DE2703842A1 - METHOD OF CLEANING UP THE JUMPS DURING Cattle Raising In LARGE STALLS - Google Patents

Description

DR.STEPHAN G. BESZEDES PATENT ADVOCATE

806 DACHAU at MONCHEN

POST BOX 11 «

AM HEIDEWEG 2

TELEPHONE: DACHAU 437t

Post account Munich (BLZ TD0100 80)

Account no. 1368 71

Bank account no. 90 637 at Krela- und Stadt · • Parka ··· DKhau-lnderadorf (BU 700 515 40)

P 965

description

for patent application

TATABANYAI SCENBANYAK

Tatabanya, Hungary

concerning

Process for cleaning up the manure produced by keeping cattle in large stables

The invention relates to a new method for cleaning the cattle produced in large stables Manure with a high content of organic matter.

In the modern large stables for keeping cattle wild Litter either not used at all or used only to a limited extent. The resulting excrement and urine are combined with the various trickle waters and the water used for cleaning in below the stables

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Manure channels collected. The concentration of the manure produced in this way depends primarily on the The amount of water used to remove the manure decreases, but exceeds 2% by weight in a large proportion of the houses, The degree of pollution of this liquid manure is 50 to 100 times as much as high as that of municipal wastewater.

Such concentrated manure were previously mainly used as irrigation or sprinkling water in the Agriculture recycled; however, this is associated with numerous difficulties, which is why in recent years also the cleaning of the cattle rearing stations Liquid manure came to the fore.

US Pat. No. 3 7 ^ 5 113 describes a biological cleaning process for cleaning liquid manure with a content of over 1% of organic substances. In this process, the optimum temperature of 40 ^° C. for the mesophilic-thermophilic microorganisms is set spontaneously after a corresponding dwell time. The process is only suitable in the case of multi-stage biological cleaning to produce water of the appropriate quality. Between the individual aerated basins for biological cleaning, the sludge is separated from the partially cleaned water by allowing it to settle.

In WATER POLLUTION CONTROL (197114 ·) are the procedures summarized for the treatment of manure from animal husbandry.

The various processing methods also include aerobic processing of those washed out of the stables Liquid manure in aerated activated sludge basins, lagoons or oxidation ditches. The draining water will

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used for irrigation of arable land. According to the variants described in the publication mentioned, the water withdrawn discontinuously from the anaerobic basin is subjected to an aerobic aftertreatment. In individual cases the canal system running below the stables is designed as an oxidation ditch. The system works as an overflow system without phase separation. The necessary residence time can be several months.

US Pat. No. 3,773,659 is a biological one Purification process for the purification of waste water with a high content of organic substances, in which in one special system obtained under controlled conditions enzymes of bacterial origin of the biological stage of the Cleaning system are supplied, known. The enzymes produced in a separate process are after the addition separated from coagulating chemicals from the fermentation broth. The reaction goes on a large surface in the film phase in front of you, for which a corresponding device is required.

In US Pat. No. 3,763,038, a combined, Chemical-biological cleaning process for cleaning waste water containing organic substances is described. In dnr first stage are used as a coagulating chemical Salts of trivalent iron or salts of bivalent Eir.eno together with an oxidizing agent and optionally ammonium sulfate and lime added and after coagulation the sludge is separated from the water by allowing it to settle ;. If necessary, part of the sludge is circulated returned. The purified water goes into a biological one Purification device with activated sludge and at the same time clarifying agents are added again. As a clarifier In this stage iron salts, the given U;

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combined with an oxidizing agent are used. The purified water is separated from the sludge by allowing it to settle.

The disadvantages of the known methods described can be summarized as follows:

1.) The pollution of biologically treated water is still high, the degree of Cleaning is not sufficient, i.e. the quality of the purified water is sufficient Requirements of the relevant water management regulations are not. Enough pure water can only be achieved through complex, multi-stage biological cleaning will. The addition of the enzymes produced under sterile conditions complicates this Processes that work with only one biological purification stage are also very, as a result the effort and costs of the process are also significantly increased.

2.) If the proportion of solid organic substances is high, the biological degradation proceeds slowly, which is why a long residence time is required in such cleaning systems, which greatly increases the effort and the investment and operating costs.

3.) They complex chemical-biological processes are only proportionate to the purification of manure with suitable for low dry matter content.

Ser invention is based on the task of eliminating

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supply the shortcoming of the known method a method which can be applied to the different cattle breeding systems on a large scale and largely adapted to the situation is that very little flushing water is used in modern systems when removing manure from the stalls will create.

The above has been achieved by the invention.

