Change and mechanism of sludge dewaterability during alkaline fermentation

ZHU Jianping; PENG Yongzhen; LI Xiaoling; SU Gaoqiang; WANG Shuying

doi:10.3969/j.issn.0438-1157.2013.11.044

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Change and mechanism of sludge dewaterability during alkaline fermentation

更新时间：2025-12-10

- Change and mechanism of sludge dewaterability during alkaline fermentation
- CIESC Journal Issue 11, Pages: 4210-4215(2013)
- 作者机构：
  
  1. 哈尔滨工业大学城市水资源与水环境国家重点实验室,黑龙江,哈尔滨,150090
  2. 北京工业大学北京市水质科学与水环境恢复工程重点实验室,北京,100022
- 作者简介：
- 基金信息：
  
  supported by the National Natural Science Foundation of China(51178007).
- DOI：10.3969/j.issn.0438-1157.2013.11.044
  CLC： 703
- Online First：05 November 2013，
  
  Published：05 November 2013
- 稿件说明：
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ZHU Jianping, PENG Yongzhen, LI Xiaoling, et al. Change and mechanism of sludge dewaterability during alkaline fermentation[J]. CIESC Journal, 2013, (11): 4210-4215.
DOI：

ZHU Jianping, PENG Yongzhen, LI Xiaoling, et al. Change and mechanism of sludge dewaterability during alkaline fermentation[J]. CIESC Journal, 2013, (11): 4210-4215. DOI： 10.3969/j.issn.0438-1157.2013.11.044.

摘要

通过控制温度在25℃和35℃

利用Ca(OH)2和NaOH调节碱性发酵过程中pH至10

研究了碱性产酸发酵过程中碱性发酵液脱水性能的变化

并且分析了影响碱性发酵液脱水性能的因素。研究发现NaOH条件下得到的发酵污泥的脱水性能比Ca(OH)2条件下得到的发酵污泥的脱水性能差

同种碱试剂条件下

35℃条件下的发酵污泥脱水性能比25℃条件下差。通过对溶解的蛋白和多糖含量的分析

得出在一定范围内

两者的含量与标准化CST(毛细吸水时间)存在较好的线性关系

并且单位多糖比单位蛋白更能引起发酵污泥脱水性能的恶化。通过对溶解的蛋白多糖结合Zeta电位、平均粒径分析

得出温度和Ca2+可能是引起碱性发酵污泥脱水性能差异的根本原因

Ca2+能中和胶体表面较多的负电荷

在污泥絮体之间起到良好的吸附架桥作用

从而不利于污泥的水解

抑制有机物的溶出

而有利于污泥的脱水。从脱水成本和产酸量综合分析

Ca(OH)2比NaOH更适合作为碱试剂调节pH

25℃条件下更适合作为碱性发酵的温度。

Abstract

Change of sludge dewaterability during alkaline fermentation was investigated by controlling temperature at 25℃ and 35℃ and using Ca(OH)2 and NaOH to adjust the pH of reactor.The factors influencing dewaterability of alkline fermentation sludge were analyzed.Alkaline fermentation sludge with pH adjusted by NaOH had poorer dewaterability than that with pH adjusted by Ca(OH)2.Dewaterability of the sludge fermented at 35℃ was worse than the sludge fermented at 25℃ using the same alkaline fermentation.The CST(capillary suction time)correlated with the soluble proteins concentration in alkaline fermentation sludge within a certain range and the change of soluble carbohydrates concentration had a more remarkable influence on the CST than proteins.The analysis combining Zeta potential

particle size with soluble carbohydrates and proteins indicated that temperature and concentration of Ca2+ may be the cause for dewaterability difference of the sludge using different alkaline reagents.Ca2+ could neutralize more negative charge and act as a better bridging agent between flocs

which may inhibit sludge hydrolysis and dissolution of organics

but improve dewaterability of the sludge.From the angle of dewatering cost and SCFAs(short chain fatty acids)products

Ca(OH)2 is a better alkaline reagent than NaOH to adjust the pH of sludge during alkaline fermentation.

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