater and the like are mostly treated by adopting a reverse osmosis technology and then recycled, so that environmental pollution problems caused by various reverse osmosis concentrated waters generated by the reverse osmosis technology and high salinity wastewater such as industrial circulating water drainage are more and more serious.
The wastewater with high salt content mainly adopts two technologies of reverse osmosis and evaporative crystallization. Whether reverse osmosis or evaporative crystallization, the scaling components such as a large amount of calcium ions, magnesium ions and silicon existing in the salt-containing wastewater have serious scaling hazard to the normal operation of the device. These inorganic salts can cause clogging of the reverse osmosis membrane, reduced water production, and even permanent damage to the membrane. In evaporative crystallization equipment, scaling can also lead to problems such as reduced heat transfer efficiency of the equipment, corrosion of the equipment, and the like. Therefore, the pretreatment work of removing hardness and silicon before wastewater treatment is very important.
The common process route of the hard and silicon removal is as follows: adding a chemical reaction (lime, naOH, sodium carbonate, sodium sulfate, magnesium agent and the like can be added) to soften, adding one or more stages of clarification, and then adding a medium for filtration, wherein the process has some problems in actual operation; when the concentration of magnesium, calcium and silicon contained in tap water is high, the generated precipitate is not easy to separate, the occupied area of a clarification tank is large, the quality of effluent water is difficult to ensure, the dosage is large, the added lime and sodium carbonate are easy to directly react, various problems of fouling and scaling are easy to occur, and the filter and membrane separation system is frequently backwashed and chemically cleaned.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a wastewater softening treatment device and method, which have the advantages of good effect of removing organic matters, less investment, small occupied area, smart equipment, convenient manufacture and the like, and are particularly suitable for recycling treatment of wastewater in coal chemical industry.
The technical scheme adopted by the invention is as follows: a wastewater softening treatment device comprises a mixer, a flocculation tank, a clarification tank, an oxidation tank, a biological filter, a pH adjusting tank, a reaction tank and a high-density filter tank which are sequentially communicated through pipelines, wherein a sludge reflux device connected with the reaction tank is arranged at an outlet of the high-density filter tank. Mainly comprises the following steps:
step ①, settling and decontaminating, uniformly mixing the wastewater in a mixer, entering a flocculation tank and fully reacting with a flocculating agent a under the action of stirring a, and setting the hydraulic retention time to be 0.5-1 hour; the wastewater after the reaction enters a clarification tank, the wastewater naturally settles in the clarification tank, and the hydraulic retention time is set to be 1-3 hours; the sludge is sent out by a sludge discharge pipeline a, and the wastewater overflows into an oxidation tank;
Treating organic matters in the step ②, adding an oxidant into an oxidation pond to decompose the organic matters in the wastewater, enabling the wastewater to enter a biological filter, controlling the oxygen content of the wastewater to be 2-6 ppm, and enabling the wastewater to enter a pH adjusting tank after the COD concentration of the wastewater is reduced to 50 mg/L;
And ③, regulating the pH value, namely adding sodium hydroxide into a pH regulating tank to control the pH value of the wastewater to 9-11, automatically flowing the wastewater to a reaction tank, adding a hardness removing agent into the reaction tank, starting stirring c to enable the hardness removing agent to fully react with the wastewater, filtering by a high-density filter tank, sending out sludge by a sludge discharge pipeline b, returning part of the sludge to the reaction tank by a sludge reflux device, controlling the hardness of the effluent to be less than 100mg/L, and controlling the concentration of silicate to be less than 20mg/L, COD to be less than 50mg/L.
The wastewater includes several of the drainage of circulating water, the concentrated water of desalted water, reclaimed water, the backwash water of a biological filter and the concentrated water of an ultrafiltration device.
The flocculant a is a mixture of polyacrylamide and polymeric ferric sulfate, or any one of the above.
The stirring speed of the stirring a is controlled to be 50-100 rpm so as to enhance the flocculation reaction effect.
The oxidant is one or more of ozone, sodium hypochlorite and hydrogen peroxide, so as to decompose organic matters in the wastewater, and improve the biodegradability of the wastewater.
