High-hardness domestic drinking water softening device and method

A technology of domestic drinking water and softening device, which is applied in the field of high-hardness drinking water softening device, can solve the problems of appropriate and mature technology for removing hardness of drinking water, achieve good effect of removing hardness, fast response time, and reduce turbidity of effluent water Effect

Inactive Publication Date: 2017-02-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no economically appropriate and technically mature solution for the dehardening technology of domestic drinking water under the mode of urban centralized water supply and small-scale rural water supply

Method used

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  • High-hardness domestic drinking water softening device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Laboratory simulated water distribution, using CaCl 2 2H 2 O (calcium chloride dihydrate) formulated as total hardness (as CaCO 3 (calcium carbonate) based on 330 mg / L of CaCl 2 solution. The alkalinity of the distribution water is extremely low, so sodium carbonate is used as a softening agent. Preparation of sodium carbonate solution: Prepare 1%, 2%, 3%, and 5% sodium carbonate solutions respectively. Before softening, wash the quartz sand with deionized water, and stop when the turbidity of the effluent and the turbidity of the influent are close. Fluidize the quartz sand in the reactor by adjusting the water flow rate. Find that when the water inlet flow is 48 liters / hour, when the fluidization height of quartz sand can reach 115 centimetres, adjust the softening dose of the metering pump 4 so that the softening dose is 2.75 mmol / min sodium carbonate, start timing. Samples are taken from sampling ports 13 at different heights of the liquid-solid fluidized bed ...

Embodiment 2

[0043] Laboratory simulated water distribution total hardness (as CaCO 3 (calcium carbonate) 350 mg / liter, total alkalinity as CaCO 3 (calcium carbonate) 250 mg / L, respectively with CaCl 2 2H 2 O (Calcium Chloride Dihydrate) and NaHCO 3 (sodium bicarbonate) preparation. The softening agent is calcium hydroxide emulsion, and the water intake is 48 liters per hour. Regulate metering pump 4, make its feeding amount be 1.5 mmol / min, 1.8 mmol / min, 2.0 mmol / min, 2.3 mmol / min, 2.5 mmol / min, 2.8 mmol / min, 3.0 mmol / min, 3.2mmol / min in a series of fluidized bed hardness removal experiments. The overall operation is basically the same as in Example 1. The study found that with the increase of the dosage of the softening agent, the turbidity of the effluent gradually increased, and the hardness decreased with the increase of the dosage of the softening agent, and finally stabilized at 120 mg / L. The hardness removal rate reaches 67%, but the turbidity of the effluent after calciu...

Embodiment 3

[0045] Laboratory simulated water distribution total hardness (as CaCO 3 (calcium carbonate) 515 mg / L, magnesium hardness (as CaCO 3 (calcium carbonate)) 70 mg / L, total alkalinity (calculated as CaCO 3 (calcium carbonate) 235 mg / L. The medicine used is sodium hydroxide. The treated water volume is 48 liters / hour, and the corresponding fluidized bed height is 115 cm. Regulate metering pump 4 to control the dosage per minute, 1.88 mmol / min, 2.44 mmol / min, 3.008 mmol / min, 3.76 mmol / min, 4.512 mmol / min, 5.076 mmol / min, 5.64 mmol / min, 6.768mmol / min, carried out a series of fluidized bed dehardening experiments with different dosages. Samples are taken every three minutes until the hardness of the water outlet 11 is stable, and then samples are taken every hour, and then samples are taken from the sampling ports 13 at different heights of the liquid-solid fluidized bed reactor 1 . Sampling and analysis of water hardness, continuous operation for 24 hours. Measure the hardness...

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Abstract

The invention relates to a high-hardness domestic drinking water softening device and method. The high-hardness domestic drinking water softening device is characterized by comprising a liquid-solid fluidized-bed reactor, a water inlet and a chemical inlet are formed in the bottom of the liquid-solid fluidized-bed reactor, the bottom of the liquid-solid fluidized-bed reactor is filled with a crystal inducing material, the top face of the crystal inducing material is higher than the water inlet and the chemical inlet, a water outlet is formed in the top of the liquid-solid fluidized-bed reactor, the water inlet is connected with a water storage device for containing raw material to be softened through a pipeline, the chemical inlet is connected with a tank for containing a softening agent through a pipeline, and pumps are arranged at the position, between the water storage device and the water inlet, of the pipeline and the position, between the tank and the chemical inlet, of the pipeline respectively. The high-hardness domestic drinking water softening device is high in outlet water quality stability, small in sludge output and good in harness removal effect.

Description

technical field [0001] The invention relates to a device and method for softening high-hardness drinking water, belonging to the technical field of water supply treatment. Background technique [0002] Drinking water with high hardness has been criticized and complained by the public because of its poor taste after boiling, easy formation of scale and soap scum, reduced washing effect and skin discomfort. In view of the problem of high water hardness, the existing hard removal processes at home and abroad mainly include chemical softening method, ion exchange method, membrane softening method, etc., but all of them have certain limitations. For example, although the chemical softening method is low in cost, the effluent water quality is unstable, the amount of sludge generated is large, and the management is complicated; the ion exchange softening method not only requires strict pretreatment, but also has high costs, and the salinity of the effluent does not increase. It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F5/08
Inventor 杨晓芳孙闯吴汉军王东升
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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