CN114716053A - Softening pretreatment method for high-COD high-salinity wastewater - Google Patents
Softening pretreatment method for high-COD high-salinity wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 136
- 238000002203 pretreatment Methods 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000012528 membrane Substances 0.000 claims abstract description 45
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 238000001471 micro-filtration Methods 0.000 claims abstract description 29
- 238000005086 pumping Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 23
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 6
- 238000010517 secondary reaction Methods 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000004902 Softening Agent Substances 0.000 claims description 26
- 239000011575 calcium Substances 0.000 claims description 13
- 239000007832 Na2SO4 Substances 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 5
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 5
- 229910001424 calcium ion Inorganic materials 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000009295 crossflow filtration Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 230000001143 conditioned effect Effects 0.000 claims 1
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
- C02F5/06—Softening water by precipitation of the hardness using calcium compounds
-
- 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
- C02F5/02—Softening water by precipitation of the hardness
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
- C02F2209/055—Hardness
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
The invention discloses a softening pretreatment method of high COD high-salinity wastewater, which comprises the steps of conveying the high-salinity wastewater into a regulating tank for regulation; pumping the adjusted wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge; pumping alkaline wastewater and sludge into a secondary reaction tank, pumping the wastewater, sludge and powdered activated carbon adsorbing organic micromolecule COD after the treatment in the step S03 into a concentration tank for concentration treatment, then lifting the wastewater after the concentration treatment in the step S04 into a tubular microfiltration device through a tubular membrane circulating pump, and treating the wastewater through the tubular microfiltration device to obtain tubular membrane produced water; and (3) adding hydrochloric acid into the tubular membrane produced water, adjusting the pH of the tubular membrane produced water to 6, and removing free carbon dioxide in the wastewater to obtain final produced water. The method has low cost and less sludge amount, reduces COD, hardness, alkalinity and suspended matters in the wastewater, provides favorable conditions for the subsequent membrane concentration treatment, and the produced water after the pretreatment method can reach the discharge standard.
Description
Technical Field
The invention relates to a softening pretreatment method for high-COD high-salinity wastewater, belonging to the field of water treatment.
Background
In the process of concentrating high-salinity wastewater containing organic molecular COD and realizing zero discharge, the organic molecular COD often causes pollution, blockage and damage of a membrane concentration device and paralysis of a membrane concentration treatment system, and the organic molecular COD cannot be removed by conventional pretreatment.
Disclosure of Invention
The invention aims to provide a softening pretreatment method for high-COD high-salinity wastewater, which has low cost and less sludge amount for treating the high-salinity wastewater, can reduce COD, hardness, alkalinity and suspended matters in the wastewater, can provide favorable conditions for subsequent membrane concentration treatment, and can further concentrate produced water after the pretreatment method by using a membrane.
In order to solve the technical problems, the invention adopts the following technical scheme: a softening pretreatment method for high-COD high-salinity wastewater is characterized by comprising the following steps: step S01, conveying the high-salinity wastewater into a regulating tank for regulation to obtain regulated wastewater;
step S02, pumping the adjusted wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge; the primary wastewater is adjusted by adding a softening agent A, wherein the softening agent A is NaOH or Ca (OH)2Or NaOH and Ca (OH)2The mixing agent is used for adjusting the pH value of the wastewater to 11-11.5 and removing magnesium ions in the wastewater; the first-stage wastewater regulation further comprises adding a softening agent B, wherein the softening agent B is Na2CO3Or Na2SO4Or Na2CO3And Na2SO4The mixture of (1) removing calcium ions in the wastewater;
step S03, pumping the alkaline wastewater and the sludge into a secondary reaction tank, adding a certain mesh and quantity of powdered activated carbon according to the inflow rate, and adsorbing organic micromolecule COD in the alkaline wastewater by the powdered activated carbon;
step S04, pumping the wastewater, the sludge and the powdered activated carbon for adsorbing organic micromolecule COD which are treated in the step S03 into a concentration tank together for concentration treatment, and discharging the sludge and the powdered activated carbon for adsorbing COD after the sludge and the powdered activated carbon for adsorbing COD are concentrated to a certain concentration;
step S05, lifting the wastewater concentrated in the step S04 into a tubular microfiltration device through a tubular membrane circulating pump, and treating the wastewater by the tubular microfiltration device to obtain tubular membrane produced water;
step S06, hydrochloric acid is added into the tubular membrane produced water to adjust the pH of the tubular membrane produced water to 6,
step S07: pumping the wastewater treated in the step S06 into a carbon remover to remove free carbon dioxide in the wastewater to obtain final produced water;
and step S08, pumping the final produced water into a storage tank or recycling.
