SE517235C2 - Effluent purification process, comprises pumping mixture of flocking agent and sedimentation step effluent up through collection pipe system - Google Patents

Abstract

Purifying effluent, by supplying effluent from the sedimentation system and a flocking agent to the flocking station and the resulting mixture is pumped into a first sloping collection pipe (3) and transported vertically into a second sloping collection pipe (4), is new. Flocking continued until the desired level of purity is recorded by a turbidity sensor (14) located upstream from a purified water outlet (13). Purifying effluent in order to remove contaminants and/or residual products, where the effluent comprises a shot peening process effluent, a cutting or coolant fluid, stearate-containing water from the yarn drawing industry, an emulsion or an oil/water mixture, uses a tubular flocking station (2) connected to a standard sedimentation system (1), is new. A combination of a flocking agent or precipitating agent and heat are used to carry out flocking. A pre-selected turbidity level is continuously monitored in the clear water leaving the flocking station. Effluent from the sedimentation system is used to fill up the flocking station, whilst at the same time this effluent is dosed with flocking agent. The resulting mixture is pumped into a first sloping collection pipe and transported upwards via at least one substantially vertical connecting pipe (6) into a second sloping collection pipe. Flocking is allowed to continue for a given length of time until the desired level of purity is recorded by a turbidity sensor located upstream from a purified water outlet. Fresh effluent is then pumped into the system at the same time as purified water is forced out. An Independent claim is also included for the process apparatus.

Description

, 17 235 n cess water is purified with the help of suitable flocculants and precipitants, whereby small metal industries with residual products no longer have to risk straining lakes and treatment plants and by separating the residual products at an early stage, this also entails large energy gains that are otherwise needed. destruction and transport. The device according to the invention consists of a pipe system where clear water is separated from the residual waste by means of flocculants, whereby the flocculation process itself. starts manually or automatically when a preset purification level has been reached. The device according to the invention is advantageously used together with an ordinary sedimentation plant and from this process water is sucked up. The flocculant used is biodegradable and the device for purifying the process water from sedimentation systems can be considered as a “bypass system”.

The invention is described in more detail below with the aid of a preferred embodiment with reference to the accompanying drawing, which shows a schematic representation of a device according to the invention for purification of prOCeSSWater connected to a sedimentation system.

As can be seen from the schematic drawing, a preferred embodiment of a flocking part according to the invention connected to a closed, primitive sedimentation system 1 coupled to an equalization tank is shown here. with filter and circulation pump.

The device according to the invention consists of a tubular flocculation part which consists of a pipe system for separation of residual waste and recycling of the purified process water. It acts as a purifying "bypass system" on the side of sedimentation system.

Normally, process water circulates during tumbling in the sedimentation system. The residual products that are carried with the water and coarsely sediment in. Floor cleaning drawers. The level i. These boxes are kept constant by means of level switches which start a circulation pump v.

AW m son1 pumps up the process water to an 'equalization tank'. After filtration, the process water is carried further down to the drums and eats to the sedimentation boxes.

In the so-called cycle according to the invention, chemical substances such as flocculants or precipitants are mixed "bypass" in combination with heating into the process water. After a clarification phase, the separated clean water returns to the first cycle in the sedimentation system. Manually or with a special electronic sensor in the form a detector drains the hazardous waste into special containers for disposal and evaporation.The energy used in the evaporation can be utilized from otherwise vented excess heat.The water can of course also be centrifuged away to accelerate the dry matter process.

In the pipe system forming a flocculation part 2 according to the present invention, clear water is separated from residual waste by means of flocculants. The waste can be discharged through three outlets, namely 5, 7 and 10 if necessary, i.e. when a sufficient amount of waste has been collected above the respective outlet and the purified so-called the clear water is taken out through an upper outlet 13. The flocculation part. 2 comprises a first, oblique collecting pipe 3 with an upper inlet 21 for process water with mixed flocculant, which is sucked up by means of a pump 16 via lines 24, 25 from a floor well box 22 present in the sedimentation system 1. The pipe 3 has an outlet 5 in its lower part. vertical part 8 for collecting and draining contaminants in the form of sink residues. A second inclined collecting pipe 4 is connected to the oblique portion of the first pipe 3 via at least one substantially vertically extending pipe 6 and which comprises an outlet 7 in its upper, vertical part 9 for collecting and draining liquid residues and an outlet 10 in its lower, vertical part ll for collecting and draining the remaining sink residues. The inclination of the respective collecting pipe 3,4 is preferably about 45 °. An outgoing pipe 12 with an outlet 13 v 517 235 for clear water is connected to the pipe 4 in an area just above the outlet 10 in the lower, vertical part 11. In the outgoing pipe 12 there is in a vertical portion 19 before the outlet 13 a detector 14 for sensing the current cloud level.

The flocculation process is started manually or automatically when a preset purification level has been reached or a preset turbidity level has been exceeded. The detector 14 senses the turbidity or clarity of the outgoing clear water in the outlet 13. If the water is sufficiently clear, i.e. has had time to be purified, the detector 14 allows the pump (s) 16 and 17 used to be started.

At start-up, both the dosing pump 17 and the process water pump 16 start and the latter sucks up process water from a floor well drawer 22 present in sedimentation system 1 while the dosing pump 17 sucks up flocculant from a flocculant container 18, which is dosed into the pump housing 20 of the pump.

