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Process for preparing softening water by alkali wastewater

A technology for softening water and waste water, applied in water softening, descaling, water softening, water/sludge/sewage treatment, etc. It can solve problems such as strong continuity, impact, and complicated process, and achieve the effect of reducing emissions

Inactive Publication Date: 2015-05-13
宁波高新区零零七工业设计有限公司
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Problems solved by technology

[0002] The production process of general alumina production enterprises adopts the mixed method combining "soda ash-lime sintering method" (processing high-silicon bauxite) and "caustic soda-high-pressure dissolution method" (processing low-silicon bauxite). Complex and continuous, each process affects each other

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  • Process for preparing softening water by alkali wastewater

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Embodiment Construction

[0012] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0013] refer to figure 1 , the specific implementation method adopts the following technical scheme: the process of utilizing alkaline waste water to prepare demineralized water, its technological process is: based on the principle of equivalent reaction of waste water alkalinity and new water hardness, new water and waste water are respectively entered into 1# constant position The metering tank I of the water tank, the metering tank II of the 2# constant level water tank, and the coagulant is added to the metering dosing box of the dissolving tank, and the new water and waste water are mixed with new water and waste water in an approved ratio, and then enter The mixed reaction tank is stirred by compressed air, and the residence time is 4.8min. ...

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Abstract

The invention discloses a process for preparing softening water by alkali wastewater, and relates to the technical field of wastewater recycling. The process comprises the following steps: introducing fresh water and wastewater into a metering slot grid I of a 1# constant-level water tank and a metering slot grid II of a 2# constant-level water tank by taking wastewater alkalinity and fresh water hardness equal equivalence reaction as a principle, and adding a coagulant into a metering and dosing tank of a drug dissolving tank; after mixing the fresh water and the wastewater in a rated proportion, introducing the mixed water into a mixing reaction slot, stirring compressed air and staying for 4.8 minutes; introducing the mixed water into a precipitating tank from the lower part through a DN150 tube and staying for 1.6 hours, introducing outlet water from the periphery of the precipitating tank into a filter tank, and introducing filtered softening water into a water absorbing tank of a pump room. The processor can be used for solving the circulating water compensating problem, and effectively reducing the emission of wastewater while recycling the wastewater, so that multiple purposes are achieved.

Description

technical field [0001] The invention relates to the technical field of waste water reuse, in particular to a process for preparing softened water from alkaline waste water. Background technique [0002] The production process of general alumina production enterprises adopts the mixed method combining "soda ash-lime sintering method" (processing high-silicon bauxite) and "caustic soda-high-pressure dissolution method" (processing low-silicon bauxite). Complex and continuous, each process affects each other. Based on these characteristics, it is inevitable that the discharged production wastewater contains alkali. According to statistics, the amount of alkali taken away from the production wastewater accounts for about 60-160kg Na 2 CO 3 / tAl 2 o 3 ) of 10%-12%. "The circulating water of alumina production enterprises accounts for about 80% of the total water. Circulating water is mainly used for cooling equipment and steam condensate. Water must be supplemented after a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/00C02F5/02
Inventor 黄琴
Owner 宁波高新区零零七工业设计有限公司
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