The sodium hydroxide concentration as described above is 28-36%.
The hard removing agent is one or more of quicklime, slaked lime, sodium carbonate, caustic soda and magnesium agent.
The high-density filter tank is also added with a flocculating agent b, wherein the flocculating agent is a mixture of PAM and PAC or one of the PAM and PAC.
The sludge reflux device comprises a sludge discharge pipeline and a sludge pump which are sequentially connected, wherein the outlet of the high-density filter tank is connected with the sludge pump through a sludge discharge pipeline a and then connected with the inlet of the reaction tank through a sludge discharge pipeline b; the sludge reflux device returns sludge to the hardness removal reaction tank, the sludge reflux ratio is controlled to be 10% -50%, and the sludge reflux ratio is used as a crystal nucleus to improve the reaction efficiency.
The beneficial effects of the invention are as follows:
1. the suspended matters are flocculated and separated before the wastewater is softened, so that magnesium ions and calcium ions are prevented from being released in the subsequent softening process by magnesium carbonate and calcium sulfate, and meanwhile, the influence of the suspended matters on a subsequent BAF pool is reduced.
2. The wastewater mixer is added to better recycle the backwash water of the aeration filter tank, and meanwhile, the concentrated water treated by the subsequent nanofiltration membrane can be recycled, so that the recovery rate of wastewater is improved.
3. The organic matter removing process is added, the hardness in the wastewater is removed, and simultaneously, the organic matters in the wastewater are removed through chemical oxidation and biological reaction, so that the membrane cleaning times can be greatly reduced.
4. The sludge crystallization-inducing reflux mode is adopted, so that the flocculation reaction time is greatly shortened, the reactants of the flocculation sedimentation tank are rapidly increased and become heavy to be settled at the bottom of the sedimentation tank, and the flocculation reaction efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a wastewater softening treatment apparatus and method;
reference numerals: 1-a flocculation tank; 2-a clarification tank; 3-oxidation pond; 4-biological filter; 5-a pH adjusting tank; 6-a reaction tank; 7-a high-density filter tank; 8-a mixer; 9-stirring a;10 stirring-b; 11-stirring c; 12-a sludge reflux device; 13-a sludge discharge line a; 14-sludge discharge line b.
Detailed Description
Example 1:
As shown in figure 1, in the wastewater softening treatment method, drainage from circulating water of a whole plant, concentrated water of desalted water, reclaimed water, backwash water of a biological filter and concentrated water of an ultrafiltration device are uniformly mixed in a mixer 8, enter a flocculation tank 1 to fully react with a flocculant a, a stirring a9 is arranged on the flocculation tank 1, fully react under the stirring effect, hydraulic retention time is set to be 0.5-1 hour, and wastewater after flocculation reaction enters a clarification tank 2; the wastewater naturally settles in the clarification tank 2, the hydraulic retention time is set to be 1 hour, the sludge is sent out by a sludge discharge pipeline a15, and the wastewater overflows into the oxidation tank 3; the oxidant ozone is added into the oxidation tank 3 to decompose organic matters in the wastewater, so as to improve the biodegradability of the wastewater; the wastewater from the oxidation pond 3 enters a biological filter 4, the oxygen content of the wastewater is controlled to be 2ppm by an air aeration device arranged at the bottom of the biological filter 4, and the COD concentration of the wastewater is reduced to be 50mg/L and then enters a pH regulating tank 5; adding sodium hydroxide into a pH adjusting tank 5 to control the pH of wastewater to 9, and feeding the wastewater into a reaction tank 6, wherein a hard removing agent is added into the reaction tank 6, namely: agent a, agent b, agent c; and flocculant b, stirring c11 is started to enable the medicament to fully react with the wastewater, and then the wastewater enters a high-density filter tank 7; the high-density filter tank 7 is mainly used for filtering sediment after flocculation reaction, sediment sludge is sent out by a sludge discharge pipeline b14, part of sludge is returned to the reaction tank by a sludge reflux device 12, and the total hardness is controlled to 80mg/L and the silicate content is controlled to 18mg/L by water outlet indexes.
