RU2082480C1 - Thin-layer settling basin - Google Patents

Abstract

FIELD: treatment of household and industrial sewage waters. SUBSTANCE: sewage waters are introduced through device of admission to forebay, where jet kinetic energy is dissipated and supplied further on through long slot to distribution chamber, which distributes water uniformly over the cross-section of lower pack of inclined plates. Passing through lower pack, coarse heavy and light suspended particles are settled on surfaces of rarely spaced plates. Difficult-to-settle suspended particles rise to upper pack and are settled on the surfaces of closely arranged plates. So, coarse purification takes place in the lower pack, and fine purification, in the upper pack. Formed sediments slips from plates in form of coagulated nodules and pass through distribution chamber without disintegration and settle in the body lower part, from which they are withdrawn through the unit of sediments removal. EFFECT: higher uniformity of distribution of sewage water over the entire cross-section of pack, higher degree of settling of fine suspensions and prevented repeated disintegration of settled coagulated suspension nodules. 2 cl, 1 dwg

Description

 The invention relates to the treatment of domestic and industrial wastewater, namely to settling tanks.

 Known thin-layer sump for wastewater treatment, containing an inclined body with a reaction chamber, an inlet cone, inlet and outlet pipelines for supplying and discharging purified water, a package of inclined elements and a sediment collector attached to the lower side surface of the housing in communication with the reaction chamber with an aperture (auto St. USSR N 1546099, class B 01 D 21/00, publ. 02.28.90). Wastewater is fed into the sump through the inlet pipe, at the outlet of which the wastewater is evenly distributed over the cross section of the inlet cone under the action of the flow guide and in parallel streams enter the reaction chamber. Then the purified water passes through the package of inclined elements and the outlet cone.

 The disadvantage of a thin-layer sedimentation tank is that in the reaction chamber light suspended solids move along its upper inclined wall, and heavy suspended substances along its lower inclined wall. As a result, the wastewater exfoliates in the reaction chamber before entering the bag. Inclined elements adjacent to the upper inclined wall of the reaction chamber turn out to be overloaded with light suspended substances, and adjacent to the lower inclined wall with heavy suspended substances, which reduces the quality of cleaning. In addition, a large production area is required to accommodate a settling tank with an inclined housing.

 Closest to the proposed is a thin-layer sump (ed. St. USSR N 1510866, class B 01 D 21/02, C 02 F 1/52, publ. 30.09.89). Containing a housing with a front wall in which the upper and lower packages of inclined parallel plates are installed, an input (cleaned) liquid input device located in the lower part of the body, a clarified liquid output device, a pickup pocket for collecting a light phase and a sediment removal unit. The pickup pocket communicates via a prefabricated collector with an easy phase collection chamber.

 The clarified liquid output device is adjacent to the collection pocket. The input liquid input device includes a supply pipe attached to the front wall of the housing, and a perforated pipe mounted under the lower package of inclined plates.

 In comparison with the above-described thin-layer sump, this sump provides a higher quality of cleaning, since the water to be purified passes sequentially through two packages of plates and is more evenly distributed between the plates. In addition, less floor space is required to house a sump.

 However, the quality of the wastewater treatment in this sump is still not high enough, since the wastewater flowing from the perforated pipe creates turbulent swirls that prevent sediment from settling on the surface of the plates. Coagulated lumps of suspensions, sliding from the plates, fall into the zone of action of the jets flowing from the perforated pipe, and again collapse, which prevents the settling of thin suspensions.

 The objective of the invention is to increase the uniform distribution of the treated wastewater over the entire cross section of the package, to increase the degree of sedimentation of thin suspensions and to prevent re-destruction of sedimenting coagulated lumps of suspensions.

 This is achieved by the fact that a thin-layer sump containing a housing with a front wall, in which the lower and upper packages of inclined parallel plates are installed, an input device for the liquid to be cleaned located in the lower part of the housing, a clarified liquid output device, a pickup pocket for collecting the light phase and a drainage unit the precipitate according to the invention has a distribution chamber located under the lower package of plates, a chambered chamber located between the input device and the distribution chamber, and an inlet extended s formed in the front wall of the housing, the bottom of the distribution chamber. The distance between the plates of the upper package is set less than the distance between the plates of the lower package.

