FI94654C - Procedure for improving the homogeneity of domestic water - Google Patents

Description

94654

METHOD FOR IMPROVING WATER QUALITY

The invention relates to a method for improving the homogeneity of water, preferably cold domestic or drinking water, in water and coil piping.

The water distribution network is often built and dimensioned larger than what consumption would require. This has been caused by, for example, fire safety regulations. In addition, the piping is dimensioned according to the largest 10 consumption peaks. These together, due to low consumption, cause water to stand in the piping. When consumption is at a minimum, water flows slowly in the piping, resulting in no flow at all in many places.

15 When water stays in the backbone for a long time and only some water intakes are rarely taken, the water does not move throughout the pipeline, which means that the quality of the water is no longer the same throughout the network. In this case, it is commonly referred to as the age of the water, which means how long the water is in the piping before it is consumed. When the water is old, it is possible that when the chlorine added in the water treatment plant has been used up, the quality of the water is no longer hygienically sound. In addition, an increasing amount of sediment may start to accumulate in the walls of the piping when the water flow is low. This leads to clogging of the piping, eg due to the formation of lime or <· - "· rust, or causes corrosion on the surface of the pipe.

Strict quality regulations have been set for the quality of drinking or domestic water, which puts water utilities and water suppliers in an awkward position if the water does not remain of good and • uniform quality. The use of post-disinfection chemicals can increase chemical costs. Excessive use of chemicals can cause side effects, e.g. health hazards. One way to affect the quality of water is to drain water from the pipeline when use is low. In this way, valuable is consumed. of water.

• · v 94654 2 The solution according to the invention provides a significant improvement in these above-mentioned disadvantages. The invention is characterized by what is stated in the characterizing part of claim 1.

5

Advantages of the method of the invention include that the homogeneity of the water improves, the age distribution of the water is most preferably the same throughout the distribution network. Regardless of the point of consumption, the water is of the same quality. Due to the flow of water, 10 water pollution is prevented. Precipitation of sediment in the pipeline, which would cause corrosion and clogging of the pipeline, is prevented. The dosage of post-disinfection chemicals can be significantly reduced because water quality differences have been minimized. To purify the water in the piping, it is not necessary to drain the water outside the piping, so water is saved.

The method according to the invention is described with reference to the accompanying drawing, in which: Figure 1 shows a model example of an area of a distribution network without circulating pumping.

Figure 2 shows a model example of an area of a distribution network in which circulating pumping according to the invention is used.

Figure 3 shows a drawing in which the water flow is observed in 3 dimensions with the values in Table 3 when rotated. topumping was not used.

Figure 4 shows a drawing in which the water flow is illustrated in 3 dimensions with the values in Table 2 when circulating pumping according to the invention has been used.

30

The invention is illustrated by a model example of a distribution network. Figure 1 shows the water supply network of a detached house area, which consists of nodes 2-9, 11-21, 23 and 24 and the wires connecting them 34. The total consumption of the area in the example 35 is 2.17 1 / s, which is thus the amount of node 21 through. The inflow of water into the area takes place through point 21, where, according to the model example, the age of the water is assumed to be zero. According to the model, Table 1 shows a calculation showing the flow times at 4 3 94654 different consumption points without circulating water pumping. Table 1 further shows the water flow times at different consumption points with the circulating pump according to the invention. Circulating pumping is arranged at point 23, where 5 pumps 33 are mounted, from which water is pumped along line 23-24-17-18-19-20. In the calculation example, the line sections 16-17 and 15-19 are closed by means of shut-off valves 31 and 32. It is observed that due to circulating pumping, the age of the water at different consumption points is substantially equalized. Preferably, the circulating pump is located at the point where the water age is greatest without circulating pumping. In order for water to flow throughout the piping, a shut-off valve or a valve must be placed at certain points in the piping to control the flow, as mentioned above, in order to achieve the desired water recirculation. The return pipeline-15 is operated by the existing pipeline, in which case no additional pipeline construction is required.

Em. in the example, the nodes of the piping are assumed to be consumption points. In reality, the wires to the consumption points leave from any wire 34 or node. The node itself may be a consumption point. These wires may have different branches at the end or along which there may be a wear point or points. There is usually no return water supply to the distribution network from these consumption points.

25

The flow of water in the network can be enhanced by the use of a control valve, preferably by valves controlled according to the flow of water. In this way, by controlling the water flows in the different branches of the piping, the variations in the age of the water can be smoothed, which results in a uniform water quality.

Table 2 shows the water lines, the start and end node of the water lines, the length and diameter of the line, and the flow rates vl, which indicates the flow rate without circulating pumping, 35 v2, which indicates the flow rate during circulating pumping. - indicates the direction of flow. According to the calculation model. . the flow velocities v2 have increased significantly in almost all conduction sections, and especially in those sections where there is no flow, the velocity has increased significantly.

Figures 3 and 4 illustrate the changes in velocities without and with circulating pumping. The water flow rates of the piping 5 have increased significantly, which results in the water ages in the different branches of the piping being lower than without circulating pumping. The invention requires the existence or construction of a return line, i.e. wood nets are not directly possible unless the return line is built.

