DD140447A1 - METHOD FOR THE TREATMENT OF ORGANIC MATERIAL IN WAESS-ROLLED FLUIDS - Google Patents

Abstract

The invention relates to a method for the treatment of organic material in aqueous liquids whose aim is to by substantially increasing the continuity of the qualitative and quantitative development of the microorganisms the process time shorten known aerobic-thermophilic degradation process, the Increase process safety, thus reducing capital and operating costs lower and beyond by using large-volume Generate bacteria feedstuff with economic means. Besides is the cost of the solid-liquid phase separation after the reduced aerobic-thermophilic degradation process and that in the liquid Phase existing process heat continues to be used. Besides, one is Use of the treated material without additional sanitation measures usable for soil improvement. According to the invention Task solved by the targeted use of bacterial strains Bacillus megatherium and Bacillus calidolaktis as starter cultures in the aerobic-thermophilic degradation process according to the invention prescribed procedural steps takes place. The invention is in the plants of industry, agriculture, water management and Municipal economy applicable in which organic material in aqueous fluids are obtained, e.g. in the manure and Sewage sludge treatment

Description

ΐ. Title of the invention

Process for the treatment of organic material in aqueous liquids.

2. Field of the invention

The invention is in the plants of industry, agriculture, .Wasserwirtschaft and communal services, in which organic material is obtained in aqueous .Flüssigkeiten such. B. in industrial animal production plants or sewage treatment plants, applicable.

3. Characteristic of known technical solutions-

It is known that organic material is stabilized in aqueous liquids by means of aerobic-thermophilic degradation processes.

In this case, the desired stabilization and sanitization of the organic material in the presence of the known conditions by utilizing the present in natural and thus random composition in the respective organic starting material bacteria after 6.0 to 10.0 days (see Patent No. 92881) and 2, 5 to 7.0 days (see LOLL: "stabilization of highly concentrated organic .waste water and sewage sludge by aerobic-thermophilic degradation processes." The gas and water compartment / ~ water, sewage year 115, Issue 4, 1974) reached.

For the necessary circulation and fumigation known devices are used. It is furthermore known that the liquid phase from the manure of industrial animal production plants is inoculated with budding yeast and is microbiologically prepared in a continuous process by introducing air into the liquid which is moving in a container.

is injected (see Patent No. 99768). The known methods have the following disadvantages:

- The use of existing in natural, random composition in the respective organic material in aqueous fluids aerobic microorganisms (bacteria) in the application of aerobic-thermophilic degradation processes has long process times (technological treatment times) and thus high. 3foves subscription and operating costs result. This is caused by the aerobic microorganisms, which vary in their effect and composition, which are dependent on time, organic material and on upstream production stages. This in turn results in fluctuating adaptation times.

- Process times of at least 60 hours are required.

- The solid-liquid phase separation is technologically difficult and associated with high economic costs.

- Gate of application of the method of inoculation of the liquid phase of liquid manure with budding yeast, a complex solid-liquid phase separation is required. i.

- When using the method of inoculation with yeast is at high-concentrated organic material a H _? S- and SOp-EL imination necessary because all known yeasts are sensitive to sulfur. The chemical disposal is economically and technically very complicated. Bacterial purification is possible. In this case, however, essential, required for the yeast growth nutrient amounts lost by the competitive growth of the bacteria, so _that: the yield then obtained 'in yeast is too low. In order to eliminate this disadvantage, the organic material is enriched with low-molecular Köhlstoffver- compounds (mainly hexoses and pentoses). This additional process level also requires high economic and technological expenses.

The hygienic nature of the treated organic material is suspect and the feed quality due to the high Ba'llaststof fan part low.

4. Object of the invention

The aim of the invention is to stabilize and sanitize organic material in aqueous liquids with low economic costs and to shorten the process time of the aerobic-thermophilic degradation process, increase the security of the process and thus reduce the investment and operating costs.

In addition, bacterial protein should be obtained, mainly from the growth of bacteria of the group Bacillus III.

It is a further object of the invention to improve the hitherto unsatisfactory and very? End end solid-liquid phase separation.

