SU1126545A1 - Method for clarifying waste liquors from phosphorus fertilizer production - Google Patents

Abstract

1. METHOD OF LIGHTING OF WASTE WATER OF PRODUCTION OF PHOSPHOROUS FERTILIZERS, including their neutralization and the subsequent introduction of a chemical reagent. So that, in order to accelerate the process of clarification, polymerized and saponified are introduced as chemical reagent in an aqueous-alcoholic medium in the presence of sodium bisulfate cubo. nitrilacrylic acid residue. 2. The method according to claim 1, about tl and h and y and with that, that the polymerized and saponified in an aqueous-alcoholic medium in the presence of bisulfate sodium. Double octaTOK nitryl acrylic acid is introduced in the amount of 1-1СГ l -lOWc.%.

Description

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The invention relates to the clarification of wastewater and the separation of particles from liquid and can be used in the treatment of wastewater from the production of phosphate fertilizers.

A known method of purification of waste water from suspended particles with the use of aluminum-containing coagulant, followed by separation of the coagulated suspension by sedimentation and filtration l.

The disadvantage of the method is the complexity of the process, namely, that the coagulant is introduced in excess in two stages — in the first 100% and 3050% in the second stage before filtering.

The closest to the proposed technical essence and the achieved result is a method of clarifying wastewater production of phosphate fertilizers, according to which the wastewater is neutralized with lime milk, is treated with 0.5% polyacrylamide solution (PYA). At a flow rate of 0.5% -Log PAA solution for 1 ms of suspension equal to 0.5 l () or 2 l (T: W 1: .30) solids deposition rate reaches 0.8-1.2, m / h.

Thus, the dose of PAA per 100% product is 0.020, 3% by weight of the solid phase of the suspension.

The disadvantage of this method is the low rate of clarification.

The purpose of the invention is to accelerate the process of clarifying wastewater production of phosphate fertilizers.

This goal is achieved by introducing polymerized and saponified sulphate into an aqueous-alcoholic medium in the presence of sodium bisulfate of the bottom residue of nitrilacrylic acid into the waste water after neutralizing it as a chemical reagent.

Preferably, said reagent is administered in an amount of 110 1 10 May. %

The method is carried out as follows.

Wastewater obtained in the production of nitrogen-phosphate fertilizers and containing, g / l: RuOS 0,2-2,5; F 0.01-0.3; Ca2 + 0.1-0.5; C1 0.01-3.5, at pH 1.0-4.0 is subjected to neutralization with milk of lime to a pH of 6, 5-8,

At the same time, phosphates and calcium fluorides precipitate in the solid phase, partially remaining in solution within their solubility.

To clarify wastewater treated with milk of lime, a 0.3% aqueous solution of polymerized and saponified in a hydroalcoholic medium in the presence of bottom bisulfate in an amount of 0.1-10 g, which is IlO 1 "10 wt%, is introduced, and stirred for 5 minutes. The solid phase separation is carried out in glass cylinders with an auxiliary millimeter scale. The time of spinning is determined by the interface between the solid and liquid phases.

Polymerized and saponified in an aqueous-alcoholic medium in the presence of sodium bisulfate, the bottom residue 0 of nitrilacrylic acid has the following composition, wt%:

Nitrilacrylic acid (BAK), 60,11

Polymerized NAC 12.66 with Lactonitrile14.70

Water 3.79

Divinylacetylene2,10

Dianbutadiene2,61

Acetaldehyde2., 03

Hydrocyanic acid 2.00 0 The use of the amount of additives for wastewater treatment for the production of phosphate fertilizers, polymerized and saponified in an aqueous-alcoholic medium in the presence of sodium bisulfate 5, sodium nitrite acrylide, contributes to the formation of large and durable flakes.

The experimental results obtained in the implementation of the proposed method, as well as their comparison. With a known method are presented in the table.

As can be seen from the table, the introduction of 5 polymerized VAT residue in an amount less than 110% by weight does not contribute to a noticeable increase in the rate of clarification, since this amount is not enough to form the required amount of floccules.

The introduction of a polymerized VAT residue in an amount greater than.% By weight is impractical, since the rate of clarification is further stabilized.

Example. B400g of waste water of the indicated composition, previously neutralized with lime milk to a pH of 6.5-8.5, is injected in the form of a 0 0.5% aqueous solution polymerized and saponified in an aqueous-alcoholic medium in the presence of sodium bisulfate and the bottom residue of nitrilacrylic acid in an amount of 1 g, which is 5 is 1.,%; the solution is stirred and settled.

The rate of clarification is 2.6-2.8 t / h.

Thus, the rate of clarification of wastewater phosphate fertilizer production by the proposed method is 2-3.5 times higher than that of the known, with a significant reduction of about 10-100 times the input chemical reagent. Prototype (0.5% aqueous solution of Polymerized Pre for ar bottoms (0.5% aqueous solution) PAA 210 3 1.0 10 1.25-10 5,010Г 1,

Claims (2)

1. METHOD FOR LIGHTING WASTE WATER PRODUCING PHOSPHORIC EASY RHENIUM, including their neutralization and subsequent introduction of a chemical reagent., Characterized in that, in order to accelerate the clarification process, a cubic residue of nitrile acrylic acid is introduced into the water-alcohol medium in the presence of sodium bisulfate in order to accelerate the clarification process. 2. A method according to claim 1 of t n and h and w and d w i with .tem, .chto polymerized and saponified in a water-alcoholic medium in the presence of sodium bisulfate bottoms octaTOK nitrile acrylic acid is administered in an amount of 1-1 (July ⁴ 1-10 ' ^g wt.%. KZ about joint venture Joint venture