DE2055860A1 - Waste water purification - from organic contaminants using granulated carbon catalysts esp active carbon - Google Patents

Abstract

Pre-purifying strongly organically contaminated effluents, esp. from chemical or textile industry, pulping and dyeing, is effected with reduced or no sludge deposition by adding a granulated C catalyst, esp. active C, as well as turf coke and/or pumice, to water to be purified, and mixed through with air by means of suitable stirring devices. Before use as catalysts, coal and/or pumice are pref. metal-treated. Pref. catalyst amount used is 2-50 (esp. 2-15) wt.% w.r.t. hourly water throughput. Revolution, aeration, and mixing of the 3 phases is effected esp. with surface ventilators and or flotation stirrers.

Description

Process for the purification of organically polluted water and waste water.

Description: The present invention relates to a method for Purification of organically polluted water and waste water. It refers to the catalytic degradation of organ substances in water.

In the course of industrialization and mechanization, the the most diverse production facilities require ever greater amounts of water.

The output of process and wastewater increases to the same extent, especially in areas with high population and industrial density.

Because in the areas mentioned, the self-cleaning power when the sewage is discharged the receiving water is nowhere near sufficient for the newly introduced dirt and pollutants to reduce in a natural way, one is forced in increasing bass, the accruing To largely pre-purify wastewater from industry and technology.

there have been various proposed procedures for this in the past and designs known and used. (Chemical and biological treatment).

A major disadvantage when using biological cleaning processes is in addition to the accumulation of excess sludge caused by the organic processes and its elimination also the relatively large space required to accommodate the process required structures0 Through the named and described below VerLallren according to the invention should address the well-known disadvantages (space requirement, Chemical costs, sludge removal) of the biological treatment to a large extent evaluate restricted and avoided.

especially in the treatment of wastewater from the chemical industry, Textile industry, paper production, scarfing etc. the new process has become in Try proven.

The basis of the present invention is that established in experiments The fact that certain substances catalytically break down organ substances in water enable. This reduces the BOD content in the water.

It is known and state of the art that by substoichiometric Amounts of strong oxidation chemical chewing in the post-treatment stage after activated charcoal Treatment of the water also degrades hydrazine and / or dimethylhydrazine (Publication "Water-Air Operation 11 July 1969).

The use of activated charcoal is also known in the chemical industry in the catalysis of e.g. vinyl chloride and vinyl acetate monomers as well as in the Manufacture of sulfuryl chloride.

Experiments have shown that the catalytic treatment of wastewater with granulated charcoal, preferably granulated activated charcoal on organically highly polluted Water can be used with little or no sludge accumulation with supply of air if peat coke and / or pumice is added as an additional catalyst.

For this purpose, the water to be treated is fed into vessels, which contain the catalyst necessary for the conversion in solid form.

The air necessary for the conversion and reaction of the substances to be broken down is introduced and distributed by means of a surface aerator or flotation stirrer. The surface aerator (flotation stirrer) is equipped in such a way that in addition to the air intake has given a slight dissolution of water, air and catalyst is.

The amount of catalyst is constantly moving in the water and the speed of the Schlenges the flow is measured in such a way that it prevents the catalyst from settling around the pool floor will.

The hoof retention time required to treat the water is C, 5 - 5 hours, depending on the desired breakdown performance and ingredients.

The amount of catalyst used depends on the type of the catalyst. With a normal activated carbon catalyst, the necessary Amount with delay between 2-15 percent by weight based on the hourly rate to be enforced Water amount. The peat coal or pear to be used in certain cases is located preferably up to 25 percent by weight.

In the case of a modified type of catalyst, a carrier substance is used (Coal, pumice) in the well-known vacuum process metal salts evaporated. The for this Salts that are preferably used include iron, nickel,% mercury, manganese halides and / or Sufate.

The metal salts are added to the carrier substance in an amount of 0.1 - 5 percent evaporated.

These catalysts treated in this way are suitable for organically polluted Sewage with certain ingredients in a very special way.

The catalyst to be used in a waste water is in each case by Attempts determined. For example, it was found that surface-active substances (Alkylarylsulfonate) degraded faster with the metal-coated activated carbon catalysts were considered with an untreated charcoal.

In experiments with wastewater from the paper industry in a biological Wastewater treatment plant was processed, could be determined in parallel with the new process be that with a residence time in the catalyst tank of 3 hours. A BOD5-AbEau of an average of 95% was achieved. In contrast, in the biological stage with Clarification with a total stay of 5 days, the same degradation is achieved. While no complete discoloration of the wastewater could be determined here, however, was the water, treated according to the novel process according to the invention, is essential Completely discolored in a shorter time0 are followed by patent claims

Claims (1)

P a t e n t a n s p r ü c h e 1. Process for cleaning organic heavily polluted process and wastewater thereby marked, gass the to be treated Water a catalyst in the form of granular coals, preferably activated carbons as well Coke and / or pumice are added and mixed with air using suitable devices is, 2. The method according to claim 1, characterized in that the coal uni / or Pumice in a well-known egg is first treated with metal salts and then as Catalyst is used in organically polluted water. ,. Process according to Claims 1 and 2, characterized in that the amount of catalyst used is between 2 and 50 percent by weight on the hourly amount of water to be enforced, 4. Device for implementation of the method according to claims j, 2 and 3, characterized in that the circulation, Introduction of air into the water and the mixing of the three phases by means of surface aerators and / or flotation stirrer takes place.