DD147091A1 - PROCESS FOR MECHANICAL-MICROBIOLOGICAL TREATMENT OF PIG GRAPHIC - Google Patents

Abstract

The invention relates to a method for the mechanical-microbiological treatment of porcine gas, the aim of which is by combining known devices of the guelle and wastewater treatment by solid-liquid separation a schuettfaehigen guelle solid and in conjunction with a microbiological treatment by the activated sludge process a strong BOD & ind5 ! - and nitrogen-reduced, freed from solids and Faekalgeruch Guellefluessigkeit and a greatly reduced in the amount, aerobically stabilized, no longer rotten excess sludge to win. By suitable separation devices, a high degree of separation of solids and colloids is achieved. If certain load conditions are maintained in the activation stage, the BOD & ind5! up to 99% and the nitrogen content in connection with an upstream denitrification b. 75% reduced, faecal odorants microbially degraded and the excess sludge amount can be reduced by solid-liquid separation and mineralization of organic matter. By a nitrite / nitrate-dependent control of the Belueftungskreisel the electric energy demand is lowered. The invention is everywhere applicable where the demands of environmental protection and crop production for odor removal and solid and Nährstoffminderung in the Guelleverwertung must be met.

Description

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Title of the invention

Method for the mechanical-microbiological treatment of pig manure

-Ause of the invention

The invention relates to a process for the environmentally friendly treatment of pig manure, which contained therein polluting solid and dissolved organic ingredients by solid-liquid separation and microbiological degradation reduced and on their way of bacterial nitrification and denitrification their nitrogen content can be reduced, and storage and Recycling of the products of manure preparation without odor nuisance is possible ·

Characteristic of the known technical solutions

In the known method of mechanical-microbiological treatment of pig manure, the pests contained in the manure by mechanical separation units, such as. B, decanter, ram vibrating screens with different degree of separation removed, while the liquid separating component of a microbiological. Degradation is subjected to the known from wastewater treatment activated sludge process. The two-stage method with a high and low load stage as well as single-stage methods with extended ventilation times are used. By both. Process obtained in addition to the separated manure solid in conjunction with a secondary clarification, the purified, almost free of suspended solids and reduced in their nutrient content liquid manure, which, with sufficient reduction of the contained decayable organic substances, storable for several months without odor nuisance. In addition to this purified

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Manure liquid accumulates excess sludge. The amount of excess sludge depends essentially on the sludge load and the content of primary solids and colloids in the pig manure to be microbiologically treated. In the known two-stage processes, some of the solids and colloids contained in the manure are separated before the microbiological treatment. However, from the intensive stage, especially as a result of the high sludge load, up to one third of the raw waste amount as excess sludge, which consists mainly of fäulnisfähiger organic substance, still has a high IT content and for its environmentally friendly agricultural utilization additional treatment costs arise. '·

The methods known for liquid manure, which operate on the principle of aerobic long-term biological treatment, still provide a large amount of stabilized excess sludge, since the primary in the slurry contained solids and colloids are not or only to a small extent before the microbiological treatment deposited / v / earth. In addition, a targeted nitrification and denitrification of manure nitrogen is missing in order to be able to reduce the nitrogen load for the recovery areas, adapted to the local conditions.

Object of the invention

The aim of the invention is to bring by suitable combination of known devices of manure processing a method for use with a microbiological preparation upstream or downstream solid-liquid separation in which a pourable manure solid is obtained by a slurry treatment by the activated sludge one over several Months storable, solids-free liquid manure with reduced ΪΓ content and a significantly reduced in the amount excess sludge accumulates, which is stabilized and not, more goes into decay.

Explanation of the essence of the invention

The resulting from the stable complex crude slurry must be freed to avoid interference in the subsequent treatment sections of foreign and coarse materials. This effect is going through

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achieved simple column sieves, which are equipped with rjechanischen cleaning devices. After an intermediate storage to ;; The purpose of the quantity and concentration equalization is the plague-liquid separation with or without upstream thickening by means of the combination curved screen / screw press. The curved screens, which are provided with a vibration device, thereby separate the pesticides and colloids contained in the manure in one to such an extent that the excess sludge accumulation is reduced in the subsequent microbiological treatment and is essentially borne by the synthesis of the dissolved organic substance of the manure. For further dewatering of the pests and colloids separated from the bow sieves, screw, belt presses, bow or vibrating screens are used, which produce a pourable manure solid which can be used as organic fertilizer in crop production or as feed in cattle fattening ·

