SU1733408A1 - Device for compaction and dehydration of sediment - Google Patents

Abstract

The invention relates to the compaction and dewatering of sediments and can be used to process sludge from metallurgical production. The purpose of the invention is to reduce land areas occupied by sewage sludge, to increase the efficiency of compaction and sedimentation processes by combining their sedimentation and dewatering processes. The device is made in the form of a system of reinforced concrete bins with successively arranged planes with drainage trays along the bottom perimeter and in the walls of the bunker filled with filtering material (coke, crushed stone). The device operates in alternating mode. 3 il.

Description

The invention relates to the compaction and dewatering of sediments and can be used in various areas of the national economy, in particular for processing sludge from metallurgical production.

The known silt is a platform containing a system of drop-down and transportable drainage vertical filter elements installed on the platform, made of perforated containers, equipped with an organic filler material and a drainage pipe with docking stations.

The well-known sludge bed provides increased utilization through a dewatering process, reduced capital costs and recycling of organic filter material as a fertilizer.

However, the use of the known sludge bed is limited to the type of water being purified (natural, sanitary, fecal). It is suitable for industrial waste due to the presence of an organic filtering material (reed grass chopped stems and

t p.) capable of going to fertilizer together with precipitated particles from the treated water. In addition, the constant rearrangement of containers from the card requires the presence of attendants, i.e. large labor costs for maintenance.

The purpose of the invention is to increase the efficiency of compaction and sedimentation dewatering processes by combining pulp sedimentation and sedimentation dehydration regimes.

Fig 1 shows the device, the plan; Fig 2 - section aa in Fig 1; on fig.Z - section bb in fig. one.

The proposed device consists of hoppers 1. around the perimeter of the bottom of which are laid internal drainage trays 2 and external drainage trays 3, vertical drainage 4 embedded in the wall of the hopper 1 slurry pipe 5. trays b for draining clear water, railway track 7 for transporting dehydrated sludge and grab crane 8 for cleaning bunkers and loading sludge Bins 1 are built in plan and are cascaded

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(FIG. 2) Along the perimeter of the bottom of each bunker 1, an internal drainage tray 2 is made, filled for drainage with coke and covered with a perforated steel sheet to drain water from each bunker to the external drainage tray 3 that goes along the bunker 1 At the corners of each bunker and in the middle part of the side its longitudinal walls are embedded in drainage 4, connected to tray 2 along the bottom perimeter and filled with coke. To the end part of the bins, the slurry pipelines 5 are delivered independently to each bunker of the first and third rows in a cascade with the distribution of pulp across the entire width of each bunker. From the third cascade sideways along both sides of the bunker are placed trays 6 for drainage of clarified water.

A rail track 7 is laid on one longitudinal side of the bunkers to transport dehydrated sludge and a grab crane 8 is installed above the device to clean the bunkers and load sludge

Example For reinforcing and dewatering pulp with a solids content of 200-700 g / l and a particle size of 10-100 µm, reinforced concrete bunkeoi 1 with dimensions of 4x10x4 m were used.

The drainage tray 2 has a width and a depth of 0.3 m. For drainage, coke is used in pieces of size 20–25 mm. The drainage has a cross section of 0.1x0 3 m. The width of the bunker and the distance between the vertical drains provide uniform sludge dewatering.

The device works as follows.

Condensed pulp in the amount of 30-60m3 / h is fed from the upper end to one of the three bunkers with uniform distribution across the width of the first and second bins in the cascade. The clarified water is diverted from the full width of the second end in a pair of cascade bunks to the clarified water conduit. filling the second buoy with sediment when the clarified water quality deteriorates, the pulp supply is switched to the second pair of bunkers of the same cascade, and the first pair opens the valve at the drainage water outlet and switches the operation of the first two bins to f ltratsii and sludge dewatering After filling, the second pair of hoppers also converted to filter mode and dewatering

The dehydrated sludge is discharged by a grab crane into the transport for disposal.

This mode of pair filling bins increases the maneuverability of work

device, increases the time for the mode of the source, inspection or repair of the device provides a complete first bunker sludge and incomplete filling

second bunker

It is possible to operate all four cascade bins in the sludge mode, the other four bins R, the filtering and dewatering mode and the third four bins.

0 in the mode of unloading, inspection and remot. In this mode, the operation scheme is simplified, the top three buggers of the cascade are completely filled, but they decrease maneuverability and unloading, inspections and repairs.

5 The work of UST on a tlama or wet gas scrubber sglomergun and blast furnace production with a filtration rate of up to 1 m / cyi was investigated. Soon and soon, the slimes allow i to work in the next alternating mode in one row of cascades in the bunkers in the bunkers from the sludge in another mode in sludge sludge mode, the third in sludge dewatering mode S rg - during device operation, press each p and alternate

Stirring the shgam and SGRUSHTRLYAH before applying to the device, it contributes to the improvement of sludge dewatering due to the averaging of particles

0 Condensed pulp in such quantity

at the indicated sizes of the bunker, they mainly provide the effect of sedimentation of weighted neck substances in standing water with a uniform averaging and draft of the part;

5 different sizes than uplifting

Replacement of the filtering loading (coke) and drainage trays is carried out 2 times a year. The device ensures the moisture of the sediment.

0 from wet gas scrubbers of sintering and blast furnace production after sludge without dehydration of about 30%. The rate of filtration of the indicated Shl-emovs was 0 g not less than 1 m / day, the humidity of the dehydrated

5 cuttings 12-18%

The proposed device takes up from 8 to 12 times less area than the upper platforms by increasing the thickness of the sludge, has an increased gravitational ability to compact and dewater the sludge and the moisture content of the product, similar to dewatering on vacuum filters

Claims (1)

Invention Formula 5 Compaction and dewatering device take sediments containing a system of filter tanks with loading, slurry pipelines of illuminated water pipelines, drainage trays and vertical drains, characterized by th, s To increase the efficiency of compaction and sludge dewatering by combining pulp sedimentation and sludge dewatering, the filter tank system is designed as a cascade of rectangular bunkers arranged in rows, drainage trays are located along the perimeter of the bins, vertical drains are in the walls of the bins, and slurry lines and pipelines of the illuminated brighter ones. attached to the bunkers of the first and subsequent odd rows 5Fig 1 5 1 A- A