SU1346188A1 - Apparatus for purifying waste water - Google Patents

Abstract

The invention relates to the treatment of industrial wastewater and provides a stable cleaning of petroleum products and weighted matter. The purpose of the invention is to intensify the cleaning process. The wastewater treatment apparatus comprises a housing divided by partitions into mixing, coagulation, flocculation chambers, with a layer of suspended sediment and settling. Packing plates are installed between the chambers to ensure that the dispersed sludge and floating substances are not taken as well as that part of the sludge is returned to the coagulation and flocculation chambers to accelerate the sorption process and to save reagents. The ratio of the volumes of the mixing, coagulation, suspended sediment and settling chambers is 0.05-0.08; 0.2-0.3; 0.05-0.1; 0.4-0.6. 1 il. "(/) Koazy / fflHm C / TJOVf / cfi 7/2 7 2 CO O 00 00 Purified 10 ood 5

Description

The invention relates to the field of industrial wastewater treatment and is intended for use in wastewater treatment plants of the petrochemical, chemical, oil refining, metallurgical and other industries.

The purpose of the invention is to intensify the cleaning process, improve coagulation, flocculation, sedimentation and filtration in the suspended layer by means of multiple gravity recirculation of sludge, a countercurrent sewage supply system and recycled sludge, an increase in the capacitive efficiency of the facilities and a decrease in metal consumption.

The drawing shows the proposed device, a longitudinal section.

The device contains feed pipe 1, displacement chambers 2, coagulation 3, flocculation 4, with a layer of suspended sediment 5, settling 6, filtering in suspended layer 7, a system 8 of dispersed surface selection of clarified water, mixing devices 9, packages of collecting plates 10, pipeline 11 for discharging purified water, pipeline 12 for discharging superfluous substances, a scraper mechanism 13, sludge extractor 14, pipeline 15 for discharging sludge.

Packages of the precipitation plates 10 are installed between the chambers 3-7 at the outlet of each chamber.

In the chamber 5 with a layer of precipitated sediment, plates of the precipitation plates are also installed at the entrance to it.

It is advisable to perform the volumes of the chambers in the ratio: displacement of 0.05-0.08, coagulation of 0.2-0.3, with a layer of suspended sediment 0.05-0.1, settling 0.4-0.6,

The device works as follows.

Sewage water and coagulum flow through conduit 1 into mixing chamber 2 and further into coagulation chamber 3 and flocculation 4. Flocculating fluid is introduced before flocculation chamber 4. Mixing devices 9 rotate towards the incoming waste water. When the sewage moves from the bottom up, the equalization of velocities takes place and conditions are created for optimal flocculation. The wastewater from the coagulation chamber enters the flocculation chamber and then into the settling chamber through inclined settling plates 10, which allows part of the sediment to be returned to the coagulation and flocculation chambers.

The specified precipitate promotes the acceleration of sorption. The driving force of the sorption process increases under the conditions of the countercurrent movement of the contaminants of the waste water and the return sludge.

In the coagulation and flocculation chambers, a high concentration of flakes is created, which speeds up the process of adhesion of solids. In countercurrent conditions provide

It saves reagents by 20-30%, the effect of removing contaminants, including dissolved ones, is increased by 30%.

Water entering the settling chamber

It passes through chamber 5 with a layer of sediment formed by precipitation plates 10 mounted with an inclination in the opposite direction. The suspended sediment layer is formed mainly of the same size particles, continuously coming from the precipitation plates in the bottom of the sediment. The countercurrent movement of the treated water and precipitate contributes to the adhesion of small particles transported by the liquid to larger flakes of sediment, which speeds up the precipitation process and provides at this stage the release of 60-70% solids. Due to the absence of convective currents of fluid movement in the suspended layer, the possibility of flow turbulization is excluded. Under laminar flow conditions, the precipitated sediment layer works stably.

The laminar settling chamber 6 is equipped with a scraper mechanism 13, transporting the precipitated sediment in at 14.

At the exit of the device, inclined precipitation plates 10 are formed, forming a filtering chamber 7 in a raised bed, ensuring the removal of a finely dispersed suspension. The precipitate coming from the plates is collected in flask 14, from which it is removed by conduit 15.

Floating substances are removed through conduit 12 for discharging superfluous substances.

The use of the proposed device provides a stable treatment of waste water from petroleum products and suspended solids with the efficiency of soil removal up to 80%.

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Claims (1)

Invention Formula A wastewater treatment device comprising a horizontal rectangular housing placed in the housing of the displacement, coagulation, flocculation and sedimentation chamber, displacement devices, sludge removal systems and clarified water, in order to intensify the cleaning process by improve coagulation, flocculation, sedimentation and multiple gravity recirculation of sediment; it is equipped with a chamber with a layer of suspended sediment located in front of the sedimentation chamber, sets of precipitation plates the cameras at the exit of each chamber, with the ratio 5 volumes of mixing, coagulation chambers with a layer of suspended sediment and settling are (0.05-0.08) - (0.02-0.3) - (0.05-0.1) - (0.4 -0.6).