 Due to the fact that the thin-layer sedimentation tank has a distribution chamber, an inlet chamber and an extended inlet gap on the front wall of the housing, the turbulent turbulence at the entrance to the distribution chamber is effectively suppressed, as well as the uniform distribution of the treated wastewater before entering the plate package, its laminar movement in the distribution chamber and in between the plates of the package.

 As a result of the fact that the upper package is made with a distance between the plates less than the distance between the plates of the lower package, the settling of finely divided suspended solids is improved, which improves the quality of cleaning.

 The drawing shows a thin-layer sump in section.

 The sump contains a housing 1 with a front wall 2. In the housing 1 there is a lower package 3 of inclined plates 4 and an upper package 5 of inclined plates 6. The distance between the plates 6 is less than the distance between the plates 4. Under the lower package 3 there is a distribution chamber 7. On the outside the front wall 2 is secured with a ditch chamber 8, which communicates with the lower part of the distribution chamber 7 by means of an extended input slit 9 formed in the front wall 2. A device 10 for introducing the liquid to be cleaned is connected to the ditch chamber 8. In the upper part of the housing 1, a light phase ejector 11 is mounted, mounted on the chain 12 with the possibility of moving in a horizontal plane, and a pickup pocket 13 for collecting the light phase, to which the pipe 14 is attached. A sediment discharge unit 15 is attached to the lower part of the housing 1, and the upper part of the housing 1 is connected to a pipe 16 for draining clarified liquid, in front of which a partition 17 is installed.

 The treated wastewater is introduced into the chamber 8 through the input device 10. In the damping chamber 8, the kinematic energy of the stream and wastewater are evenly distributed along its length. From the chambers 8, wastewater in the form of a film stream flows into the distribution chamber 7 through an extended slit 9, which ensures the laminar motion of the liquid.

 In the distribution chamber 7, the wastewater at low speed is mixed with the liquid contained in it and is evenly distributed at the entrance to the lower packet 3 over the entire cross-sectional area. Under pressure of the incoming liquid, the wastewater being cleaned first passes through the gaps between the plates 4 of the lower package 3, and then, changing its direction of movement due to the backward inclination of the plates 6, passes through the gaps between the plates 6 of the upper package 5. In the process of passing through packages 3 and 5 suspended particles settle on the surfaces of the plates 4 and 6. Large heavy and light suspended particles settle on the surfaces of the plates 4 of the lower package 3, rarely located relative to each other, and hard-to-settle weighted hours together with the water to be cleaned, they rise into the upper package 5 and settle on the surfaces of the densely arranged plates 6. Thus, a rough cleaning takes place in the lower package 3, and a fine wastewater treatment in the upper package 5.

 Deposits accumulated on the surfaces of plates 4 and 6 in the form of coagulated lumps slide down without collapsing, pass through the distribution chamber and settle in the lower part of the housing 1, from where they are periodically removed through the sediment removal unit 15. The light phase, which has not settled on the surfaces of the plates 4 and 6, floats to the surface of the liquid filling the housing 1. The light phase ejector 11, moving in a horizontal plane, pushes the light phase into the collection pocket 13, from where it is discharged through the pipe 14. The clarified liquid is drained from the sump through the pipeline 16. The partition 17 prevents the light phase from entering the pipeline 16.

 The proposed thin-walled sump provides high quality wastewater treatment due to the uniform distribution of the treated water before entering the package of plates and eliminating turbulent turbulence at the inlet; use of the stage of fine cleaning in addition to the main one, preventing re-destruction of sedimenting coagulated lumps.

Claims (2)

 1. A thin-layer sump containing a housing with a front wall, in which the lower and upper packages of inclined parallel plates are installed, a device for introducing cleaned liquid and withdrawing clarified liquid, a collecting pocket for collecting a light phase and a sediment removal unit, characterized in that it is equipped with a distribution chamber located under the lower package of plates, an anterior chamber mounted on the outer side of the front wall of the housing and communicating with the distribution chamber by means of an input longitudinal slot made in the front wall in the lower part of the chamber, while the input device of the cleaned liquid is located in the upper part of the chamber.  2. The sump according to claim 1, characterized in that the distance between the plates of the upper package is less than the distance between the plates of the lower package.