10 Cold water can be recycled inside the property between consumption points. In this case, there are at least two lines for circulating water between the distribution network and the property, or there is a return line to the pump from the consumption points.

15

Table 1 . Table 2

Tin circulating circulating pump to blow Mytöasi

Node Consumption H flow time Flow time2 Cable Time hop Pit. Halit. vl v2 No. <l / a) (m) (HHtMMiSS) (HHsMMiSS) No. alat aim (m) (am) (m / a) (m / a) 2 -0.010 SO.937 19 * 51 * 37 7 * 36 * 36 5 21 20 80.00 150.00 0.12 0.12 3 -0.018 50.937 8:30 <10 7 * 31 * 0 6 19 18 110.00 125.00 0.02 -0.37 8 -0.082 50.939 6 * 20 * 53 7i 7 * 12 7 19 20 382.00 125.00 - 0.08 0.38 2U 5 -0.838 50.937 10 * 58 * 4 7 * 7 * 22 8 20 11 203.00 125.00 0.04 0.18 6 -0.035 50.939 6 * 2 * 10 5 * 32 * 21 9 20 12 128.00 150.00 0.06 0.25 7 -0.181 50.939 4 * 15 * 11 6 * 28 * 12 10 19 15 105.00 200.00 0.01 aulj.

8 -0.125 50.988 2 * 17 * 24 6 * 7 * 6 11 18 17 108.00 125.00 0.01 -0.38 9 -0.038 50.951 2 * 7 * 56 6 * 7 * 13 12 17 16 85.00 150.00 -0.02 aulj.

11 -0.238 50.956 1 * 55 * 22 6 * 4 * 38 13 15 16 44.00 150.00 0.03 0.12 12 -0.050 50.950 0 * 46 * 49 5 * 45 * 27 18 15 18 92.00 200.00 -0.01 -0.07 13 -0.035 50.951 0 * 55 * 39 5 * 87 * 18 15 18 13 198.00 125.00 -0.03 -0.16 18 -0.177 SO.988 5: 26 * 32 6 * 38 * 50 16 12 13 35.00 125.00 0.07 0.32 15 -0.039 50.988 7: 28 * 8 7 * 0 * 58 17 12 11 133.00 125.00 0.02 0.08 16 -0.037 50.982 7 * 51 * 22 '7 * 6 * S8 - 18 11 9 30.00 125.00 0.08 0.19 17 -0.307 50.980 9 * 8 * 58 7 * 88 * 7 20 8 9 101.00 125.00 -0.08 -0.19 18 -0.183 50.987 8 * 17 * 12 7 * 52 * 82 21 13 8 76.00 125.00 0.03 0.15 19 -0.031 50.980 2 * 80 * 89 7 * 57 * 43 22 14 7 130.00 200.00 0.00 -0.01 ; . 20 -0.068 50.967 0 * 10 * 52 S> 36> 53 23 16 5 125.00 150.00 0.01 0.12 21 2.167 51.000 0 * 0 * 0 0 * 0 * 0 28 17 28 116.00 125.00 0.00 -0.80 23 0.000 50.937 21 * 36 * 35 7 * 38 * 52 2S 7 8 190.00 150.00 -0.03 -0.15 28 -0.170 50.937 21: 89 * 36 7 * 83 * 19 26 7 6 30.00 150.00 0.01 0.12 27 5 6 107.00 125.00 -0.02 -0.13 28 5 2 263.00 125.00 0.00 0.17 30 2 23 57.00 125.00 0.01 0.82 31 3 2 117.00 125.00 0.01 0.25 32 5 3 163.00 150.00 -0.01 0.07 33 3 8 120.00 125.00 -0.02 -0.15 38 6 8 180.00 150.00 0.00 0.03 35 8 8 287.00 125.00 0.02 0.11 36 23 28 77.00 150.00 0.01 0.29

II

Claims (8)

A method for improving the homogeneity of the domestic water, in which the method enters the water into the pipeline, which contains several water sources (consumption points), the pipelines nodes (2-9, 11-21, 23 and 24) between which there is a water pipe (34 ) along which the water is measured from the feed pipe to the places where the water is consumed, characterized in that the water is forcibly circulated in the water line by means of an apparatus (33) installed in the water line which causes the water circulation to achieve the water's homogeneity. A method according to claim 1, characterized in that the water is circulated by means of at least one pump (33), which is presumably located in a place where the water flow is at least according to information fed without pumping. A method according to claim 2, characterized in that at least branching when the pump (33) is closed by a valve, advantageously with a shut-off valve (31, 32) for controlling the water flow. A method according to claim 3, characterized in that the valve (31, 32) is adjustable. <· C A method according to claim 1, characterized in that the water flow is controlled by at least one valve located in the pipeline which regulates according to the water flow. 30 6. A method according to any preceding claim, characterized in that the water is circulated by at least one pump (33) and the current is controlled by at least one valve (31, 32). Process according to any of the preceding claims, characterized in that the water flow is circulated by at least one pump (33) and that the flow is regulated at least by a valve which presumably regulates according to the flow, and / or a valve (31, 94654). Method according to any of the preceding claims, characterized in that the water is circulated independently of the consumption. • · • <li