摘要
以城市污水处理厂高含固污泥为对象,分别进行了连续厌氧消化抑硫试验和消化污泥Fe(Ⅲ)投加抑硫试验,探讨不同Fe/S(摩尔比)对污泥厌氧消化中溶解态硫化物去除效率的影响以及Fe(Ⅲ)与pH的交互作用.结果表明,热水解污泥厌氧消化采用原位抑硫技术,在Fe/S(摩尔比)为7.75时沼气中H_2S含量可由170.4×10^(-6)降至14.09×10^(-6),无需进行后续处理;当pH为7.00~7.50、Fe/S为1~11时,pH为原位抑硫主要显著影响因子,提高消化池pH有利于降低Fe(Ⅲ)投加量;高含固污泥厌氧消化沼气满足H_2S利用标准时,所需最低Fe/S为7.0;当消化池pH低于7.30时,将无法通过调节Fe/S实现H_2S浓度达标排放.
To evaluate the influence of Fe/S ratio and pH on sulfide removal efficiency and interactions between Fe/S and pH,anaerobic hydrogen sulfide in situ depression tests and digested sludge liquor sulfide removal tests were carried out by using dewatering sludge from a wastewater treatment plant（WWTP）.Results showed that the concentration of hydrogen sulfide in biogas from the thermal pretreatment following anaerobic digestion process could be reduced from 170.4×10^（-6） to 14.09×10^（-6） at Fe/S=7.75,which means the biogas desulfurization treatment is not required.Under the condition of pH 7.00-7.50 and Fe/S 1-11,pH is the main influencing factor for sulfide removal.Improving the pH of anaerobic digestion is beneficial in reducing the dosage of Fe（Ⅲ）.An Fe/S ratio of 7.0 is the minimum to meet the biogas hydrogen sulfide emission standards during high solid sludge anaerobic digestion.The concentration of hydrogen sulfide was not up to standards if pH was below 7.30.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2018年第1期269-275,共7页
Environmental Science
基金
国家自然科学基金项目(51408458)
国家水体污染控制与治理科技重大专项(2013ZX07315-001-04)
陕西省自然科学基金(2017JM5090)
陕西省科技统筹创新工程计划项目(2016KTZDSF04-02-02)
关键词
高含固污泥
厌氧消化
原位抑硫
预测方程
H2S
：high solid sludge
anaerobic digestion
in-situ sulfur suppression
prediction equation
hydrogen sulfide
