SU929589A1 - Method of preparing silicate-containing flocculant - Google Patents

Description

The invention relates to the treatment of natural wastewater, in particular to the preparation of flocculants, and can be used in the clarification of water in public utilities, heat and power engineering and the chemical industry. A known method of purification of water with the help of aluminum sulphate and ferric chloride on the subsequent magnetic treatment of water ll. However, this method is effective for waters of medium turbidity. The closest to the invention in technical essence and the achieved result is the method of preparing a solution of silicate-containing phosphate by treating a solution of sodium silicate with an air-chlorine mixture followed by holding the solution for 0, 54 hours, diluting with water and introducing the resulting sol into purified water 2. However, the known method has insufficient water clarification. In addition, the method requires a large consumption of an activating agent, the shelf life of stabilized sol is limited (up to 24 hours). This leads to the use of large-sized installations, which makes it difficult to use jars and reduces its power. The purpose of the invention is to increase the degree of water clarification. This goal is achieved by the fact that the activation is carried out with a solution containing anodisoluble iron, followed by treatment with a magnetic field, with a strength of 1, 5 "1O A / M and exposure. Moreover, anodic dissolved iron is introduced in the amount of 0, ОО44, 6 mg / l flocculant. In preparing the solution of phpokul nta, biphylene iron formed by the anodic dissolution of the metal is used. When ferric iron (Te) is used to dissolve sodium silicate solution in the form of a% solution of FeCtj ulu yienve, no flocculating properties of active silica gel are observed. PRI im p A solution of sipcate-containing phiokulta (0.75% active silicic acid) is prepared in water containing anodic-dissolved iron in an amount of 0, OO4-0.6 mg / l flocculus (SiOz) followed by treating the solution with a magnetic field with a strength of 1 5-.13.510 A / M, the source water is treated with the following) of composition J ;. Total hardness, mEq / l 5.8-6.2 Alkalinity, mEq / l3.4-5.0 Suspended substances, mg / l 185 Chroma, grad75, 1 Water temperature, C 2.5-15.4 V 5OO ml of water are pre-administered with 120 mg / l of aluminum sulphate (in combination), and then after 60 s are treated with a 0.75% active solution of silicic acid in the amount of 4.3 mg / l (the fraction of silicate - 15% of the anhydrous dose and settle for 6 and 36 minutes, which corresponds to the deposition of coagulated suspension with a hydraulic size of 1.2 and 0.2 mm / s and more. After settling, samples of the volume of 10 ml are taken from the upper part of the cylinder, in which the suspended substances and chromaticity are determined. To evaluate the effectiveness of the proposed method, a comparison is made with a known method in which a solution of active silicic acid is prepared by treating a sodium silicate solution with a 1: 1 mixture of air and a mixture, and the prepared solution is released 3.5 hours dp of purchasing properties, the matured aol is diluted water up to about 7–5% for stabilization and dosage into treated water. The obtained results of the influence of the magnetic field intensity on the indicators of water clarification are presented in the table (average results from 3-4 studies), where the effect of the proposed method of preparing silicate-containing flocculant is shown by comparison with the known method. The data in the table shows that the improvement in the clarification rates is most pronounced with a magnetic field strength of 1.5 A / M at a water clarification temperature of + 2.5-2 ,, 10.5-10 A / M at a temperature of clarified water 16 ,9-. 7, I13,5. - at С 15.115, 4 ° С, i.e. with an increase in the temperature of the clarified water, an increase in the optimal parameters of the magnetic field intensity is observed. It should be noted here that with other intensities large and optimal, a rather high effect is observed, but the costs of electricity for creating larger than optimal magnetic field strengths are higher. The amount of anodic dissolved iron introduced into the vial of nt depends on the content of suspended particles and the color of the source water. So, when clarified on low turbid and colored waters, the optimum content of anode-dissolved iron is O, O04-O, O18 mg / l, and for average turbidity and water color it is 1, O5-4.6 mg / l flocculant. According to the norms, the content of suspended substances in clarified water is allowed no more than 2-3 mg / l, color not more than 2 degrees. These indicators of clarification are reached during sedimentation of a suspension within 36 mVD, which corresponds to the rules of technological analysis of water for sedimentation of a suspension with a hydraulic size of 0.2 mm / s and more. From the data in the table, it follows that diluting the sodium silicate solution with water containing anodisoluble iron, followed by treating the resulting solution with magnetic pore, can improve the quality indicators of water clarification by 10-35%. The method of preparing a solution of silicate-containing phpool nta has the strongest effect on the intensification of suspension clarification with a hydraulic size of 0.2 mm / s, i.e. on the most melkuna and laborious suspension. In addition, the results show the possibility of reducing flocculant decomposition with the proposed method of preparing a solution of it without degrading the quality of clarified water. The technical and economic efficiency of the method is achieved by reducing flocculant consumption by 15-25% to obtain clarified water of the required quality and reducing the number of production areas required for the reagent utilization of the sewage treatment plant, by reducing the dimensions of the individual reagent supply facilities. The cost of clarified water, on average, 15-20% lower than that of the known method.

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Claims (2)

CD 9. 92 Claims of the invention 1. A method for preparing silicate-containing flocculant, including activation and aging, is also distinguished by the fact that, for the purpose of drinking the degree of clarity, actuation is made with a solution containing dissolving iron followed by treatment with a magnetic field -13,510 A / M, 2. Method pop.1, I distinguish. y and with the fact that the anodically dissolved iron 9O is introduced in the amount of 0.0044, 6 mg / l flocculate. Information sources, . Taken into account ori expertise 1. Babenkov E. D, Ochista water coagulum. Science, 1977, p. 278279. 2. Slipchenko, V.A., Kulsky, L.A., Technologists of the Silicon Acid Tilting Sols in Water-borne Powders. Water supply in sanitary equipment 1968, No. 7, p. 7-8.