RU2564997C2 - Plant for dewatering and disposal of effluents sediments - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to dewatering and disposal of effluents sediments. This plant comprises housing composed of the bed. Bed top part accommodates accumulation vessel equipped with neck, effluents sediments feed pipe provided with shutoff valves. Filtering webs composed of nonwoven hydrophobic polymer bags are arranged in metal support screens secured at the planet bed. Appliances for locking the bags in vertical position and filtrate collection pan. Nonwoven hydrophobic bags are made of polypropylene 20-40 mcm deep so that the number of threads so that threads per 10 cm over warp and weft make 30-36 pcs.

EFFECT: higher efficiency of flirtation, continuous operation in aggressive medium.

1 dwg, 1 tbl

Description

The wastewater sludge dewatering and disposal unit is designed to treat sludge from urban aeration stations.

A known method and installation of dewatering and disinfection of sludge sludge [1], containing filters made of filter cloth and fixed in the upper part on flanges equipped with nozzles for supplying sludge sludge, and also containing containers for collecting filtrate, the filters are made in the form of vertical filter bags, the installation additionally contains receiving accumulation tanks for sludge sludge, to which sludge supply pipes are connected through filtering devices to the filter bags, filter bags have conical or cylindrical-conical shape, and the lower part of the cones is equipped with valves for unloading dry sludge, and inside the filter sleeves are installed nozzles for supplying hot compressed air, extended to the upper part of the valve for unloading dry sludge.

The disadvantage of these technical solutions is the complexity of the installation design and high energy costs, which increases capital and operating costs.

A device for dewatering and disposing of sewage sludge [2], comprising a housing with a pipe and valves for supplying sewage sludge, filter baffles in the form of non-woven hydrophobic polymer bags, devices for fixing the bags in a vertical position and a tray for collecting the filtrate, the body is made in in the form of a bed, the filter baffle is additionally equipped with a bag made of polymer hydrophobic coarse-mesh material inside, inside of which there is an insert made in the form of cards ridge made of hydrophilic porous material, and a perforated pipe is installed in the center of the liner along its vertical axis.

The disadvantage of these technical solutions is the design complexity and low throughput of the installation.

This technical solution is the closest to the proposed invention in its technical essence and the achieved effect.

The aim of the present invention is to increase the throughput of the installation.

This goal is achieved in that the installation for dewatering and disposal of sewage sludge contains a body in the form of a bed, in the upper part of which there is a storage tank equipped with a neck, a sewage sludge supply pipeline with shut-off valves, filter baffles in the form of non-woven hydrophobic polymer bags, located in the metal supporting nets, fixed in the installation case, devices for fixing the bags in an upright position, a tray for collecting the filtrate, hairstyle nonwoven hydrophobic polymer bags made of polypropylene filaments 20-40 microns thick, so that the number of yarns per 10 cm in the warp and weft bag material is in the range 30-35 units.

The invention is illustrated in the drawing. In FIG. 1 shows a schematic diagram of a plant for dehydration and disposal of sewage sludge.

A schematic diagram of a plant for dehydration and disposal of sewage sludge contains: a bed (1), a storage tank (2) equipped with a neck (3), a sewage sludge supply pipeline (4), non-woven hydrophobic polymer bags (5) installed in a metal supporting grid (6). The unit is equipped with a drip tray (7).

The operation of the plant for dewatering and disposal of sewage sludge is implemented as follows: non-woven hydrophobic polymer bags are installed in a metal supporting mesh, secured with clamps on the neck of the storage tank and the storage tank is filled with sludge to be dehydrated. As supporting meshes, woven wire weave nets with square cells with a nominal side dimension of 2.0 mm are used. The dewatering process is carried out in automatic mode, controlled by the control cabinet panel. The process parameters are predefined by the operator based on experimental data. During the dehydration process, a cycle is repeated many times, consisting of filling the storage tank and then filtering through the walls of non-woven hydrophobic polymer bags. The filtration process proceeds at an excess pressure of 0.03 MPa created by the compressor, and continues until the level of sediment drops to the lower edge of the neck of the storage tank. After the time set by the operator, the dehydration process stops, the bags are manually removed from the necks of the storage tank, loaded onto a trolley and transported to a storage location. Thus, in non-woven hydrophobic polymer bags, the process of separation of solid and liquid sediment fractions through the walls occurs under the pressure of the incoming mixture of sediment and air. Humidity of the dehydrated sludge is 75-80%. The equipment is designed for dehydration of 15-180 kg of sludge dry mass. Installation for dewatering and disposal of sewage sludge is made of stainless steel, equipped with a pan for collecting filtration water. Bags with dehydrated sludge are convenient for further transportation and storage.

The studies have confirmed an increase in the throughput of the installation for dehydration and disposal of sewage sludge when using bags of non-woven hydrophobic polymer material made of polypropylene yarns with a thickness of 20-40 microns so that the number of threads per 10 cm of the warp and weft of the bag material is range 30-35 pcs. This material of the bags in contact with wire weaved wire mesh nets with square cells allows the filtering process to maximize the opening of the pores of the non-woven hydrophobic polymer material of the bags, which allows to increase the specific throughput of the material. The research results shown in the table indicate an increased mechanical strength of the material while increasing the efficiency of the filtration itself — the specific throughput increased by more than 30%. The test results in industrial conditions allowed us to conclude that the use of this material increased the duration of continuous operation of plants in an aggressive environment from 300 to 700 hours.

Information sources

1. Pat. RF 2239608, cl. C7 C02F 11/12, C02F 11/18.

2. Pat. RF 2183596, cl. C7 C02F 11/00, B01D 29/27.

Claims (1)

Installation for dewatering and disposal of sewage sludge, containing a housing in the form of a bed, in the upper part of which there is a storage tank equipped with a neck, a sewage sludge supply pipeline with shut-off valves, filter baffles in the form of non-woven hydrophobic polymer bags located in metal supporting nets fixed in the housing of the device, devices for fixing the bags in a vertical position, a tray for collecting filtrate, characterized in that the non-woven hydrophobic polymer bags made of polypropylene filaments 20-40 microns thick, so that the number of yarns per 10 cm in the warp and weft bag material is in the range 30-35 units.

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