电子束辐照结合低温热水解协同提高污泥破解率

以城市污水处理厂脱水污泥为供试材料，通过比较电子束辐照、热水解及组合工艺对污泥破解率的影响发现：随着热水解温度从90 ℃提高到120、140和160 ℃，污泥破解率分别从14.82%升高至19.97%、23.16%和33.28%。当热水解温度低于140 ℃时，氨氮/溶解性总氮的比值（NH3-N/TSN）在0.14~0.17之间波动，而温度达160 ℃时，NH3-N/TSN升高至0.22。另一方面，当污泥吸收剂量由5 kGy增加至10、15、20 kGy时，污泥破解率分别由3.77%缓慢上升到4.87%、5.01%、5.42%。但是，NH3-N/TSN维持在0.32~0.33之间，比热水解处理约提高1倍。在组合工艺中，15 kGy+90 ℃热水解30 min污泥破解率最高，达25.1%，NH3-N/TSN≈0.22。实验证明：热水解对污泥破解效果显著，但电子束辐照可进一步将大分子有机物质降解为小分子物质。

Improvement of sludge disintegration by electron beam radiation in combination with low temperature thermal treatment

The effects of thermal hydrolysis (TH), electron beam (EB) radiation, and combined process of EB-TH on sludge disintegration were investigated. It indicated that sludge disintegrations were improved with the increasing TH temperature from 90 to 120, 140, 160℃. The sludge solubilization were achieved from 14.82% to 19.97%, 23.16% and 33.28%, respectively. Another key data of NH3-N/TSN ranged between 0.14 and 0.17 when TH temperature was below 140℃. However, this ratio increased up to 0.22 when TH operated at 160℃. On the other side, the sludge solubilization were 3.77%, 4.87%, 5.01% and 5.42% when absorbed dose increased from 5 to 10,15,20 kGy, respectively. The ratio of NH3-N/TSN ranged from 0.32 to 0.33, which were almost double times higher than that treated with thermal hydrolysis. The most promising result was obtained by EB radiation (15 kGy) in combination with thermal treatment (90℃/30 min). The sludge solubilization and NH3-N/TSN were 25.1% and 0.22, respectively. The results demonstrated that thermal hydrolysis was far more effective in sludge disintegration while electron beam radiation was better in degradation of high molecule organic compounds into lower molecule compounds.