碱水解法处理脱水污泥的有机物溶出特性

碱水解法是一种有效的脱水污泥减量化方法,但碱水解法处理脱水污泥过程中产生的高浓度有机物溶液性质尚不明确。试验研究了脱水污泥在不同碱浓度处理下所得碱提取液中化学需氧量(TCOD)和溶解性化学需氧量(SCOD)、蛋白质、多糖、核酸的含量,明确了碱提取液中有机物组成,为实现碱水解液的综合利用,消除碱水解法用于污泥减量化过程中的二次污染提供了理论依据。研究结果表明,在碱处理浓度介于0.1¹ mol/L的条件下,提取物中SCOD浓度可达4 196.45 mg/L、SCOD/TCOD为90%、蛋白质浓度可达448.43 mg/L、多糖浓度为92.96 mg/L、核酸浓度为35.91 mg/L,且各指标整体碱浓度增大而增大。碱处理过程中脱水污泥中有机物发生了显著的溶解,污泥中的细菌被水解破碎。碱提取液具有将其作为生物处理设施外加碳源、动物饲料等潜在的利用价值。

Characteristics of Dissolved Organics from Dewatered Sludge Treated by Alkali Hydrolysis

Alkali hydrolysis is an effective sludge reduction method.The composition and the concentrations of organics,such as TCOD,SCOD,protein,polysaccharide,nucleic acid in alkali extract of dewatered sludge were investigated in order to avoid the probable second pollution problem and make it utilizable.Results showed that the concentration of SCOD after alkali hydrolysis treatment reached 4 196.45 mg/L under the condition of alkali concentration increased from 0.1mol/L to 1mol/L,and SCOD/TCOD ratio increased to 90%,the concentration of protein,polysaccharide,nucleic acid under the same circumstance reached 448.43 mg/L,92.96 mg/L,35.91 mg/L respectively.It indicates that the concentration of organics increased with the increase of NaOH concentration for dewatered sludge treatment.The organics of dewatered sludge dissolved obviously during alkali hydrolysis process,in which bacteria in sludge was disrupted by hydrolysis.Biological treatment facility and recovery of carbon source and the preparation of animal feeds from extract by alkali hydrolysis was investigated.