SU1260364A1 - Method of dewatering bird dung - Google Patents

Description

The invention relates to agriculture, in particular to the poultry industry, and can be used in the processing of poultry manure (PP).

The purpose of the invention is to increase the degree of dehydration of the litter.

Example 1. The collection with a megaal, which is 1.1 m in volume, continuously enters the chicken dung with a humidity of 80% in an amount of 10 t / h, while water supply for its dilution to a humidity of 94% in an amount of 34 m / h is uninterrupted. The working volume of the liquid in the collector is maintained at 0.75 m, which corresponds to a mixture residence time of 1 min. The molded slurry is continuously withdrawn from the collector and is pumped into mixer No. 1 for the introduction of lime in the form of lime milk suspension with a CaO concentration of 150 g / l in an amount of 4 m / h. The working volume of the liquid in mixer No. 1 is 0.7 m, which corresponds to a mixing time of about 1 minute. The resulting suspension is continuously fed in the amount of 48 m / h to mixer No. 2 to introduce 15% hydrogen peroxide in an amount of 0.2 m / h. The working volume of mixer No. 2 is also 0.7 m.

The resulting suspension is continuously fed to an industrial continuously operating vacuum drum filter brand VSHOU - 40 - 3.4 (a filter with a converging web and a working filtration surface of 40 m). The discharge of dehydrated litter was 6.2 t / h (the moisture content of the filtrate was 42 m / h. Of these, h served to dilute the litter to a concentration of 94%, and 4 m / h was drained into the sewage system. The dehydrated litter is a solid, non-smelling sediment , almost odorless.

Example 2. In a laboratory glass beaker with a capacity of 200 ml, 25 g of PP sample from the Arkhangelsk poultry farm were placed with a humidity of 80%, 74 ml of tap water was added, while the humidity of the mixture was 94%, mixed for 1 minute. Then, 15 ml of milk of lime with a calcium oxide concentration of 130 g / l were introduced into the suspension with stirring. Mixture

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63%), 34 m7

re-mixed for 1 minute and filtered - 55 PP 64%.

under vacuum at 400 mm Hg. on a porcelain filter funnel with a diameter of 74 mm. The filtration duration was 3 min 42 s. From this, the filtration performance of the dry matter was calculated (14 kg / m -h). The moisture content of dehydrated bird droppings is 67%. Lime consumption per CaO 52%.

Similarly, dehydrated Ш1 at various dosages of lime.

The dosage of lime and the efficiency of dehydration are presented in table. one.

Table 1

Efficiency of dehydration depending on the dose of lime

Presented in table. 1 data shows that the dosage is less than 28%. does not provide the required degree of dehydration.

Example 3. 25gW1 with a humidity of 76% under the conditions of example 2 was mixed with 75 ml of tap water (to a moisture content of 94%) for 1 minute. Then, 20 ml of lime milk with a concentration of 130 g / l was introduced into the suspension with stirring. The mixture was mixed for 1 minute, 2 ml of 2% phosphoric acid was added, mixed again and filtered as in Example 2. The specific filtration capacity was 28.6 kg / m-h. The specific consumption of CAC is 28%; specific acid consumption 0.59%; moisture dehydrated

25 g of PP were treated in the same way under the conditions of this example, however, the stirring time was

31260364

with water ranged from 0.5 to min.

The results of the experiments are presented in table. 2, it is shown that the optimal duration of this stage is about 5 Gmin.

table 2

Dependence of filtration efficiency on the duration of mixing at the stage of manure dilution

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with about

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more than 5 years old

Specific filtration rate, kg / m h

Example 4. 25% moisture of 76% under the conditions of example 2 was treated in the same way as in example 3, however, instead of 2 ml of phosphoric acid, 2 ml of 1N was added. sulfuric acid. The specific filtration capacity was 16.5 kg / mh. Acid consumption 1.45%; dehydrated PP 66%.

When used under similar conditions, HC 1 specific capacity was 16.5 kg / m - h. Specific acid consumption was 1.08%; moisture content of dehydrated PP 65%.

Example 5. 25gWh1 with a humidity of 80% under the conditions of example 2 was treated as in example 3, but instead of 2 MP 2% phosphoric acid, 0.5 ml of water peroxide was added. sort of concentration of 185 g / l. Specify performance was 52 kg / m -h. The moisture content of dehydrated PP 63%.

The experiment was repeated at a flow rate of 1 ml of hydrogen peroxide, while the specific productivity was 58.4 kg / m h, the moisture content of the dehydrated PP was 62%.

Example 6. The process was carried out analogously to example 2, however, the PP sample was suspended not in tap water, but in the filtrate obtained in example 2, which was before

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ten

25

the mixture with the sample was acidified to pH 6. The specific productivity of the filtrate was 14 kg / m h, the moisture content of the dehydrated CPU was 67%.

The experiment was repeated 4 times using the filtrate from the previous experiment in each subsequent experiment. Productivity at the same time did not decrease, and humidity did not increase.,.

