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CN110898675A - A kind of calcium sulfate scale cleaning agent and cleaning method for reverse osmosis membrane - Google Patents

A kind of calcium sulfate scale cleaning agent and cleaning method for reverse osmosis membrane Download PDF

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Publication number
CN110898675A
CN110898675A CN201911254050.1A CN201911254050A CN110898675A CN 110898675 A CN110898675 A CN 110898675A CN 201911254050 A CN201911254050 A CN 201911254050A CN 110898675 A CN110898675 A CN 110898675A
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cleaning
reverse osmosis
acid
agent
cleaning agent
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Inventor
周诗宇
张春波
王久生
张建新
胡婧婷
刘熙旸
李沛
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Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
State Grid Corp of China SGCC
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Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
State Grid Corp of China SGCC
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Priority to CN201911254050.1A priority Critical patent/CN110898675A/en
Publication of CN110898675A publication Critical patent/CN110898675A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/162—Use of acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/164—Use of bases
    • 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
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
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Abstract

The invention relates to a calcium sulfate scale cleaning agent for a reverse osmosis membrane and a cleaning method, belonging to the technical field of water treatment. 0.5 to 2 percent of alkali liquor, 0.2 to 0.4 percent of pH regulator, 0.05 to 0.15 percent of dispersant, 0.01 to 0.03 percent of surfactant, 0.05 to 0.2 percent of chelating agent and the balance of reverse osmosis water. The pickling cleaning agent is prepared from the following raw materials in parts by mass: 2 to 10 percent of acid liquor, 0.3 to 0.5 percent of pH regulator, 0.01 to 0.03 percent of surfactant, 0.05 to 0.25 percent of chelating agent, 0.02 to 0.05 percent of reducing agent, 0.05 to 0.2 percent of bactericide and the balance of reverse osmosis water. The method has the advantages that the removal rate of calcium sulfate scale can reach 98.8%, the differential pressure of the first stage and the second stage of reverse osmosis is reduced by 46% and 62.5%, the desalination rate is improved to more than 98%, the water production flow is improved by 44%, and the method can be widely applied to reverse osmosis membranes on the market and can also be applied to cleaning ultrafiltration membranes.

Description

Calcium sulfate scale cleaning agent for reverse osmosis membrane and cleaning method
Technical Field
The invention belongs to the technical field of water treatment, and relates to a reverse osmosis cleaning agent and a cleaning method thereof, in particular to a cleaning method for calcium sulfate scale dirt blockage of a reverse osmosis membrane.
Background
The reverse osmosis technology is a technology which uses pressure as driving force and realizes substance separation by utilizing the selective permeability of a membrane. In the water treatment of a thermal power plant, reverse osmosis is commonly used for pre-desalting of ion exchange so as to reduce the salt content of inlet water of ion exchange equipment, prolong the operation period and reduce the discharge of waste acid and waste alkali.
In systems with poor pretreatment, reverse osmosis membranes are gradually contaminated with inorganic substances, microorganisms, metal oxides, colloids and insoluble organic substances in the concentrate. After pollutants in water are deposited in a water flow channel of the membrane component, the water flow resistance is increased, the water yield is reduced, and the pressure drop is increased. The contaminants also plug the membrane pores and permeate the membrane under pressure into the fresh water, causing the quality of the fresh water to degrade. The reverse osmosis membrane scale is mainly carbonate scale, sulfate scale and silicate scale, and a small amount of iron-aluminum-silicon compounds exist, wherein the sulfate scale and the silicate scale are the most difficult to remove. The choice of reverse osmosis cleaning agent and cleaning method has important influence on the performance recovery and the expected life of the reverse osmosis membrane after pollution, so as to avoid long-term irreversible damage.
Disclosure of Invention
The invention provides a calcium sulfate scale cleaning agent and a cleaning method for a reverse osmosis membrane, and aims to clean the pollution conditions of a reverse osmosis system, including system scaling, microbial pollution, organic matter particle adhesion and the like, particularly the pollution and blockage conditions of calcium sulfate scales, so as to improve the desalination rate of the reverse osmosis membrane, reduce the pressure difference of a first stage and a second stage, improve the service condition of the reverse osmosis system, prolong the service life of the membrane and reduce the production cost.