Example 2:
The treatment method for softening wastewater comprises the steps of mixing wastewater from circulating water of a whole plant, concentrated water of desalted water, reclaimed water of a biological filter tank, backwash water of an ultrafiltration device and concentrated water of an ultrafiltration device uniformly in a mixer 8, enabling the mixed water to enter a flocculation tank 1 to fully react with a flocculant a, setting a stirring a9 on the flocculation tank 1, fully reacting under the stirring effect, setting hydraulic retention time to be 1 hour, and enabling wastewater after flocculation reaction to enter a clarification tank 2; the wastewater naturally settles in the clarification tank 2, the hydraulic retention time is set to be 3 hours, the sludge is sent out by a sludge discharge pipeline a15, and the wastewater overflows into the oxidation tank 3; the oxidant ozone is added into the oxidation tank 3 to decompose organic matters in the wastewater, so as to improve the biodegradability of the wastewater; the wastewater from the oxidation pond 3 enters a biological filter 4, the oxygen content of the wastewater is controlled to be 6ppm by an air aeration device arranged at the bottom of the biological filter 4, and the COD concentration of the wastewater is reduced to 40mg/L and then enters a pH regulating tank 5; adding sodium hydroxide into a pH adjusting tank 5 to control the pH of wastewater to be 11, and entering a reaction tank 6, wherein a hard removing agent is added into the reaction tank 6, namely: agent a, agent b, agent c; and flocculant b, stirring c11 is started to enable the medicament to fully react with the wastewater, and then the wastewater enters a high-density filter tank 7; the high-density filter tank 7 is mainly used for filtering sediment after flocculation reaction, sediment sludge is sent out by a sludge discharge pipeline b14, part of sludge is returned to the reaction tank by a sludge reflux device 12, and the total hardness is controlled to 90mg/L and the silicate content is controlled to 19mg/L by water outlet indexes.
Another embodiment differs from the above embodiment in that: the hydraulic residence time of the flocculation tank described in step ① is controlled at 0.5 hours.
Another embodiment differs from the above embodiment in that: the hydraulic residence time of the flocculation tank described in step ① is controlled to 1 hour.
Another embodiment differs from the above embodiment in that: the stirring speed of stirring a in step ① is controlled at 50 rpm.
Another embodiment differs from the above embodiment in that: the stirring speed of stirring a in step ① is controlled at 100 rpm.
Another embodiment differs from the above embodiment in that: the clarifier set in step ① was set to hydraulic residence time of 1 hour.
Another embodiment differs from the above embodiment in that: the clarifier set in step ① was set to hydraulic residence time of 2 hours.
Another embodiment differs from the above embodiment in that: the clarifier set in step ① was set to hydraulic residence time of 3 hours.
Another embodiment differs from the above embodiment in that: an air aeration device is arranged at the bottom of the biological filter in the step ②, and the oxygen concentration in water is controlled to be 2ppm.
Another embodiment differs from the above embodiment in that: an air aeration device is arranged at the bottom of the biological filter in the step ②, and the oxygen concentration in water is controlled to be 4ppm.
Another embodiment differs from the above embodiment in that: an air aeration device is arranged at the bottom of the biological filter in the step ②, and the oxygen concentration in water is controlled to be 6ppm.
Another embodiment differs from the above embodiment in that: the sludge reflux device in the step ③ returns the sludge to the hardness removal reaction tank, and the sludge reflux ratio is controlled to be 10%.
Another embodiment differs from the above embodiment in that: the sludge reflux device in the step ③ returns the sludge to the hardness removal reaction tank, and the sludge reflux ratio is controlled to be 30%.
Another embodiment differs from the above embodiment in that: the sludge reflux device in step ③ returns the sludge to the hardness removal reaction tank, and the sludge reflux ratio is controlled to be 50%.
Another embodiment differs from the above embodiment in that: the wastewater comprises the drainage of circulating water, the concentrated water of desalted water and reclaimed water.
Another embodiment differs from the above embodiment in that: the wastewater comprises the drainage of circulating water, the concentrated water of desalted water, reclaimed water, the backwash water of a biological filter and the concentrated water of an ultrafiltration device.