Subject of. Invention is a method for Raragjung the When keeping cattle in large stables, manure with a high content of organic substances is caused by under Treatment with coagulating chemicals under aerobic conditions, separation of the solid phase from the liquid phase and cleaning of the separated liquid phase in a biological activated sludge stage and with chemicals and separating the solid phase thus obtained from the purified water by allowing it to settle, which is characterized by rok is that in a first stage the liquid manure is homogenized without phase separation under aerobic conditions and only this homogenized liquid manure is subjected to treatment with coagulating chemicals, the subsequent one Separation of the solid phase from the liquid phase is carried out on press belt filters, according to the Entf'nmng of the activated sludge after the biological activated sludge the biologically purified filtrate water is subjected to a chemical post-purification and that afterwards by the festnn Phase separate purified water is neutralized and the precipitate formed in a further settling stage is separated from the purified water.

At the stage of homogenizing the liquid manure without separating the animals, this is expediently balanced out of the qualitative and quantitative fluctuations that occur, kept in slurry and aerated.

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In practice, the method according to the invention has proven to be independent of the different degrees of soiling of the incidental manure has proven its worth, its economic efficiency is already significant if that comes from the stables Liquid manure has a dry matter content of about 1.8% by weight.

Preferably, as coagulating chemicals, before filtering on press belt filters, aluminum sulfate and one or more anion-active electrolytes are used. It is particularly preferred to use the press belt filter per cubic meter manure to be added 0.4 to 1.0 kg of aluminum sulfate and 25 to 50 g of anion-active polyelectrolytes to be used.

Advantageously, the biologically purified filtrate water is used as precipitate in the chemical post-purification Medium lime (calcium hydroxide) was added and with this the pH value of the clarified water was increased 10 to 11.5 set. A pH of 10 to 11.5 for at least 25 minutes is preferred for chemical post-cleaning held.

According to one embodiment of the method according to the invention the neutralization of the high pH value of the cleaned one emerging from the chemical post-cleaning Water carried out by introducing carbon dioxide.

According to another embodiment of the invention RiiKi Ron Procedure will neutralize the high pH values «dor. cleaned by chemical post-cleaning Water carried out by storage for 2 to 4 days :.

According to an advantageous embodiment of the method according to the invention, part of the biological Activated sludge stage separated sludge returned to this.

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According to a particularly advantageous embodiment of the According to the method of the invention, the sludge separated after the biological activated sludge stage, insofar as it is not this is returned, as well as the sludge formed during chemical cleaning and neutralization returned to the manure to be cleaned.

The method according to the invention is based on the following surprising findings:

1.) The storage of the manure resulting from the keeping of animals is for the agricultural Companies mostly a problem. That is why in recent years there have been more and more Manure removal procedures aimed at reducing target the amount of liquid manure, naturalized. This inevitably increases the concentration of the manure.

In the known processes for the treatment of liquid manure, the mechanical-biological Treatment of manure of such high concentration only with extremely long Dwell times are realized and that aur? the device is always draining water still very dirty.

Before the separation of the solid and liquid phases were used as conditioning chemicals Aluminum sulfate and an anion-active polyelectrolyte added. Through own experiments it has been proven that in contrast to the Information in the literature on the use of this combination of chemicals for conditioning The necessary amount of chemicals is not proportional to the dry content of the liquid manure.

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increases, but due to the fiber content of the manure, the necessary amount of chemicals and the water content of the pressed sludge can be reduced considerably. Hence this fiber substances not separated at the beginning of the cleaning process according to the invention, although this mechanically easy to solve.

2.) Even after the biological cleaning, the content of dissolved and colloidal is organic Fabrics very high. Resulting from the digestive system of the animals and the fed feed that a significant part of the organic compounds contained are nitrogenous are protein-like substances. The water leaving the biological cleaning stage also contains those that get into the sludge water during biological cleaning non-degradable metabolic products of the microorganisms.

The easiest way to remove these impurities is by coagulating and then coagulating Adsorption of the proteins. This twofold goal can be achieved by adding the above nl « advantageous precipitating agent specified lime (calcium hydroxide) has been achieved, especially good if after mixing in the lime to coagulate the proteins a flocculation time of at least 25 minutes which has already been mentioned above as preferred is observed will.

Since the usability of the water draining off after cleaning is not only dependent on the

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chemical process measurable impurities, but also to a large extent on its bacterial content is determined, is expediently an essential in the chemical post-cleaning with lime Maintain a pH value higher than that required to coagulate the proteins, namely 10 to 11.5 » and ensured by the residence time specified above that the total germ count of the runoff water is 10 to 10 germs / cm. This draining water is also suitable from a veterinary hygienic point of view, partly in the animal pens to be returned as flushing water, leaving a considerable amount of pure water Water is saved. On the other hand, the small amount of microorganisms enables the cleaned Water after neutralization without dilution water for irrigation of agricultural To utilize usable areas or, if necessary, directly to open water derive.

