Boiler blowdown water recycling treatment technology based on ion exchange and chemical precipitation

A chemical precipitation and ion exchange technology, applied in the field of water pollution control, can solve the problems of large consumption of chemical agents, difficult to control effluent quality, and weakened inhibitory effect, so as to save high-quality water resources, save sludge disposal costs, and reduce treatment cost effect

Active Publication Date: 2016-11-09
SHANGHAI EMPEROR OF CLEANING HI TECH
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of removing phosphorus by calcium salt chemical precipitation, the pH of wastewater has a great influence on the removal effect of phosphorus precipitation. The higher the pH value, the better the effect of phosphorus removal. When the pH value of wastewater is 8.0, calcium carbonate CaCO 3 The formation of calcium hydroxyphosphate will obviously inhibit the formation of calcium hydroxyphosphate precipitate, and the phosphorus removal effect is poor, and when the pH value is 9.0, this inhibitory effect will be weakened
Therefore, in order to maintain a high removal rate of phosphorus in the effluent, it is usually necessary to add a large amount of lime to adjust the pH value of the wastewater to a higher value (10.0-11.0), which leads to a large consumption of chemicals and higher costs. The amount of mud has increased greatly, so the method of adding calcium salt is generally less used for chemical precipitation to remove phosphorus
[0009] Combining the above various chemical precipitation methods, they all show a certain degree of treatment effect in terms of targeted removal of phosphate. However, due to the many control conditions of the chemical precipitation method, it is affected by pH, temperature, and the type, ratio, and concentration of the chemical agent. The constraints of other factors are obvious, so the effluent water quality is also difficult to control, especially for the treatment of a large amount of low-concentration phosphate sewage in the boiler system, the chemical precipitation method alone not only greatly affects the reuse quality of the treated effluent, but also A large amount of chemical sludge will be generated, which will increase the cost of subsequent treatment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Boiler blowdown water recycling treatment technology based on ion exchange and chemical precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Taking the treatment of sewage from the boiler blowdown cooling tank of a natural gas purification plant in Sichuan as an example, the implementation steps are further explained.

[0050] (1): The total sewage discharge volume is about 30m 3 The / h boiler sewage is transported from the sewage cooling pool to the high-efficiency fiber filter for filtration. The diameter of the filter is Φ1200mm, and the height of the filter layer is 300mm. Filter output 25m 3 / h, the turbidity of the effluent water is less than 1NTU, and the SDI is less than 3.0.

[0051] (2): Send the filtered water in step (1) into the chlorine-type ion exchanger through the clean water pump, its diameter is Φ1000mm, the resin layer height is 800mm, and the design output of a single unit is 30m 3 / h, flow rate 15m / h. Control effluent PO through online phosphorus meter 4 3- 4 3- 8.81mg / l; effluent: turbidity 0.13NTU, pH7.13, conductivity 130us / cm, PO 4 3- 0.01mg / l.

[0052] (3): The high-qualit...

Embodiment 2

[0055] Take the mixed wastewater treatment of RB boiler in a large paper mill in Hainan as an example. The specific implementation steps are as follows:

[0056] (1): about 140m 3 / h Sewage and cooling pool mixed sewage and waste water conveyed to precision filter for filtration, the flow rate of a single filter is designed to output 60m 3 / h, the turbidity of the filter water is less than 1.0NTU, and the SDI is less than 5.0.

[0057] (2): Filter the water from step (1), and send it into the chlorine-type anion exchange resin through the clean water pump, its diameter is Φ2500mm, the resin layer height is 2200mm, and the design output of a single unit is 75m 3 / h, flow rate 25m / h. Control effluent PO through online phosphorus meter 4 3- 4 3- 12.72mg / l; effluent: turbidity 0.03NTU, pH6.96, conductivity 121us / cm, PO 4 3- 0.02mg / l.

[0058] (3): Send the high-quality effluent obtained in step (2) into the raw water tank of the boiler for use in the desalinated water syst...

Embodiment 3

[0061] Taking the treatment of power boiler sewage of a petrochemical enterprise in Zhejiang as an example, the implementation steps are as follows:

[0062] (1): will be about 66m 3 / h Boiler sewage is sent to a high-efficiency fiber filter for filtration, and the flow rate of a single filter is designed to output 45m 3 / h, the turbidity of the filter water is less than 1.0NTU, and the SDI is less than 3.0.

[0063] (2): Filter the water from step (1), and send it to the chlorine-type anion exchanger through the water pump. The diameter is Φ1500mm, the height of the resin layer is 1000mm, and the design output of a single unit is 65m 3 / h, flow rate design 20m / h. Control effluent PO through online phosphorus meter 4 3- 4 3- 10.5mg / l; effluent: turbidity 0.02NTU, pH7.81, conductivity 119us / cm, PO 4 3- 0.07mg / l.

[0064] (3): Send the effluent from the ion exchanger obtained in step (2) into the raw water tank of the boiler and enter the desalinated water system. When th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Conductivityaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a boiler blowdown water recycling treatment technology based on ion exchange and chemical precipitation. The technology comprises the following steps that boiler blowdown water is filtered by an efficient fiber filter, so that the turbidity of the filtered and purified blowdown water is decreased to be smaller than 1 NTU, and an SDI value of the filtered and purified blowdown water is smaller than 3; the filtered and purified blowdown water is delivered to an ion exchanger, effluent water exchanged by anion exchange resin enters a boiler raw water tank, and after the anion exchange resin is saturated, regenerating is conducted by adopting a regenerating agent, so that an exchange function of the anion exchange resin is recovered; coagulation treatment and flocculent precipitation treatment are conducted on regenerated waste liquid and backwashing waste liquid of the ion exchanger by adopting a coagulant and a flocculant. Compared with the prior art, the high-concentration waste liquid or regenerated liquid achieves solid-liquid separation by adding a small quantity of the coagulant and a coagulant aid through the coagulation effect and the flocculent precipitation effect while high-quality recycling on the boiler blowdown water is achieved through ion exchange, removal of phosphate in the boiler blowdown water is completed, and zero discharge of the boiler blowdown water is achieved.

Description

technical field [0001] The invention relates to a recovery and treatment process for boiler sewage, in particular to a recovery and treatment process for boiler sewage based on ion exchange and chemical precipitation, and belongs to the technical field of water pollution control. Background technique [0002] With the rapid development of industry and agriculture and the rapid expansion of urbanization, the shortage of water resources in my country has become more and more prominent. To solve the problem of water shortage, it is far from enough to rely solely on opening up new water sources, and the cost of water intake is gradually increasing. The difficulty is also increasing. At the same time, the utilization of water resources in my country is quite extensive at this stage. With the promulgation of new water-saving and energy-saving policies, we are objectively required to use the concept of circular economy to think about the control of industrial water pollution and imp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F9/04C02F101/10
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap