DE277C - Process for treating waste water from wool laundries and fulling mills - Google Patents

Description

1877.

Grade 12.

ED. NEUMANN in ROSSWEIN. Process for the treatment of waste water from wool laundries and fulling mills.

Patented in the German Empire on July 15, 1877.

The treatment of the waste water from the wool laundries and fulling mills has been carried out until now in two ways.

After the lime process, the water is in large masonry basins with milk of lime mixed; lime soap forms, which after a few days separates out as a muddy precipitate; the clear water above it is drained, respectively. filtered through the hollow bottom of the basin; the separated mud is dried, cut out and further processed on fat. (Spongy grain method in Aachen.)

This procedure offers the advantage that all waters, even those with little fat, are used can be, nevertheless the associated evils are so predominant, that it finds little application. To build the basins that contain thousands of cents of water must take up (for uninterrupted operation, of course, two are necessary), belongs First, a lot of space and especially a comparatively large investment capital; also requires the drying and cutting out of the mud is a great deal of wages, so that the return. stand is significantly increased in price. - It follows from this that small or with Factories with limited space have to refrain from the lime process.

According to the other most common method up to now, the fat is made by sulfuric acid excreted, after some rest it becomes the one floating on the water with dirt and woolly hair contaminated fat layer skimmed off. Then the mechanically carried one becomes cold first Water, then squeezed the fat warm.

This method also suffers from some shortcomings. . It also requires because of the a lot of space and investment capital for many of the devices required for this, even if not so important, like the lime process and is only worthwhile for the largest factories.

The waste waters are brought together in large, tapped barrels with Sulfuric acid is added until the reaction is weakly acidic, and the mixture is boiled with direct steam; after Four to six hours of cooking they will leave some time to rest until the fat has settled completely on top, the same is skimmed off and the clear water through removed the taps. If a larger mass of unclean fat has been obtained in this way, so the same is cooked again and then squeezed.

It is easy to see that the coming together of great masses of water and that Cooking them is very expensive, and for this reason only the richest in fat are used Can use water. A further shortcoming, however, is that the process is only then profitable is when the wool or cloth has been washed with urine, but not, as often happens, with so-called brine (i.e. waste the soap factories). In the latter case, the exhaust locks and will be kept clean Rivers not achieved. There is also a very serious drawback of the acid process the unavoidable bad smell, which is why the fat factories are always in remote locations to get expelled.

The task of the new procedure is to find ways and means that can be used in achieve the goal in each case, be washed with urine or other detergents, and according to which one can work up even the lowest fat water, at the same time a complete one Keeping rivers etc. clean is achieved. The establishment must also be so compendious and cheap that it can be found anywhere and that the processing of the waste water also in still makes a profit in the smallest and most remote factories.

This goal is achieved by the following procedure.

The whole facility in every laundry or fulling consists of:

2 reservoirs buried in the ground (2 oil barrels of 12 to 15 centner capacity), in which from the fulling machines respectively. Washing cylinders through Locks or pipes that run in the wash water;

ι suction and pressure pump;

ι Filter press with waste chute.

The procedure is as follows:

Crude calcium chloride (or its substitutes, which form soaps which are insoluble with fats in water) are dissolved in equal parts by weight of water, and from this solution, depending on the degree of fat content of the water, one- _{half to two} pcts is poured.

of the capacity in Reservoir No. i. The washing water is then run in. The movement that occurs when the water flows in causes it to mix intimately with the calcium chloride solution; the immediately formed lime soap separates in fine flakes that remain suspended in the water. If the reservoir is filled, the contents are pumped into the filter press and meanwhile drains the washing water into reservoir no. 2 run, which one has also been previously charged with the necessary amount of calcium chloride.

Lime soap, dirt, hair etc. remain in the filter press and the water, essential. borrowed potassium and soda solutions and some excess calcium chloride in very dilute form Containing states, runs clear through the gutter. After reservoir 1 has been pumped out is, reservoir 2 is pumped out and 1 refilled and so on until after about 8 to 12 hours Pumping the press is full, which is easily recognized by the fact that the taps are open only dripping weakly. The press is opened and the Prefskuchen, as far as they are not fall out by itself with a wooden spatula, the press closed and the pump re-indented, whereupon the work begins again. Just pouring in the calcium chloride the opening resp. Closing the faucets, removing the cakes and moving in the pump requires the hand of a worker, but is done in a few minutes, so that a special worker is not necessary for this.

The prefce cakes obtained are either air-dried and used for the manufacture of Fat gas or more profitably used for the extraction of fat. The fat production forms a special part of the treatment of the waste water, and can be obtained from larger milling and wool washes can be done by yourself.

The cakes are mixed with very dilute hydrochloric acid to a thin paste; if if necessary, hydrochloric acid is added until the reaction is weakly acidic. Then the Mass pressed through a filter press heated with steam. Fat and the Formed Again Calcium chloride buy into small vats, from which the calcium chloride solution after a while with the excess hydrochloric acid is drawn off into a vat, which something contains carbonate of lime, with which the hydrochloric acid again forms calcium chloride, which in turn is used to prepare new quantities of lime soap. Thus the procurement of Calcium chloride needed only once.

The fat is 10 pCt. ten degree sulfuric acid by direct fire in one Kettle heated up to 70 °, whereupon after a period of rest it clearly floats up and in Barrels being scooped up and ready for sale.

Claims (3)

Patent claims: 1. The factory treatment of fatty waste water from wool laundries and fulling mills with calcium chloride or its substitute, for the elimination of fats or other impurities from the Waste water, may now be washed with urine or brine in the factories mentioned will. 2. The separation of the flaky compound of lime with the Fat from the waste water to lime soap, from the water by means of well-known filter presses. 3. The treatment of the filter cakes, for excretion of the fat and for recovery of calcium chloride, in order to allow the latter to further manipulate with waste water to be able to use it again, as everything has been described above.