In the method for softening and pretreating high-COD and high-salinity wastewater, the tubular microfiltration circulation flow is 10-20 times of the filtration water production flow.
In the method for softening and pretreating high-COD high-salinity wastewater, the water yield of the tubular membrane in the tubular microfiltration device is 150-200 LMH, the SDI (standard deviation) of the produced water of the tubular membrane is less than or equal to 3, the turbidity is less than or equal to 1, and the removal rate of COD (chemical oxygen demand) of the produced water is 30-50%.
In the method for softening and pretreating high-COD and high-salinity wastewater, the treatment process of the step S05 is carried out simultaneously by performing large-flow circulating cross-flow filtration between the concentration tank and the tubular microfiltration device.
In the softening pretreatment method of the high-COD high-salinity wastewater, the TDS of the high-salinity wastewater is more than or equal to 25000mg/L, the COD of the organic micromolecule is less than or equal to 500mg/L, and the content of the suspended solid is 0.1-1%.
In the method for softening and pretreating high-COD and high-salinity wastewater, the primary wastewater regulation further comprises adding a magnesium agent to reduce silicon in the wastewater; the PH value of the wastewater is adjusted to 11-11.5 by adding the softening agent A, the softening agent B and the magnesium agent, the hardness of magnesium in the wastewater is reduced to be less than or equal to 20mg/L, the silicon content is reduced to be less than or equal to 10mg/L, and the hardness of calcium is reduced to be less than or equal to 40 mg/L.
Compared with the prior art, the pretreatment method of the invention pre-regulates the high-salinity wastewater, pumps the high-salinity wastewater into the two-stage reaction tanks to respectively carry out early treatment on the pH value and the organic micromolecule COD of the wastewater, then concentrates and treats the sludge of the wastewater, reduces the sludge content in the final produced water, effectively reduces the COD, the hardness, the alkalinity and the suspended solids in the wastewater by the method of the invention, can provide favorable conditions for the subsequent membrane concentration treatment, and the produced water after the pretreatment method can reach the discharge standard and has low treatment cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a work flow diagram of the method of the present invention;
fig. 2 is a diagram of a system for implementing the method of the present invention.
Reference numerals: 1-regulating reservoir, 2-first-stage reaction tank, 3-concentration tank, 4-tubular microfiltration device, 5-decarbonizer, 6-second-stage reaction tank, 7-circulation backflow pipe, 8-tubular membrane water production tank, 9-hydrochloric acid adding device, 10-hydrochloric acid conveying pipe, 11-sludge discharge pipe, 12-first softener adding device, 13-second softener adding device and 14-powdered activated carbon adding device.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1 of the invention: a softening pretreatment method for high-COD high-salinity wastewater comprises the following steps: step S01, conveying the high-salinity wastewater into a regulating tank for regulation to obtain regulated wastewater; step S02, pumping the adjusted wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge; the primary wastewater is adjusted by adding a softening agent A, wherein the softening agent A is NaOH or Ca (OH)2Or NaOH and Ca (OH)2The method comprises the steps of adjusting the PH value of the wastewater to 11-11.5, removing magnesium ions in the wastewater, adding a softening agent B into the primary wastewater, wherein the softening agent B is Na2CO3Or Na2SO4Or Na2CO3And Na2SO4The mixture of (1) removing calcium ions in the wastewater; step S03, pumping the alkaline wastewater and the sludge into a secondary reaction tank, and adding a certain amount of powder with certain mesh number according to the water inflow rateCarbon, powdered activated carbon adsorbs organic micromolecular COD in the alkaline wastewater; step S04, pumping the wastewater, the sludge and the powdered activated carbon for adsorbing organic micromolecule COD which are treated in the step S03 into a concentration tank together for concentration treatment, and discharging the sludge and the powdered activated carbon for adsorbing COD after the sludge and the powdered activated carbon for adsorbing COD are concentrated to a certain concentration; step S05, lifting the wastewater concentrated in the step S04 into a tubular microfiltration device through a tubular membrane circulating pump, and treating the wastewater by the tubular microfiltration device to obtain tubular membrane produced water; step S06, hydrochloric acid is added into the tubular membrane produced water, the pH of the tubular membrane produced water is adjusted to 6, and step S07: pumping the wastewater treated in the step S06 into a carbon remover to remove free carbon dioxide in the wastewater to obtain final produced water; and step S08, pumping the final produced water into the tubular membrane water producing pool for storage or reuse.
