Desulfurization waste water recycling and zero discharge system and method
A desulfurization wastewater, zero-discharge technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. And the effect of reducing operating costs, improving economic and environmental benefits, and saving costs
Inactive Publication Date: 2014-08-13
XIAN TPRI WATER & ENVIRONMENTAL PROTECTION +2
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The aforementioned membrane-based desulfurization wastewater treatment technology patents only consider the treatment of desulfurization wastewater separately, and do not consider the water quality requirements of the desulfurization system for reused water
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[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0031] Such as figure 1 As shown, the present invention includes a desulfurization tower 1 and a sedimentation tank 2 connected with the desulfurization tower 1, the water outlet of the sedimentation tank 2 is connected with the filter tank 3, and the water product outlet of the filter tank 3 is connected with the membrane filter 4, and the membrane filter The water production outlet of 4 is connected to the nanofiltration device 5, and the backwash drainage outlets of the filter tank 3 and the membrane filter 4 are respectively connected to the entrance of the sedimentation tank 1; the entrance of the nanofiltration device 5 is provided with a scale inhibitor dosing device 13. The concentrated water outlet of the nanofiltration device 5 is connected to the desulfurization tower 1, the fresh water outlet of the nanofiltration device 5 is connected to the soft...
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Abstract
The invention relates to a desulfurization waste water recycling and zero discharge system and method. The desulfurization waste water recycling and zero discharge system comprises a desulfurization tower, a filter and a nanofiltration device which are sequentially connected, wherein a scale inhibitor dosing device is arranged at the inlet of the nanofiltration device, the concentrated water outlet of the nanofiltration device is connected with the desulfurization tower, the fresh water outlet of the nanofiltration device is connected with a saline water concentrating device, the fresh water outlet of the saline water concentrating device is connected with a fresh water tank, the concentrated water outlet of the salt water concentrating device is connected with a crystallizer, and the condensed water outlet of the crystallizer is connected with the fresh water tank; a drying encapsulating machine is arranged at the solid outlet of the crystallizer. The desulfurization waste water recycling and zero discharge system has the advantages that desulfurization waste water discharged from the desulfurization tower is filtered and then is fed into the nanofiltration device, nanofiltration concentrated water returns to the desulfurization tower, nanofiltration fresh water is treated by virtue of the salt water concentrating device and then is crystallized by virtue of the crystallizer, the obtained fresh water is recycled in the fresh water tank, and salt is separated out, dried into crystallized salt and transported outside after being encapsulated, so that zero discharge of the desulfurization waste water is realized, quality of the recycled fresh water is improved, and a chemical agent and operating cost are saved.
Description
technical field [0001] The invention belongs to the technical field of industrial wastewater treatment and resource recycling, and in particular relates to a desulfurization wastewater recycling and wastewater zero discharge system and method. Background technique [0002] At present, limestone-gypsum wet desulfurization system is generally used in thermal power plants. In order to maintain a stable concentration of chloride ions in the desulfurization slurry, a certain amount of desulfurization wastewater needs to be discharged. The suspended solids, salt content, hardness, chloride ions, and sulfuric acid in the desulfurization wastewater The root and silica content are high, and it also contains a certain amount of heavy metal ions, which is highly polluting. It is a kind of industrial wastewater that needs to be treated in thermal power plants. The common treatment process of desulfurization wastewater is: aeration oxidation-neutralization-flocculation-sedimentation-clar...
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IPC IPC(8): C02F9/10
Inventor 王璟庞胜林毛进杨宝红何高祥王正江王金磊许臻张江涛叶治安
Owner XIAN TPRI WATER & ENVIRONMENTAL PROTECTION
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