Another embodiment differs from the above embodiment in that: the oxidant is ozone.
Another embodiment differs from the above embodiment in that: the oxidant is sodium hypochlorite.
Another embodiment differs from the above embodiment in that: the oxidant is hydrogen peroxide.
Another embodiment differs from the above embodiment in that: the sodium hydroxide concentration was 32%.
Another embodiment differs from the above embodiment in that: the concentration of sodium hydroxide is 28% or 30%.
Another embodiment differs from the above embodiment in that: the hard removing agent is quicklime, slaked lime, sodium carbonate, caustic soda and magnesium agent.
Another embodiment differs from the above embodiment in that: the flocculant is PAM.
Another embodiment differs from the above embodiment in that: the flocculant is PAC.
Another embodiment differs from the above embodiment in that: the flocculant is a mixture of PAM and PAC.
Claims (6)
1. A wastewater softening treatment method is characterized in that: the device comprises a wastewater softening device, wherein the wastewater softening device comprises a mixer, a flocculation tank, a clarification tank, an oxidation tank, a biological filter, a pH adjusting tank, a reaction tank and a high-density filter tank which are sequentially communicated through pipelines, and a sludge reflux device connected with the reaction tank is arranged at an outlet of the high-density filter tank; the sludge reflux device comprises a sludge discharge pipeline and a sludge pump which are sequentially connected, and an outlet of the high-density filter tank is connected with the sludge pump through a sludge discharge pipeline a and then connected with an inlet of the reaction tank through a sludge discharge pipeline b;
A wastewater treatment method adopting a wastewater softening device mainly comprises the following steps:
step ①, settling and decontaminating, uniformly mixing the wastewater in a mixer, entering a flocculation tank and fully reacting with a flocculating agent a under the action of stirring a, and setting the hydraulic retention time to be 0.5-1 hour; the wastewater after the reaction enters a clarification tank, the wastewater naturally settles in the clarification tank, and the hydraulic retention time is set to be 1-3 hours; the sludge is sent out by a sludge discharge pipeline a, and the wastewater overflows into an oxidation tank;
Treating organic matters in the step ②, adding an oxidant into an oxidation pond to decompose the organic matters in the wastewater, enabling the wastewater to enter a biological filter, controlling the oxygen content of the wastewater to be 2-6 ppm, and enabling the wastewater to enter a pH adjusting tank after the COD concentration of the wastewater is reduced to 50 mg/L;
③, softening treatment, namely adding sodium hydroxide into a pH adjusting tank to control the pH of wastewater to 9-11, automatically flowing the wastewater to a reaction tank, adding a hardness removing agent into the reaction tank, starting stirring c to enable the hardness removing agent to fully react with the wastewater, filtering by a high-density filter tank, sending out sludge by a sludge discharge pipeline b, returning part of the sludge to the reaction tank by a sludge reflux device, controlling the hardness of the effluent to be less than 100mg/L, and controlling the concentration of silicate to be less than 20mg/L, COD to be less than 50mg/L;
The wastewater comprises drainage of circulating water, concentrated water of desalted water, reclaimed water, backwash water of a biological filter and concentrated water of an ultrafiltration device; the sludge reflux device returns the sludge to the hardness removal reaction tank, and the sludge reflux ratio is controlled to be 10% -50%.
2. A method for softening wastewater in accordance with claim 1, wherein: the flocculant a is any one or a mixture of polyacrylamide and polymeric ferric sulfate.
3. A method for softening wastewater in accordance with claim 1, wherein: the oxidant is one or more of ozone, sodium hypochlorite and hydrogen peroxide.
4. A method for softening wastewater in accordance with claim 1, wherein: the concentration of sodium hydroxide is 28-36%.
5. A method for softening wastewater in accordance with claim 1, wherein: the hard removing agent is one or more of quicklime, slaked lime, sodium carbonate, caustic soda and magnesium agent.
6. A method for softening wastewater in accordance with claim 1, wherein: the high-density filter tank is also added with a flocculating agent b which is a mixture of PAM and PAC or one of the mixture.
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