Compound agent for reducing hardness of water and removing dissolved organic matter and preparation method of compound agent
A technology of dissolved organic matter and composite agents, which is applied in the fields of water softening, contaminated groundwater/leachate treatment, etc., can solve the problems of biological toxicity and the inability to add drinking water treatment agents, etc. Effect of source water hardness
Active Publication Date: 2018-05-18
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology
In the homogeneous precipitation process of preparing nano-calcium hydroxide, surfactants need to be added. For example, Zhou Jianxin discloses a preparation method of nano-calcium hydroxide, wherein a mixture of polyvinylpyrrolidone and polyethylene glycol is used as a surfactant [Zhou Jianxin. A preparation method of highly dispersed nano calcium hydroxide, application publication number CN105439181A], it is worth noting that polyvinylpyrrolidone and polyethylene glycol are biologically toxic and cannot be added to drinking water treatment agents
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Embodiment 1
[0019] A method for preparing a special compound agent for reducing water hardness and strengthening the removal of dissolved organic matter, comprising the following steps:
[0020] 0.2~0.4mol / L of CaCl 2 Add the aqueous solution into a three-neck flask, insert a polytetrafluoroethylene stirring paddle into the middle of the flask and continue stirring at a stirring speed of 100-150rmp, keep a constant temperature of 25-35°C, and continuously feed nitrogen gas at 30-40mL / min. As a preference, use calcium chloride dihydrate to formulate CaCl 2 The aqueous solution is 0.3mol / L, the stirring speed is 120rmp, the temperature is 30°C, and the flow rate of nitrogen gas is 35mL / min.
[0021] At the same time, drop 0.2-0.4mol / L KOH or NaOH aqueous solution into the three-necked flask at a rate of 25-35mL / h, and the total CaCl 2 Molar ratio to total KOH as CaCl 2 :KOH=1:(1.2~1.4). As preferred, CaCl 2 :KOH molar ratio is 1:1.3, KOH solution and CaCl 2 The molar concentration of ...
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Abstract
The invention discloses a preparation method of a compound agent for reducing hardness of water and removing dissolved organic matter in the technical field of water treatment. Calcium hydroxide is subjected to heterogeneous precipitation on the surfaces of tiny bubbles of nitrogen, nano-scale calcium hydroxide particles are obtained; solid powder of the obtained nano-scale calcium hydroxide particles is mixed with solid powder of PDADMAC (poly (diallyldimethylammonium chloride)), and the compound agent is obtained. Conventional softening agent calcium hydroxide only has the efficacy of reducing the hardness and the problem of high effluent turbidity is not solved all the time. The prepared compound agent can remove most dissolved organic matter on the basis that the hardness removal rateis guarantee, enables the effluent turbidity to be controlled at a lower level and has good application and popularization prospects.
Description
technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a compound agent for reducing water hardness and removing dissolved organic matter and a preparation method thereof. Background technique [0002] The United States Environmental Protection Agency (EPA) defines hardness as the sum of calcium and magnesium ions in water, calculated as the molar mass of calcium carbonate. Highly hard water (greater than 450mg / L) will pose a potential threat to human health, and will form scale on the surface of the heating device, seriously reducing thermal conductivity and increasing energy consumption. European countries such as the Netherlands generally have softening processes in waterworks, and our country is still in its infancy. [0003] my country's water supply situation is severe, and the water sources of waterworks are complex, including surface water and groundwater. Many North China waterworks use surface water mix...
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IPC IPC(8): C02F5/02C02F103/06
CPCC02F5/02C02F2103/06
Inventor 薛强刘菲吴昊澜
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)