SU1723046A1 - Method of purification of natural water and sewage - Google Patents

Abstract

Use: preparation of reagents for cleaning. The essence of the invention: during the purification of natural and waste waters, aluminum containing coagulant, polyacrylamide and lime solution is introduced, which, before introduction, is sequentially treated with a magnetic field, ultrasonic frequency of 1.5-12.5 kHz for 0.5-5, 0 min and electrocoagulation using iron electrodes. 1 h. N. f-ly, 1 tab.

Description

The invention relates to the preparation of reagents for the purification of natural and waste waters, namely the activation of lime solutions used in wastewater treatment plants of municipal and industrial water supply and sewage.

The purpose of the invention is to increase the degree of purification from cutting fluids and reduce the consumption of reagents.

The method is carried out as follows.

Sewage water containing coolant is treated with a solution of coagulant, polyacrylamide and lime solution, which is sequentially treated with a magnetic field before being introduced into the water, using ultrasound at a frequency of 1.5-12.5 kHz for 0.5-5.0 minutes and electrocoagulation . In this case, the treatment of the latter is carried out at a magnetic field strength of 12.5x103 A / m. and electrocoagulation using iron electrodes.

Example 1. Purification is subjected to waste water containing coolant: pH 7.6; total hardness 4.4 meq / l; Coolant 85.6 g / l; temperature 13.5 ° C.

The investigated waste water is treated with a solution of coagulum aluminum sulfate in the amount of 355 g / l (A content) 20–14.6%), polyacrylamide solution in the amount of 52.3 g / l (active polymer content 8%) and lime mortar in the amount of 43, 5 g / l in terms of CaO in cylinders 432 mm high with a conical bottom and stand for 36 min, which corresponds to the deposition of a coagulable suspension with a hydraulic size of 0.2 mm / s and more, then water samples are taken from the upper part of the cylinder volume of 100 mm, in which the content of the coolant is determined.

Example 2. Sewage water, similar to that described in example 1, is treated with a solution of aluminum sulphate, PAA and lime mortar subjected to impacts (L

WITH

vj yu about

four

magnetic field of 12.5xU3A / m.

The process control of water treatment is carried out as described in Example 1.

Example 3. Sewage water similar to that described in Example 1 is treated with a solution of aluminum sulphate, PAA and lime solution subjected to electrocoagulation with an anode current density of 4.5 A / dm2. The process control of water treatment is carried out as described in Example 1.

Example 4. Sewage water similar to that described in Example 1 is treated with a solution of aluminum sulphate, PAA and lime mortar exposed to a magnetic field of 12.5 x 103 A / m and electrocoagulation with an anode current density of 4.5 A / dm

The process control of water purification is carried out as described in Example 1.

Example 5. Sewage water, similarly to that described in example 1, is treated with a solution of hm of aluminum sulphate, PAA and lime mortar subjected to ultrasound. The process control of water treatment is carried out as described in Example 1.

Example 6. Sewage water, similar to that described in example 1, is treated with a solution of aluminum sulphate, PAA and lime mortar, subjected to magnetic treatment, then the effect of ultrasound with a frequency of 1.5-12.6 kHz for .0.5-5 min, after which the solution is electrocoagulated. The process control of water treatment is carried out as described in Example 1.

Example 7. Sewage water, similar to that described in example 1, is treated with a solution of aluminum sulfate, PAA in the amount of the same as in example 1, and lime mortar with a 45% reduction in dose. The latter is exposed to magnetic field, ultrasound and electrocoagulation as in Example 6. The process control of water purification is carried out as described in Example 1.

The results obtained are presented in the table (average results from 3-5 studies), where the effectiveness of the proposed method of preparing lime mortar is shown in comparison with the known method, with the results of the control experiment taken as 100%.

From the data given in the table, it follows that ultrasonic treatment of solutions after their magnetic treatment, followed by electrocoagulation, makes it possible to improve the quality of wastewater treatment, which provides an average 1.8-fold reduction of coolant in clarified water both in comparison with the usual (control experiment) and water clarification using known technological methods.

In addition, the results show the possibility of reducing the consumption of lime mortar on the proposed

0 method (example 7) without degrading the quality of waste water.

Thus, the use of the proposed method in comparison with the known allows improving the quality of cleaning for

5 due to coagulating properties, this improves the quality of water purification and reduces the consumption of reagent by 30-45% with obtaining water of the required quality, and also reduces the need for the production areas required for reagent utilization of treatment facilities, reduces the size of individual reagent supply facilities cost and cost of water purification on average by 30-35%.

five

Claims (2)

1. The method of purification of natural and waste waters, including the introduction of aluminum-containing coagulant, polyacrylamide and 0 lime solution, followed by settling, characterized in that, in order to increase the degree of purification from lubricant-cooling liquids and reduce reagent consumption, prior to the introduction, the lime solution is successively treated with a magnetic field, using ultrasonic frequency of 1.5-12.5 kHz 0.5-5.0 min and electrocoagulation. 2. The method according to claim 1, which is based on the fact that the treatment is carried out at a magnetic field strength of 12.5 10 A / m, and electro-coagulation using iron electrodes. One floor I 2.5 x103, a / m