The most important advantages of the method according to the invention can be summarized as follows:

1.) The inventive method for cleaning liquid manure, the solids can with removes the water content of the solids with a low expenditure of energy and chemicals can be lowered to such a low level that when stored in heaps the natural The composting process of the material starts by itself and becomes a natural manure comparable fermented fertilizer for agriculture is obtained.

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Due to the low level of contamination of the liquid phase resulting from the phase separation it is possible to create a liquid phase through the subsequent cleaning stages, which Contains microorganisms only in small quantities and without dilution water for irrigation agricultural areas are utilized or discharged into the open waters can be produced.

2.) Compared to the known methods, it is an absolute advantage of the method according to the invention, that the cleaning of the liquid manure removed from the stable buildings with a minimum amount of water, whose content of organic substances is high (1.8 to 8% by weight), a water which the today already meets extremely strict requirements for water quality, results. In addition, the cleaning device used in the process can consist of the same process technology Components or technological elements be constructed like the municipal water purification devices, dan means that the production of devices which deviate from the conventionally used is not required.

3.) The high content of organic matter in the liquid manure drops to efcw.i after the biological purification 2 to 5% of its original value, the remaining chemical oxygen demand is abor still very high. Before lowering the W-innor in open water the content of organic Substances are further reduced by the chemical post-cleaning and at the same time takes place in this

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Stage, without incurring any special costs, the sterility of the liquid phase.

4.) In the process according to the invention, the

various sludges that are used in the chemical post-purification of the liquid phase after separation the solid phase incurred, at the beginning of the procedural respectively technological series and so the process has only two end products: The purified water and the pressed sludge.

The method according to the invention is explained in more detail on the basis of the following exemplary presentations in conjunction with the accompanying figure.

The liquid manure arriving in a pump station 1 is conveyed by a pump that has a crushing effect into a homogenizing basin, in which the liquid manure is aerated, kept in slurry and homogenized. Subsequently, aluminum sulfate and an anion-active polyelectrolyte are added as coagulating chemicals.

The crystalline aluminum sulfate is dissolved in a separate solution container and this solution is added from a feed container 3 by means of a metering pump. The nn ~ ion active polyelectrolyte is solved by using a water jet pump in atm under a pressure of 3 stationary tap water and this solution is added from a supply 4 · the exiting on from the Homogenisierbecken 2 manure.

As already mentioned, the dry matter content of the manure coming from the stables is 1.8 to 8 % by weight. Manure to be fed to the filter per cubic meter

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0.4 to 1.0 kg of aluminum sulfate and 25 to 30 g of polyelectrolyte added.

The liquid manure emerging from the homogenizing basin 2 will be after adding the chemicals on a press belt filter 5 drains. The filter cloth of the press belt filter 5 is continuously under a pressure of 3 to 4 atmospheres washed in standing water.

The filtrate water coming from the press belt filter 5 is cleaned in an aerated activated sludge basin 6. The introduction of the air and the constant slurrying is carried out with a rotor with a vertical axis. The necessary residence time is 20 to 30 hours, depending on the parameters of the filtrate water, an activated sludge or active sludge concentration of 6 to 10 g / l ge _T is used and 150 to 300% of the sludge is recycled.

The activated sludge and part of the sludge are separated in a settling tank 7 operating with gravity is fed back into the aerated activated sludge basin 6 with a pump.

For chemical post-cleaning of the biologically cleaned The amount of hydrated lime (calcium hydroxide) in the form of milk of lime is added to the filtrate water from a feed tank 8 that the pH of the clarified water is 10 to 11.5. In a chemical admixing tank 9, the hydrated lime mixed with the biologically purified water and the organic substances are precipitated in a flocculation container 10 and in this their aggregation also takes place. The precipitated organic matter is placed in a sedimentation tank separated from the purified water. The pH of the clarified

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Water is 10 to 11.5 · This high pH is in a neutralizing device 12 by introducing carbon dioxide or by storing for 2 to 4 days.

The sludge excreted during neutralization is in a settling tank 13 separated from the draining water.

The sludge separated during the biological treatment, unless it is returned to the activated sludge basin 6, and the sludge formed during the chemical aftertreatment and neutralization are returned to the pump station 1 .

Furthermore, the method according to the invention is numerically based on the following, which should not be construed as limiting Example explained in more detail.

example

When cleaning 100 parts by weight of cattle manure [chemical oxygen demand (KOI) = 25 to 30 g / l, biological oxygen demand (BOIc) = 12 to 15 g / l and dry matter content = 25 to 30 g / yr . p ': \\, t> r the following purification stages, 20 to 25 parts by weight of sludge are returned. This amount of sludge was added continuously to the 100 parts by weight of liquid manure. The manure was then homogenized with aeration without phase separation. per cubic meter were 0.4 to 1.0 kg of aluminum sulfate [a1 ₂ (S0 ^) x] and 25 to 50 g of anion-active polyelectrolyte; admitted. The so conditioned manure was dewatered on a press belt filter. 20 to 25 parts by weight of pressed sludge, the dry matter content of which was 14 to 15% by weight, were obtained. The approximately 100 parts by weight of the filtrate water obtained during pressing

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Key data: chemical oxygen demand (KOI) = 3.5 to 4 g / l biological oxygen demand (BOIc) «1.6 to 2 g / l and Suspended matter content «1.5 to 2 g / l.