The resulting from the solid-liquid separation liquid manure is subjected to a microbiological treatment process, which takes place in addition to the degradation and stabilization of the putrefactive organic substance in conjunction with a Denitrifikationsstufe, which is upstream of the aeration tank, an embroidery, substance reduction takes place · The degradation and the stabilization of the putrefactive organic substance as well as the oxidation of ammonia to nitrite and FITRIFF (nitrification), which is necessary for a substantial nitrogen reduction, take place in aeration basins. The oxygen required for this purpose is entered by surface aeration gauges, whereby an OC load value of approx. 2 kg Op / kg BSBp is to be used as the basis. · The loading conditions in the. Aeration basin are to be chosen so that a BOD, - ~ sludge load of about 0.053 kg BOD ₁ - / kg ST _R χ d respectively, a driven BSB ₁ --Raumbelastung of about 0.4 kg BOD _c ^ / m χ d The operation of the surface aeration gyro is preferably carried out in the interval, depending on the content of Hitrit or "Fitrat" in the aeration basin, in order to promote nitrogen decomposition in the aeration basin itself and to reduce the demand for Slektroenergy to a minimum.

duzierene

For the separation of the activated sludge from 'the purified liquid manure is the process d ^? Ventilation basin a settling tank, preferably Dortmund well supplied. While a large part

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of the activated sludge deposited here, which has a high concentration of nitrite or nitrate, is recycled in the aeration tank for the purpose of nitrogen degradation in the denitrification stage and for establishing an optimum activated sludge concentration, the purified liquid manure, which is largely freed of activated sludge, is taken to a storage basin. where further biodegradation takes place on a natural biological basis · From there, the agricultural utilization takes place · The aerobically stabilized excess sludge arising from the settling tank is subjected to post-thickening or / and mechanical roof drainage in a storage tank in order to reduce the amount of excess sludge. The utilization of the thickened or dewatered excess sludge also takes place on agricultural land. The sludge water is fed to the treated liquid manure. The solid-liquid separation can also be connected downstream of the microbiological treatment, whereby it is possible to separate a part of the excess sludge with the primary solids.

embodiment

, The basic variant of the process according to the invention and the required devices are shown schematically in Pig. 1, whereby the solid-liquid separation precedes the microbiological treatment. The raw slurry 19 discontinuously discharged from the stable complex 1 is fed by a pump 2 to the grime separation plant 3 the coarse particles 20 reach the landfill via a trailer 9, the coarse-free raw slurry 21 flows into an intermediate storage container 4, which is provided with a homogenizing device 5 to avoid sedimentation phenomena and for the purpose of concentration equalization. By a pump 2, the unfree crude slurry 21 is metered continuously fed to the bow sieves 6 · By the vibrator 7, the screen fabric i ⁿ oscillations, with the result that on the one hand, the throughput is increased comparatively without a vibrator and on the other hand, a secondary filter on the Forms screen fabric and thereby the content of solids in the passage of the arch wires 23 is reduced to a minimum. The residue of the curved screens 22 passes through the screw press to 8, in which a ^{wide> l} e dewatering the separated solid

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substances. The squeezed pourable pesticides 24 are poured off on trailer 9 and used in plant production as an organic substance. The Preßflüssigkeit 25 runs in free gradient together with the Bogensiebdurchgang 23 in the Denitrifikationsbehälter 10. Here is also the feeding of the nitrite and nitrate-containing RücklaufSchlammes 27 in the ratio Bogensiebdurchgang and pressing liquid 26 of 1: 1. The denitrification container 10 is equipped with a homogenizing device 5. The reducing organic substances (Η-donors) present in the curved sieve passage and in the pressing liquid result in a degradation of the nitrite or nitrate (denitrification) in connection with the microorganisms contained in the return sludge. , where elemental nitrogen is released into the atmosphere. The substrate 28 from the denitrification stage 10 is fed via a pump 2 to the aeration basin 11, which is equipped with surface-aeration cleaning BeIn 12 type BK-B 2400. The surface aeration gyros mix the contents of the aeration tank and contribute the oxygen required for partial mineralization of the slurry and for nitrification. At an activated sludge concentration in the aeration basin of 10 kg ST _R / m, a BOD, sludge load of 0.05 kg BOD ₅ Ag ST _R · d is run, with a residence time of 15 days. Under these load conditions, a sequence of nitrogen oxidation is achieved coupled with stabilization of the activated sludge. In the aeration tank, a nitrate electrode 13 is present, which switches via a control device 14- two surface aeration gyroscope in the interval. If, for example, the nitrate nitrogen content in the aeration basin has fallen below 200 mg / l, the switched-off two aeration gyro will be put into operation until the nitrate nitrogen content has again reached a value of, for example, 500 mg / l. Now again two aeration gyros are taken out of service. This rhythm can be repeated several times a day. The drainage from the aeration basin 29, that is to say the mixture of purified liquid manure and stabilized activated sludge, flows in a free gradient into a sedimentation basin which is designed as a Dortmund well 15-. The surface of the Dortmund fountain is like that

