盐度对熟化发酵污泥再发酵产酸及脱水性的影响

为了了解熟化发酵污泥的性能及挖掘其剩余有机碳源和能源，向熟化发酵污泥中投加NaCl与NaOH对熟化发酵污泥再发酵。通过投加0g/L、5g/L、15g/L、20g/LNaCl，分别考察不同盐度对熟化发酵污泥再发酵性、内碳源再提取情况及脱水性的影响。结果表明：在发酵初期，5g/L、15g/L及20g/LNaCl试验组与0g/LNaCl试验组相比均可以促进熟化发酵污泥EPS释放且生成挥发性脂肪酸，其中熟化发酵污泥再发酵与原熟化发酵污泥相比水解率可提高36%，酸化率可提高34%，氨化率可提高40%。发酵后期5g/L试验组与0g/L、15g/L及20g/LNaCl试验组相比加速EPS和可挥发性脂肪酸分解，同时发现，NH4-N含量随着盐度提高而增加，PO43--P含量随着盐度浓度的增大而降低。熟化发酵污泥再发酵后5g/LNaCl条件下可改善发酵污泥脱水性，15g/L及20g/L条件下恶化了发酵污泥脱水性。

Effect of Salinity on the Slaking Fermentation Sludge Fermenting Again Produce Acid and Hehydration Property

In order to research the performance and excavate the organic carbon and energy source of the slaking fermentation sludge, made the slaking fermentative sludge second fermentation by adding the NaCl and NaOH into the fermentation sludge. Through added 0g/L, 5g/L, 15g/L,20g/LNaCl, investigated the effect of different salinity on the fermentation performance, the extracting situation of carbon source and dewatering performance of slaking fermentation sludge respectively. The results showed that 5g/L, 15g/L and 20g/L NaCl tests could promote the protein release and produce the volatile fatty acids which compared with 0g/L NaCl test in the early stage of fermentation, the maximum hydrolysis rate was 36%, acidification rate was 34%, ammonification was 40% compare with the original slaking sludge fermentation. In the late fermentation, 5g/L NaCl test accelerated the protein and volatile fatty acids using compared with 0g/L,15g/L and 20g/L NaCl tests. The results also showed that NH4-N concentration increased and PO43--P decreased with the salnity rise. 5g/L NaCl test could improve the fermentation sludge dehydration property, but 15g/L and 20g/LNaCl test deteriorated the fermentation sludge dehydration property.