SU729128A1 - Method of purifying water from suspended particles by flocculation - Google Patents

Description

(54) METHOD OF WATER SPOTS FROM SUSPENDED SUBSTANCES

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The invention relates to methods for purifying water from suspended substances and can be used in the chemical industry in the production of phosphate mineral fertilizers.

Sewage clarification plants of chemical plants are widely used in septic tanks t.

The disadvantage of this method is the length of the purification process, the possibility of using it at low flow rates, or occasional discharge of wastewater.

Closest to the proposed invention, the method of wastewater treatment using flocculation using polyacryl MIDA 2 as flocculant.

However, the disadvantages of the flocculant used are the duration of dissolution (26 hours), which necessitates the use of high-speed agitators (n 600-800 rpm), high adhesion to the container, corrosion of ferrous metals pipelines. In addition, at temperatures below 0 ° C and above 30 ° C, polyacrylamide reduces its activity.

The purpose of the invention is to reduce electricity costs by reducing the dissolution time of the flacculon.

For this purpose, polydimethlaminostoschmetacrythat is used as flocculant.

The proposed flocculating agent is polymethacrylic acid amino acid and refers to a group of e-cationic flocculants.

Example. Sewage production

10 phosphate mineral fertilizers with a weighed content of 300–1000 mg / l are fed into a settling tank, to which simultaneously prepared floc nt - polydimethylamine ethyl methyl acrylate (0.1% solution) is fed in the amount of

15 10 mg / l.

With a shaking rate of precipitation of 5, 8 m / h and a flocculation amount equal to W mg / l, the content of suspended solids in purified water of the prototype is 30 mg / l. and according to the previous method, 28 mg / l.

Conditions for dissolving in water 0.1% -HOi-o flocculate solution are listed in the table.

The use of the proposed flocculate polydimethylaminoethyl methacrylate allows reducing the flocculation time in water by 100–200 times, eliminating the need for high speed agitators, saving energy and thereby significantly simplifying the process of wastewater treatment.

In addition, the proposed flowulant nt does not cause corrosion of pipelines from ferrous metals, as a result of which there is no need to protect them.

Claims (2)

1. Proskurkov V. A., Schmidt L. I. Wastewater treatment in the chemical industry. M 1977. P.48. 2. Proskurkov V. A., Schmidt L. I. Wastewater treatment in the chemical industry. M., 1977, p. 122.