Technology for recycling low-calcium and low-chlorine purified water

A water purification and process technology, applied in the field of environmental engineering, can solve the problems of high cost, achieve the effect of high reuse rate of reused water, realize zero discharge of waste water, and low cost of waste water treatment

Inactive Publication Date: 2015-03-11
ZHUZHOU SMELTER GRP
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These generated particles can strongly coagulate and adsorb organic or inorganic colloidal particles in wastewater, and at the same time, under the action of overvoltage, O 2 and H 2 , during its ascent process, the colloidal particles and oil slicks in the wastewater are adhered to float together, so as to achieve

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
  • Technology for recycling low-calcium and low-chlorine purified water
  • Technology for recycling low-calcium and low-chlorine purified water

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Such as figure 1 As shown, one or more high-efficiency flocculants of polyiron, polyaluminum, and polyacrylamide are added to wastewater containing heavy metals, and the groups in the flocculant will undergo coordination reaction with heavy metal ions to form alum. For liquid caustic soda, adjust the pH to 9-11 to make the coordination bond more stable and facilitate sedimentation. Finally, the solid-liquid separation is carried out through the inclined plate sedimentation tank to remove most of the heavy metal ions.

[0019] The supernatant water after removing heavy metal ions enters the buffer tank, and the water in the buffer tank is added with sodium carbonate and Na 2 CO 3 .10H 2 O is 99% industrial purity, the preparation concentration is 10%, and the density is about 1.2 g / mL. It is necessary to reduce the calcium ion content of the pretreatment influent water to below 50 mg / L, and overdosing according to the overdose factor 1.5 times. Wastewater with a calcium cont...

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 discloses a technology for recycling low-calcium and low-chlorine purified water after heavy-metal-containing wastewater is treated. A high-efficiency flocculating agent is added into the heavy-metal-containing wastewater; by acid-base adjustment, the pH is adjusted to be base, and solid-liquid separation is finally executed through an inclined plate settling basin so as to remove most heavy metal ions; supernate enters a buffering water basin for calcium reduction treatment and then enters an ultrafiltration-reverse osmosis system for advanced purification; produced fresh water serving as production water returns to a production system, and concentrated water serves as water for flushing residues. Part of bottom flow subjected to calcium reduction is used as crystal seeds for backflowing, and most of the bottom flow enters the buffering water basin for repeated use. The recycling rate of the recycled water is high; the phenomenon of calcium scaling is avoided; the wastewater treatment cost is low, and zero emission of the wastewater is realized.

Description

technical field [0001] The invention relates to a process for the treatment and reuse of heavy metal wastewater, in particular to a process for the treatment and recycling of wastewater containing one or more heavy metals such as cadmium, arsenic, lead, zinc, copper, etc. It belongs to the field of environmental engineering. Background technique [0002] The rapid development of industrialization has caused a large amount of heavy metal wastewater to be discharged into the environment. The acidic heavy metal wastewater has a low pH (pH value between 4-6) and contains a variety of heavy metal ions, such as Cu 2+ 、Cd 2+ , Pb 2+ , Zn 2+ 、As 2+ etc., they cannot be decomposed by organisms, and once they enter the environment, they will continue to accumulate in the environment, causing serious pollution to water bodies and even destroying the ecological environment. Many domestic smelting enterprises have purified water reuse systems, and the purified water treated by tradi...

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): C02F9/04
CPCC02F9/00C02F1/441C02F1/444C02F1/52C02F1/56C02F1/66C02F5/06C02F2103/10C02F2103/16
Inventor 张天芳李迪汉刘宏志雷宇李正明张伟陈顺高盟
Owner ZHUZHOU SMELTER GRP
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