When diluted to a moisture content of less than 94%, the filtration capacity of the suspension decreases significantly, and when the moisture content exceeds 94%, it slightly increases, however, a heavy dilution leads to an increase in the total flow to filtration. In addition, with a humidity of 94-95% PP, it has a satisfactory transportability and can be pumped through 20 pipelines.

Mixing G1 with reagents can be carried out in one of three ways: mixing with lime; sequential mixing with lime and mineral acid; subsequent mixing with lime and hydrogen peroxide.

These options provide different performance filtering suspension. In the processing of G1 in the first embodiment, the lime is introduced into it with stirring, for example, in the form of milk of lime with a concentration of 120-200 g / l. The introduction of lime 5 milk leads to a dramatic improvement in moisture recovery and filterability of the suspension. The duration of mixing is 0.5-1 minutes, after which the mixture is immediately filtered. Since the degree of moisture loss and filtration rate depends on the consumption of lime, it is necessary to carry out the treatment with lime at a consumption of 28–52% relative to dry PP.

In the second variant, lime is introduced into the slurry of the PP in the same way as in the first variant, and then, after 0.5-1 minutes of mixing, mineral acid is added to the resulting mixture, in (- primer HCl, in the amount of 0.3 -3.3% with respect to dry P1, re-stirred for 0.5-1 minutes and sent for filtration. To use dehydrated PP 5 as feed, it is preferable to inject, because when interacting with lime, calcium monophosphate is formed, which t in

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0

The diet of animals as a source of phosphorus and calcium.

In the third variant, lime is added to the slurry of PP with mixing (as well as in the previous versions), and then an aqueous solution of hydrogen peroxide with a concentration of 15–20% in an amount of 2.5–15% of 100% peroxide relative to dry Pp The mixture is stirred for 0.5-1 minutes and filtered.

Filtration of the resulting mixtures can be carried out on commercially available equipment, for example, HP ribbon filters, vacuum filters, FPAKM filter presses, etc. At the same time, the specific filtration capacity is determined mainly by the type of reagent introduced into the slurry. Thus, when lime is treated with a slurry, the specific capacity is 13–16 kg / m h /, and when using lime with hydrogen peroxide it is up to 59 kg / m h. Thus, the most effective from the point of view of filtration is lime batch processing. in combination with hydrogen peroxide. By using this reagent system, the purest filtrates are obtained. In addition, HjOj is a strong sterilizing agent.

After the filtration stage is completed, the dehydrated PP is fed for drying, and the filter is partially fed to the sewage system, and partially to the dilution of the original G1. Performing multiple recirculation of the filtrate according to options in which PP treats lime with a combination of acids or peroxide does not impair the filtering of the precipitate. In the case of PP treatment with lime only, the filtrate must be acidified with a mineral acid to pH 5-6 before being fed to the dilution step.

Editor A. Ogar

Compiled by L. Rubinova

Tehred I.Popovich Proofreader 0. Lugova

Order 5188/20 Circulation 419, Subsidiary VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4.

If it is necessary to dry dehydrated PP for use as a fertilizer, it is preferable to carry out drying not in gaseous products of fuel combustion (the lime contained in it remains the most active).

When using dehydrated PP as feed, it should be thermally dried in a stream of gaseous coolant, for example, from burning fuel oil, since in this case lime contained in PP is converted to calcium carbonate (or

chalk), which has an independent feed value.

In comparison with the known chemical reagents for the treatment of liquid organic waste, ferric chloride or aluminum sulphate, the reagents offered are more effective for the treatment of PP suspension. Under the conditions of example 2, at a dosage of ferric chloride 15 ml the moisture content of the dehydrated

W1 was 88% with a specific filtration capacity of 3.1 kg / mh. With the same dosage of aluminum sulphate solution, the moisture content of the dehydrated PP was 87% with a specific productivity of filters and 2.8 hours.

The proposed method reduces the moisture content of PP at the stage of mechanical dehydration to 64%, which

makes it possible to reduce energy consumption at the stage of subsequent drying of PP. Due to the reagent treatment, G1 loses an unpleasant odor, and consequently, its consumer properties are improved. The proposed technology does not require the development and use of special equipment. In addition, the product obtained by the proposed method is enriched

calcium and phosphate, which improves its properties.

Claims (2)

1. METHOD FOR DEHYDRATING BIRD LITTER by diluting raw litter with water and subsequent mechanical filtration, characterized in that, in order to increase the degree of dehydration, the dilution is carried out with stirring for .1-1.5 minutes to a moisture content of at least 94%, and before by mechanical filtration, the diluted litter is treated with lime in an amount of 28-52 wt.% in relation to the dry litter. 2. The method of pop. 1, distinguished by the fact that, in order to further increase the degree of dehydration, before mechanical filtration, 2-15 wt.% In addition to dry peroxide of hydrogen peroxide or 0.3-3 are added to the diluted manure treated with lime, 3 wt.% Mineral acid. (L s