Development of New Pulping Process for Agricultural Wastes and Annual Plants to Use Waste Liquor as Fertilizer

由于秸秆的壁聚合物是由羟基肉桂酸通过醚和酯桥结合而成的，因此极易被氨修饰。然后选择NH_3水溶液作为制浆液，开发稻秆制浆新体系。常规NaOH制浆废液中含有大量来源于草中二氧化硅的NaSiO_2、木质素、碳水化合物和NaOH。废液的处理确实很困难。新制浆工艺采用NH_3，废液中含有NH_3、木质素和碳水化合物。当少量KOH与NH_3混合作为制浆液促进制浆时，废液中应含有钾，并具有足够的造纸用纸浆性能。废液作为玉米和水稻的肥料施用。废液的应用对植物的生长有很大的促进作用。

Rice straw would be easily modified by ammonia because wall polymers are associated by hydroxycinnamic acids through ether and ester bridges. Then aqueous NH_3 solution was selected as pulping liquor to develop new pulping system of rice straw. Waste liquor from conventional pulping of grasses using NaOH contains significant amount of NaSiO_2 originated from silica in grasses together with lignin, carbohydrates and NaOH. It is really difficult to treat waste liquor. New pulping process uses NH_3, waste liquor contains NH_3 together with lignin and carbohydrates. When small amount of KOH were used together with NH_3 as pulping liquor to promote pulping, the waste liquor should contain potassium, and enough properties of pulp for paper making. The waste liquor was applied as a fertilizer for maize and rice cultivations. Growth of plants was considerably promoted by the application of the waste liquor.