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Online cleaning method of desalted water pretreatment device

A pretreatment device and desalination technology, applied in the field of water treatment, can solve the problems of low water production efficiency of the desalination system, and achieve the effect of better cleaning effect, higher water pressure, and thorough cleaning.

Inactive Publication Date: 2019-05-21
马钢(合肥)板材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the pretreatment device of the existing desalinated water system must be shut down for cleaning, resulting in the shutdown of the reverse osmosis device in the subsequent process, resulting in low water production efficiency in the desalinated water system, the present invention provides an online desalinated water pretreatment device. the cleaning method

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  • Online cleaning method of desalted water pretreatment device

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Effect test

Embodiment 1

[0038] This embodiment provides a desalinated water pretreatment device and a pretreatment process flow.

[0039] like figure 1 As shown, the desalinated water pretreatment device includes a first filter unit and a second filter unit connected in series, the first filter unit is provided with a plurality of parallel multimedia filters inside, and the second filter unit is provided with There are multiple activated carbon filters connected in parallel, and the number of multimedia filters inside the first filter unit is equal to the number of activated carbon filters inside the second filter unit. Each activated carbon filter and each multimedia filter are provided with a first water inlet valve, a water outlet valve, a second water inlet valve, an upper discharge valve, a lower discharge valve, an intake valve and an exhaust valve. The first water inlet valve is a raw water inlet control valve, and the second water inlet valve is a backwash water inlet control valve.

[0040...

Embodiment 2

[0045] This embodiment provides an online cleaning method for a desalinated water pretreatment device. The desalinated water pretreatment device in this embodiment adopts the desalted water pretreatment device described in Embodiment 1, and a multimedia filter and an activated carbon are selected. The filter is used as the cleaning object, and the rest of the multi-media filter and activated carbon filter are in normal operation.

[0046] The online cleaning method of the desalinated water pretreatment device comprises the following steps:

[0047] (1) Shutdown drainage:

[0048] Respectively shut down the multi-media filter to be cleaned in the first filter unit, the active carbon filter to be cleaned in the second filter unit, close the first water inlet valve of the multi-media filter to be cleaned and the active carbon filter to be cleaned, open their down-drain valves, which drain the water surface to the sight glass of the filter;

[0049] (2) Clean the first filter un...

Embodiment 3

[0062] This embodiment provides an online cleaning method for a desalinated water pretreatment device. The desalinated water pretreatment device in this embodiment adopts the desalted water pretreatment device described in Embodiment 1, and the first filter unit is provided with two Multi-media filter, there are two activated carbon filters in the second filter unit. During normal operation, there is only one water pump that works normally. One multi-media filter and one activated carbon filter are selected as cleaning objects, and the rest The multi-media filter and activated carbon filter are working properly.

[0063] The online cleaning method of the desalinated water pretreatment device comprises the following steps:

[0064] (1) Shutdown drainage:

[0065] Respectively shut down the multi-media filter to be cleaned in the first filter unit, the active carbon filter to be cleaned in the second filter unit, close the first water inlet valve of the multi-media filter to be...

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Abstract

The invention discloses an online cleaning method of a desalted water pretreatment device and belongs to the field of water treatment. The desalted water pretreatment device comprises first filteringunits and second filtering units, wherein the first filtering units and the second filtering units are sequentially connected in series, and the number of to-be-cleaned filters in the first and secondfiltering units are equal; each to-be-cleaned filter is provided with a first water inlet valve, a water outlet valve, a second water inlet valve, an upper exhaust valve, a lower exhaust valve, an air inlet valve and an exhaust valve. The online cleaning method of the desalted water pretreatment device includes the following steps of stopping running for water discharge; stopping running of the to-be-cleaned filters; cleaning the first filter units, wherein gas backwashing, gas-water mixing backwashing, water backwashing and forward washing are sequentially carried out; cleaning the second filter units, wherein gas backwashing, water-gas mixing backwashing, water backwashing and forward washing are sequentially carried out. In the cleaning process, the pretreatment device runs normally, water is normally discharged, correspondingly running of anti-osmosis devices in the subsequent process cannot be stopped, a desalted water system runs continuously, and the problem that water production of the desalted water system is interrupted cannot occur.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to an online cleaning method for a desalinated water pretreatment device. Background technique [0002] Desalinated water treatment process generally refers to the process of removing weak electrolytes in water, such as carbon dioxide, to a certain extent while removing strong conductive electrolytes in water. It can also be called pure water treatment process or deep desalinated water treatment process. . At present, the more mature desalinated water treatment processes in the market include electrodialysis, ion exchange, reverse osmosis, EDI and so on. [0003] The traditional desalinated water treatment process is mainly a full ion exchange process of pretreatment + cation bed + yin bed + mixed bed. Conventional surface water pretreatment methods are mostly multi-media filtration + activated carbon filtration, and full ion exchange can make the water quality of the ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00
Inventor 王孟琦许月潮李忠东方圆
Owner 马钢(合肥)板材有限责任公司
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