The contaminated process water and the flocculant mix in the pump housing 20 and are passed via a line 25 through an inlet 21 further through a pipe inside the lower collecting pipe 3 down into the vertical part 8 of the pipe 3, whereby the pipe system is filled.

The process water rises in the collecting pipe 3 and through at least one substantially vertically extending pipe 6 and up to the second inclined collecting pipe 4. From this pipe the process water rises further through an outgoing pipe 12 via the detector 14 to the outlet 13 for clear water.

The main discharge of the flocculated residues takes place through the outlet 5 in the first, oblique collection pipe 3 and the liquid waste residues end up in the upper, oblique pipe 4 floating residue discharge through the outlet 7. The process water rises in the pipes until the detector 14 senses the "difficulty" in the polluted water. pumps 16 and 17 stop and the flocculation and separation of the sinking and liquid residues starts. The time for the purification and flocculation process is from about _, 5.1 7_ 2 35 - 0 to 12 hours depending on the degree of contamination, the degree of contamination, the flow, the amount of dosage and the desired degree of purity. When the detector 14 has re-approved the clarity of the clean water, the pumps 16 and 17 start again, whereby new, incoming, polluted water or process water pushes out the clear water or clean water to the large sedimentation system with the circulating tumble water.

Inside the width of the upper, sloping collecting pipe 4, the flow contaminants are concentrated with a surface-limiting lip and these are helped over the edge, ie pushed with air down to the outlet 7. The liquid waste residues are separated from the clean water in the upper part of the pipe 4 by compressed air. lower, oblique portion 15. The flocculation tubes or pipes and the reindeer water outlet pipes are advantageously transparent in order to be able to monitor the quality of the flocculation process visually.

Claims (7)

nano: (5,1 j 235 - - Ilšf Patentkrav Methods for purifying process water for the recovery of impurities and / or residues from tumbling processes, cutting and cooling fluids, from the wire drawing industry stearate-mixed water and emulsions or oil-mixed water, in connection with or without an ordinary sedimentation system (1) by means of a tubular flocculation part ( 2), characterized in that in the flocculation part (2) the process water is separated from residual waste by means of chemical substances such as flocculants or precipitants in combination. with. heating, at the same time as a preset cloud level is continuously sensed in clear water emanating from the flocculation part, whereby during a first moment the flocculation-forming system is filled with process water from the sedimentation system (1) at the same time as the process water is dosed with flocculant and a mixture takes place and the medium in question pumped into a first, oblique collecting tube (3), from which the medium continues upwards to a second, oblique collecting tube (4), to which the medium is fed through at least one substantially vertically extending tube (6), after which during a second step a flocculation process is started to last for a predetermined time, until the desired degree of purity is registered by a cloud level sensing detector (14), located before an outlet (13) for the clean water, when process water is again pumped into the system at the same time as it squeezes out the clear water. 2. A method according to claim 1, characterized in that the first, inclined collecting pipe (3) separates the flocculated contaminants in the form of sink residues, which are drained through an outlet (5) in the lower part (8) of the pipe (3) and subsequent at the same time as the second, inclined collecting pipe (4) catches the floating waste residues and separates them from the clean water with its own buoyancy and by means of compressed air, which is introduced into the lower, oblique portion (15) of the pipe (4), which waste residues are drained through an outlet (7) in the upper part (9) of the collection pipe; 5, 7 m d at the same time as sinking waste residues are drained through an outlet (10) in the lower part (11) of the pipe (4). A method according to claim 1, characterized in that a pump (16) pumps the process water to the flocculation part (2) from a floor well drawer (22) in the sedimentation system (1) at the same time as a dosing pump (17) sucks up flocculant from a flocculant container ( 18), which agent is mixed with the process water in the pump housing (20) of the pump (16) before or in connection with the filling of the pipe system forming the flocculation part (2). 4. Process for purifying process water for the recovery of contaminants and / or residues from tumbling processes, cutting and cooling fluids, stearate-mixed water from the wire drawing industry and emulsion or oil-mixed water, in connection with or without an ordinary sediment system (1) by means of a tubular flocculation part (2), characterized in that the flocculation part (2) consists of a pipe system, in which clear water is separated from the process water by means of chemical substances such as flocculants or precipitants in combination with heating and which comprises a first oblique collecting pipe (3) with an upper inlet (21) for process water with mixed flocculant, which is sucked up by means of a pump (16) via pipes (24, 25) from a floor manhole (22) present in the sedimentation system (1) and which pipe (3) has a lower outlet (5) for draining contaminants in the form of sink residues, a second inclined collecting pipe (4) which is connected to the oblique portion of the first tube (3) via at least one substantially vertically extending tube (6) and which comprises an outlet (7) in its upper part (9) for draining liquid residues and an outlet (10) in its lower part (11 ) for draining sink residues and a pipe (12) extending in the area just above the outlet (10) i. the lower part (11) with an outlet (13) for clear water, before which outlet (13) a turbidity level sensing detector (14) is arranged. u | ø o f: s1v_2ss_ š * ëa »ääà, fi}? ** Device according to claim 4, characterized. in connection with the pump (16) there is a dosing pump (17) for feeding the chemical substances from a container (18) via a line (23) to a pump housing (20) on the pump (16). Device according to Claim 4, characterized in that the outlets (5, 7, 10) for residual products from the process water open from the respective lower and upper collecting pipes (3,4) into vertical portions thereof. Device according to claim 4, characterized in that the inclination of the respective collecting pipe (3; 4) is preferably 45 °.