Han Yun, Cao Yu-Qin, Zhuo Yang, Wang Xiao-Fei, Han Ya-Ting, Peng Dang-Cong
School of Municipal and Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2018 Jan 8;39(1):269-275. doi: 10.13227/j.hjkx.201706197.
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 to 14.09×10 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.
为评估铁硫比（Fe/S）和pH值对硫化物去除效率的影响以及Fe/S与pH之间的相互作用，利用某污水处理厂（WWTP）的脱水污泥进行了厌氧硫化氢原位抑制试验和消化污泥液硫化物去除试验。结果表明，在Fe/S = 7.75时，厌氧消化后热预处理产生的沼气中硫化氢浓度可从170.4×10降至14.09×10，这意味着无需进行沼气脱硫处理。在pH值为7.00 - 7.50且Fe/S为1 - 11的条件下，pH是影响硫化物去除的主要因素。提高厌氧消化的pH值有利于减少Fe(Ⅲ)的用量。在高固体污泥厌氧消化过程中，Fe/S比为7.0是满足沼气硫化氢排放标准的最小值。如果pH值低于7.30，硫化氢浓度将达不到标准。