From the sedimentation tank of the biological commendation cleaning were about 15 to 17 parts by weight bio] op; isc)) nr Sludge (dry matter content = 9 to 11 g / l) for manure returned. That accrued after biological cleaning Water had a suspended matter content of 0.3 to 0.5 g / l and its amount was 83 to 85 parts by weight, where further characteristics were as follows: chemical oxygen demand (KOI) = 0.7 to 0.9 g / l and biological oxygen demand (BOIc) »0.15 to 0.25 g / l.

This water was 0.8 to 1.5 kp per cubic meter; Calcium hydroxide {Ca (OH) p ^] mixed in. After depositing of the sludge formed in a phase separator 5 to 7 parts by weight of sludge with a dry matter content of 30 to 50 g / l and 78 to 80 parts by weight of water with the properties chemical oxygen demand (KOI) «0.3 to 0.4 tf / 1, biological oxygen demand (BOIc) »0.04 to 0.06 g / l, suspended matter content = 0.05 to 0.1 g / l and pH value - 11 to H, 5 obtain. The sludge was continuously fed into the process engineering or technological series Liquid manure returned in the circuit and the draining water was introduced by introducing 0.15 to 0.2 l ^ / m * Carbon dioxide neutralized up to a pH value of 8. I) In 0.5 to 1 part by weight of sludge accumulated in the process was separated off in a gravity separator and returned to the manure.

The purified water drained had the following

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Characteristic values: chemical oxygen demand (KOI) »0.3 to 0.4 g / l, biological oxygen demand (BOIc) = ■ 0.04 to 0.06 g / l, suspended matter content = 0.05 to 0.1 g / l, pH value = 7.5 to and total germ count = 10 to 10 ^ germs / cm. The water could be used without restriction for irrigation or watering or, if necessary, drained directly into open water.

Claims 709832/0891

Claims (8)

Claims . .αν .; Process for cleaning the at the cattle hatch Manure with a high content of organic matter produced in large stables by under under aerobic conditions, treatment with coagulating chemicals, separation solid phase from the liquid phase and purification of the separated liquid phase in a biological one Activated sludge stage and with chemicals as well as separating the solid phase obtained in this way from the purified one Water by settling, characterized in that in a first stage the Liquid manure homogenized without phase separation under aerobic conditions and only this homogenized liquid manure subjected to treatment with coagulating chemicals, the subsequent separation of the solid Phase from the liquid phase on press belt filters performs, after the removal of the activated sludge after the biological activated sludge stage biologically cleaned filtrate water undergoes chemical post-purification and that afterwards from the solid phase separate purified water neutralized and the precipitate formed in elnor separates another settling stage from the purified water. 2.) The method according to claim 1, characterized in that one acts as coagulating chemicals before filtering on press belt filters, aluminum sulfate and one or more anion-active electrolytes are used. 3.) Method according to claim 1 or 2, characterized in that the press belt filter is used per cubic meter 709832/0891 INSPECTED -Jf- manure to be added 0.4 to 1.0 kg aluminum sulfate and 25 to 50 g of anion-active polyelectrolytes are used. 4.) Process according to claim 1 to 3, characterized in that the biologically purified filtrate water is used lime is added to the chemical post-cleaning as a precipitating agent and with this the pH value of the adjusts clarified water to 10 to 11.5. 5.) Process according to claim 1 to 4-, characterized in that the pH value is used in the chemical post-cleaning lasts for at least 25 minutes from 10 to 11.5. 6.) Process according to claim 1 to 5, characterized in that the neutralizing of the high pH of the Purified water exiting from chemical post-purification by introducing carbon dioxide performs. 7 ·) Method according to claim 1 to 5 »characterized in that that the neutralization of the high pH value of the exiting from the chemical post-cleaning purified Water by 2 to 4 days lasting La ^ e mnR performs. 8.) Method according to claim 1 to 7 »thereby marked, that part of the sludge separated after the biological BeIeM; -sludge stage is returned to the latter. 9.) Method according to claim 1 to 8, characterized in that that one can use the biological activated sludge; uTe - 18 709832/0891 separated sludge, unless it is returned to this , and the sludge formed during chemical post-cleaning and neutralization is returned to the liquid manure to be cleaned. 709832/0691