Example 2 of the invention: a softening pretreatment method for high-COD high-salinity wastewater comprises the following steps: step S01, conveying the high-salinity wastewater into a regulating tank for regulation to obtain regulated wastewater; step S02, pumping the adjusted wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge; the primary wastewater is adjusted by adding a softening agent A, wherein the softening agent A is NaOH or Ca (OH)2Or NaOH and Ca (OH)2The method comprises the steps of adjusting the PH value of the wastewater to 11-11.5, removing magnesium ions in the wastewater, adding a softening agent B into the primary wastewater, wherein the softening agent B is Na2CO3Or Na2SO4Or Na2CO3And Na2SO4The mixture of (1) removing calcium ions in the wastewater; step S03, pumping the alkaline wastewater and the sludge into a secondary reaction tank, adding a certain mesh and quantity of powdered activated carbon according to the inflow rate, and adsorbing organic micromolecule COD in the alkaline wastewater by the powdered activated carbon; step S04, pumping the wastewater, the sludge and the powdered activated carbon for adsorbing organic micromolecule COD which are treated in the step S03 into a concentration tank together for concentration treatment, and discharging the sludge and the powdered activated carbon for adsorbing COD after the sludge and the powdered activated carbon for adsorbing COD are concentrated to a certain concentration; step S05, the wastewater concentrated in the step S04 is lifted into a tubular microfiltration device through a tubular membrane circulating pump and is treated by the tubular microfiltration device to obtainProducing water by a tubular membrane; step S06, hydrochloric acid is added into the tubular membrane produced water, the pH of the tubular membrane produced water is adjusted to 6, and step S07: pumping the wastewater treated in the step S06 into a carbon remover to remove free carbon dioxide in the wastewater to obtain final produced water; and step S08, pumping the final produced water into a tubular membrane water producing pool for storage or reuse. Wherein, the tubular microfiltration circulation flow is 10-20 times of the filtration water production flow. The water yield of the tubular membrane in the tubular microfiltration device is 150 LMH-200 LMH, the SDI (standard deviation) of the produced water of the tubular membrane is less than or equal to 3, the turbidity is less than or equal to 1, and the removal rate of COD (chemical oxygen demand) of the produced water is 30-50%. And in the treatment process of the step S05, simultaneously, large-flow circulating cross-flow filtration is carried out between the concentration tank and the tubular microfiltration device. The high-salinity wastewater is TDS more than or equal to 25000mg/L, organic micromolecule COD less than or equal to 500mg/L and suspended solid content of 0.1-1%.
