HU210231B - Method for intensifying degradation of sewage water sludges with hard decomposable organic material content and the application of these sludges for recultivation purposes - Google Patents

Abstract

The method according to the invention is characterized by anaerobic treatment for a minimum of 6 months after aerobic treatment, followed by mixing the treated mixture with a 1-3.0.5-1.5 volume stabilized flush to effect intensive aerobic treatment. mixing the thus treated mixture with a further 5-10% by weight of stabilized fly ash on the surface of the plant storage tank, preferably 0.5 to 10 m, and aerobically on the upper, preferably 20 to 50 cm, portion of the resulting layer, while the lower part is anaerobic After the first layer is maintained for at least 6 months, the upper layer is seeded, and after 1 to 3 months, the upper layer is depleted and recycled for re-cultivation, and cycling is repeated in a desired number. EN 210 231 Scope of the description: 4 pages

Description

The process according to the invention is characterized in that the mixture is treated anaerobically for a minimum of 6 months after the aerobic treatment and then mixed with a fly ash stabilized in a volume ratio of 1-3: 0.5-1.5, thereby providing intensive aerobic treatment. and then spreading the mixture so treated with an additional 5-10% by volume of stabilized fly ash on the surface of the power plant storage tank, preferably 0.510 m thick, then aerobically on the upper part, preferably 20-50 cm, and anaerobic on the lower part. the phase is maintained for at least 6 months, then the top layer is planted with gorillas, and after 1-3 months, the top layer is harvested and drained for recultivation, and the gangrene planting and top layer production is repeated cyclically as desired.

Scope of the description: 4 pages

HU 210 231

HU 210 231 A

The present invention relates to a process for intensifying the degradation of poorly decomposable solids in dry matter, preferably for the disposal of pharmaceutical wastewater sludges and for utilization of the material for recultivation purposes.

It is known in the art that organic matter can be degraded by aerobic and anaerobic processes. A characteristic feature of these biological systems is that the decomposition process consists of cyclically accelerating and then decelerating phases, a phenomenon that results from chemical and biochemical processes. These processes are characterized by being self-regulating.

The investigation of the degradation of organic matter-containing sewage sludge showed that in the aerobic and anaerobic degradation processes on fly ash carrier, similar phenomena can be observed in the aerobic phase as well. It is apparent that the materials formed in the former process provide an opportunity to restart degradation in the other process.

Based on these findings, it is a prior art practice to alternate aerosol and anaerobic phases to treat the wastes with high organic matter content.

In support of the above, we refer to some relevant literature.

HU 186 332 patent proposes first an aerobic fermentation followed by an anaerobic digestion. As a result, an energy-producing gas product and a solid phase material are formed, which is recommended for soil improvement. The solution describes expensive equipment and technology, i.e. thermal digestion in closed containers, which significantly limits its application, especially for the task of treating large-scale industrial sewage sludge.

No. T / 39941. U.S. Patent Publication No. 4,123,125 describes a procedure for the biological re-cultivation of fly ash. The essence of this is that the surface of the marshmallow is covered with a weak layer of soil that absorbs dust, into which the crop is planted. Sewage sludge is delivered to the already harvested area and part of the organic matter from aerobic organic matter decomposition can be absorbed or utilized by the crop. The disadvantage of the process is that it requires a very long technological time, i.e. the establishment of crop plants in several phases.

György Szakács: "Treatment of hardly degradable compounds with microorganisms". Nitrochemistry RT publication 1992. The author proposes a closed reactor (fermenter) for the decomposition of organic matter, which is suitable for both aerobic and anaerobic processes. He sees the limitations of using fermenters at high operating costs. According to the author, the suggestion is not applicable where the temperature is low.

Worthy, W: Anaerobic digestion of industry waste sought. Chamical and Engeneering News. 69 43. S. October 1991. The publication deals with the treatment of anaerobic organic matter, which results in the use of the material for plant cultures and the ability of the vegetation to extract some of the organic matter.

The resulting biogas can be utilized for industrial purposes. It has the disadvantage of having an unpleasant odor which limits its applicability.

In connection with the latter publications, it is emphasized that the treatment of 10,000 m ^{2 of} sewage sludge, the creation of aerobic and anaerobic phases of organic matter, taking into account the loading, transport and spreading needs of these volumes, cannot be a solution.

A process suitable for similar purposes is described in DE 3 315 274. A description is also made in which the substances in the sewage sludge are solved by planting hemp, nettle or sunflower by applying a plant filter layer, such as moss and straw, under the sewage sludge layer. The disadvantage of the process is that the overgrown plants cannot be utilized for recultivation purposes.

