The sales of glyphosate wastewater pre-treatment solutions have been good. However, according to many years of investigation and monitoring by the Plant Protection and Environmental Protection Department, it was found that 10% glyphosate water solution will cause soil compaction and cause serious soil and water pollution. To this end, the Ministry of Agriculture, Ministry of Industry and Information Technology jointly issued a document 1158 at the beginning of this year, which stipulates that the production and sale of 10% glyphosate water solution will be prohibited from next year. Therefore, the problem of how to treat mother liquor becomes almost every glycine method. Phosphine production plant life and death license. 1.2. Method of treating glyphosate mother liquor For the treatment of mother liquor, in principle, there are three methods: First, reform the process to achieve clean production, to achieve zero emissions; second is to recycle the glyphosate and glyphosate, and then Residual liquids are harmlessly treated. Third, the combination of chemical physics and biochemical treatment is used to harmlessly treat the diluted mother liquor. The problem of process reform cannot be solved overnight. It requires a long period of experimentation and exploration. It is more realistic to use the second and third methods to solve the problem of glyphosate mother liquor treatment. 1.3 Problems with Membrane Separation Technology Domestic use of membrane separation technology was initially recommended for the recovery of glyphosate in mother liquors. However, tests have shown that (nanofiltration) membrane separation technology can desalt and concentrate dilute mother liquors, but there are also a series of Technical, economic and environmental issues: (1) Poor adaptability According to our investigation, not all glyphosate mother liquors can be concentrated and separated using nanofiltration membranes. Some mother liquors are under 3.0 MPa pressure. There is also no drop of water; (2) How to handle the concentrated solution obtained from the concentrated liquid contains glyphosate, organic by-products and phosphites in addition to glyphosate, using this high concentration of complex components It is very difficult for the concentrated liquid to formulate more than 30% of the glyphosate water solution. Even if formulated, the cost is relatively high. (3) How to treat membrane effluent In order to elute high concentrations of salts in the mother liquor, a 3-4 stage nanofiltration elution process is required. For each 1 ton of mother liquor treated, 1.2 tons of membrane effluent is to be produced. The COD in the effluent is 5000-8000 mg/liter. L, salinity 4%-5%, total phosphorus 1000-2000 mg/l, how to deal with this part of the water is still a problem. (4) Membrane fouling and high operating costs It goes without saying that membrane contaminants are very serious during the concentration and separation of glyphosate mother liquor. Therefore, frequent membrane cleaning and membrane column replacement will result in high operating costs. 1.4. Difficulty of physicochemical-biochemical treatment From the perspective of sewage treatment, the physical and biochemical treatment of glyphosate mother liquor is also very difficult. The main reasons are: (1) COD concentration is between 40000-50000 mg/l. Poor oxidizability and biochemical properties, BOD/COD ratio is less than 0.2; (2) Total salinity is as high as 15%-20%, so how to use low-cost method to reduce the concentration of salt to the biochemical treatment tolerable concentration range Internally, it is the biggest problem in the treatment of glyphosate mother liquor. (3) Total phosphorus up to 20,000 mg/l, especially one-third of which is a phosphite that is difficult to oxidize and hard to precipitate. In summary, for a high-concentration, multi-component glyphosate mother liquor, it is obviously not possible to adopt a single technology for treatment. It is necessary to adopt a combination of multiple physical and biochemical technologies before it is possible to put glycyside within a reasonable processing cost. The phosphine mother liquor is treated to a detoxifying degree. 2.2 Pretreatment process 2.3 Process description Glyphosate wastewater is adjusted to pH=3.0-3.5 by acid addition, and then NaClO is added for chemical oxidation reaction. During the process, the reaction is stirred for 1 hour. The water enters the multi-dimensional electrocatalytic reactor for secondary oxidation. Reduction reaction. The organic phosphorous, phosphorous, and other components of the wastewater can be oxidatively decomposed into orthophosphates and removed. Hard-to-degrade organic matter is simultaneously decomposed into small molecules of easily degradable organic matter. The mechanism of electrocatalytic oxidation is the direct degradation of organic matter through the anode reaction, or the generation of hydroxyl radicals (OH) and ozone-like oxidants to degrade organic substances through the anode reaction. This degradation pathway makes the decomposition of organic matters more thorough and less likely to produce toxic intermediate products. More in line with the requirements of environmental protection. 2.4 Operating costs 2.4.1 Electricity costs about 30 yuan / ton of water 2.4.2 Pharmacy costs, the need for hydrogen peroxide as the sewage 5 ‰, hydrogen peroxide price according to 2,000 yuan / ton, then the pharmaceutical costs = 10 yuan / ton of water; waste acid and Other pharmaceuticals 40 yuan / ton. Total operating cost = 80 yuan/ton of water.
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