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New technique for deeply treating industrial waste water by RO membrane

An advanced treatment, reverse osmosis membrane technology, applied in the field of reverse osmosis membrane treatment technology, can solve the problems of secondary pollution of cleaning wastewater, frequent cleaning, high primary investment, and achieve high COD content in influent water, prolonged cleaning cycle, engineering The effect of investment reduction

Active Publication Date: 2012-11-28
辽宁莱特莱德环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 2. Low water utilization rate: the recovery rate is around 65%-80%
[0021] 4. The cleaning cycle of the membrane is short: cleaning is frequent, and the cleaning wastewater causes secondary pollution
[0022] 5. The process is complicated: the treatment process causes a high investment and a very high operating cost
[0023] The industrial wastewater to be further treated is generally the wastewater that meets the discharge standards, COD<120mg / l, even after secondary biochemical, air flotation, filtration, advanced oxidation and other pretreatment processes, it still contains a large amount of suspended solids, colloids, organic matter, etc. Pollutants, which can cause serious pollution of reverse osmosis, frequent cleaning and shortened service life
Some industrial wastewater has poor biodegradability, and the effect of secondary biochemical removal of COD is not obvious; the use of advanced oxidation technology to remove COD is restricted by the reducibility of organic matter and equipment investment.

Method used

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  • New technique for deeply treating industrial waste water by RO membrane
  • New technique for deeply treating industrial waste water by RO membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Traditional filtration system: Mechanical filters, multi-media filters, fiber filters, microfiltration, ultrafiltration, etc. can be selected according to the quality of raw water; the minimum requirement for entering the membrane is SDI≤5.

[0046] 2. Specially designed pretreatment system: firstly remove CO2 through decarburizer, control CO2≤3.0mg / l, and then through ion exchange softening process, remove calcium and magnesium ions in water, control total hardness (calculated by CaCO3)≤1.0mg / l, and finally adjust the pH value to 10.0 by NaOH.

[0047] 3. RO reverse osmosis membrane treatment system: The water flux of RO membrane is based on the difference of TDS and chloride content of the feed liquid. The membrane flux is in the range of 14-18GFD (gallon / square foot*day) after strict calculation, design and selection.

[0048] 4. Use effect description: The project investment is more than 30.0% less than the traditional reverse osmosis process for advanced treatm...

Embodiment 2

[0050] Using this patented technology to do field tests in the following industrial wastewater:

[0051] A: Wastewater after sewage treatment in a dye factory, the main component of COD is aminobenzenesulfonic acid, aminobenzenesulfonic acid is a common dye intermediate, soluble small molecular weight organic matter, it is difficult to remove by reverse osmosis pretreatment, and it will pollute the reverse osmosis membrane serious. COD is 130mg / l, TDS is 1896mg / l, first remove CO2 by decarburization; reach CO2≤3.0mg / l, and then soften, total hardness (calculated by CaCO3)≤1.0mg / l.

[0052]B: Wastewater from a petrochemical plant did not meet the required discharge standards after treatment, mainly petroleum gas, wax oil, residual oil, asphalt, propylene, petroleum coke, dimethyl carbonate, pharmaceutical grade propylene glycol, industrial grade propylene glycol, propylene carbonate, diisopropyl The wastewater produced in the production process of ether and other products is b...

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Abstract

The invention provides a new technique and a device for deeply treating industrial waste water by a reverse osmosis (RO) membrane. Standard discharge waste water is pre-treated by traditional filtration, decarbonation, de-hardness and Ph value regulation and then enters an RO membrane device for treatment. Compared with the traditional technique for deeply treating waste water by a reverse osmosis membrane, the new technique has high recovery efficiency of purified water, relatively wide water intake COD content, prolonged cleaning period, greatly reduced investment of the project over the same period and lower operation cost than convectional treating. The new technique can be widely used for deeply treating industrial waste water in the fields of printing and dyeing, petrifaction, papermaking, coking, spinning, agriculture, and the like, so as to save water resources, thus being in line with the environment-friendly laws and regulations for current recycling economy and waste waterrecycling. The invention can be used for treating municipal waste water, industrial waste water, micro-polluted water, sea water desalinization and saline water desalination, and can be applied to the field where water needs to be deeply purified.

Description

technical field [0001] The invention relates to an RO membrane technology for advanced treatment of industrial wastewater, in particular to a technology for treating industrial wastewater containing refractory COD using a reverse osmosis membrane method. Background technique [0002] Membrane technologies applied to wastewater treatment mainly include MBR, MF / CMF, UF, RO, ED, etc.; but the most thorough treatment is (RO) reverse osmosis membrane water treatment technology, which can remove almost all organic matter, suspended matter, microorganisms , bacteria, viruses, colloids and even various salt metal ions. [0003] Reverse osmosis (RO) technology is a membrane separation technology driven by pressure. Because reverse osmosis technology has the advantages of no phase change, componentization, simple process, convenient operation, small footprint, low investment, and low power consumption, it has developed very rapidly. In recent years, my country's reverse osmosis tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44C02F1/66C02F1/20C02F5/00C02F103/32C02F103/28C02F103/08
CPCY02A20/131
Inventor 侯胜利戈亮颜郁赵兵兵
Owner 辽宁莱特莱德环境工程有限公司