生物酶调理对造纸污泥脱水性能的影响

Effect of Biological Enzyme Conditioning on Dewatering Performance of Paper Mill Sludge

污泥调理是实现污泥深度脱水的前提,生物酶调理因可生物降解、无二次污染等显著优势而备受关注。本实验中,以比阻(SRF)、泥饼含水率和上清液COD_(Cr)(以下简称COD)作为评价污泥脱水性能的指标,考察了纤维素酶、蛋白酶和脂肪酶单独调理对造纸污泥脱水性能的影响,并进一步研究了纤维素酶和蛋白酶复配调理对污泥脱水性能的影响。实验结果表明:生物酶单独调理时,纤维素酶的调理效果优于蛋白酶,两者调理效果均优于脂肪酶。当纤维素酶和蛋白酶复配使用时可进一步增强污泥调理效果,其中纤维素酶用量为20mg/L、蛋白酶用量为10mg/L时效果最佳,其SRF降至2.94×10^(12)m/kg,含水率降至71.5%,与原污泥相比分别降低72.0%和27.5%;与单独使用纤维素酶(30mg/L)达到最佳效果时相比分别降低8.5%和1.7%;比使用蛋白酶(20mg/)单一调理效果最佳时分别降低29.0%和7.6%。

Sludge conditioning is the premise to realize deeply dewatering. Biological enzyme conditioning, which has the characteristic of biodegradation and no secondary pollution, receives more and more attention. It was inves- tigated that the effects of cellulase, protease and lipase on the dewatering performance of paper mill sludge, inclu- ding specific resistance to filtration（ SRF）, water content of cake and supernatant CODc^（ hereinafter referred to as the COD）. The results showed that the effect of cellulase was better than that of protease, both of them were better than that of lipase when they acted alone, respectively. When cellulase was combined with protease, it can further enhance the effect of sludge conditioning. When the dosage of cellulase was 20rag / L and the dosage of protease was 10mg / L, the effect of sludge conditioning was the best, while the SRF dropped to 2.94 x 1012m/kg and the moisture content dropped to 71.5%, compared with the original sludge reduced 72. 0% and 27.5% ,respectively; compared with the best conditioning effect when cellulase was used alone （30mg/L） , they reduced by 8.5% and 1.7% ,respectively; compared with the best conditioning effect when protease was used alone （20mg / L）, they reduced by 29.0% and 7.6% ,respectively.