DE3934122A1 - METHOD FOR AEROBIC ROTATING OF HIGH-LOADED WASTE WATER - Google Patents

Abstract

In known decomposition reactors, batches of unit loads which decompose only slowly, if at all, are stored. Highly charged waste water whose solids adhere to the large internal surfaces of the batches of unit loads and decompose aerobically in the insulated decomposition chamber with high self-heating are sprayed onto the batches of unit loads. The liquid which seeps through is collected and repeatedly sprayed onto the batches. The dissolved nutrients in the seepage liquid take part in the process as they seep slowly through the batches of unit loads and the seepage liquid is gradually purified. The process of the invention can be carried out so that decomposing materials are enriched with high amounts of decomposed solids from the waste water and similar quantities of biomass, or so that decomposing materials which are hard to wet are thoroughly moistened and excess moisturizing water is purified.

Description

Liquid manure or manure consists of the entire liquid and solid excrement of pets.

Cattle manure has an average of all forms of cattle farming around 8-12%, Pig manure approx. 3-8% dry matter TS.

This TS is partly solved in the liquid phase of the slurry. The dissolved substances become improper or out of date Spreading the manure into the groundwater as plant fertilizer washed up. For this reason and also because of the strong smell Annoyance is therefore increasingly becoming a full disposal excess manure.

In terms of this full disposal task, manure is extremely high contaminated wastewater.

Because of their high levels of plant nutrients, manure is also a high quality fertilizer. The efforts towards full disposal The goal is therefore to achieve this goal, especially nitrogen supply to fully maintain manure bonds on the one hand, on the other hand but in water-insoluble compounds so that they only when the soil is warmed up and the plants begin growth through the microflora of the soil gradually in again plant-available compounds are converted.

This is achieved to a high degree through aerobic hot rotting under op timed process conditions.

The German federal patent DE-PS 32 04 471 and the Offenle The publication DE-OS 36 11 046 describes such an aerobic Full disposal of manure.  

By adding finely chopped straw, the flowable Manure to stackable material that is in special roto-reactor heat up with frequent loosening, mixing and aerating rots.

After 6-8 days of hot rotting, an N-bin becomes in these plants reached over 90%.

The mixing, loosening and conveying devices of these systems are able to mix the rotting material as often and to loosen and aerate at the same time as well as to certain To promote times through the reactor.

These processes only process manure with aggregates preferably shredded straw, which is an inseparable part of the Process product is and therefore constantly as an adjuvant Manure must be added.

Such procedures are uneconomical because of the aggregates for the desired, economic exploitation of the Ver driving product are too expensive.

Try to separate the coarser solids from the manure and the se without additives in the systems described aerobically rot, are in relation to the rapid material turnover in the op timed rotting process was positive. But with that no full disposal achieved because the liquid phase of the manure the undetected fine solids and all dissolved content is not disposed of. If you remove this fine hard substances through a fine filtration and the dissolved substances Reverse osmosis from the pre-cleaned liquid phase of the manure, see above the overall process becomes too expensive.

In municipal wastewater technology, wastewater is in the trickling filter cleaned by process. The trickling filters are conical or cylindrical deriform and consist of a bed of irregular ge  shaped fragments, mostly lava slag, through an outside coat are held together. The trickling filters are from above sprayed with wastewater to be cleaned. With slow drifting The core of the wastewater is initially on the large retained inside surface of the trickling filter parts. You bil the relatively thin layers there, which are dripping from the Liquid should be kept moist. Because these organic Surface layers are constantly surrounded by air, they will quickly colonized and broken down by an aerobic microflora. The dripping liquid is on its way through the several Meters of trickling filter included in the aerobic degradation process, so that their dissolved components in the solid layers pass over.

The trickling filter process takes place at outside temperatures. The aerobically degraded substances are continually by wastewater seeping off the trickling filter over time and form the sewage sludge in collection basins. This must be done daily withdrawn from the reservoir, then drained and in Digestion towers are treated further.