The technical scheme adopted by the invention is as follows:
the method comprises the following steps: the cleaning agent comprises an alkali washing cleaning agent and an acid washing cleaning agent, wherein the alkali washing cleaning agent is prepared from the following raw materials in percentage by mass according to solute: 0.5 to 2 percent of alkali liquor, 0.2 to 0.4 percent of pH regulator, 0.05 to 0.15 percent of dispersant, 0.01 to 0.03 percent of surfactant, 0.05 to 0.2 percent of chelating agent and the balance of reverse osmosis water; the pickling cleaning agent is prepared from the following raw materials in parts by mass: 2 to 10 percent of acid liquor, 0.3 to 0.5 percent of pH regulator, 0.01 to 0.03 percent of surfactant, 0.05 to 0.25 percent of chelating agent, 0.02 to 0.05 percent of reducing agent, 0.05 to 0.2 percent of bactericide and the balance of reverse osmosis water.
The alkali liquor is Na2CO3And Na (PO)4)3Prepared in a ratio of 1: 2.
The acid solution is one or more of citric acid, glycolic acid, formic acid and sulfamic acid.
The pH regulator in the alkaline cleaning agent is one of sodium hydroxide and potassium hydroxide; the pH regulator in the acid cleaning agent is one of hydrochloric acid and sulfuric acid.
The dispersant is one or more of polyethylene glycol and polyacrylic acid; the surfactant is one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium sulfamate and fatty alcohol-polyoxyethylene ether; the chelating agent is one or more of ethylene diamine tetraacetic acid disodium salt (EDTA disodium salt), ethylene diamine tetraacetic acid tetrasodium salt (EDTA tetrasodium salt), ethylene glycol diethyl ether diamine tetraacetic acid dipotassium salt (EGTA dipotassium salt) and nitrilotriacetic acid; the reducing agent is sodium erythorbate; the bactericide is one or more of isothiazolinone and dodecyl dimethyl benzyl ammonium chloride.
The pH value of the alkaline cleaning agent is 10-12, and the pH value of the acid cleaning agent is 2-4.
A method for cleaning calcium sulfate scale of reverse osmosis membrane comprises the following steps:
step one, preparing an alkaline washing cleaning agent, fully dissolving the cleaning agent by using reverse osmosis produced water, and placing the cleaning agent in an alkaline washing cleaning box; starting a cleaning pump, injecting an alkali cleaning agent into the reverse osmosis membrane system, adjusting the water temperature, controlling the flow rate of a cleaning solution, circularly cleaning for 1h, then soaking for 30min, and repeatedly cleaning and soaking for 2-3 times;
step two, after the alkaline cleaning is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7;
step three, preparing a pickling cleaning agent, fully dissolving the pickling cleaning agent by using reverse osmosis produced water, and placing the pickling cleaning agent in a pickling cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature, controlling the flow rate of a cleaning solution, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 2-3 times;
and step four, after the acid washing is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7.
In the first step of the invention, the water temperature is 30-45 ℃, and the flow rate of the cleaning fluid is 0.1-0.2 m/s; in the third step, the water temperature is 30-45 ℃, and the flow rate of the cleaning solution is 0.15-0.3 m/s.
The method has the advantages of low cost, simple and convenient operation and short process time, the removal rate of calcium sulfate scale can reach 98.8 percent, the differential pressure of the first reverse osmosis stage and the second reverse osmosis stage is reduced by 46 percent and 62.5 percent, the desalination rate is improved to more than 98 percent, the water production flow is improved by 44 percent, the service life of equipment is prolonged, the production cost is saved, meanwhile, the cleaning waste liquid can be discharged after acid-base neutralization, and the method has small environmental pollution.
Detailed Description
Example 1
A method for cleaning reverse osmosis calcium sulfate scale comprises the following steps of proportioning raw materials according to mass fraction of solute:
step one, preparing an alkaline washing cleaning agent with the pH value of 10:
0.5% alkali solution: na (Na)2CO3:Na(PO4)3＝1:2；
0.2% pH adjuster: KOH;
0.05% dispersant: polyethylene glycol;
0.02% surfactant: sodium dodecylbenzenesulfonate;
0.08% chelating agent: nitrilotriacetic acid;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an alkaline washing and cleaning box; starting a cleaning pump, injecting an alkaline cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 45 ℃, controlling the flow rate of a cleaning solution to be 0.2m/s, circularly cleaning for 1h, soaking for 30min, and repeatedly cleaning and soaking for 2 times;
step two, after the alkaline cleaning is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7;
step three, preparing an acid washing cleaning agent with the pH value of 4:
2% acid solution: citric acid;
0.3% pH adjuster: h2SO4；
0.01% surfactant: sodium dodecylbenzenesulfonate;
0.05% chelating agent: EDTA disodium salt;
0.02% reducing agent: sodium erythorbate;
0.05% of a bactericide: isothiazolinone;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an acid washing and cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 35 ℃, controlling the flow rate of the cleaning agent to be 0.3m/s, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 2 times;
and step four, after the acid washing is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7.
