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Recycling process of garbage fly ash ash-washing water

A garbage fly ash and ash washing technology, which is applied in the direction of water pollutants, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the problems of environmental pollution and high energy consumption of the process, so as to reduce the cost of comprehensive treatment and improve The effect of resource utilization

Active Publication Date: 2011-04-20
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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Problems solved by technology

[0004] The purpose of the present invention is to provide a process for recycling waste fly ash washing water to solve the problems of high energy consumption and environmental pollution in traditional processes

Method used

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  • Recycling process of garbage fly ash ash-washing water
  • Recycling process of garbage fly ash ash-washing water

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Embodiment Construction

[0019] The present invention is described in detail below in conjunction with accompanying drawing:

[0020] Realize the specific embodiment of the recycling process of a kind of garbage fly ash washing water of the present invention is to carry out suspended solids separation, remove heavy metal ions, remove calcium and magnesium ions, filter, mechanical compression and multi-effect evaporation steps (see figure 1 ):

[0021] Separation of suspended solids: Garbage fly ash washing water enters the 1# sedimentation tank [1] to settle for 4.5 hours, the clarified liquid in the upper layer enters the 1# reaction tank [2] for treatment, and the sewage containing more suspended solids in the lower layer passes through 1 #After the dehydration of the centrifuge [3], the filtrate is collected by the sump [4], pumped to the 1# sedimentation tank [1] for reuse, and the filter cake [5] is landfilled after being solidified by cement;

[0022] In addition to heavy metal ions: add sodium...

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Abstract

The invention provides a recycling process of garbage fly ash ash-washing water, which comprises the steps of suspended substance separation, heavy metal ion removal, calcium and magnesium ion removal, filtration, mechanical compression and multi-effect evaporation. In the process, the heavy metal ions are removed in advance by adopting a method of adding sodium sulfide saline solution, depositing and filtering, and then a large amount of calcium and magnesium ion deposits obtained by subsequent depositing can be used as cement raw materials, thereby effectively improving the resource utilization ratio and reducing the comprehensive treatment cost; high-concentration saline sewage is subjected to the multi-effect evaporation to realize the recycling of water resources, and simultaneously the byproduct chloride can be used for other industrial uses; and the mechanical compression is technically combined with the multi-effect evaporation, so the energy consumption is only 1 / 4 of that of the conventional evaporation.

Description

Technical field [0001] The invention relates to the technical field of sewage regeneration and utilization, and is especially suitable for the treatment of high-salt sewage containing heavy metal ions. Specifically, it relates to a process for recycling waste fly ash washing water. Background technique [0002] Water recycling is one of the important ways to save water. Improving the effective utilization of water and recycling sewage is the fundamental way to solve the crisis of water resources and reduce pollution. At present, countries all over the world are conducting research on various sewage reuse technologies, and have achieved a series of results, and use recycled water as a reliable second resource for industry, agriculture and municipal administration. [0003] Garbage fly ash washing water is produced during the process of washing garbage fly ash to remove chloride ions. Because the fly ash washing water contains a large amount of sodium chloride and potassium c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/04C02F1/38C02F101/20
Inventor 顾军
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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