5 "Explanation of the Bfese'ns of the invention

The invention has for its object to develop a method by which organic material is treated in aqueous liquids by the addition of defined bacterial strains and possibly by adding chemicals so that the organic material largely eliminated and .Bakterieneiweiß is obtained.

According to the invention, the object is achieved in that the treated organic material to be treated liquid is passed into a mesophilic reaction vessel into which a targeted input of bacterial strains Bacillus megatherium and Bacillus calidolaktis is carried out as a starter culture in this reaction vessel is carried by circulation and gassing of the liquid known devices the treatment up to the mesophilic optimum. Thereafter, a precisely defined portion of the pretreated liquid is passed through known delivery units in a thermophilic reaction vessel. Here, the treatment is carried out up to the thermophilic range by renewed circulation and gassing of the liquid. At the same time a maximum of bacteria protein is obtained here and precipitated by the addition of calcium hydroxide. This is followed by solid-liquid phase separation.

A defined subset remains in the thermophilic reaction vessel. The remaining defined portion in the mesophilic and thermophilic reaction vessel is used as a starter culture for the next successive amount of organic material to be treated in aqueous liquid.

embodiment

Below, the invention will be explained in more detail by way of example.

The organic material in aqueous liquids, e.g. Mud of a municipal sewage treatment plant is fed to a reaction vessel and there by means of known devices, eg. B. pressure jet apparatus, circulated and fumigated. As an initial starter culture, for the purpose of controlling the process and the rapid incorporation of the bacterial system at the beginning of the continuous process, a one-time addition of pre-grown bacteria, Bac. calidolactis and Bac. megatherium added in a defined amount. The optimum metabolite turnover of the mesophilic flora is reached after approx. 24 hours. At this time, a certain amount of the contents of the reaction vessel is conveyed to another reaction vessel. The reaction vessel is then filled again with untreated sludge. The contents of both reaction vessels are now circulated 24 hours and then gassed, so that in the thermophilic reaction vessel a monoculture of the inoculated thermophilic flora and thus the desired stabilization and sanitation occur 48 hours after the start of the treatment, while in the mesophilic reaction vessel the optimum After the process temperature has been reached in the thermophilic reaction vessel, a defined amount of calcium hydroxide is added and after a certain period of action, the treated sludge is passed through a centrifuge for solid-liquid phase separation Amount of semi-treated sludge (mesophilic flora) pumped and after

the mesophilic reaction vessel again filled with untreated sludge. The replenished defined subsets correspond to the withdrawn subsets. The total reaction time is up to 48 hours. After 24 hours, the draining and filling of the two containers is carried out by inoculating the freshly supplied sludge with 5 "vol.% Of their respective bacterial status for the purpose of rapid incorporation of the system and the maintenance of the temporal and qualitative continuity of the method." The resulting treated and centrifuged sludge (pest phase) has a protein content of about 25%> a crude fiber content of about 10 % and a crude fat content of about 20%. It can either be used in this state or after further processing as feed (mixing, drying) for Mono ™ gastrides (preferably pigs). The running about 50 ⁰ C warm Fugate is used to preheat the untreated sludge from the sewage treatment plant and / or for space heating.

Claims (2)

· »6 209 30! Invented at a later date · ' 1. A process for the treatment of organic material in aqueous liquids using the known aerobic-thermophilic degradation processes, characterized in that by targeted introduction of the bacterial strains Bacillus megatherium and Bacillus calidolaktis as starter cultures in a filled with the organic material to be treated in aqueous liquid mesophilic reaction vessel and through. "Circulation and fumigation of the same by known devices to the mesophilic optimum and by subsequent discharge of a certain amount of pretreated organic material in aqueous liquid in a thermophilic reaction vessel by renewed circulation and fumigation to achieve the thermophilic range and possible addition of calcium hydroxide, the qualitative and quantitative üitwicklung the aerobic microorganisms and a maximum of bacterial protein and the subsequent plague Liquid ig phase separation is achieved, with defined subsets remain in the reaction vessels. 2. The method according to item 1, characterized in that the remaining defined subsets in mesophilic and in the thermophilic reaction vessel are the starter cultures for the next to be treated amounts of organic material in aqueous liquid.