Example 3 of the invention: a softening pretreatment method for high-COD high-salinity wastewater comprises the following steps: step S01, conveying the high-salinity wastewater into a regulating tank for regulation to obtain regulated wastewater; step S02, pumping the adjusting wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge; the primary wastewater is adjusted by adding a softening agent A, wherein the softening agent A is NaOH or Ca (OH)2Or NaOH and Ca (OH)2The method comprises the steps of adjusting the PH value of the wastewater to 11-11.5, removing magnesium ions in the wastewater, adding a softening agent B into the primary wastewater, wherein the softening agent B is Na2CO3Or Na2SO4Or Na2CO3And Na2SO4The mixture of (1) removing calcium ions in the wastewater; step S03, pumping the alkaline wastewater and the sludge into a secondary reaction tank, adding a certain mesh and quantity of powdered activated carbon according to the inflow rate, and adsorbing organic micromolecule COD in the alkaline wastewater by the powdered activated carbon; step S04, pumping the wastewater, the sludge and the powdered activated carbon for adsorbing organic micromolecule COD which are treated in the step S03 into a concentration tank together for concentration treatment, and discharging the sludge and the powdered activated carbon for adsorbing COD after the sludge and the powdered activated carbon for adsorbing COD are concentrated to a certain concentration; step S05, the wastewater concentrated in the step S04 is lifted to a tubular microfiltration device through a tubular membrane circulating pump, and the tubular microfiltration deviceTreating to obtain tubular membrane produced water; step S06, hydrochloric acid is added into the tubular membrane produced water to adjust the pH of the tubular membrane produced water to 6, and step S07: pumping the wastewater treated in the step S06 into a carbon remover to remove free carbon dioxide in the wastewater to obtain final produced water; and step S08, pumping the final produced water into the tubular membrane water producing pool for storage or reuse. Wherein, the tubular microfiltration circulation flow is 10-20 times of the filtration water production flow. The water yield of the tubular membrane in the tubular microfiltration device is 150 LMH-200 LMH, the SDI (standard deviation) of the produced water of the tubular membrane is less than or equal to 3, the turbidity is less than or equal to 1, and the removal rate of COD (chemical oxygen demand) of the produced water is 30-50%. In the treatment process of the step S05, high-flow circulating cross-flow filtration is simultaneously carried out between the concentration tank and the tubular microfiltration device. The high-salinity wastewater is TDS more than or equal to 25000mg/L, organic micromolecule COD less than or equal to 500mg/L and suspended solid content of 0.1-1%. The primary wastewater regulation also comprises the step of adding a magnesium agent to reduce silicon in the wastewater, the PH value of the wastewater is increased to 11-11.5 by adding a softening agent A, a softening agent B and the magnesium agent, the hardness of magnesium in the wastewater is reduced to be less than or equal to 20mg/L, the silicon content is reduced to be less than or equal to 10mg/L, and the hardness of calcium is reduced to be less than or equal to 40 mg/L.
The pretreatment system for realizing the method comprises a regulating reservoir 1, a first-stage reaction reservoir 2, a concentration reservoir 3, a tubular microfiltration device 4, a decarbonizer 5, a second-stage reaction reservoir 6, a tubular membrane water production reservoir 8, a hydrochloric acid adding device 9, a hydrochloric acid conveying pipe 10, a sludge discharge pipe 11, a first softener adding device 12, a second softener adding device 13, a powdered activated carbon adding device 14 and a circulating return pipe 7, wherein the regulating reservoir 1 is connected with the first-stage reaction reservoir 2, the first-stage reaction reservoir is connected with the concentration reservoir 3, the concentration reservoir 3 is connected with the tubular microfiltration device 4, and the tubular microfiltration device 4 is connected with the decarbonizer 5, as shown in fig. 2. The second-stage reaction tank 6 is arranged between the first-stage reaction tank 2 and the concentration tank 3, and the first-stage reaction tank 2 is connected with the concentration tank 3 through the second-stage reaction tank 6. The tubular membrane water producing tank 8 is connected with the carbon remover 5. The hydrochloric acid addition device 9 is connected to the decarbonizer 5 through a hydrochloric acid delivery pipe 10. The concentration tank 3 is provided with a sludge discharge port, and the sludge discharge pipe 11 is connected with the sludge discharge port. The first softener adding device 12 is connected with the primary reaction tank 2. The second softener adding device 13 is connected with the primary reaction tank 2. The powdered activated carbon adding device 14 is connected with the second-stage reaction tank 6, one end of the circulating return pipe 7 is connected with the tubular microfiltration device 4, and the other end of the circulating return pipe 7 is connected with the concentration tank 3.
