System and method for utilizing, disposing and discharging salt-containing waste

A technology for waste and salty wastewater, applied in chemical instruments and methods, seawater treatment, natural water treatment, etc., can solve the problems of increased seawater salinity in offshore sea areas, unfavorable development of offshore aquaculture industry, and high production, utilization and disposal costs. Good environmental and economic benefits, lower disposal costs, and lower treatment costs

Pending Publication Date: 2021-08-03
周丹丹 +1
View PDF13 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] To sum up, it can be seen that a large amount of waste salt is produced in the fields of chemical industry, metallurgy, electroplating, and environmental protection. The composition of waste salt is complex, and it needs multiple separations and purifications to obtain relatively pure by-product salt. The cost of production, utilization and disposal is relatively high. At the same time, some After the factory treats the mixed salt solution, it is discharged into the offshore sea area through the pipeline, which will lead to an increase in the salinity of the sea water in the offshore sea area, destroying the regional marine environment, and is not conducive to the development of industries such as offshore aquaculture.
The ballast water of existing marine ships contains a lot of microorganisms and bacteria, and the marine ecological environment is affected due to the cross-discharge of ballast water during the ship's voyage; the structure of the ballast water tank is complex, and it is difficult to carry out effective disinfection

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
  • System and method for utilizing, disposing and discharging salt-containing waste
  • System and method for utilizing, disposing and discharging salt-containing waste
  • System and method for utilizing, disposing and discharging salt-containing waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take waste salt from a chemical company, and detect its composition as sodium chloride 0.5-6.42%, potassium chloride 8.36%, sodium bicarbonate 7.52%, sodium carbonate 1.08%, sodium benzoate 3.84%, 2-aminopyridine 1.46%, other organic matter 2.13%, water 27.16% and traces of other impurities. In view of the high sodium chloride content of the waste salt and the presence of harmful impurities such as organic matter and carbonate, high temperature melting, water dissolution and filtration can be used to remove insoluble matter, the filtrate can be adjusted to pH 7-8 with hydrochloric acid, and inorganic salts can be added to adjust the components.

[0049] Take 100 grams of the above-mentioned waste salt and put it into a molten salt furnace, slowly heat up to 600°C, after drying and preheating, heat up to 1300°C to melt to remove organic matter and some insoluble residues, cool down, add water to dissolve, and filter to remove insoluble matter . The solution was adjusted...

Embodiment 2

[0059] Take 1000 grams of metallurgical saline wastewater, which contains 0.12% sodium chloride, 16.24% sodium sulfate, 64ppm copper, 8138ppm zinc, 62ppm chromium and a small amount of other impurities. In view of the characteristics of heavy metal harmful impurities in the saline wastewater, heavy metals can be removed by adding chemicals after adjusting the pH value.

[0060] The pH of the aqueous solution is adjusted to 8.0 under stirring, a heavy metal scavenger is added thereto, and then a polyacrylamide solution is added, and after standing still, impurities such as precipitates are filtered to obtain an impurity-removing salt solution. The solution was concentrated to dryness to obtain the inorganic salt. After testing, the inorganic salt contains 32.45% sodium, 0.56% chlorine, 66.95% sulfate, 2ppm copper, 14ppm zinc, 3ppm chromium, fluorine (ND), lead (ND), barium (ND), arsenic (ND), and a small amount of others Impurities, the above are mass percentages (calculated a...

Embodiment 3

[0064] The by-product salt washed with fly ash contains 29.94% of sodium, 9.52% of potassium, 2.02% of calcium, 58.44% of chlorine, 2ppm of copper, 9ppm of zinc, 3ppm of nickel, 2ppm of lead and a small amount of other impurities in the mixed salt. Percentage (calculated on solid matter).

[0065] The fly ash was washed with chloride and fresh water to prepare different proportions of saline solution. After standing for 0.5-6 hours, the number of E. coli colonies in the water solution was detected. The experimental detection data are shown in the table below.

[0066]

[0067] The fly ash was washed with chloride and seawater to prepare different proportions of saline solution. After standing for 0.5-6 hours, the number of E. coli colonies in the water solution was detected. The experimental detection data are shown in the table below.

[0068]

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

No PUM Login to view more

Abstract

The invention provides a system and method for utilizing, disposing and discharging salt-containing waste based on comprehensive consideration of enterprise waste recycling and ship ballast water sump and ballast water treatment. According to the invention, by-product salt is obtained after waste salt is refined; the by-product salt is added into a ballast water sump, so the salinity of a solution in the ballast water sump is improved, microorganisms in the ballast water sump and ballast water are inhibited and killed, and waste salt recycling is achieved; and the salinity of an offshore sea area is not affected, and the ecological environment influence caused by offshore discharging of a salt-containing aqueous solution is reduced.

Description

technical field [0001] The invention belongs to the environmental protection field of waste disposal and utilization, ballast water tank treatment and ballast water treatment collaborative treatment, and specifically relates to a method for utilization, disposal and discharge of salty waste. Background technique [0002] Background 1. In the production process of chemical industry, metallurgy, electroplating and waste incineration, a large amount of complex inorganic salts will be produced. These waste salts cannot be directly used as industrial raw materials; they are generally disposed of as waste, and the treatment cost is expensive, increasing The production cost of the enterprise has been increased, and the recycling and utilization of resources have not been fully realized. At present, there are two commonly used methods to deal with this kind of salt. One is to decompose and oxidize the organic matter in the inorganic salt by high-temperature calcination, and then dis...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/50C02F103/08
CPCC02F1/50C02F2103/008C02F2103/08
Inventor 周丹丹王闻伟倪江中
Owner 周丹丹
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