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首页> 外文会议>2009 ISEST;International symposium on environmental science and technology >New Utilization Technology: Producing Compound Amino Acids from Sewage Sludge by Acid Hydrolysis
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New Utilization Technology: Producing Compound Amino Acids from Sewage Sludge by Acid Hydrolysis

机译：新的利用技术：通过酸水解从污泥中生产复合氨基酸

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摘要

In this study, a new and effective utilization technology for waste activated sludge (WAS) has been employed to produce compound amino acids. The process was achieved by two-step hydrochloric acid (HCl) hydrolysis of sewage sludge (SS). Firstly, the SS was hydrolyzed for proteins by HCl under high temperature and pressure in self-made hydrolysis reactor. And the effects of the hydrolytic temperature, time and pH on the extraction ratio of proteins were investigated in detail. The results show that the best extraction efficiency of proteins is obtained at a pH= 0.5, T=121 °C and a reaction time of 5 h, under which condition, the protein extraction ratio is the highest of 78.5% (38.2% of initial dry WAS weight), and the DS weight reduces about 45.4%. Then the sludge proteins were hydrolyzed for compound amino acids by HCl and the compound amino acids produced were extracted by ion-exchange resin method. Major technological parameters such as the HCl loading, hydrolytic time and temperature on the hydrolysis efficiency were investigated in detail. And the optimum condition for protein hydrolysis was as follows: T=110-120 °C, hydrolytic time=10 h, hydrochloric acid (mL) /dry WAS (g) ratio is 8:1. Under this condition, the amino acids yield were 10.7-12.2 [(g amino acids)/(100 g WAS)] and the extraction ratio of amino acid was high to 80.9%. This novel utilization technology of WAS is environmentally friendly and economically feasible, which can provide an abundant resource of amino acids.
机译：在这项研究中，一种新的有效利用废物活性污泥（WAS）的技术已被用于生产复合氨基酸。该过程是通过污水污泥（SS）的两步盐酸（HCl）水解而实现的。首先，在自制的水解反应器中，在高温和高压下用盐酸将SS水解为蛋白质。并详细研究了水解温度，时间和pH值对蛋白质提取率的影响。结果表明，在pH = 0.5，T = 121°C，反应时间为5 h的条件下，蛋白质的提取率最高，在此条件下，蛋白质的提取率最高，为78.5％（初始值的38.2％）。 WAS重量），DS重量减少约45.4％。然后将污泥蛋白用HCl水解成复合氨基酸，并用离子交换树脂法提取生成的复合氨基酸。详细研究了HCl的负载量，水解时间和温度等主要工艺参数对水解效率的影响。蛋白质水解的最佳条件如下：T = 110-120℃，水解时间= 10h，盐酸（mL）/干WAS（g）比为8：1。在此条件下，氨基酸收率为10.7-12.2 [（g氨基酸）/（100g WAS）]，氨基酸提取率高达80.9％。 WAS的这种新的利用技术既环保又经济可行，可以提供丰富的氨基酸资源。

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