Glyphosate-producing wastewater treatment integration technology

Abstract

The invention discloses a gyphosate-producing wastewater treatment integration technology. The technology comprises steps as follows: micro-electrolysis treatment is performed under the aeration condition, toxic and degradation-resistant organic matters in wastewater are oxidized by a Fenton regent comprising hydrogen peroxide and ferrous ions which are by-products produced by ferric carbon filler, after lime is added to effluent and pH is regulated to 8-9, a flocculating agent is added for precipitation, suspended matters and iron-phosphorus precipitates are removed, effluent after precipitation is sent to an upflow anaerobic reactor, and degradation-resistant and toxic organic matters in wastewater are further degraded, removed and transformed, the effluent enters a multi-stage contact oxidation pond and a primary aeration sedimentation tank for biochemical treatment, the treated wastewater is emitted up to standard, and the organic matter removal rate in a pretreatment combination physicochemical technology can be up to 50%. The technology is stable in operation and good in treatment effect, the treatment cost is reduced, and the treated effluent can meet the integrated wastewater discharge standard (GB-8978-1996).

Description

technical field [0001] The invention relates to an industrial waste water treatment process, in particular to a process method for glyphosate pesticide production waste water treatment including physical, chemical and biological treatment. Background technique [0002] Glyphosate (PMG) is the largest pesticide export species in my country and is a broad-spectrum herbicide. One of the mainstream domestic production processes is the iminodiacetic acid (IDA) route, and its production wastewater contains iminodiacetic acid salts , chloroacetic acid, ammonium triacetate, glycine and other difficult-to-biodegradable organic substances, and contain a large amount of methanol, formaldehyde, glyphosate, dimethyl phosphite and salts, etc., and the annual production of glyphosate mother liquor wastewater in the country is about 2 million Ton. Glyphosate production wastewater belongs to toxic and harmful industrial production wastewater. The wastewater has the characteristics of large di...

AI Technical Summary

Problems solved by technology

Since the glyphosate in it cannot be recycled, it will pollute the environment and cause a certain waste of resources

[0003] In May 2013, the state initiated an environmental inspection of the glyphosate industry. The main contents of the inspection include: total pollutant emission reduction tasks, waste water discharge up to standard, waste gas recovery and treatment, waste water treatment facilities, mother liquor recovery device, solid waste treatment, process Pollution control, etc., and the water quality of such wastewater is complex (COD cr =5000~17000 mg / L, NH 3 -N<500mg / L, TP<20~100mg / L, formaldehyde=3000~5000mg / L, chloride ion<10000mg / L, pH=2.0~4.0), the degradation is difficult, and the traditional process is difficult to fully degrade, resulting in difficult drainage Discharge up to the standard, causing serious pollution to the environment, has become the bottleneck of enterprise development

However, due to the high concentration of organic matter, a large amount of oxidant is theoretically required, and it is unrealistic to completely oxidize all organic matter into inorganic matter, and the processing cost is too high for manufacturers to afford.

[0007] ② Hydrogen peroxide / O 3 The oxidation method mainly uses hydrogen peroxide and O 3 The combination of strong oxidizing properties oxidizes organic matter such as organic phosphorus and organic nitrogen in the mother liquor into inorganic matter in a certain pH environment. The oxidation degree of this oxidation method is limited, and the decomposition rate of organic matter in wastewater is only about 40%. Oxidation is not complete, unable to achieve the purpose of effective treatment or auxiliary treatment

[0010] ⑤ Resin adsorption method is to realize the recovery of useful substances such as glyphosate in wastewater through the selective adsorption of adsorption resins such as large pores, which is conducive to saving resources and reducing the difficulty of subsequent treatment. However, glyphosate wastewater has many impurities and is harmful to resins. Adsorption has great limitations and incompleteness. At present, the method is still in the small test stage, and the recovery rate is only about 45%.

However, SBR relies heavily on modern automation control technology, which requires a high degree of automation, operation, management, and maintenance, and requires high quality operation and management personnel. If manual operation is used, there will be cumbersome operations due to the water inlet and outlet

[0018] The combination of various physicochemical and biochemical processes mentioned above has its own characteristics, but each individual physicochemical method and biochemical method has its own defects and deficiencies, resulting in unstable pretreatment and impact on subsequent biochemical processes. Incomplete treatment of macromolecular and refractory organic substances is powerless, resulting in the problem that glyphosate wastewater cannot meet the discharge standards after treatment