This drip is for the extremely highly polluted sewage slurry body method not suitable because of the high solids content on the inner surface of the trickling filter thick layers bil that would be the long time to complete aerobic degradation compel. In addition, the liquid phase of the manure contains such large amounts dissolved substances, that an often repeated leakage of the same Charge through the trickling filter would also be required to remove the To clean slurry. It could not be avoided that the thicker layers of solid are partially entrained and  form densifications in the lower part of the trickling filter, which Prevent aerobic process in the trickling filter.

The invention is therefore based on the object of a method propose that in Rotterdam reactors with technical input directions to loosening that can be repeated as often as required mixing and ventilation of the rotting material are equipped with a fold means can be carried out and inexpensive Full disposal of highly contaminated wastewater such as B. liquid manure, with aggregates in particular very largely or completely be saved.

This object is achieved in that known Rotterdam reactors with mixing, loosening and conveying equipment lines are provided, with rela tiv lightweight general cargo particles, which themselves do not rot or only rot very slowly and the waste to be disposed of water is distributed evenly over this stack of items, so that the solids of the wastewater leak through the general cargo stack on the surfaces of the general cargo particles in Deposit layers that are surrounded by air while the Liquid phase of the wastewater through the packaged goods in Collection container seeps and from there repeatedly over the pieces well stack is pumped back, being in the case of a partial Compression, especially in the lower area of the general cargo pels, the same loosened as needed and perpendicular to the reactor mixed soil and after the intended rotting time to Venue of the Rotterdam reactor is promoted, where by separation devices the rotted dry matter of wastewater from the general cargo particles and the cleaned general cargo particles again  be placed in the reactor at the filling location and so the process is repeated.

Further details of the invention are given by the patent sayings marked.

The particular advantages of the invention are the savings cost of mechanical separators with which the Solids of the manure so far before the reactor passage from the Liquid phase are separated and in the extensive savings addition of aggregates with the resulting increase in Processing capacity. In addition, the liquid phase becomes very largely freed from dissolved substances.

The invention is illustrated below in several examples poses.

Wood comes in many forms as waste wood: bark waste, Branch wood from the pruning, crate waste from industry and trade etc. Since it is mostly forbidden to burn wood waste, ver one often looks to shred them and then to com post. Shredded wood or bark rots very slowly.

Waste wood becomes one with existing machines on the market Cut piece goods with an average piece size of 40-80 mm reduced and up to the prescribed height in rotting shafts of the reactors filled. A mixture of elongated and round or more cuboid pieces are particularly loose Stack and is therefore preferable.  

Liquid manure is sprayed over this stack of pieces of wood. To one Compression of the upper stack area when spraying the To prevent fresh manure, especially at high hard the slurry, the mixing and loosening devices be started.

The amount of slurry to be applied per stack volume depends on the festival substance content of the slurry. It must not condense the Stacks come, which ver leakage of the liquid manure phase prevents or very difficult.

The liquid phase of the manure is put up in a collecting container to catch. It contains larger ones after the first leak Amounts of fine solids.

The stacked cargo is loaded until the thermophilic rotting temperature (45 degrees Celsius) mixed process and aerated.

As soon as this most active rotting condition is reached, the collected liquid manure carefully in small amounts per Unit of time pumped over the stack surface. No one is allowed to Flow movement in the stack come with the larger amounts of solids tears.

It is advantageous to pour the liquid manure out of perforated pipes Pile drips in case they need for a fine spray contains too many solids through nozzles.

A gradual washing away of the solids in the lower Be rich of the red pile is mostly unavoidable. The one from it  resulting compression is caused by frequent mixing of fixed lower in the upper stack area. At the same time to provide the usual ventilation.

The red pile is in the usual way through the Rottereak promoted. Usually this happens so that the rotting stack moved around a filling batch from the filling location to the removal location and replace the eliminated batch with a new filling batch becomes.

For the method according to the invention then applies that the free space first again with solid piece goods, in the be example is filled with pieces of wood. The Manure may only be applied to the stack of wood when this has reached full height, because otherwise larger quantities Liquid manure solids are washed away into the collection container.

The collection container for the leaked liquid manure is in individual containers for each filling batch section of the Rottereak tors divided so that the liquid and that in the stack too retained solids of a batch always in the same pro stay section. This is achieved in that the manure liquid synchronized with the batch conveyance in the next collection container is pumped.

