Scale inhibitor combination, preparation method thereof and sewage treatment method

[0016] The preparation method of the scale inhibitor composition provided by the invention comprises mixing the phosphorus-containing small molecule organic scale inhibitor, polymer scale inhibitor, flocculant, water-soluble inorganic zinc salt and water.

[0017] Wherein, the mixing method includes dissolving the flocculant in water, adding water-soluble inorganic zinc salt, mixing evenly, and then mixing the obtained solution with phosphorus-containing small-molecule organic scale inhibitor and polymer scale inhibitor.

[0018] After the flocculant is dissolved in water and the water-soluble inorganic zinc salt is added, the mixing conditions may include stirring at a temperature of 0-100°C for 1-8 hours, preferably stirring at a temperature of 20-80°C for 2-6 hours. During the process of adding the water-soluble inorganic zinc salt, the pH is controlled to be 1-7, preferably 2-6. The pH can be adjusted with conventional soluble inorganic and/or organic acid and alkali solutions, for example, the acid solution can be one or more of the aqueous solutions of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid or acetic acid. The alkaline solution may be one or more of sodium hydroxide, potassium hydroxide, sodium silicate, potassium silicate, ammonia water or an aqueous solution of ethanolamine, diethanolamine, triethanolamine, ethylenediamine, and polyethylenepolyamine.

[0019] Preferably, the method of adding the water-soluble inorganic zinc salt includes first dissolving the water-soluble inorganic zinc salt in water to form a solution, and then adding the solution to the solution formed by dissolving the flocculant in water.

[0020] The method of mixing the obtained solution with the phosphorus-containing small molecule organic scale inhibitor and the polymer scale inhibitor can be a conventional method, such as stirring, preferably, stirring for 1-6 hours

[0021] The amount of the phosphorus-containing small molecule organic scale inhibitor, polymer scale inhibitor, flocculant, inorganic zinc salt and water is, based on the total weight of the scale inhibitor composition, the phosphorus-containing small molecule organic scale inhibitor The content of antiscalant is 1-15% by weight, preferably 5-10% by weight; the content of polymer scale inhibitor is 1-25% by weight, preferably 5-23% by weight; the content of flocculant is 0.1-15% by weight , preferably 0.5-10% by weight; the content of inorganic zinc salt is 1-30% by weight, preferably 10-25% by weight; the content of water is 15-96.9% by weight, preferably 32-79.5% by weight.

[0022] The sewage scale inhibition treatment method provided by the invention includes adding the scale inhibitor composition provided by the invention to the sewage before the sewage is treated or during the sewage treatment process.

[0023] Wherein, 100-250 grams of the scale inhibitor composition is added to every 1 ton of sewage.

[0024] The oil content of the sewage can be 0.1-150 mg/L, and the COD is 0.1-300 mg/L.

[0026] Example 1

[0027] 13 grams of polyaluminum chloride (Gongyi Yujie filter material factory) was added to a 200 milliliter beaker, 25 milliliters of deionized water was added to dissolve it, and 18 grams of zinc chloride (Beijing Chemical Plant) was added under agitation. During the process, a hydrochloric acid solution with a volume concentration of 10% is used to control the pH to be 2-6. After the zinc chloride is completely dissolved, add water to make the total amount of the solution reach 100 grams, take 70 grams of it and place it in a 200ml beaker, add 9 grams of HEDP and 21 grams of acrylic acid-2-acrylamido-2'-methylpropylsulfonate Acid copolymer (Beijing Linhua Water Quality Stabilizer Factory, ZF329LH), stirred, dissolved and mixed to obtain scale inhibitor composition D1. The prepared scale inhibitor composition was transferred to a 150ml ground-mouth Erlenmeyer flask and stored at room temperature until use.

[0028] Example 2

[0029] Weigh 18 grams of zinc chloride and dissolve in 20 milliliters of deionized water for later use. Under the condition of 80 DEG C, get 20 grams of 50% aluminum sulfate solution in the there-necked flask with stirrer, thermometer, first drop 5 grams of phosphoric acid, then add dropwise the above-mentioned zinc chloride solution and 25 grams of sodium silicate solution ( The mass concentration is 3.24%). During this process, the pH value of the solution is controlled to be 1-7, and deionized water is added to make the total amount of the solution reach 100 grams, and stirred for 2 hours. Take 70 grams of it in a 200ml beaker, add 9 grams of HEDP and 21 grams of acrylic acid-2-acrylamide-2'-methylpropylsulfonic acid copolymer (Beijing Linhua Water Quality Stabilizer Factory, ZF329LH) respectively, and stir to dissolve After mixing, the scale inhibitor composition D2 is obtained. The prepared scale inhibitor composition was transferred to a 150ml ground-mouth Erlenmeyer flask and stored at room temperature until use.