1. technical name

Mobile high-salt organic waste liquid disposal technology and device based on ionic membrane.

2. scope of application

Treatment of wastewater and waste liquids from coal chemical industry, papermaking industry, oil field drilling and production, and electroplating.

3. technical content

3.1 The technical principle targets the concentrated brine produced in typical industrial industries, and uses a two-stage electric drive membrane (ED)+ reverse osmosis membrane (SWRO) coupling process to achieve brine separation. Desalted water meets the quality of boiler makeup water. Highly concentrated brine further uses salt and nitrate fractional crystallization process to achieve the fractional crystallization of sodium sulfate and sodium chloride. Desalted water is reused for replenishment water in the circulation system. This technology can achieve efficient separation of brine at normal temperature, normal pressure, and low energy consumption. Equipment modular design parameters: waste liquid flow is 5m3/h, desalinated water recovery rate is>85%.

3.2 main innovations

(1) For different complex water quality, optimized anti-pollution ionic membranes and electrically driven ionic membrane element structures with special adaptability have been developed, realizing complete sets of electrically driven ionic membrane stacks suitable for industrial high-salt wastewater and reverse osmosis concentrated water., serial production. (2) A wastewater concentration and reuse system process that is highly coupled with industrial production processes has been developed. The concentrated brine reaches the economic target, solves the problem of difficulty in treating brine with traditional methods, and realizes the resource utilization of industrial wastewater. (3) For industrial wastewater with high COD and high hardness, a highly targeted and efficient system integration process has been developed to achieve near-zero emission of heavily polluted wastewater.

4. Pollution control or environmental restoration effects

The desalinated water index of this technology reaches TDS≤500mg/L (meeting the industrial fresh water reuse standard) and SS≤1mg/L. The discharged water quality can replace industrial fresh water, achieving near-zero emission of industrial high-salt waste liquid/wastewater. Compared with mechanical vapor recompression technology (MVR) and disk and tube reverse osmosis membrane (DTRO), the process route is simple, and the investment cost is only 40% to 60% of the former. It can be directly skidded on site and is more suitable for point source management.

5. Technology demonstration

During the period from 2014 to 2022, this technology has been used in the general contracting project of the coal chemical wastewater concentration section of Zhongke Baohua New Materials Project.(Sodium sulfate concentration 200g/L), Guodian Group Handan Thermal Power Plant desulfurization wastewater zero-emission project (sodium sulfate concentration 150g/L), Yangmei Group Shouyang Chemical Co., Ltd.(the first domestic set of 200,000 tDMO, Japan Ubu Industrial Technology Package) ED sodium nitrate concentration section subcontracting, Ulanhot Xing 'an League Inner Mongolia, used in projects such as the zero-emission project. In 2014, the second phase of the 35,000 m3/d reclaimed water reuse project in Nantong Economic Development Zone, Jiangsu Province, the concentrated brine unit operated stably for a long time at a concentration of 140g/L. The process was simple, the energy consumption was 8.5 (kW·h)/m3, and the operating cost was 5.5 yuan/m3.

6. investment estimation

The investment per ton of water for complete sets of equipment is about 200,000 yuan/m3.

7. Prospects for transformation and promotion of technological achievements

my country's industrial industry has a large amount of high-salt wastewater emissions and serious pollution, and traditional treatment processes have certain limitations. This technology provides a practical solution for the harmless and resource treatment of salt-containing wastewater from chemical processes and heavy metal brine discharged from industrial mining hydrometallurgy, especially for the treatment of salt-containing wastewater in the coal chemical industry, and has good promotion and application prospects.