摘要
针对现有矿井水处理技术存在投药量大、处理时间长、出水水质不稳定的问题,对常规矿井水进行管道微絮凝-超滤工艺试验研究。结果表明,管道微絮凝-超滤工艺处理矿井水性能良好,出水浊度均在0.07 NTU以下,去除颗粒物主要依靠超滤膜的筛分作用,微絮凝混凝剂种类、加药量、管长、管径等对浊度的去除效果影响不大;随着投药量的增加,Zeta电位逐渐减小并接近零点,随着运行时间的进行膜比通量衰减程度逐渐减小;当投药量为6 mg/L膜比通量J/J_(0)值下降最小。随着管道长度的增加,膜比通量的下降速率逐渐缓慢,管长在20~30 m,对应反应时间约20~30 s,较合适。流速对反应效果和超滤影响较大,流速在0.9 m/s左右较佳。随着运行压力的增大,产水率增大,膜比通量呈降低趋势。物理污染(颗粒堵塞)是矿井水对超滤膜污染的主要原因,最佳清洗方式为水力冲洗;微絮凝器管径4 mm,管长20 m,PAC投加6 mg/L,超滤跨膜压差为0.18 MPa时,过滤30 min膜比通量J/J_(0)为0.815,产水率为93.8%。
In view of the large regent consumption,long processing time and unstable effluent water quality in the current mine water treatment technology,a pipe micro-flocculation and ultra-filtration processing test of conventional mine water was carried out.The results show that,the pipe micro-flocculation and ultra-filtration process performed well,and the turbidity of the effluent is all below 0.07 NTU.The removal of particulates mainly depends on the screening effect of ultra-filtration membrane,while the coagulant type and dosage,the pipe length and diameter in micro-flocculation have little effect on the turbidity decline.With the increase of dosage,Zeta potential gradually decreases and approaches zero,and the attenuation degree of membrane specific flux gradually decreases with the running time.When the dosage is 6 mg/L,the decrease of membrane specific flux J/J_(0)is the smallest.With the increase of pipe length,the decline rate of membrane specific flux slows gradually,and the pipe length is 20~30 m,and the corresponding reaction time is about 20~30 s,which is more suitable.The flow rate has great influence on the reaction effect and ultra-filtration,and the optimal flow rate is about 0.9 m/s.With the increase of operating pressure,the water yield increases and the membrane specific flux decreases.Physical contamination(particle blockage)is the main cause of mine water pollution to ultra-filtration membrane,and the best cleaning method is hydraulic flushing.When the diameter of the micro-flocculator is 4 mm,the length of the pipe is 20 m,the dosage of PAC is 6 mg/L,and the transmembrane pressure difference of ultra-filtration is 0.18 MPa,the membrane specific flux J/J_(0)is 0.815 after filtration for 30 minutes,and the water yield is 93.8%.
作者
李福勤
高珊珊
薛甜丽
豆硕超
何绪文
LI Fuqin;GAO Shanshan;XUE Tianli;DOU Shuochao;HE Xuwen(College of Energy and Environmental Engineering,Hebei University of Engineering,Handan 056038,China;Hebei Technology Innovation Center of Water Pollution Control and Water Ecological Remediation,Handan 056038,China;School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《煤炭工程》
北大核心
2023年第6期20-24,共5页
Coal Engineering
基金
河北省自然科学基金智慧矿山联合基金资助项目(E2021402015)。
关键词
微絮凝
超滤
聚瓷膜
矿井水
膜通量
micro flocculation
ultra-filtration
polyceramic membrane
mine water
membrane fouling
