SU1409597A1 - Installation for treating waste water sediment and producing compost - Google Patents

Abstract

This invention relates to the biothermal treatment of organic sewage sludge and the preparation of compost. The purpose of the invention is to increase plant capacity and. shorter processing time. The installation is a tank 2, divided by partitions 3 into compartments 4, 5 and 6 with a volume ratio of 1.5-2.5: 4.5-5.5: 1-1.5. The waste to be treated biothermally is fed through an e-load.

Description

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H-3 bunker 1 in 3-section container 2 with grab. The mixing of the processed waste in compartments 4, 5 and 6 is made by devices 7 ,. placed on mobile carriages. 8. Overloading and unloading of the processed waste is carried out with a grab. The middle compartment 5 is provided with a fan 11 connected to the first compartment 4. The installation reduces the duration and intensifies the decomposition of the organic matter of the sediment according to the stages of the process. In the first compartment, the process takes place in

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The invention relates to the treatment of organiferous sediments of municipal and industrial wastewater and municipal solid waste in order to obtain fertilizers and can be applied to 5 municipal and industrial wastewater treatment plants, as well as waste treatment plants.

The purpose of the invention is to increase plant productivity and shorten the process time.

FIG. 1 shows the proposed installation, plan view; in fig. 2 shows section A-A in FIG. one.;

The installation for treatment of sewage sludge and compost preparation consists of a hopper 1, i of tank 2 in the form of a trench divided by partitions 3 into compartments 4, 5 and: 6, mixing devices 7, and

innovated on mobile trucks 8 with drives 9 in compartments 4, 5 and 6 ,. ; grab 10 on a monorail or cable car, and also a fan 11 connected to perforated pipes 12 mounted in compartment 4.

In accordance with the stages of the process, the installation capacity is divided into three compartments with a volume ratio of 1.5-2.5: 4.5-5.5: 1-1.5, each of which has its own mixing device, which allows reduce the duration of the process and provides composting of waste in compartments in different modes with the necessary oxygen consumption, corresponding to

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mesophilic plants, in the second compartment the process is carried out in a thermophilic mode at 50-70 ° C, with the bulk of the organic matter decomposing, disinfection and reduction of sludge moisture is achieved by evaporation of a part of moisture and its consumption by microorganisms during their life. In the third compartment, the process proceeds in the mesophilic mode at 30–40 ° C. Moving in the compartments allows the compostable precipitate to be effectively saturated with air. 1 h, para. f-ly, 2 ill., 2 tabl

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different stages of the microbial composition of the waste.

The plant for the treatment of sewage sludge and composting works as follows.

The organo-containing waste to be treated (mechanically dehydrated or dried sewage sludge from sludge plots) is loaded through the hopper 1 into the tank 2, formed as a trench. Compost from the third compartment or filler (sawdust, peat, plant tops, foliage, bark or household waste) is added to the grab 10 to reduce the moisture content and adhesion of the sludge. The waste is mixed with the filler and the mixture is fed to the treatment with a grab 10, which feeds the mixture into the first compartment 4 of a three-section tank 2. In the first compartment 4, the mixture (waste) is exposed to aerobic mesophilic microorganisms. For air, homogenizing mixtures are mixed with air by means of mixing devices 7, rotating reversibly and mixing on carriages 8 with drives 9 in the first 4, second 5 and third 6 compartments. The sediment is overloaded from the first compartment 4 to the second compartment 5 and to the third compartment 6, as well as its unloading is performed with a grab 10.

In the secondary compartment 5, the biothermal process occurs in a thermophilic

the mode at 50-70 0. In the third compartment 6, the temperature drops to ZO-AO C

The resulting compost from the third compartment 6 is discharged by the grapple 10 to the storage and ripening ground or to the vehicle.

To increase the amount of air supplied to the first compartment 4 and prevent freezing of compostable waste in it during cold time, the installation is equipped with a fan 11, which takes warm air from the second compartment 5 and feeds it to the perforated pipes 12 installed in the first compartment 4.

Comparative data indicating the effectiveness of the selected ratios of compartment volumes are presented in Table. one.

From tab. 1, it can be seen that the use of the proposed plant for biothermal treatment of organ-containing wastes as compared with the prototype reduces the duration of the process from 9–13 to 7–9.5 days. This is achieved by dividing the tank into compartments corresponding to the phases of the biothermal process.

Data on the duration of the process, depending on the content of organic matter in the waste (sediments) and their moisture content are given in Table. 2,

Example. Composting is subjected to organic waste — me. —Ananically dehydrated sewage sludge with a moisture content of 70%, ash content of 32% at a sewage treatment plant with a throughput of 20 thousand. Sludge moisture content is 96.2% and 150 m / day. The amount of dewatered sludge is

nineteen . For biothermal treatment, a device is

sediment

5 of three compartments with volumes of 60, 150 and 30 m and loading hopper with a volume of 3 m. Sizes of compartments: first

2.5m - base, 2.5 m - height and

9.6m is the length of the second 2.5-2.524 and the third 2.52.5-5 m. To reduce the moisture of the composted sludge to 60%, ready-made compost with 40% humidity in the amount of 0.5 per 1 m is dewatered to the receiving bin

foot sediment. The compartments are equipped with paddle stirrers stirring the sediment. Duration of stay

in compartments is 2.5 and 1 day. only 8 days. Compost is directed to storing and ripening on an adjacent asphalt pad. The application of the proposed plant allows to shorten the composting process and reduce the volume of facilities for biothermal treatment of organ-containing wastes.

Claims (2)

1. A sludge treatment and composting sludge treatment unit containing a hopper, a trench-shaped tank, mixing devices mounted on mobile carriages, and a grab, in order to increase plant productivity and reduce the duration of the process. it is equipped with partitions installed in the tank and dividing it into three compartments with a ratio of 1.5-2.5: 4.5-5.5: 1.0-1.5, and mixing devices are installed in each compartment. 2. Installing noH.I, exe It is equipped with perforated pipes placed in the first compartment with exhaust fan communicated with the middle compartment. -.-TE;  I /// / ft at fff /// eri 2