Field

The invention relates to a system for treating water as defined in the preamble of independent claim 1.

Publication WO 2014/096549 presents a method and an apparatus for treating industrial water. The apparatus comprises an electrocoagulation unit that has a plurality of consumable electrodes. Objective

The object is to provide a system for treating water, which has an improved arrangement for replacing consumable electrodes.

Short description

The system for treating water of the invention is characterized by the definitions of independent claim 1.

Preferred embodiments of the system are defined in the dependent claims.

The water treatment system comprises at least one electrochemical water treatment unit and a maintenance unit. Both said at least one electrochemical water treatment unit and the maintenance unit can have the form and the outer dimensions of a standardized freight container.

In electrochemical water treatment processes, electrode modules, which can comprise electrodes in the form of steel, aluminum or other metal plates, can be used as source of iron and/or aluminum and/or other metals such as copper in electrochemical reactors to precipitate impurities from the treated water stream in combination with electricity. The electrode modules can weight from 100-3000 kg, for which reason direct human maintenance is not possible nor safe, and a hoist is therefore needed to change the electrode modules in the electrochemical reactors. As the electrodes of an electrode module are consumable, it is estimated that an electrode module can last from 2 weeks up to 6 months depending on the effluent water quality and therefore on the required operating parameters.

In the system the hoist is installed inside the maintenance unit that is arranged above of the electrochemical water treatment unit. The hoist can be installed on the inside roof of the maintenance unit on a U-shaped rail structure so that the hoist can lift the electrode modules from the ground level to inside the maintenance unit and transport the electrode modules to the plate pack changing location. The top side of the electrochemical water treatment unit and the bottom structure of the maintenance unit is equipped with an opening through which consumed electrode modules can be lifted from the electrochemical reactor in the first inner space of the electrochemical water treatment unit to the second inner space of the maintenance unit and through which new electrode modules can be lowered from the second inner space of the maintenance unit into the electrochemical reactor in the first inner space of the electrochemical water treatment unit.

An advantage with the presented system is that because the hoist is provided in a second inner space of a maintenance unit and because said at least one electrochemical reactor is arranged in a first inner space of at least one electrochemical water treatment unit, replacement of the electrode modules can safely be done.

With the aid of the maintenance unit there is no need for heavy lifting equipment/machines and the water treatment system can therefore be installed to a remote location where access with heavy equipment/machines is limited due to road conditions etc. Therefore this system expands the usability of water treatment systems and increases the safety of operation.

List of figures

In the following the invention will described in more detail by referring to the figures, which

Figure 1 shows a first embodiment of the system for treating water,

Figure 2 shows the first embodiment of the system that is shown in figure 1 in partly cut state,

Figure 3 shows the first embodiment of the system that is shown in figure 1 in partly cut state,

Figure 4 shows a second embodiment of the system for treating water,

Figure 5 shows the second embodiment of the system that is shown in figure 4 in partly cut state,

Figure 6 shows the second embodiment of the system that is shown in figure 4 in partly cut state,

Figure 7 shows a third embodiment of the system for treating water,

Figure 8 shows the third embodiment of the system that is shown in figure 7 in partly cut state,

Figure 9 shows the third embodiment of the system that is shown in figure 7 in partly cut state,

Figure 10 shows a fourth embodiment of the system for treating water,

Figure 11 shows the fourth embodiment of the system for treating water as cut along line A-A in figure 10,

Figure 12 shows an electrode module according to an embodiment,

Figure 13 shows an electrochemical reactor according to an embodiment, and

Figure 14 shows the electrochemical reactor shown in figure 13 in cut state.

Detailed description of the invention

In the following, the system for treating water and some embodiments and variants of the system will be described in greater detail. The system comprises at least one electrochemical water treatment unit 1 comprising a first self-supporting framework 2 having the outer form of a cuboid and limiting a first inner space 3. The first self-supporting framework 2 comprises preferably, but not necessarily, elongated beams (not marked with a reference numeral) extending at the edges of the first self-supporting framework 2between the corners of the first self-supporting framework 2.

Said at least one electrochemical water treatment unit can have the shape and outer dimensions of a standardized shipping container such as the shape and outer dimensions of a 20, 30, or 40 foot shipping container or such as the shape and outer dimensions of a 20, 30, or 40 foot high cube shipping container.

At least one electrochemical reactor 4 is arranged in the first inner space 3.

Said at least one electrochemical reactor 4 comprises at least one electrode module 5 releasable arranged in said at least one electrochemical reactor 4.

Said at least one electrochemical water treatment unit 1 comprises a top side 6, a bottom side 7, a pair of end sides 8 and a pair of sides 9.

Said at least one electrochemical water treatment unit 1 comprises a first opening 10 in the top side 6.

Said at least one electrochemical reactor 4 is arranged in the first inner space 3 of said at least one electrochemical water treatment unit 1 vertically below the first opening 10 in the top side 6.

The system comprises a maintenance unit 11 comprising a second self-supporting framework 12 having the outer form of a cuboid and limiting a second inner space. The second self-supporting framework 12 comprises preferably, but not necessarily, elongated beams (not marked with a reference numeral) extending at the edges of the second self-supporting framework 12 between the corners of the second self-supporting framework 12.

The maintenance unit 11 can have the shape and outer dimensions of a standardized shipping container such as the shape and outer dimensions of a 20, 30, or 40 foot shipping container or such as the shape and outer dimensions of a 20, 30, or 40 foot high cube shipping container.

The maintenance unit 11 comprises a top side 6, a bottom side 7, a pair of end sides 8 and a pair of sides 9.