This process also makes the liquid manure liquid aerobic cleaned because their fine solids and those dissolved in it Substances slowly leaking through the rotten Solid layers on the surfaces of the pieces of wood of the piece gut stacks are included in the aerobic process.  

The finished rotting material consists of the desired aerobic implemented dry matter of the manure, which is still largely on adheres to the surface of the pieces of wood. Both become from the reak discharged and advantageously ge on a vibrating screen brings. The rotting material is quickly and quickly shaken in a thin layer in sieved, rotted damp manure dry substance and the cleaned pieces of wood separated.

Screen drums and centrifugal force can also be used as the separating device systems and similar systems are used.

The pieces of wood go back to the process. Because wood in such an aerobic process is slowly degraded the pieces of wood are renewed from time to time. Compact wood pieces such as B. knotty wood or boxwood pieces are, however only after about 20-25 passes through the Rotterdam reactor rotten that they disintegrate on the vibrating screen. Therefore it will only requires small amounts of this cheap material. Rough Bark material decomposes because of its more open fiber structure tur faster, but is cheaper to buy than rei piece of wood and therefore well suited.

The method according to the invention is also light ceramic or mineral general cargo such as B. Broken brick, waste from the ceramic industry, sintered rust slag, lime tuff, lava slag, coke, etc.

In a variant of the method according to the invention, the Slurry is only applied to a part of the batch when filling a batch fresh stack of general cargo applied. The in the collection container seeped liquid manure is then only on the part of the stack that was not loaded with fresh manure de and therefore not relative to the mass of the coarse solids is compressed.  

This procedure ensures that the mass of the coarse Solids in the slurry gradually lose more and more liquid there and therefore less easily compressed. The drier it is Rottengut is, the easier it is to maintain the aerobic state and the denser rotting material can be stored without becoming anaerobic.

The liquid manure is particularly quick in this process aerobically cleaned as they leak through the others Cavities of the not so densely compacted with liquid manure solids General cargo stack particularly intimately with the heated process air in Touch comes.

This variant of the process can also be done in two separate reacts gates are carried out. This has the advantage that the mass the solids of a filling batch and their associated liquid not necessarily at the same throughput rate Run through the reactor. Both Rotterdam reactors are controlled that the target intensity of the aerobic turnover is achieved.

Claims (5)

1. A method for the rational operation of known Rotterdam reactors, which are equipped with mixing, loosening ventilation and conveying devices which can mix, loosen and ventilate the material to be rotated as often as required in the vertical direction to the reactor floor, characterized in that known Rotterdam reactors which operate with mixing - Loosening and Förderein directions are provided, are filled in the respective intended height with relatively light general cargo particles, which themselves do not rot or only very slowly and the wastewater to be treated is evenly distributed across these batches of bulk goods, so that the solids of the waste water when seeping through the piece goods stack, deposit on the surfaces of the piece goods particles in layers that are surrounded by air, while the liquid phase of the wastewater seeps through the piece goods stack into collecting tanks and is repeatedly pumped back from there through the piece goods stack, in which case one r partial compaction, especially in the lower area of the general cargo stack, which is loosened as required and mixed perpendicular to the reactor floor, and is conveyed to the discharge location of the decomposing reactor after the intended rotting time, where the rotted dry matter of the wastewater is separated from the general cargo particles and the cleaned ones by separating devices General cargo particles are placed in the reactor again at the filling location and the process is repeated. 2. The method according to claim I, characterized in that the General cargo consists of pieces of wood or bark. 3. The method according to claim I, characterized in that the General cargo as a light porous mineral material, such as e.g. B. lava slag, limestone tuff, pumice or light Sintered materials such as B. Broken brick, ceramic Ab felling or similar material, such as lignite or hard coal slag ken or coke.   4. The method according to claim 1, characterized in that the Rotterdam reactor with a collection container for each batch Pump and spray back system for the seeping liquid is equipped and the liquid in the the next container to be pumped. 5. The method according to claim 1, characterized in that the Separating device for separating the from the Rotterdam reactor excreted stacks of rot in rotted solids and reusable piece goods from a vibrating screen with sharp angular sieve plate or other known separation processes consists.