RU86182U1 - SEWAGE TREATMENT PLANT - Google Patents

Abstract

A wastewater treatment plant, comprising a tank with a settling tank and a thin-layer sedimentation unit located therein, filters with a floating and sorption loading, standing sequentially after the settling tank, means for supplying initial wastewater to the entrance of the settling tank, a drainage and drainage system for collecting and discharging purified water, characterized in that it further comprises a louvre grille overlapping the sludge pit under the thin-layer sedimentation unit, which is installed in the tank so that the wastewater passes therethrough for upward flow stream and floating filters and adsorption loading are separated by a partition wall, conduits for supplying the regenerant solution, and for supplying the wash water, and a bottom sorption filter loading drain formed with disc switchgears.

Description

The utility model relates to installations for the treatment of industrial rainwater wastewater, with and without treatment with reagents, and can mainly be used in the treatment of wastewater from transport enterprises with a view to their reuse, mainly from oil products and heavy metals.

There are various designs of such plants, intended for wastewater treatment, equipped with a mechanical or sorption filter and thin-layer elements for preliminary high-quality sedimentation of wastewater entering the filtration.

Known combined monoblock installation for cleaning rainwater and contaminated wastewater, comprising a housing with intake systems and a device for distributing wastewater entering thin-layer elements with horizontal, upward or downward flow, a filter chamber with a fixed layer or removable filter loading units, elements for bypassing and draining the treated liquid, and devices for removing sludge (Ivanov V.G., Simonov V.P., Simonov Yu.M. Application of thin-layer sedimentation tanks in ellyulozno and paper industry. M .: Forest Industry, 1989, 176 pp., Ris.74, Figure 75.).

However, this installation cannot provide the deep wastewater treatment currently required, because It provides for wastewater treatment on mechanical filters and does not have a device designed for sorption treatment.

Known installation of storm water treatment (RU No. 2289548, С02F 1/40, publ. 2006.12.20). The installation comprises a receiving storage tank, made in the form of a horizontally placed cylinder, in which treatment facilities are installed, including sandbins, the first stage of the unit for separation of suspended particles and oil products, made in the form of a thin-layer module from a tube bundle made of a material having a high coalescence coefficient, and the second stage of the unit for separation of suspended particles and oil products, made in the form of a tank filled with freely floating granules of material, about frankincense high coefficient coalescence. A block of the third stage of sorption water purification is additionally installed inside the receiving storage tank; zeolite, shungite, activated carbon can be used as sorbents. The wastewater is supplied from the reservoir to the first stage of the block into the chamber with thin-layer sedimentation by a submersible pump, then the wastewater enters the sorption filter.

As you know, the use of tubular elements of various shapes in many cases leads to cost overruns and unstable operation due to clogging by sediment, and the issue of removing settled contaminants from the surface of the bottom of the tank has not been resolved either. The sorption filter has a slight sorption capacity. Due to the location of the sorption filter inside the tank, the regeneration and replacement of sorbents will contribute to its frequent and prolonged suspension. Installation of an additional pump for supplying wastewater to the first stage of treatment can significantly complicate the operation of the installation and lead to additional costs.

Also known installation for cleaning liquids from oils and suspended solids (RU No. 2067081, С02F 1/40, publ. 1996.09.27). The apparatus for cleaning liquids from oils and suspended solids contains a sewage supply pipe, a housing divided by vertical partitions into coarse cleaning sections with means for trapping oils and suspended solids, thin-layer separation with a block of inclined plates and collecting purified water, an oil sump communicating with the oil collecting tray, a system for removing sludge, a post-treatment section, located after the thin-layer separation section with a filter element consisting of a layer of wood flour, limited to the top and bottom of the fine ball istoy mesh of stainless steel, the inclined plate of a thin separation unit are corrugated, with one side coated with a mixture parafinovazelinovoy, T-shaped nozzles aimed in oil-gathering chute connected to discharge openings of a small diameter made in the upper part of the longitudinal wall of the housing.

