摘要
针对沼液中悬浮物和胶体颗粒物含量高、造成膜浓缩预处理难的问题,该研究选择50和200 nm两种孔径陶瓷膜进行了运行条件、水质处理和污染清洗效果的试验。结果显示:在0.3 MPa的运行压力下,50,200 nm两种孔径陶瓷膜对浊度的去除率均能够达到99%以上,对COD的去除率分别为36.2%±0.6%和32.6%±1.5%,无明显差异。同在0.3 MPa运行压力下,200 nm孔径陶瓷膜膜通量可以达到100.6 L/(m^2×h),高于50 nm陶瓷膜膜通量的52.8%。200 nm陶瓷膜对总磷、TOC、氨氮、总氮和总钾的去除率分别为61.2%,35.0%,3.8%,6.2%和3.0%。采用1%氢氧化钠+1%柠檬酸组合清洗方式取得了较好的清洗效果,陶瓷膜的膜通量恢复率可达95.4%。
Due to the high concentration of suspend solids(SS) and colloidal particulate matter in digested slurry, it is difficult to pretreat with membrane concentrate treatment process. However, the pretreatment with organic membrane has some shortcomings in terms of pollution resistance and service life. Given to the advantages of ceramic membrane(CM), such as large flux, anti-pollution ability and other characteristics, it is gradually being applied to pretreat digested slurry. However, the key parameters that affect the performance of CM, such as membrane pore size and operating pressure, need to be determined based on the quality of the raw materials. Aiming at this problem, 50 and 200 nm CMs were used to pretreat digested slurry. In addition, the performance of CM, water quality characteristics of effluent, and membrane fouling cleaning strategies were investigated simultaneously. Membrane flux, COD(chemical oxygen demand) and turbidity removal effectivity were used to select the appropriate pore size and operating pressure. Then, a continuous batch test was conducted to examine the stability and the recovery of membrane flux with the appropriate pore size(200 nm) and operating pressure(0.3 MPa). The results showed that with the operating pressure of 0.3 MPa, both of the turbidity removal rates of 50 and 200 nm CM could reach more than 99%, and there was no significant difference on the COD removal between 50 and 200 nm CM, which was 36.2%±0.6% and 32.6%±1.5%, respectively. However, the maximum membrane flux could reach 100.6 L/(m^2×h) for 200 nm CM with the operating pressure of 0.3 MPa, which was 52.8% higher than that found in 50 nm CM. However, when the operating pressure exceeded 0.3 MPa, the membrane flux increase rate reduced remarkably. While increasing the operating pressure of 200 nm CM to 0.35 MPa, the membrane flux rose to 105.0 L/(m^2×h). Thus, considering membrane flux, turbidity and COD removal efficiencies, 200 nm ceramic membrane at 0.3 MPa operating pressure was selected as experimental conditi
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2018年第5期212-218,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
现代农业产业技术体系建设专项资金(CARS-35)
公益性行业(农业)科研专项项目(201303091)
国家重点研发计划专项课题(2017YFD0800804)
关键词
废水处理
净化
陶瓷膜
沼液
预处理
膜污染
wastewater disposal
purification
ceramic membrane
digested slurry
pretreatment
membrane fouling
