SU1594146A1 - Method of purifying waste water from petroleum products - Google Patents

Abstract

The invention relates to the treatment of industrial wastewater by flotation using collector reagents, in particular to the treatment of wastewater from oil products and surfactants in the petrochemical industry. The aim of the invention is to increase the degree of purification of wastewater containing no more than 1% emulsol while reducing its cost, which is achieved by pretreatment with salts of primary aliphatic amines of the general formula [С NH 2N + 1NH 3] CL - where N = 13-16, and lignin-tall composition - waste pulp and paper industry, esterified with diethanolamine followed by flotation of the solution. Collecting reagents are introduced in a total amount of 0.26-0.50 mg / l with a component ratio of 1.00: 0.04-1.00. The method allows to increase the degree of purification of emulsol-containing wastewater from 81% to 97

5% compared with the known method, as well as reduce the consumption of the collector and reduce the cost of the cleaning process. 2 tab.

Description

The invention relates to the treatment of industrial wastewater by flotation, in particular to the treatment of industrial wastewater from petroleum products and surfactants-, and can be used in the refining, petrochemical and metallurgical industries.

The aim of the invention is to increase the degree of wastewater treatment while at the same time reducing the cost of the cleaning process by reducing the consumption of reagents.

To implement the proposed method of treating wastewater containing not more than 1% emulsol, the treatment is carried out with a mixture of cationic surface active substances (surfactant) in an amount of 0.26-0.5 mg / l. The mixture consists of salts of primary aliphatic amines with a hydrocarbon length radical n 13-16 (ANP) and a lignin-tall composition esterified with diethanolamine (LTCD), taken in a weight ratio of 1.0: 0.04-1.0.

LTCD is a condensation product of a chlorhydrin derivative of a lignin-tall composition that is a large tonnage waste of pulp and paper

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Last filed and diethanolamine with the following composition, wt.%:

Alkylolamides 20-40

Lignin7-12

Mineral salts 1-5

Diethanolamine. . 20-40

Neutral

substances rest

The ratios of the reagents in the mixture, with their total concentration in the range of 0.26-0.5 mg / l, ensure the wastewater treatment from the residual concentration of petroleum products acceptable for their reuse in concrete manufacturing technology (10-15 mg / l)

. After the implementation of the dxnotation process, the treated wastewater is returned to the process,

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and the extracted product steamed forms.

EXAMPLE 1 Model wastewater containing 0.3 g / l of emulsol in a dispersed state, in an amount of 0.2 l, is successively treated with 0.5 ml of a 0.01% aqueous solution of ANP and 0.02 ml of 0.005% aqueous solution of LTCD.

The ratio of ANP and LTCD 1.0: 0.02. The total amount of reagents added with respect to wastewater is 0.255 mg / l. The mixture is shaken for 1-2 minutes, then transferred to a flotation cell. The flotation process is carried out for 10-30 minutes.

PRI mme R 2. Wastewater containing 0.3 g / L of emulsol is successively treated with 0.5 ml of a 0.01% aqueous ANP solution and 0.04 ksh of a 0.005% aqueous solution of LTCD. The ratio of ANP and LTCD is 1.0: 0.04. The total concentration of scavenger is 0.26 mg / l.

PRI me R 3, Waste water containing 0.3 g / l of emulsol is successively treated with 0.5 ml of a 0.01% aqueous solution of ANP and 0.08 ml of a 0.005% solution of LTK-D. Ratio. Kie ANP and LTKD 1,, 0: 0.08. The total concentration of the collector is 0.27 mg / l.

PRI me R 4. Wastewater, co. containing 0.3 g / l of emulsol, they are treated with 0.5 ml of 0.01% aqueous solution of ANP and 0.20 ml of 0, an aqueous solution of LTCD, the ratio of ANP and LTCD, 1.00: 0.2, Total collector concentration 0.3 mg / l.

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PRI me R 5. Wastewater containing 0.3 g / l of emulsol is treated with 0.5 ml of a 0.01% aqueous solution of ANP and 0.4 ml of a 0.005% aqueous solution of ltcd. The ratio of ANP and -LTKD 1.0: 0.4. Total collector concentration of 0.35 mg / l.

