SU952761A1 - Apparatus for biochemical purification of effluents - Google Patents

Description

The device is intended for biochemical wastewater treatment, surfactants prone to abundant foaming, for example, wastewater, pulp and paper industry.

A device for biochemical water treatment is known, having a sealed chamber with an aeration unit and a defoaming system located directly in the G1 aeration zone.

A device for biochemical wastewater treatment is known, comprising a housing, a divided partition, a naked clarification chamber and an aeration chamber with overlapping and a foam quenching system located in the aeration zone T2

A disadvantage of the known solutions is that the foam quenching occurs directly in the aeration zone (reaction), which increases the moisture of the foam due to the possibility of using only dampers of hydroelectric effect.

 In addition, in the known devices is not provided for the removal of foam and condensate from the reaction zone.

All of these drawbacks reduce the performance of the aerotank and impede its operation.

The aim of the invention is to improve the performance of the device when treating wastewater prone to abundant foaming.

The goal is achieved by the fact that the device has a KC1mer collection

10 foam placed in the upper part of the device, in the walls of which there are holes with a throttle valve, and a condensate collector with an air release system.

15

At the same time, the foam quenching system is located inside the foam collection chamber.

FIG. 1 shows a device for biochemical wastewater treatment, top view; in fig. 2 - section

20A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

, The proposed device has a housing 1 with installed stretch-inclined partitions 2,

Claims (2)

25 separating the housing 1 into the aeration chambers 3 and the lightening chamber 4. Aeration chambers have overlap 5, made of foam-tight materials, such as polymeric materials, reinforced concrete, or wood. Overlap 5 is located above each aeration chamber 3 parallel to the mirror in the aeration tank and, together with partitions 2, forms an individual foam collector 6 above each aeration zone 3. The boundary between the aeration zone 3 and the collector 6 is a mirror of water in the aeration tank. The individual foam collector 6 communicates with the foam collection chamber 7 through the holes 8 made in the recesses of the chamber 7. The holes 8 are equipped with throttle valves 9. Inside the foam collection chamber 7 is perpendicular The foam flow system is installed 10 foam quenching. The device has a collection of 11 condensate with a system of 12 air release into the atmosphere. Below camera 7 is a technical corridor 13 for servicing the aero tank. It has air ducts, fittings, etc., including a condensate transfer pump. The foam quenching system 10 can be designed as a centrifugal foam-diluent, in the form of douche nozzles of various designs, placed evenly over the entire cross-section of the collector in three-four planes. Placing the nozzles perpendicular to the flow of foam in the collector, compared with the traditional parallel placement, reduces the number of air nozzles by about as many times as the cross-section of the chamber 7 is smaller than the total area of the aerated chambers 3. This allows an increased flow rate of one nozzle with an unconditional reduction in total liquid or reagent consumption for defoaming as a whole. As a result, it becomes possible to increase the diameter of the spray port of the nozzle and eliminate its clogging with coarse dispersed substances. A device for the biochemical treatment of wastewater works as follows. The Christmas waters entering the purification pass successively the aeration chamber 3 (biological purification) and the illuminating chamber 4. In biochemical purification of wastewater containing surfactants, intensive foaming occurs ... As the foam accumulates, it fills the entire volume of the individual collector 6 foam. As a result of continuous aeration, a continuous foam formation and accumulation process takes place. As a consequence, the foam begins to self-compact and is extruded through a single exit from the collector b through the opening 8 into the common foam collection chamber 7, where the process of accumulation, self-sealing and extrusion of foam is repeated towards the foam-absorbing system 10, where destruction takes place. Condensed foam accumulates in condensate collector 11, from where it is pumped out by pump 14 for recycling. Condensate is disposed of either by biological oxidation in the aeration tank or outside the aeration tank, for example, in evaporation plants or regeneration furnaces of pulp mills. The separated air through exhaust 12 is removed to the atmosphere. Poi chemical destruction of foam excess reagents involved in the process again. For this, pump 14 operates as a circulation pump, feeding the mixture of reagents and condensate from collector 11 to condenser 10. Excess condensate from collector 11 is sent for recycling using one of the methods described. Aerating air contributes to the foam transportation process. However, the practice of operating wastewater treatment plants in the pulp and paper industry confirms the high self-transporting capacity of foam in confined spaces and without accompanying air flow. The proposed aerotank clarifier ensures the continuous operation of the aerotank due to the transportation of foam without any mechanical devices and ensures the stability of the quality of the treated wastewater. At the same time, the consumption of liquid or reagents for defoaming is reduced, reuse of these agents, etc. is ensured. The proposed device makes it possible to increase the aeration rate and to maintain the calculated aerotank performance when working with wastewater containing surfactants. In addition, the device allows you to adjust the foam's moisture content and, consequently, reduce capital and energy costs for its utilization and quenching. Claim 1. Device for biochemical wastewater treatment, including a housing divided by partitions into a clarification chamber and aeration chamber with overlapping and foam quenching system, characterized in that, in order to increase the productivity of the device during wastewater treatment, prone to abundant pricing, it has a foam collection chamber located in the upper part of the device, in the walls of which there are holes provided with a throttle valve, and Condensate collector with air exhaust system. 2. The device according to claim 1. About the liter is that the foam quenching system is located inside the foam collection chamber. Sources of information taken into account in the examination 1. US patent 3563858, cl. 195-107, 1971. 2. US patent number 3669600, cl. 252-361, 1971. Inlet stock