Changxiu Gong1, Jianguo Jiang2, De'an Li1. 1. School of Environment, Tsinghua University, Beijing 100084, China. 2. School of Environment, Tsinghua University, Beijing 100084, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, China; Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing, China. Electronic address: jianguoj@mail.tsinghua.edu.cn.
Abstract
We focused on the effects of ultrasound and Fenton reagent in ultrasonic coupling Fenton oxidation (U + F) pre-treatment processes on the disintegration of wastewater treatment plant sludge. The results demonstrated that U + F treatment could significantly increase soluble COD, TOC, total N, proteins, total P and PO4(3-) concentrations in sludge supernatant. This method was more effective than ultrasonic (U) or Fenton oxidation (F) treatment alone. U + F treatment increased the soluble COD by 2.1- and 1.4-fold compared with U and F alone, respectively. U + F treatment increased the total N and P by 1.7- and 2.2-fold, respectively, compared with F alone. After U + F treatment, sludge showed a considerably finer particle size and looser microstructure based on scanning electron microscopy, and the highest OH signal intensity increased from 568.7 by F treatment to 1106.3 using electron spin resonance. This demonstrated that U+F treatment induces disintegration of sludge and release of organic carbon, nitrogen and phosphorus better.
We focused on the effects of ultrasound and Fenton reagent in ultrasonic coupling Fenton oxidation (U + F) pre-treatment processes on the disintegration of wastewater treatment plant sludge. The results demonstrated that U + F treatment could significantly increase soluble COD, TOC, total N, proteins, total P and n class="Chemical">PO4(3-) concentrations inpan> sludge supernatant. This method was more effective than ultrasonic (U) or Fenton oxidation (F) treatment alone. U + F treatment inpan>creased the soluble COD by 2.1- and 1.4-fold compared with U and F alone, respectively. U + F treatment inpan>creased the total N and P by 1.7- and 2.2-fold, respectively, compared with F alone. After U + F treatment, sludge showed a considerably finpan>er particle size and looser microstructure based on scanninpan>g electron microscopy, and the highest OH signal inpan>tensity inpan>creased from 568.7 by F treatment to 1106.3 usinpan>g electron spinpan> resonance. This demonstrated that U+F treatment inpan>duces disinpan>tegration of sludge and release of organic n class="Chemical">carbon, nitrogen and phosphorus better.