The maintenance unit 11 comprises a second opening 13 in the bottom side 7.

The maintenance unit 11 is configured to be arranged above said at least one electrochemical water treatment unit 1 so that the first opening 10 in the top side 6 of said at least one electrochemical water treatment unit 1 and the second opening 13 in the bottom side 7 of the maintenance unit 11 are aligned and so that a section 14 of the maintenance unit 11 is unsupported by said at least one electrochemical water treatment unit 1.

The system comprises a third opening 15 in the bottom side 7 in said section 14 of the maintenance unit 11

A hoist 16 is movable arranged along a rail structure 17 at the top side 6 of the maintenance unit 11 in the second inner space of the maintenance unit 11, so that the hoist 16 is movable to a position above the second opening 13 in the bottom side 7 of the maintenance unit 11 and to a position above the third opening 15 in the bottom side 7 of the maintenance unit 11.

The rail structure 17 can be fastened to the top side 6 of the maintenance unit 11.

The rail structure 17 can be fastened to the second self-supporting framework 12 of the maintenance unit 11.

The rail structure 17 can be configured to move the hoist 16 in a U-shaped path. It is also possible that the rail structure 17 can be configured to move the hoist 16 in a straight path or in a path comprising various shaped sections such as curved and straight sections.

The rail structure 17 can be configured to guide the hoist 16 between a first end 18 of the rail structure 17 that is above the third opening 15 in the bottom side 7 of the maintenance unit 11 and a second end 19 of the rail structure 17 that is above the third opening 15 in the bottom side 7 of the maintenance unit 11 so that the hoist 16 is guided via said position above the second opening 13 in the bottom side 7 of the maintenance unit 11.

Said at least one electrochemical reactor 4 comprises preferably, but not necessarily, a shell structure 20 defining an inner space (not marked with a reference numeral). The shell structure 20 comprises preferably, but not necessarily, an inlet 21 for conducting a water flow into the inner space of the shell structure 20, and preferably, but not necessarily, an outlet 22 for conducting the water flow out of the inner space of the shell structure 20. The inner space of the shell structure 20 comprises preferably, but not necessarily, a reactor chamber 23 between the inlet 21 and the outlet 22, and the electrode module 5 is preferably, but not necessarily, arranged in the reactor chamber 23.

Said at least one electrochemical reactor 4 comprises preferably, but not necessarily, a detachable top lid. The detachable top lid comprises preferably, but not necessarily, lifting portions (not shown in the figures) configured to function together with the hoist 16.

The electrode module 5 comprises preferably, but not necessarily, a plurality of electrode plates 24 arranged in parallel and spaced from one another by means of spacing means 25 and alternately form an anode and a cathode. The electrode module 5 comprises preferably, but not necessarily, a plurality of support members 26 each extending through each electrode plate 24 and at least one spacing means 25 between two adjacent electrode plates 24 for releasable securing said plurality of electrode plates 24 together. Each electrode plate 24 comprises preferably, but not necessarily, a plate portion 27. Each electrode plate 24 comprises preferably, but not necessarily, a supporting and connection lug portion 28 configured to support each electrode plate 24 of the electrode module 5 at one of a first busbar 30 and a second busbar 31 in said at least one electrochemical reactor 4 for electrically connecting each electrode plate 24 of the electrode module 5 with one of the first busbar 30 and the second busbar 31 for supplying electrical current between one of the first busbar 30 and the second busbar 31 and each electrode plate 24 of the electrode module 5. The spacing means 25 are preferably, but not necessarily, made on electrically insulating material. Each electrode plate 24 comprises preferably, but not necessarily, additionally a supporting lug portion 29 configured to support each electrode plate 24 of the electrode module 5 in the electrochemical reactor 4 without electrically connecting the supporting lug 29 portion to one of a first busbar 30 and a second busbar 31 in the electrochemical reactor 4.

The electrode module 5 includes preferably, but not necessarily, lifting portions 32, such as hook portions, configured to cooperate with the hoist 16.

The hoist 16 comprises preferably, but not necessarily, a trolley 33, preferably a motor driven trolley, configured to move along the rail structure 17, and a hook arrangement 34 that is suspended by a chain, a wire or the like from the trolley 33 and that is configured to cooperate with the electrode module 5 of said at least one electrochemical reactor 4.

Said at least one electrochemical water treatment unit 1 comprises preferably, but not necessarily, electrical power means (not shown in the figures) for supplying electrical current to the electrode module 5 of said at least one electrochemical reactor 4.

The maintenance unit 11 can be configured to be stationary arranged above said at least one electrochemical water treatment unit 1. Alternatively, the maintenance unit 11 can be configured to be movable arranged above said at least one electrochemical water treatment unit 1.

The maintenance unit 11 is preferably, but not necessarily, configured to be arranged above said at least one electrochemical water treatment unit 1 so that the maintenance unit 11 is supported on top of said at least one electrochemical water treatment unit 1. Alternatively or additionally, the maintenance unit 11 can be configured to be arranged above said at least one electrochemical water treatment unit 1 so that the maintenance unit 11 is supported on the ground.

The maintenance unit 11 can be configured to be releasable arranged above said at least one electrochemical water treatment unit 1.

At least one of said at least one electrochemical water treatment unit 1 and the maintenance unit 11 can be provided with a roof structure at the top side 6, with a floor structure at the bottom side 7, with an end wall structure at least one of the end sides 8 and/or with a side wall structure at least one of the sides 9.

It is apparent to a person skilled in the art that as technology advanced, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.