Due to the constructive unsolved problem of combining thin-layer elements, mechanical and sorption filters in one monoblock combined construction, as well as their effective washing and regeneration, washing is provided for separately. It is impossible to place the sorption filter directly behind the mechanical filter and ensure its regeneration; therefore, the sorption filter is placed separately or it is envisaged to replace the sorption filter with a new one after its depletion, which reduces the quality of wastewater treatment, its performance and complicates operation.

Closest to the proposed technical solution is the installation "Svir" (Ivanov VG, Chernikov NA Drainage systems of industrial enterprises. - St. Petersburg: Publishing House OM-Press, 2007. fig. 13.8 p. 219), intended for cleaning rainwater wastewater contaminated with clay particles, sand and oil products. It is a reservoir, with a settler located in it with a thin-layer sedimentation unit for downward flow of the stream, a hopper bottom and a filter, a means of supplying initial wastewater to the inlet of the settler, a device for collecting and discharging purified water in the form of high-resistance drainage, and a device for removing sediment washing the floating filter with the removal of dirty wash water by drainage of low resistance. The sorption filter of the Svir installation is made stand-alone.

The liquid to be cleaned enters the settling zone, where coarse particles and floating oil products are released, as well as finely dispersed contaminants that are collected by the oil collection rotary pipe and are discharged from the structure, and the thin-layer elements of the unit operate in a downward flow of liquid, then water flows through the overflow to a mechanical floating filter and is removed from the installation through tubular drainage of high resistance to a separate sorption filter made in the form of a steel rectangular capacity.

The disadvantages of this design is the lack of switchgears in front of the thin-layer sedimentation unit, which, with a significant amount of the rough cleaning zone, the installation does not provide efficient flow distribution. The module of thin-layer sedimentation with a downward flow, the upper part of which is located in the accumulation zone of oil products that are periodically removed, is not able to efficiently remove fine impurities, it does not provide a device for the efficient removal of oil products that will affect the duration of the filters, it is possible to stir up the sediment in the bunkers downward-upward flow of fluid leaving thin-layer elements. The sorption cleaning unit cannot be placed in one housing with a sump and a mechanical filter because of the constructive impossibility of an acceptable solution to the general washing and regeneration system of both mechanical and sorption filters. Operation of the installation, which occupies significant areas, is associated with certain difficulties.

The objective of the utility model is to increase the efficiency of wastewater treatment and purification with an increase in productivity due to a more optimal flow distribution between thin-layer elements.

The technical result is achieved by the fact that the wastewater treatment plant comprises a tank with a settling tank and a thin-layer sedimentation unit located in it, filters with a floating and sorption loading, standing in series after the settling tank, means for supplying the initial wastewater to the entrance of the settling tank, drainage and drainage devices and devices for collecting and discharging purified water, additionally contains a louvre grille that overlaps the sludge pit under the thin-layer sedimentation unit, which is installed in the tank so that the wastewater passes through it in an upstream flow, and the filters with floating and sorption loading are separated by a vertical partition, pipelines for draining the regenerating solution, for supplying the regenerating solution and for supplying the washing water, and the filter bottom with sorption loading drainage with disk distribution devices.

Figure 1 presents a diagram of the proposed installation for wastewater treatment in section.

Figure 2 is a top view of the installation.

The wastewater treatment plant comprises a tank with a settling tank 1 located therein, means for supplying initial wastewater to the inlet of the settling tank 2, a rotary pipe for removing oil products 3, a limiter for the zone of accumulation of oil products 4, a thin-layer sedimentation unit 5, channel 6, a vertical partition, the upper part which is made in the form of a spillway 7, a filter with a floating load 8, floating loads 9, a dividing wall 10, a bypass pipe with a check valve 11 which is also designed to divert the regenerating water solution, distribution - drainage collector of the filter with sorption charge 12, filter with sorption charge 13, bypass pipe for drainage of the regenerating solution 14, charge of activated aluminosilicate adsorbent 15, drainage bottom 16, disk distribution devices (for example, drainage slotted caps) 17, pipelines for supply of a regenerating solution 18, a pipeline for supplying washing water 19, a pipeline for draining purified water 20, a drainage and drainage system 21 of a filter with a floating charge and usknoy conduit for discharging the washing water, sludge pit 22 louvre 23, the dirty washing water pipe 24, pipes 25 to remove sediment.

