Disposal of concentrated brine wastewater is difficult? New technology uses "concentrated brine wastewater + multiple solid wastes" to prepare green and low-carbon building materials
Published Time:
2024-09-24
Source:
Author:
Currently, with the widespread application of reverse osmosis membrane technology in the production of high-quality reclaimed water, the problem of a large amount of concentrated brine wastewater that is difficult to dispose of has become an increasingly prominent bottleneck in the high-quality development of wastewater resource utilization in China. How to achieve efficient and low-cost treatment and resource utilization of concentrated brine wastewater has become a pressing issue that needs to be addressed.
At the 2024 Tsinghua University-Beijing Yizhuang Engineering Doctor Forum held recently, Liang Siyi, chief expert of environmental engineering at China Metallurgical Group, chief expert at MCC-Jingcheng Engineering, and innovative leader engineering doctor at Tsinghua University, told reporters.
It is understood that high-quality reclaimed water reverse osmosis concentrated brine wastewater is generally concentrated and reduced in volume, becoming a concentrated waste liquid accounting for about 5%-10% of the total influent. The total dissolved solids content in the water is not less than 40000mg/L, containing a large number of various chemical reagents used in wastewater pretreatment, chlorination, dechlorination, and desalination processes, such as scale inhibitors, bactericides, acids, and by-products of chemical reagent reactions. If not handled properly, it is easy to cause environmental pollution.
Currently, Evaporation crystallization technology is the mainstream method for treating concentrated waste liquid. By heating the concentrated brine to evaporate it, and then condensing and recovering the evaporated water to obtain crystalline products Based on the measured data of a project in Hebei Province, the evaporation crystallization process of concentrated waste liquid consumes 94 kWh of electricity per ton of water and 0.4 tons of steam, with a comprehensive water treatment cost of 52.7 yuan per ton, which is far higher than the purchase price of municipal tap water. The high treatment cost is also a key factor why many concentrated brine waste liquid disposal projects are not put into use." Liang Siyi introduced.
To address this challenge, relying on the Tsinghua-Yizhuang integrated innovation platform, the MCC-Jingcheng Water Research team led by Liang Siyi, in collaboration with Professor Ni Wen's team at the University of Science and Technology Beijing, Based on the analysis of the characteristics of concentrated water quality, the team expanded the application of the "double salt effect" and "silicon's tetrahedral isomorphic effect" principles to construct a technical system for the synergistic resource utilization of concentrated water and typical large-scale general solid waste.
After years of continuous research, the team successfully bonded active ions such as organic matter, heavy metals, Na, and Cl in concentrated water to the mineral lattice during the generation of new double salt minerals, producing high-performance green and low-carbon building materials such as 3D printing mortar, thermal radiation insulation materials, and antifreeze non-fired bricks.
“I believe this is a more adaptable and economical new approach for synergistically utilizing resources to effectively solve the problem of concentrated brine wastewater disposal,” Liang Siyi told this reporter.
According to Liang Siyi, the performance test results of high-performance green and low-carbon building materials produced from "concentrated brine wastewater + multiple solid wastes" show that the radioactivity detection, resistance to sulfate erosion, compressive strength, freeze-thaw resistance, chloride ion penetration resistance, and carbonation resistance indicators all meet national standards and user needs, and have obvious cost advantages.
Taking 3D printing mortar as an example, through the scientific salt distribution ratio and material particle surface liquid film structure control technology proposed by Professor Hu Wentao of the University of Science and Technology Beijing, the low-temperature and workability of the mortar can be effectively improved. Under the same performance conditions, the cost is only 30% of the market price of 3D printing mortar.
“The future development direction of water technology, water industry, and water technology needs to break through the industrial limitations that only aim at pollution control,” Liang Siyi said. “We need to create new productive forces through cross-border multi-element integration and regional element cycle, forming a broader environmental technology and industrial layout.”
Recommended Dynamics
Address: 3rd Floor, Building C15, Phase II, Dongyi International Media Industrial Park, Chaoyang District, Beijing
Email:mkt@horwater.com
Email：
Tel：
Tel：
图片alt标题设置： Horwater Environment (Beijing) Co., Ltd.
表单验证提示文本： Content cannot be empty!
循环体没有内容时： Sorry,no matching items were found.
CSS / JS 文件放置地