This study deals with valorization of the protein-rich fish and poultry waste. Since fish scales and chicken feathers are hard-to-degrade by the scavenger microbes, they were hydrolyzed into a source material for construction of rechargeable protein batteries. Both wastes were dissolved in sodium hydroxide (NaOH) solution to form oxidizing and reducing halves of the battery. NaOH not only worked as a hydrolyzing agent but electrolyte for battery as well. Different parameters including NaOH concentration, salt bridge, charge storage capacity, charging time and quantity of the waste were optimized to get maximum output from the protein battery. The optimum concentration of NaOH was measured about 0.75 M. The waved-thread wick was found the best salt bridge and maximum charger power was obtained at 24 V with 10 min of charging time. The scale to feather ratio of 4:5 was found best condition for construction of protein battery with stable output. The constructed battery was found effective in both open and closed circuits. Light emitting diodes were used as a load for the closed circuit.

中文翻译：

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鱼鳞与鸡羽毛混合废料制备可充电蛋白电池

该研究涉及富含蛋白质的鱼和家禽废物的增值。由于鱼鳞和鸡羽毛很难被清除微生物降解，因此它们被水解成可充电蛋白质电池的原材料。将两种废料都溶解在氢氧化钠（NaOH）溶液中，以形成电池的氧化半还原部分。NaOH不仅用作水解剂，而且还用作电池的电解质。优化了包括NaOH浓度，盐桥，电荷存储容量，充电时间和废物量在内的不同参数，以从蛋白质电池获得最大输出。NaOH的最佳浓度约为0.75M。发现波浪形灯芯具有最佳的盐桥，在24 V电压下充电10分钟可获得最大充电器功率。鳞羽比为4：5被认为是构建稳定产量的蛋白质电池的最佳条件。发现构造的电池在开路和闭路中均有效。发光二极管用作闭合电路的负载。