PRI me R 6. Waste water containing 0.3 g / l of emulsol is treated with 0.5 ml of 0.01% aqueous solution of ANP and 0.5 ml of 0.005% aqueous solution of LTCD, the ratio of ANP and LTKD, 5. The total concentration of the collector is 0.375 mg / l.

PRI me R 7. Wastewater containing 0.3 g / l of emulsol is treated with 0.5 ml of a 0.01% APP solution and 0.6 ml of a 0.005% LTCD solution. The ratio of ANP and LTCD is 1.00: 0.6. The total concentration of the collector is 0.50 mg / l.

P. r. And mera 8. Wastewater containing 0.3 g / l of emulsol is treated with 0.5 ml of 0.01% aqueous solution of ANP and 1.0 ml of 0.005% aqueous solution: LTCD . The ratio of ANP and LTCD is 1.0: 1.0. The total concentration of the collector is 0.50 mg / l.

Example 9. Waste water, containing 0.3 g / l of emulsol, is treated with 0.5 ml of p, 0.1% aqueous solution of ANP and 1.2 ml of 0.005% solution of LTCD. The ratio of ANP: ltcd 1.0: 1.2. The total concentration of the collector is 5 0.55 mg / l.

The results of the experiments are given in table. 1.

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Example 10. Wastewater containing 0.5 g / l of emulsol is treated with 0.5 ml of 0.01% aqueous solution of ANP and 0.6 ml of 0.005% solution of LTCD. The ratio of ANP and LTCD is 1.0:: 0.6. Sumarine concentration collects 0.40 mg / l.

Example 11 Wastewater, with a concentration of 0.1 g / l of emulsol, is treated as in example 10.

Example 12. Waste water containing 0.2 g / l of emulsol is treated as in example 10,

Example 13 Wastewater containing 0.6 g / l of emulsol is treated as in Example 10.

Example 1-4. Wastewater, . containing 9.9 g / l of emulsol, treated according to example 10,

The results of the experiments are given in table 2.

When treating the emulsion with a mixture of cation collectors (salts of primary aliphatic emines and a ligno-tagging composition esterified with diethanolamine) in a certain ratio of 1.0: 0.04-1.0, a good separation effect of emulsion-containing sewage up to 97 is achieved. ,five%. The total concentration of surfactants used does not exceed the consumption in the amount of 0.5 mg per 1 liter (or 0.5 g per 1 m) of the treated wastewater. A further increase in the content of the precipitating reagent does not lead to a significant increase in the eff. cleaning efficiency, which determines the upper limit of the claimed limit.

The data allows to determine the concentration limits of applicability of the proposed method, i.e. The initial concentration of emulsol in the treated wastewater should not exceed 1%.

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fines for wastewater treatment, and — also the use of less scarce and more: - cheap reagents — gfn collectors — simultaneously reducing the consumption of rehtoB,

Claims (1)

Invention Formula A method of purifying waste water from petroleum products, including treating with cationic collector reagents followed by flotation, characterized in that, in order to increase the degree of purification while simultaneously reducing the cost of the process by reducing the consumption of reagents, collector reagents are used salts of primary aliphatic 20 amines of the general formula, where n 13-1b, and lignin-tall composition. - waste of pulp and paper industry, esterified with diethanolamine, at their ratio Use of the proposed method - 25 1.00: 0.04 - 1.00, and the reagents — cleaning emulsion-containing 1x waste collectors — are introduced sequentially from flowing water, providing a comparison of the total value of their concentrations with a known method; 50 mg / l, Table 1 fines for wastewater treatment, and — also the use of less scarce and more: - cheap reagents — gfn collectors — simultaneously reducing the consumption of rehtoB, Invention Formula A method of purifying waste water from petroleum products, including treating with cationic collector reagents followed by flotation, characterized in that, in order to increase the degree of purification while simultaneously reducing the cost of the process by reducing the consumption of reagents, collector reagents are used salts of primary aliphatic amines of the general formula, where n 13-1b, and lignin-tall com Emulsol concentration, g / l 0.9 0.6 0.3 0.2 0.1 0.05 Table 2 Release rate,%  76.21 96.90 97.10 96.73-. 95.10 95.70