SU831744A1 - Method of purifying waste water containing furanic compounds - Google Patents

Description

(54) METHOD FOR CLEANING WASTE WATER CONTAINING FURANE COMPOUNDS Duration of cleaning process and insufficiently high degree of purification. The purpose of the invention is to increase the degree of cleaning, reduce the duration of the process and simplify the goal. . Preferably alkylaryl pyridinium chloride is introduced into the wastewater in an amount of 5-500 mg / l. The method is carried out as follows. For the most effective purification, the interaction of alkyl aryl pyridinium chloride with furan compounds should proceed in a weakly alkaline medium, which is created by introducing lime milk into wastewater to pH, then a 1% solution of reagent in the amount of 5-500 mg / l is added, stirred first 1520 s, and then slowly 3-5 minutes to form flakes and defend, within an hour. The content of furan compounds is determined by the chromatographic method. Example 1. Sewage water / volume of 500 MP, containing 99 mg / l of furfural, 115 mg / l of furyl alcohol and 1620 mg / l of suspended substances and having COD of 3650 mg / l 0 neutralized with lime milk to pH 8, then input T 1% solution of alkylarylpyridium chloride in the amount of 100 mg / l. After vigorous stirring for 15–20 s, and then slow (30–30 rpm) for 3–5 min, the solution — with precipitated flakes settled for 1 h. The purification efficiency is 20% for furfural, 17.4% alcohol, 99% for suspended solids, 750% for PCA. Example 2. The process is carried out as in Example 1 at a dose of the reagent of 250 mg / l, 500 mg / l, the purification data being,%: 50.5 ,. 43.5, 99, 87.3 and 99.0, 87.0, 99 and 91.5 respectively. The obtained data on the residual content of impurities and the degree of purification obtained are given in Table 1. Comparison of the purification results for the proposed and known methods for purification of furfural-containing sewage is given in Table 2, from which it follows that the proposed method is simpler than the known method the duration of the process is significantly reduced, the degree of purification is higher. The optimal dose of alkylaryl pyridinium chloride depends on the initial content of furan compounds in the waste water, with a total content of 200 mg / l, the optimal dose is 500 mg / l. Purified water contains furan compounds O, 51 mg / l, suspended solids 1520 mg / l, COD 300-350 mg / l O, which corresponds to 99-99.9% purification from furan compounds and 90-92% COD purification . The technical and economic effect of using alkylarylnidinium chloride for water purification is achieved by reducing the content of toxic components of furanic compounds in purified water, simultaneous purification from furfural, furyl alcohol, suspended solids and most other organic contaminants and cheapening the treatment process. Table 1

Continued table. one

To alkylpyridam and their lichloride in stoichiometric amount to the content of furan compounds1 in the waste water

Normally 15-30 C

Stirring with scoak and rusti 180-370 rpm I for s; 2555 rpm for 3-5 min

Settling for

h hard

Total duration

cycle h

The effectiveness of the process to reduce the content,%

COD

99

90-92

0.5-1.0 does not exceed the maximum permissible value for dumping furfurol into open water bodies

A mixture of Ca (OCl) + Ca (OH) j in a 1.5-fold excess to the content of furan compounds in the waste water

raised 90-100 С

Stirring at 150 rpm for 8 h

Filtration

8 h -K filter cycle time

50

No data available

Furyl alcohol 85-97

25 mg / l exceeds the MPC for the supply of furfural to biological treatment facilities and for discharge into open water bodies.

Formula of invention

Claims (3)

1. A method of treating wastewater containing furanic compounds by the introduction of a reagent is distinguished by the fact that alkylaryl pyridinium chloride is used as a reagent to increase the degree of purification, shorten the process time and manage it. 2. The method according to claim 1, wherein the alkyl aryl pyridinium chloride is introduced into the waste water in the amount of 5-500 mg / l. Sources of information taken into account in the examination 1. Khomkin Yu. Et al. Sorption method for purification of furfural-containing sewage. - Journal of Applied Chemistry 45, 1975, 8, p. 1857-1859. 2. Kuzmitska N.E. et al. Sorption Purification of Waste Water Containing Furan Compounds. Plastics, 1975, 5, p. 57-59, 3.Artemyeva N.A. et al. A method for treating wastewater containing furan compounds. - Hydrolysis of a and wood-chemical industry 1961, 7, p. 15-16.