Example 2
A method for cleaning reverse osmosis calcium sulfate scale comprises the following steps of proportioning raw materials according to mass fraction of solute:
step one, preparing an alkaline washing cleaning agent with the pH value of 11:
1.0% alkali solution: na (Na)2CO3:Na(PO4)3＝1:2；
0.25% pH adjuster: NaOH;
0.15% dispersant: polyacrylic acid;
0.025% surfactant: fatty alcohol polyoxyethylene ether;
0.1% chelating agent: EDTA tetrasodium salt;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an alkaline washing and cleaning box; starting a cleaning pump, injecting an alkaline cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 35 ℃, controlling the flow rate of the cleaning agent to be 0.1m/s, circularly cleaning for 1h, soaking for 30min, and repeatedly cleaning and soaking for 3 times;
step two, after the alkaline cleaning is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7;
step three, preparing an acid washing cleaning agent with the pH value of 3.5:
10% acid liquor; sulfamic acid;
0.4% pH adjuster: HCl;
0.03% surfactant: fatty alcohol polyoxyethylene ether;
0.25% chelating agent: EGTA dipotassium salt;
0.035% reducing agent: sodium erythorbate;
0.2% of a bactericide: isothiazolinone;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an acid washing and cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 45 ℃, controlling the flow rate of a cleaning solution to be 0.25m/s, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 2 times;
and step four, after the acid washing is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7.
Example 3
A method for cleaning reverse osmosis calcium sulfate scale comprises the following steps of proportioning raw materials according to mass fraction of solute:
the method comprises the following steps: preparing an alkaline washing cleaning agent pH11.5:
1.5% alkali solution: na (Na)2CO3:Na(PO4)3＝1:2；
0.4% pH adjuster: NaOH;
0.15% dispersant: polyacrylic acid;
0.02% surfactant: sodium dodecyl sulfate;
0.2% chelating agent: EDTA disodium salt;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an alkaline washing and cleaning box; starting a cleaning pump, injecting an alkaline cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 40 ℃, controlling the flow rate of a cleaning solution to be 0.15m/s, circularly cleaning for 1h, soaking for 30min, and repeatedly cleaning and soaking for 3 times;
step two, after the alkaline cleaning is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7;
step three, preparing an acid washing cleaning agent with the pH value of 2:
6% acid solution: glycolic acid: formic acid 1: 1;
0.4% pH adjuster: h2SO4；
0.02% surfactant: fatty alcohol polyoxyethylene ether;
0.25% chelating agent: EDTA tetrasodium salt;
0.035% reducing agent: sodium erythorbate;
0.1% of a bactericide: isothiazolinone;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an acid washing and cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 40 ℃, controlling the flow rate of a cleaning solution to be 0.2m/s, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 3 times;
and step four, after the acid washing is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7.
Example 4
A method for cleaning reverse osmosis calcium sulfate scale comprises the following steps of proportioning raw materials according to mass fraction of solute:
step one, preparing an alkaline washing cleaning agent with the pH value of 12:
2% of alkali liquor: na (Na)2CO3:Na(PO4)3＝1:2；
0.2% pH adjuster: KOH;
0.05% dispersant: polyacrylic acid;
0.01% surfactant: sodium lauryl sulfate;
0.15% chelating agent: nitrilotriacetic acid;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an alkaline washing and cleaning box; starting a cleaning pump, injecting an alkaline cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to be 30 ℃, controlling the flow rate of a cleaning solution to be 0.1m/s, circularly cleaning for 1h, soaking for 30min, and repeatedly cleaning and soaking for 3 times;
step two, after the alkaline cleaning is finished, washing the system by using reverse osmosis produced water until the pH value is close to 7;
step three, preparing an acid washing cleaning agent with the pH value of 2.5:
5% acid solution: citric acid;
0.5% pH adjuster: h2SO4；
0.03% surfactant: sodium sulfamate;
0.1% chelating agent: nitrilotriacetic acid;
0.05% reducing agent: sodium erythorbate;
0.15% of a bactericide: dodecyl dimethyl benzyl ammonium chloride;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an acid washing and cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to be 30 ℃, controlling the flow rate of a cleaning solution to be 0.15m/s, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 3 times;
step four: after the acid wash was completed, the system was flushed with reverse osmosis produced water to a pH of approximately 7.
