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Study on Pre-treatment of N-PHenylglycinonitrile Production Wastewater

Author: ChenLin
Tutor: LongTengRui
School: Chongqing University
Course: Municipal Engineering
Keywords: Organobentonite Adsorption Iron crosslinked bentonite Oxidation Aniline -acetonitrile production wastewater
CLC: X783
Type: Master's thesis
Year: 2008
Downloads: 99
Quote: 3
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Abstract

Aniline-acetonitrile chemical wastewater a high concentration BIOREFRACTORY the degradation of toxic wastewater; Its main ingredient is the Aniline and cyanide toxicity, endangering. This study focuses on the pretreatment before biological wastewater treatment pilot study. Bentonite is montmorillonite as a main component a hydrous aluminum silicate clay mineral, since it has the special physical and chemical properties, after organic modification or heavy metal modified bentonite for wastewater having a better treatment effect in the containing organic pollutants, heavy metal wastewater treatment, modified bentonite is a highly efficient adsorbent. Therefore, the application of modified bentonite products in wastewater treatment by the majority of the attention and development of the environmental protection workers. This study, as the raw material to the original bentonite mine Na bentonite prepared by microwave irradiation, after purification, sodium conditions: NaCl Na modifier modifier dosage bentonite dosage ratio of 0.6:5 ??(g / g), the amount of solvent used, and bentonite dosing ratio of 7:5 (ml / g), the reaction time for 4min, and the results showed that, to a cation exchange capacity of sodium bentonite of the preparation obtained from 62.4 mmol / 100g the soil to 93mmol/100g soil conducive to the follow-up of organic modification and iron crosslinked pillared modified. Secondly, anilino the acetonitrile workshop wastewater pollutants to CTMAB modified cationic surfactant sodium bentonite as raw material, to prepare for organic bentonite and investigated during the test the organic bentonite appropriate preparation conditions as well as the organobentonite In addition to performance. The test results showed that the organic bentonite Suitable conditions for the preparation: The amount of the organic modifier 90CEC, microwave irradiation time using 2min, the amount of solvent used, and bentonite dosing ratio of 6:1 (ml / g); organic bentonite processing anilino acetonitrile workshop wastewater optimized process conditions: organic bentonite dosage of 20g / L, pH 6.0 processing system, adsorption temperature of 30 ° C, the adsorption time of 60 min, the treatment effect: CODcr and aniline removal rates reached 23.3% and 54.4% respectively, can be biochemical BOD5/CODcr can improve to about 0.11, and the organic bentonite adsorption of organic pollutants in waste water meets Linear adsorption isotherm model and pseudo-second-order kinetic model, while the use of the original soil mineral processing anilino acetonitrile production of wastewater, of CODcr and the aniline removal rate reached only 3.4% and 8%, respectively, the biodegradability BOD5/CODcr difficult to detect, organic bentonite adsorption capacity has greatly improved, but due to the high concentration of aniline-acetonitrile production wastewater virulent organic bentonite this wastewater processing capacity is limited, the removal rate is not high, it is difficult to meet subsequent biochemical treatment requirements. Therefore, this study attempts to iron-cross-linked bentonite with H2O2 oxidation processing aniline-acetonitrile wastewater and to examine pollutant removal performance. The test results show that the relative adsorption of organic bentonite, the iron crosslinked bentonite-H2O2 oxidation of wastewater treatment capacity greatly improve-H2O2 oxidation of iron crosslinked bentonite adsorption processing of aniline ylacetonitrile wastewater than optimum process conditions for the wastewater pH value of 4.0, hydrogen peroxide dosage of 6.66g / L, crosslinked bentonite dosage of 20g / L, treatment temperature is 30 ℃, treatment time was 60 min, with organobentonites aniline-acetonitrile workshop production wastewater treatment effect compared, the iron crosslinked bentonite H2O2 oxidation treatment, CODcr and aniline removal rates of 40.6% and 92.6%, aniline content of less than 500 mg / L, the biodegradability BOD5/CODcr improve to about 0.32, can basically meet the requirements of the subsequent biochemical treatment influent, paper-H2O2 oxidation of the iron-cross-linked at the same time deal with aniline-acetonitrile wastewater kinetic studies. In addition, in the process of preparation of modified bentonite, this study using X-ray diffraction, infrared spectroscopy, scanning electron microscope study of sodium bentonite, organic bentonite and iron crosslinked bentonite structural changes, through organic or iron cross-linking, the the bentonite interlayer spacing is greater than sodium bentonite; infrared spectroscopy, the organic bentonite as well as iron crosslinked bentonite new peaks, scanning electron microscopy analysis results further illustrate the bentonite modified after its surface packing modified group makes to improve the performance of modified bentonite processing wastewater the bentonite modified after the changes in the structure and nature is conducive to dealing with aniline-acetonitrile production wastewater. Finally, purified bentonite, organic bentonite, iron cross-linked bentonite-H2O2 activated carbon treatment aniline-acetonitrile wastewater treatment effect compared to determine the better method, which uses iron-cross the associated bentonite H2O2 United oxidation treatment aniline-acetonitrile wastewater , and through the sludge activity Determination of the acid production segments to determine their requirements pretreatment section effluent optimum pH range of 6.0 to 6.5.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Chemical industry,waste disposal and comprehensive utilization > Organic Chemistry Industry
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