高温热水解对高含固污泥中磷的形态转化影响

通过正交实验、单因素温度影响实验，利用SMT磷分级提取法研究了高温热水解后高含固污泥中磷的形态转化.结果表明，120℃~160℃的高温热水解可以将高含固污泥中14.80%以上的有机磷转化为无机磷，影响因素对无机磷/总磷的影响大小顺序为：热水解温度 > 热水解时间 > 氧化剂含量 > pH值，随着温度的升高，高含固污泥中无机磷/总磷也从79.13%增加至95.87%；当热水解温度为160℃、时间为40min时，高含固污泥中无机磷含量由原泥的18.30mg/g增至20.49mg/g，无机磷/总磷由80.83%增至96.97%.结果为实现污泥中磷的回收利用奠定基础，同时为“高温热水解+高含固厌氧消化”工艺的优化提供新思路.

Effects of high temperature thermal hydrolysis process on changes of phosphorus forms in high-solid sewage sludge

Orthogonal experiment, single factor experiment (i.e. temperature), and standards, measurements, and testing (SMT) were used to explore changes of phosphorus forms in high-solid sewage sludge after high temperature thermal hydrolysis process (HTTHP). The experimental results showed that more than 14.80% of organic phosphorus (OP) was transformed into inorganic phosphorus (IP) in high-solid sewage sludge by the HTTHP at 120℃~160℃, and the order of influencing factors on IP/total phosphorus (TP) was as follows:temperature of HTTHP > time of HTTHP > oxidant content > pH. With the increase of temperature, IP/TP in high-solid sewage sludge increased from 79.13% to 95.87%. Further study indicated that under 160℃ and 40min of HTTHP conditions, the IP and the IP/TP increased respectively from 18.30mg/g to 20.49mg/g and 80.83% to 96.97%. These findings, however, established foundation to realize the phosphorus recovery, and also provided an important reference for the optimization of high-solid anaerobic digestion of sewage sludge with HTTHP pretreatment.