Example 5:
a method for cleaning reverse osmosis calcium sulfate scale comprises the following steps of proportioning raw materials according to mass fraction of solute:
step one, preparing an alkaline washing cleaning agent with the pH value of 12:
2% of alkali liquor: na (Na)2CO3:Na(PO4)3＝1:2；
0.3% pH: a regulator (KOH;
0.1% dispersant: polyethylene glycol;
0.03% surfactant: sodium sulfamate;
0.2% chelating agent: EGTA dipotassium salt;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an alkaline washing and cleaning box; starting a cleaning pump, injecting an alkaline cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 40 ℃, controlling the flow rate of a cleaning solution to be 0.15m/s, circularly cleaning for 1h, soaking for 30min, and repeatedly cleaning and soaking for 3 times;
step two, after the alkaline cleaning is finished, a reverse osmosis produced water is used for flushing the system until the pH value is close to 7;
step three: preparing a pickling cleaner (pH 2):
8% acid solution: glycolic acid: 1:1 of citric acid;
0.4% pH adjuster: HCl;
0.02% surfactant: sodium dodecyl sulfate;
0.15% chelating agent: EDTA disodium salt;
0.04% reducing agent: sodium erythorbate;
0.1% of a bactericide: isothiazolinone;
fully dissolving the mixture by reverse osmosis produced water, and placing the mixture in an acid washing and cleaning box; starting a cleaning pump, injecting a pickling cleaning agent into the reverse osmosis membrane system, adjusting the water temperature to 40 ℃, controlling the flow rate of a cleaning solution to be 0.2m/s, circularly cleaning for 1h, then soaking for 2h, and repeatedly cleaning and soaking for 3 times;
step four: after the acid wash was completed, the system was flushed with reverse osmosis produced water to a pH of approximately 7.
TABLE 1 evaluation tables of cleaning effect of examples 1 to 5
Figure BDA0002309576100000061
The calcium sulfate scale removal rate can reach 98.8 percent, the differential pressure of the first stage and the second stage of reverse osmosis is reduced by 46 percent and 62.5 percent, the desalination rate is improved to more than 98 percent, and the water production flow is improved by 44 percent.

Claims (10)

1.一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于，包括：碱洗清洗剂和酸洗清洗剂，所述的碱洗清洗剂由下述按溶质质量分数配比的原料制得：0.5％-2％碱液、0.2％-0.4％pH调节剂、0.05％-0.15％分散剂、0.01％-0.03％表面活性剂、0.05％-0.2％螯合剂、余量为反渗透产水；所述的酸洗清洗剂由下述按质量分数配比的原料制得：2％-10％酸液、0.3％-0.5％pH调节剂、0.01％-0.03％表面活性剂、0.05％-0.25％螯合剂、0.02％-0.05％还原剂、0.05％-0.2％杀菌剂，余量为反渗透产水。1. a calcium sulfate scale cleaning agent for reverse osmosis membrane, is characterized in that, comprises: alkali cleaning cleaning agent and acid cleaning cleaning agent, and described alkali cleaning cleaning agent is made by the following raw material by solute mass fraction proportioning Obtained: 0.5%-2% lye, 0.2%-0.4% pH regulator, 0.05%-0.15% dispersant, 0.01%-0.03% surfactant, 0.05%-0.2% chelating agent, the balance is reverse osmosis product Water; the pickling cleaning agent is prepared from the following raw materials in proportion by mass fraction: 2%-10% acid solution, 0.3%-0.5% pH regulator, 0.01%-0.03% surfactant, 0.05% -0.25% chelating agent, 0.02%-0.05% reducing agent, 0.05%-0.2% bactericide, and the balance is reverse osmosis product water. 2.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的碱液为Na2CO3和Na(PO4)3以1:2比例配制。2. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: described lye solution is Na 2 CO 3 and Na(PO 4 ) 3 prepared in a ratio of 1:2. 3.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的酸液为柠檬酸、羟基乙酸、甲酸、氨基磺酸中的一种或几种。3. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: described acid solution is one or more in citric acid, glycolic acid, formic acid, sulfamic acid . 4.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的碱洗清洗剂中的pH调节剂为氢氧化钠、氢氧化钾中的一种；所述的酸洗清洗剂中的pH调节剂为盐酸、硫酸中的一种。4. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: the pH regulator in the described alkaline cleaning cleaning agent is a kind of in sodium hydroxide, potassium hydroxide ; The pH regulator in the described pickling cleaning agent is a kind of hydrochloric acid and sulfuric acid. 5.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的分散剂为聚乙二醇、聚丙烯酸的其中一种或几种；所述表面活性剂为十二烷基磺酸钠、十二烷基苯磺酸钠、十二烷基硫酸钠、氨基磺酸钠、脂肪醇聚氧乙烯醚中的一种或几种。5. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: described dispersant is one or more of polyethylene glycol, polyacrylic acid; The active agent is one or more of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium sulfamate, and fatty alcohol polyoxyethylene ether. 6.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的螯合剂为乙二胺四乙酸二钠盐(EDTA二钠盐)、乙二胺四乙酸四钠盐(EDTA四钠盐)、乙二醇二乙醚二胺四乙酸二钾盐(EGTA二钾盐)、氨基三乙酸中的一种或几种。6. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: described chelating agent is ethylenediaminetetraacetic acid disodium salt (EDTA disodium salt), ethylenediamine One or more of tetrasodium tetraacetic acid (EDTA tetrasodium salt), ethylene glycol diethyl ether diamine tetraacetic acid dipotassium salt (EGTA dipotassium salt) and aminotriacetic acid. 7.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述还原剂为异抗坏血酸钠；所述杀菌剂为异噻唑啉酮、十二烷基二甲基苄基氯化铵中的一种或几种。7. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: described reducing agent is sodium erythorbate; Described bactericide is isothiazolinone, dodecyl dimethacrylate One or more of methylbenzylammonium chloride. 8.根据权利要求1所述的一种针对反渗透膜的硫酸钙垢清洗剂，其特征在于：所述的碱洗清洗剂的pH为10-12，酸洗清洗剂的pH为2-4。8. a kind of calcium sulfate scale cleaning agent for reverse osmosis membrane according to claim 1, is characterized in that: the pH of described alkali cleaning cleaning agent is 10-12, and the pH of acid cleaning cleaning agent is 2-4 . 9.一种针对反渗透膜的硫酸钙垢的清洗方法，其特征在于，包括下列步骤：9. a cleaning method for the calcium sulfate scale of reverse osmosis membrane, is characterized in that, comprises the following steps: 步骤一、配制碱洗清洗剂，用反渗透产水充分溶解，置于碱洗清洗箱；开启清洗泵，将碱洗清洗剂注入反渗透膜系统内，调节水温，控制清洗液流速，循环清洗1h后浸泡30min，重复清洗和浸泡2-3次；Step 1: Prepare an alkaline cleaning agent, dissolve it fully with reverse osmosis product water, and place it in an alkaline cleaning tank; turn on the cleaning pump, inject the alkaline cleaning agent into the reverse osmosis membrane system, adjust the water temperature, control the flow rate of the cleaning solution, and cycle cleaning After 1h, soak for 30min, repeat cleaning and soaking 2-3 times; 步骤二、碱洗结束后，用反渗透产水冲洗系统，至pH接近7；Step 2. After the alkali washing is completed, the system is flushed with reverse osmosis product water until the pH is close to 7; 步骤三、配制酸洗清洗剂，用反渗透产水充分溶解，置于酸洗清洗箱；开启清洗泵，将酸洗清洗剂注入反渗透膜系统内，调节水温，控制清洗液流速，循环清洗1h后浸泡2h，重复清洗和浸泡2-3次；Step 3: Prepare a pickling cleaning agent, fully dissolve it with reverse osmosis product water, and place it in a pickling cleaning tank; turn on the cleaning pump, inject the pickling cleaning agent into the reverse osmosis membrane system, adjust the water temperature, control the flow rate of the cleaning liquid, and cycle cleaning After 1h, soak for 2h, repeat cleaning and soaking 2-3 times; 步骤四、酸洗结束后，用反渗透产水冲洗系统，至pH接近7。Step 4. After the acid washing is completed, the system is flushed with reverse osmosis product water until the pH is close to 7. 10.根据权利要求9所述的一种针对反渗透膜的硫酸钙垢的清洗方法，其特征在于：所述的步骤一中水温30-45℃，清洗液流速0.1m/s-0.2m/s；步骤三中水温在30-45℃，清洗液流速0.15m/s-0.3m/s。10. A cleaning method for calcium sulfate scale of reverse osmosis membrane according to claim 9, characterized in that: in the step 1, the water temperature is 30-45°C, and the cleaning liquid flow rate is 0.1m/s-0.2m/ s; in step 3, the water temperature is 30-45° C., and the flow rate of the cleaning liquid is 0.15m/s-0.3m/s.
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