KINETIKA DESORPSI UREA DARI KARBON BERPORI TEROKSIDASI ASAM SULFAT SEBAGAI SLOW RELEASE FERTILIZER

Theresia Evila, Shafwan Amrullah
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Abstract

Urea is an important nitrogen source for plant but the price of urea fertilizer is relatively high. Urea uptake from urea manufacture waste water and its application as fertilizer is of high interest. The purpose of this study is to find out desorption ability of urea adsorbed porous carbon to be applied as fertilizer. Theoritically, urea released from  porous carbon to environment has slower rate of mass transfer compare to conventional urea fertilizer because urea molecules in porous carbon has to pass through pores of carbon during its movement out of carbon. The porous carbon as adsorbent was made from coconut shell by pyrolysis, followed by sulfuric acid oxidation treatment  Oxidation treatment carried out to extent adsorption capacity as well as to give additional sulfur nutrient when applied as fertilizer. Oxidation of carbon surface was performed using sulfuric acid (50%w) to soak porous carbon followed by heating at 90oC temperature for 2 hours. Desorption was conducted by placing porous carbon into beaker contain water and the raising of urea concentration in water recorded after 3,5,10, 30, and 60 minutes. Results reveal that the value of mass transfer coefficient (kc) and effective diffusivity (De) of urea desorption from porous carbon are 0,0293 – 0,0743 cm/s and 8 x 10-10 – 5 x 10-9 cm2/s with initial concentration of urea 1000, 2000, and 4000 mg/L. Release rate of urea from porous carbon and urea prill are 0,07 ppm/s  and 1,23 ppm/s. Slower release rate of urea off  porous carbon than urea prill shows the promising of urea recovery using porous carbon as slow release fertilizer.
硫酸氧化的多孔碳解动力学分解作为缓慢释放FERTILIZER
尿素是植物重要的氮源,但尿素肥料价格较高。从尿素生产废水中吸收尿素及其作为肥料的应用备受关注。本研究的目的是了解尿素吸附多孔碳作为肥料的解吸能力。从理论上讲,从多孔碳中释放到环境中的尿素比传统的尿素肥传质速度慢,这是因为多孔碳中的尿素分子在脱离碳的过程中必须穿过碳的孔隙。以椰壳为原料,通过热解法制备多孔碳作为吸附剂,然后进行硫酸氧化处理,以扩大吸附能力,并在施肥时给予额外的硫养分。采用50%w的硫酸浸泡多孔碳,90℃加热2小时,对多孔碳表面进行氧化。将多孔碳放入盛有水的烧杯中进行解吸,记录3、5、10、30、60分钟后水中尿素浓度的升高情况。结果表明,在初始尿素浓度为1000、2000和4000 mg/L时,多孔炭解吸尿素的传质系数(kc)和有效扩散系数(De)分别为0.0293 ~ 0.0743 cm/s和8 × 10-10 ~ 5 × 10-9 cm2/s。多孔炭和尿素颗粒的尿素释放速率分别为0.07 ppm/s和1.23 ppm/s。多孔碳对尿素的释放速度比尿素颗粒慢,表明多孔碳作为缓释肥料回收尿素具有广阔的前景。
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