Novel L-aspartic acid waste water recycling utilization process

Abstract

The invention provides a novel process for circulating and reusing L-aspartic acid wastewater, belonging to the technical field of wastewater treatment and reuse. L-aspartic acid wastewater is nano-filtered at a temperature lower than 45 DEG C and with the operation pressure between 1.8 and 20 MPa, which can remove more than 98 percent of sulfate radical and more than 50 percent of ammonium ions;then nano-filtered concentrated solution is vacuum-concentrated so as to obtain crystals with main composition as ammonium sulfate; and nanofiltration clear liquid containing partial ammonium ions isdirectly circulated in L-aspartic acid production ingredients and / or is treated through a reverse osmosis membrane, and then is used as boiler steam water. The process thoroughly solves the ammonia-nitrogen pollution problem of the L-aspartic acid wastewater. Meanwhile, as production water is hermetically circulated, zero emission is achieved, which greatly saves water resources. The whole process has the advantages of high treatment efficiency, low operation cost and little energy consumption.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment and reuse, and particularly refers to a treatment process for recycling L-aspartic acid wastewater. Background technique [0002] In the production process of L-aspartic acid, due to the addition of ammonia and sulfuric acid, waste water containing a large amount of ammonium sulfate is generated. Its PH value is low, only 3 to 4, and ammonia nitrogen is high, reaching 10,000 to 20,000 mg / L. The traditional treatment methods include: (1). Send to a large sewage treatment plant for treatment. Due to the high nitrogen and sulfur content in the wastewater, the efficiency of biochemical treatment is low and the effect is poor, so it can only be mixed in a small proportion for treatment; (2), vacuum Concentration, because of the large amount of processing, the energy consumption is huge. Both of these methods have the problems of high one-time equipment investment, high difficulty and high oper...

AI Technical Summary

Problems solved by technology

[0003] The present invention is just to overcome the above-mentioned deficiencies, and provides a recycling treatment process for L-aspartic acid wastewater, which completely solves the problem of ammonia nitrogen pollution in L-aspartic acid wastewater, and at the same time makes the production water close cycle, achieving zero discharge, greatly saving water resources