The aim of the present invention was to achieve the degradation of difficult-to-decompose organic materials in a significantly faster time and at a lower cost.

The present invention has been further elucidated by the discovery that the above objectives can be achieved by cyclic repetition of aerobic and anaerobic processes and by the application of fly ash.

SUMMARY OF THE INVENTION The present invention relates to a process for intensifying the degradation of wastewater sludge containing poorly decomposable organic matter and utilizing it for re-cultivation using aerobic and anaerobic treatments, characterized in that the mixture is treated anaerobically for a minimum of 6 months, the treated mixture is mixed with a fly ash stabilized at a ratio of 1-3: 0.5-1.5 vol. for intensive aerobic treatment;

While mixing with 5 to 10% by volume of stabilized fly ash, it is spread on the ash storage surface of the power plant, preferably 0.5 to 10 m thick, and an aerobic and an anaerobic phase is maintained on the upper, preferably 20 to 50 cm, layer. for at least 6 months, then grafting to the upper layer, then, after 1-3 months, producing the upper layer and draining it for recultivation, then repeating the grafting and upper layer production in the desired number of cycles.

As used herein, tf% is by volume.

The process according to the invention will be described in more detail by way of example.

Example

000 m ³ sludge containing pharmaceutical industry gypsum slurry chemical treatment and biological treatment of the excess slurry disposal task.

Sewage sludge is classified as Category II hazardous waste. An aerobic decomposition phase is under way in the sludge ignition basin. The pool is covered with straw bales of 40 x 60 x 80 cm, covered with marshy soil mixed with grass seeds. The anaerobic degradation process in the material is 6 months2

EN 210 231 Reserve for the day. An 8,000 m ² waterproofed (stabilized fly ash) composting plant, surrounded by belt ditches, is then constructed. Simultaneously, 10,000 m ^{3 of} power plant fly ash is mixed with the material in the basin, and this mixture is spread at the composting plant to a thickness of 6 m, while another 3,000 m ^{3 of} fly ash is mixed into the material. The sides of the composting plant are stabilized with fly ash. This operation involves an aerobic and anaerobic decomposition of the delivered material. The duration of treatment is 6 months. The entire material is then transported to the power plant fly ash surface and spread over an area of 4-6 hectares. The layer thickness is 1.5 m. Thereafter, aerobic decomposition processes occur in the upper 2030 cm thick layer of the fly ash layer, and anaerobic degradation processes (approximately 70%) underneath.

Then vegetation (grasses and shrubs) is planted in the upper layer. Thus min. Within 3 months we will establish a rich vegetation. The vegetation sucks up the remaining organic matter in the upper layer and utilizes it for growth. The above upper layer is harvested as hazardous and recycled. The lower layer that emerges in this way is partly aerobically decomposed, and the organic matter sucked out by vegetation is harmless to this layer within 3 months. We create the same process down to the bottom layer, respectively.

The process according to the invention provides the following key advantages over prior art solutions:

- Disposal of hazardous organic sludge with high organic matter content can be achieved within 2 years instead of the previous 6 years.

- The procedure we recommend requires less space with 1/5 of the area.

- The recultivation date can be brought forward significantly.

Substantial recultivation material is available after 1 year.

- The hazardous waste period can be reduced by at least 4 years.

- Our process requires significantly less cost of loading, shipping, distribution, etc. on the square.

- Perhaps the most important benefit is Pharma II and III. Category 3 hazardous waste sludge is hazardous for the disposal of the material of the 10 000 m ³ collection basins and its utilization for recultivation purposes.

Claims (1)

PATIENT PERSONALITY A method for intensifying the degradation of wastewater sludge containing highly degradable organic material and for utilizing sewage sludge for recultivation, using aerobic and anaerobic treatments, characterized in that, after aerobic treatment for a minimum of 6 months, the mixture is treated anaerobically and then treated 1 to 3. Blended with a 0.51.5 volume stabilized flake, intense aerobic treatment, and then dispersing the thus treated mixture with a further 5-10% w / v stabilized flange on a power plant flyover surface, preferably 0.5-10 m thick and the upper layer of the resulting layer, preferably 20-50 cm, is aerobic, while the lower layer has an anaerobic phase for at least 6 months, and the upper layer is planted with kelp, and after 1 to 3 months the top layer is deposited and recultivated. then the planting of the tufts and the laying of the upper layer are repeated cyclically.