木质素磺酸钠对市政污泥好氧发酵过程磷形态转化的影响

Effect of Sodium Lignosulfonate on the Transformation of Phosphorus Forms during Aerobic Fermentation of Municipal Sludge

关键词:  市政污泥  好氧发酵  木质素磺酸钠  腐殖质  磷形态

Key words:  municipal sludge  aerobic fermentation  lignosulfonate sodium  humus  phosphorus form

摘要:

针对传统市政污泥好氧发酵过程难溶性磷酸盐向有效磷转化效率低的问题，本研究依次添加物料总质量0%、5%、10%、15%的木质素磺酸钠(SLS，分别记为CK、S5、S10、S15)，探究其对市政污泥好氧发酵过程磷形态转化的影响及作用机制。结果表明：添加SLS优化了堆体理化性质，促进胡敏素(HU)向胡敏酸(HA)和富里酸(FA)转化；同时SLS可以有效提高堆体的速效磷(Olsen-P)含量，Hedley磷分级结果显示，S5、S10、S15处理组有效磷(AP)和中等可用磷(MAP)在总磷中所占比例分别为58.48%、54.36%、49.35%，远高于CK处理组(32.15%)；相关性分析表明，含水率(MC)、电导率(EC)、有机质(OM)、腐殖质(HS)、FA、碳氮比(C/N)、HA是影响Olsen-P累积的主要因素，与水溶性磷(H₂O-P)呈正相关并按照相关性强弱排序依次为C/N、EC、FA。综上，在市政污泥好氧发酵中添加SLS可提高堆体的磷素有效性，磷形态转化主要是通过SLS自身官能团的螯合能力以及提高堆体腐殖化程度实现。

Abstract:

Aiming at the problem of low conversion efficiency of insoluble phosphate to available phosphorus in traditional municipal sludge aerobic fermentation process,Sodium Lignin Sulfonate (SLS,denoted as CK,S5,S10 and S15,respectively) with total material mass of 0%,5%,10% and 15% was added in turn to explore its effect and mechanism on phosphorus speciation transformation in municipal sludge aerobic fermentation process.The results showed that the addition of SLS optimized the physical and chemical properties of the pile and promoted the conversion of Humin (HU) to Humic Acid (HA) and Fulvic Acid (FA).At the same time,SLS could effectively improve the content of Olsen-P in the pile.The results of Hedley phosphorus classification showed that the proportion of Available Phosphorus (AP) and Medium Available Phosphorus (MAP) in total phosphorus in S5,S10 and S15 treatment groups was 58.48%,54.36% and 49.35%,respectively,which was much higher than that in CK treatment group (32.15%).The correlation analysis showed that Moisture Content (MC),Electrical Conductivity (EC),Organic Matter (OM),Humus (HS),FA,Carbon to Nitrogen ratio (C/N) and HA were the main factors affecting the accumulation of Olsen-P,which were positively correlated with water-soluble phosphorus(H₂O-P)and sorted by correlation strength as C/N,EC and FA.In summary,the addition of SLS in the aerobic fermentation of municipal sludge can improve the phosphorus availability of the pile.The transformation of phosphorus forms is mainly achieved by the chelating ability of SLS's own functional groups and the improvement of the humification degree of the pile.