椰壳颗粒活性炭活化过硫酸钠预处理促进高固污泥水解产酸性能  

Coconut shell granular carbon activated sodium persulfate pretreatment elevates the performance of hydrolysis and acid production from high-solid sludge digestion

作　　者：马晶伟[1] 杨扬[1] 徐鹏[1] 贺维鹏[1] 柯水洲[1] MA Jingwei;YANG Yang;XU Peng;HE Weipeng;KE Shuizhou(School of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《环境工程学报》2022年第6期1892-1899,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(52070076)。

摘　　要：为探究椰壳颗粒活性炭活化过硫酸钠(PS)预处理对高固污泥厌氧发酵水解产酸性能的影响,通过调节挥发性脂肪酸(VFAs)产量、溶解性化学需氧量(SCOD)、溶解性蛋白质及多糖等指标,探究了不同剂量颗粒活性炭(GAC)与PS预处理对高固污泥产酸发酵的最佳条件。结果表明,当PS和GAC投加量分别为1.50 mmol·g^(-1)(以总固体计)和0.65 g g^(-1)(以总固体计)时,在发酵前期产酸速率相比于对照组提高了341.43%,后续发酵过程中,VFAs最大产量相比于对照组提高了28.43%。其中,乙酸作为优质碳源,其质量浓度增加了48.98%;继续增加GAC剂量时,反应器厌氧发酵性能下降,其原因可能是过量GAC会消耗已生成的SO_(4)^(-)·,降低污泥水解作用,同时GAC表面对VFAs的吸附也导致产酸量下降。三维荧光分析表明,在产酸量较高的反应器中,氨基酸、芳香族蛋白质等溶解性有机物的质量浓度较低,这说明适量椰壳颗粒活性炭活化PS预处理方式可提高高固厌氧发酵中微生物对于水解底物的利用率,从而提高污泥的厌氧产酸性能。本研究结果可为炭活化PS预处理技术在高固污泥厌氧消化中的应用提供参考。To analyze the effect of coconut shell granular activated carbon activated sodium persulfate(PS)pretreatment on the performance of anaerobic fermentation and hydrolysis of high-solid sludge for acid production,the optimal conditions with different doses of granular activated carbon(GAC) and PS were explored by the yield of volatile fatty acids(VFAs),soluble chemical oxygen demand(SCOD),soluble protein and polysaccharide.When the dosage of PS and GAC were 1.50 mmol·g^(-1)(based on the total solids) and 0.65g·g^(-1)(based on the total solids),respectively,the acid production rate in the early fermentation stage increased by 341.43%.With the progress of fermentation,the maximum production of VFAs increased by 28.43% and the acetic acid as the high-quality carbon source increased by 48.98% compared with the control group.Increasing the dosage of GAC would lead to the decline of anaerobic fermentation performance of the reactor,which might be due to the consumption of the generated SO_(4)^(-)· by excessive GAC in the pretreatment process,resulting in the reduction of hydrolysates,and the adsorption of VFAs on the surface of GAC leads to the decrease of acid production simultaneously.Three-dimensional fluorescence analysis showed that the concentrations of soluble substances,such as amino acids and aromatic proteins,were relatively low in the reactor with high acid production,indicating that appropriate amount of coconut shell granular carbon activated PS pretreatment could improve the utilization rate of hydrolyzed substrates,and improve the anaerobic digestion performance of sludge.The results can provide a theoretical reference for the application of carbon-activated PS pretreatment technology in anaerobic digestion of high-solid sludge.

关 键 词：高固污泥 炭活化过硫酸钠 厌氧消化 水解产酸 三维荧光分析 

分 类 号：X705[环境科学与工程—环境工程]