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dimensioned so that a pesticide surface load of 90 kg is not exceeded, that is to say that almost no activated sludge passes over the overflow edge of the Dortmund well. "

The purified liquid manure 30, so the overflow of the Dortmund fountain, flows to a storage container 16, which may be designed as a Erdspeicherbecken to from there with a pump. 2

to be rained as needed on agricultural land 18. The activated sludge 31 deposited in the Dortmund well is predominantly supplied to the denitrification tank 10 as return sludge 27, while the resulting stabilized excess sludge 32 in a storage tank Ί6 is subjected to post-thickening by natural sedimentation to reduce excess sludge amount. The thickened excess sludge 33, so the sediment of Nacheindickung, can be rained separately or together on the slide 17 with the purified liquid manure, as needed in the plant production · The resulting sludge water 34 Nacheindickung is fed to the purified liquid manure, as it also largely free of activated sludge is ·

Claims (6)

-t- 216501 claim for invention 1 method for the treatment of pig manure, characterized in that the medium is freed of coarse material by means of column sieve with mechanical cleaning device, that the non-coarse medium for the purpose of concentration and quantity equalization in storage containers is stored with homogenizer, that solids and colloids by a Fest- Liquid separation, preferably by means of curved sieves with vibrator and downstream screw presses, belt press., Bow or vibrating sieves, before or after the biological treatment directly or in conjunction with a pre- and / or secondary clarification deposited v / earth that the solid component as an organic fertilizer used in the production of plants or as feed in the cattle fattening, that the liquid component is a Denitrifikationsbehälter with homogenization, preferably a round container, fed, that the drain from the Denitrifikationsbehälter in a ventilation tank , preferably an in-situ concrete rectangular basin, passes that the required oxygen for the microbiological degradation, the sludge stabilization and nitrification of surface aerators, Yorzugsweise leaf gyroscopes is covered, that the drain from the aeration tank in secondary clarifier, preferably Dortmund fountain, flows that the separated, aerobically stabilized activated sludge is mainly as return sludge in the denitrification for denitrification and to maintain a sufficient population density for the microbiological degradation is performed, that the separated aerobically stabilized 'excess sludge by sedimentation in storage tanks, preferably in-situ concrete rectangular tanks or by centrifuges nachentwässert stored and processed agricultural in that the liquid component from the post-dewatering is stored together with the overflow from the secondary clarifier and used for agriculture, since in the liquid component of the BOD, - up to 99% and the nitrogen content up to 75% the polluting odorants eowie w.erden degraded · · · ·. 2 · Method according to item 1, characterized in that the manikin width of the sieve covering of the curved sieve with vibrator ₈ 216501 0.2 χ 0.2 mm to 1.0 χ 1.0 mm, preferably 0.7 x 0.7 mm, is Method according to items 1 and 2, characterized in that the loading conditions in the aeration basin are selected so that the BODC sludge load has a value of 0.053 kg BOD ₅ Ag ST _R · d or BOD ₅ -. Room load in the aeration basin does not exceed a value of 0, 4 kg BOD, - / m · d. 4. The method according to item 1 to 3, characterized in that the recycled into the denitrification basin amount of aerobically stabilized activated sludge 50 % to 200 %. preferably 100 %, the amount of manure to be processed. 5. The method according to item 1 to 4, characterized in that the commissioning of the surface ventilation gyro depending on the content.an oxydiertem nitrogen (nitrite, nitrate) takes place in the aeration basin for optimal energy use. 6. The method according to item 1 to 5, characterized in that the overflow of Nachklärbeckens and the liquid component from the Nacheindickung depending on the content of oxygenated nitrogen (nitrite, nitrate) is stored together with untreated liquid manure from the solid-liquid separation, wherein the ratio BSBc load der.unbehandelten liquid manure from the plague-liquid separation to the oxygen load from the nitrite and nitrate should not exceed the value of 1. Hierz u / f page drawing ο ο η SiT -? h 7 η .ν ύ