Claims (6)
1. A softening pretreatment method for high-COD high-salinity wastewater is characterized by comprising the following steps:
step S01, conveying the high-salinity wastewater into a regulating tank for regulation to obtain regulated wastewater;
step S02, pumping the adjusted wastewater to a primary reaction tank for primary wastewater adjustment to obtain alkaline wastewater and sludge;
the primary wastewater is adjusted by adding a softening agent A, wherein the softening agent A is NaOH or Ca (OH)2Or NaOH and Ca (OH)2The mixing agent is used for adjusting the pH value of the wastewater to 11-11.5 and removing magnesium ions in the wastewater;
the first-stage wastewater regulation further comprises adding a softening agent B, wherein the softening agent B is Na2CO3Or Na2SO4Or Na2CO3And Na2SO4The mixture of (2), removing calcium ions in the wastewater;
step S03, pumping the alkaline wastewater and the sludge into a secondary reaction tank, adding a certain mesh and quantity of powdered activated carbon according to the inflow rate, and adsorbing organic micromolecule COD in the alkaline wastewater by the powdered activated carbon;
step S04, pumping the wastewater, the sludge and the powdered activated carbon for adsorbing organic micromolecule COD which are treated in the step S03 into a concentration tank together for concentration treatment, and discharging the sludge and the powdered activated carbon for adsorbing COD after the sludge and the powdered activated carbon for adsorbing COD are concentrated to a certain concentration;
step S05, lifting the wastewater concentrated in the step S04 into a tubular microfiltration device through a tubular membrane circulating pump, and treating the wastewater by the tubular microfiltration device to obtain tubular membrane produced water;
step S06, hydrochloric acid is added into the tubular membrane produced water, and the PH of the tubular membrane produced water is adjusted to 6;
step S07: pumping the wastewater treated in the step S06 into a carbon remover to remove free carbon dioxide in the wastewater to obtain final produced water;
and step S08, pumping the final produced water into the tubular membrane water producing pool for storage or reuse.
2. The softening pretreatment method of high-COD high-salinity wastewater according to claim 1, characterized in that the flow rate of the tubular microfiltration circulation is 10-20 times of the flow rate of the filtered water.
3. The softening pretreatment method of high-COD and high-salinity wastewater according to claim 2, characterized in that the water yield of the tubular membrane in the tubular microfiltration device is 150-200 LMH, the tubular membrane produced water SDI is less than or equal to 3, the turbidity is less than or equal to 1, and the COD removal rate of the produced water is 30-50%.
4. The method for pre-treating wastewater with high COD and high salinity according to claim 3, characterized in that, in the step S05, the treatment process is carried out by a large-flow circulating cross-flow filtration between the concentration tank and the tubular microfiltration device.
5. The high-COD high-salinity wastewater softening pretreatment method according to claim 4, characterized in that the high-salinity wastewater has TDS more than or equal to 25000mg/L, organic micromolecule COD less than or equal to 500mg/L and suspended solid content of 0.1-1%.
6. The method of claim 5, wherein the primary wastewater conditioning further comprises adding magnesium to reduce silicon in the wastewater, increasing the pH of the conditioned wastewater to 11 or higher by adding softening agent A, softening agent B and magnesium to reduce the hardness of magnesium in the wastewater to 20mg/L or less, the silicon content to 10mg/L or less, and the calcium hardness to 40mg/L or less.
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| CN115676952A (en) * | 2022-09-14 | 2023-02-03 | 华电水务工程有限公司 | Method for extracting and dephenolizing phenolic wastewater |
| CN117865422A (en) * | 2024-03-13 | 2024-04-12 | 杭州水处理技术研究开发中心有限公司 | Treatment process and system for softening high-salt negative hard wastewater and volatile organic compounds |
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