The operation of the installation is as follows.

The liquid to be cleaned is supplied from the installation end to the settling zone, coarse suspended solids and oil products are settled along the water flow path from the beginning of the sump 1 to the inlet section of the thin-layer elements of the thin-layer sedimentation unit 5, made of corrugated plates, in which the settling process is completed and the bulk of the finely emulsified oil products are removed and suspended fine substances. Next, the purified water through a vertical partition, the upper part of which is made in the form of a spillway 7, enters the filters with a floating load 8, where the floating load 9 is located between the grids, then through the bypass pipe with a check valve 11 and a distribution-water header 12 to the filter with sorption charge 13, loaded with activated aluminosilicate adsorbent 15, which provides for its deep purification by mechanical filtration and sorption of fine impurities. The purified water through the drainage bottom 16 with disk distribution devices 17 is discharged from under the drainage space of the filter with a sorption charge 13 through a pipeline to drain the purified water 20.

Improving the cleaning efficiency and plant productivity in wastewater treatment is also achieved thanks to the louvre grille 23, above the sludge for collecting sludge 22, which forms, with an inlet section of a block of thin-layer elements 5, an upward flow of liquid in them (optimal for sedimentation of suspended solids), a narrowing inlet channel providing more uniform distribution of the water flow between the elements of the thin-layer sedimentation unit 5. At the water outlet from the thin-layer sedimentation unit 5 special channels 6 for drainage trapped petroleum products in the accumulation zone, excluding their slip into filters with a floating charge 8, provide better retention of finely dispersed suspended fractions in the block of thin-layer sedimentation 5, protection of the filter with a floating charge 8 and the filter with sorption loading 13 from possible sludge due to the removal of contaminants from zone settling in the sump 1 in the filtration zone. The grids provide a fixation of the position of the floating charge 9 under various operating conditions of the installation, an efficient and economical technology of washing the filter with a floating charge 8 and a filter with a sorption charge 13. An increase in productivity is ensured by the design of the separation wall 10 between the filters 8 and 13 with the possibility of overflow through it and the bypass system liquid from the filter with a floating charge 8 into the filter with a sorption charge 13, automatically shutting off the bypass pipe with a check valve 11 between ltrom floating load 8 and a sorption filter 13 at loading washing and regenerating activated aluminosilicate adsorbent 15, monoblock installation with regenerating activated aluminosilicate adsorbent 15 without taking it out of the sorption filter 13 loading.

Contaminants trapped in the thin-layer sedimentation unit 5 are removed independently beyond their limits: suspended solids in the sump for sediment 22 of sedimentation tank 1, and oil products in the zone of their accumulation for removal using a rotary pipe to remove oil products 3.

The washing of the filter with sorption charge 13 is carried out from the washing pump through a high-pressure drainage system with disk distributors 17, where water is supplied through the pipe for supplying washing water 19, while the washing of the floating charge 9 is provided with the same water supplied to the filter with a floating charge 8 through the spillway of the separation wall 10 between the filters. Dirty wash water is discharged through the drainage filter system 21 of the floating filter 8 and the dirty wash water pipe 24; for sorbent regeneration, water is supplied through the pipe for supplying the regenerating solution 18.

Claims (1)

A wastewater treatment plant, comprising a tank with a settling tank and a thin-layer sedimentation unit located therein, filters with a floating and sorption loading, standing sequentially after the settling tank, means for supplying initial wastewater to the entrance of the settling tank, a drainage and drainage system for collecting and discharging purified water, characterized in that it further comprises a louvre grille overlapping the sludge pit under the thin-layer sedimentation unit, which is installed in the tank so that the wastewater passes therethrough for upward flow stream and floating filters and adsorption loading are separated by a partition wall, conduits for supplying the regenerant solution, and for supplying the wash water, and a bottom sorption filter loading drain formed with disc switchgears.