RU2591941C1 - Device for purifying waste water - Google Patents

Abstract

FIELD: treatment plant.

SUBSTANCE: invention relates to membrane engineering and can be used for purification of waste water by reverse osmosis. Proposed device comprises reverse osmosis device, vessel-balancing tank purified water, pump, magnetic valves, shutoff valves, expansion tank, mesh filter, reverse osmosis device of first stage settler reverse osmosis, concentrate storage container with submersible pump, reverse osmosis device of second stage, reverse osmosis membrane roll type with an open channel in which there is no turbulizing grid, and reverse osmosis device of second stage is made with possibility of circulation in it concentrate.

EFFECT: technical result is cleaning waste water without afterpurification to filtrate outlet (pure water) up to 99 % of initial, absence of reactant treatment of water, automated operation without constant maintenance personnel.

1 cl, 1 dwg

Description

The invention relates to membrane technology and can be used in wastewater treatment by reverse osmosis without preliminary wastewater treatment, without the use of various reagents (inhibitors) and filtering, sorption feed materials, such as activated carbon, expanded clay, sand, etc. by using filtering through reverse osmosis membranes with an "open channel"

The level of technology.

A METHOD FOR BIOLOGICAL CLEANING OF ECONOMIC-FEKAL WASTE WATERS WITH DIRECTLY CHANGING DURING COSTS AND COMPOSITIONS, which includes filtering the water, settling, averaging its flow, treatment of wastewater with water treatment plants from bacteria to sewage treatment. At the stage of the bioreactor of a multi-force wastewater treatment system, air is supplied according to a program preliminarily compiled on the basis of these indicator values: dissolved oxygen content, suspended matter, pH, Eh, oxidizability and nitrogen and ammonium nitrogen content updated daily [RU 2497762 C2, C02F 9/14 , C02F 3/30, C02F 3/34, 11/10/2013].

The disadvantage of this analogue is: the large time spent on cleaning, pre-treatment of wastewater for treatment and the subsequent disinfection of the resulting water.

The closest analogue is a DEVICE FOR WATER CLEANING FOR MEDICAL PURPOSES BY THE REVERSE OSMOSIS method, which includes a node with a reverse osmosis membrane and a storage tank, a container with a chemical agent, a valve mode switch, the first, second, third and fourth highways. At the same time, the input of the unit with the reverse osmosis membrane is connected to the first line for supplying pre-prepared water, which contains the first solenoid valve and the high-pressure pump in series. The first output of the node with the reverse osmosis membrane is connected to the water discharge line. The second output of the node with a reverse osmosis membrane is connected to the drive by a second highway, in which a second electromagnetic valve is installed. The device also includes a third line, which connects the drive output to the first line in front of the high pressure pump. At the same time, a third solenoid valve is installed in the third line. The device contains a container with a chemical reagent. The output of the chemical tank is connected to the first line in front of the high pressure pump by the fourth line. In this case, the device is equipped with a mode switch made of three ball valves with a common handle, the first ball valve installed in the first line, the second ball valve installed in the second line and the third ball valve installed in the fourth line [RU 131713 U1, IPC C02F 1 / 44 (2006.01), B01D 61/12 (2006.01), 08.28.2013].

The disadvantage of the closest analogue is that the first line is supplied with pre-prepared, that is, clarified, dechlorinated, iron-free and softened water.

The required technical result consists in: wastewater treatment (stormwater, industrial, recycling, domestic) directly, without purification with the possibility of filtrate output (clean water) up to 99% of the original, as well as in the absence of reagent water treatment and in automated work without permanent staff.

The required technical result is achieved: by using filtering through reverse osmosis membranes with an “open channel”, regular hydraulic flushing, using magnetic valves and constantly reducing the volume of concentrate (dirty water that does not pass through the membranes) by two-stage cleaning, in which the second stage is used only for circulation of concentrate in it.

Reverse osmosis membranes with an “open channel” are roll-type membranes in which there is no turbulent mesh and the channel is “open”, due to which the same hydraulic conditions are maintained as in the tubular channel. Changing the design of the membrane channel allows you to eliminate the causes of the nucleation of sediment crystals and offer new technologies for water purification with the utilization of concentrate and reducing consumption for own needs. Removing the turbulent mesh and reducing the resistance allows the membranes to maintain a high-speed regime, which ensures separation of particles from the membrane surface and prevents sedimentation.

Removing the mesh from the channel also solves the problem of eliminating the causes of the formation of stagnant zones in which the nucleation of crystals of poorly soluble salts begins, which subsequently leads to the formation on the membrane surface of entire regions covered with crystalline deposits. As is known, solutions of calcium carbonate and calcium sulfate have a fairly high stability, i.e. do not show a tendency to opalescence and sedimentation at sufficiently high values of the degree of supersaturation for these compounds. Therefore, the absence of stagnant zones and the minimum values of the concentration polarization level make it possible to maximize the filtrate yield and increase the concentration rate of the source water in membrane installations without the risk of precipitation of poorly soluble salts on the membranes.

Figure 1 presents a diagram of a device for wastewater treatment.

A wastewater treatment device contains: an expansion tank 1, a strainer 2, a pump 3, reverse osmosis of the first stage 4, a reverse osmosis sump 5, a storage tank of concentrate 6, averaging tank 7, a submersible pump 8, reverse osmosis of the second stage 9, magnetic valves 10 (1) and 10 (2), shutoff valves 11.

A wastewater treatment device operates as follows: the source wastewater is fed to the beginning of the system through an expansion tank 1 into a strainer 2, then with a pump 3, water is supplied to the first stage of reverse osmosis 4, the magnetic valve 10 (1) opens at predetermined intervals, thereby thereby providing hydraulic flushing of reverse osmosis 4, after the first stage, the source water is divided into two streams - the filtrate (purified water) and concentrate (concentrated pollution), after which the filtrate of the first stage is sent to it the averaging bone 7, and the concentrate of the first stage enters the reverse osmosis sump 5, from which, when the maximum volume is reached, it is poured into the storage tank 6, then from the storage tank 6 using the submersible pump 8, water is supplied to the second stage of reverse osmosis 9, where it is divided according to the principle the first stage 4 to the filtrate and concentrate, then the filtrate is also fed into the tank 7, and the concentrate into the tank 5, thereby constantly reducing the volume of the concentrate, the magnetic valve 10 (2) opens at predetermined intervals, thereby m providing hydraulic flushing the reverse osmosis 9 and valves 11 enables the replacement of individual elements of the system.

Thus, thanks to the proposed device, the required technical result is achieved, which consists in the treatment of wastewater (stormwater, industrial, circulating, domestic) directly, without purification with the possibility of filtrate (clean water) output up to 99% of the original, as well as in the absence of reagent water treatment and in automated work without a permanent staff.

Claims (1)

A device for wastewater treatment, containing a reverse osmosis device, a tank - a purified water averager, a pump, solenoid valves, shutoff valves, characterized in that it further comprises an expansion tank, a strainer, a first stage reverse osmosis device, a reverse osmosis settler, a concentrate storage tank with a submersible pump, a reverse osmosis device of the second stage, using reverse osmosis membranes of a roll type with an open channel in which there is no turbulent mesh a, and the reverse osmosis device of the second stage is configured to circulate concentrate in it.

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