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Method for treating and recycling circulating wastewater

A technology for sewage and circulating water, applied in the fields of flotation water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc. Effect

Active Publication Date: 2012-07-04
北京新金应利科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for treating and reusing industrial circulating water sewage. The method is aimed at the operating characteristics of the industrial circulating water system and the nature of the sewage. Through a set of scientific and reasonable treatment process, nanofiltration, reverse The problem of high operating cost of osmosis technology, and the treated sewage retains a certain ion content, so that the effluent meets the water quality requirements of the circulating water system. The method of the present invention is suitable for the characteristics of high salt content and high hardness of the circulating water system, and is more It can effectively realize the continuous treatment and water production of circulating water sewage

Method used

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  • Method for treating and recycling circulating wastewater
  • Method for treating and recycling circulating wastewater
  • Method for treating and recycling circulating wastewater

Examples

Experimental program
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Embodiment 1

[0066] Embodiment 1 The specific embodiment of the processing system that the process of the present invention adopts

[0067] Please combine Figure 1-Figure 4 , this embodiment provides a recycling treatment system for circulating water and sewage, including a flocculation-air flotation-filtration integrated device, a security filter and a frequent electrode reversal electrodialysis device, wherein,

[0068] The flocculation-air flotation-filtration integrated device is equipped with a flocculation zone 1, an air flotation zone 4 and a filtration zone 6. The flocculation zone 1 is provided with a sewage inlet 11, and the flocculation zone 1 is connected to the air flotation zone 4; A plurality of baffles 12, the spacing of these baffles 12 increases gradually along the water flow direction, and the distance adjacent to the air flotation area 4 forms a contact chamber 3, in which the dissolved air of the dissolved air and water release mechanism is arranged. Water release de...

Embodiment 2

[0076] Example of Circulating Water Sewage Treatment and Reuse

[0077] Due to the serious differences in water quality in different regions and the concentration ratio of circulating water in different regions, there are also great differences in the quality of circulating water sewage and fresh replenishment water. The applicant in this case made statistics on the circulating water sewage and fresh water replenishment water quality of 15 circulating water fields in 9 regions across the country. The specific statistical results are shown in the table below:

[0078] Table 4: Statistical Table of Circulating Water Sewage and Replenishment Water Quality of 15 Circulating Water Fields in 9 Regions of the Country in 2007

[0079] serial number

[0080] From the statistical results in Table 4, it can be seen that the salinity level of the circulating water of Lanzhou Petrochemical and 14 water fields in 9 regions of the country is lower than that of the circulating water ...

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Abstract

The invention provides a method for treating and recycling industrial circulating wastewater, which comprises the following steps of: adding a polyacrylamide flocculant into the circulating wastewater to perform flocculation reaction, wherein 4 to 8mg of flocculant is added into every 1L of sewage and the flocculation reaction time is controlled to be at least 5 minutes; allowing the sewage afterthe flocculation reaction to enter a high-efficiency floatation tank, controlling the air floatation time to be at least 10 minutes, allowing the air floatation water to discharge into a filter tank,and discharging the water after filtering; adding an acid into the filtered discharged water to regulate the alkalinity of the water body, adding a scale inhibitor and delivering the water to a cartridge filter; and delivering the filtered effluent from the cartridge filter to an electrodialysis reversal system to perform desalination, wherein the effluent treated by the electrodialysis reversal system is used as make-up water for circulating water. The method can more effectively realize continuous treatment of the sewage and water production without using nanofiltration and reverse osmosis technology; the treated sewage keeps a certain amount of ions; and the effluent meets the requirements of the water quality of reused water of a circulating water system.

Description

technical field [0001] The invention belongs to the technical field of sewage regeneration and utilization in water treatment technology, and in particular relates to a method for treating and recycling circulating water sewage. Background technique [0002] The shortage of water resources is a problem faced by most parts of the world today, especially in China. With the rapid development of science and technology and the improvement of industrialization level, the shortage of water resources has become one of the important factors restricting the development of cities and industries. The circulating cooling water system is a large water user, accounting for about 70% of the total industrial water consumption. Therefore, it is very important to study and explore the water-saving process of circulating cooling water. [0003] Because circulating water is used repeatedly in the water circulation system for a long time, it has the characteristics of concentrated dissolved solid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/52C02F1/24C02F1/66C02F5/08C02F1/469
CPCY02A20/124Y02A20/131
Inventor 郑卫民倪望青谢勇唐鹏耿晓彬
Owner 北京新金应利科技发展有限公司
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