摘要
炼油厂含硫污水因含高浓度的油、COD、硫化物及挥发酚而难于生化降解,催化剂生产中排放的污水因含高浓度的氨氮、盐类、悬浮物质以及低浓度的有机物而成为水处理的难题.本文采用一种曝气生物流化床(ABFT)工艺,对含硫污水和催化剂高氨氮污水的混合污水进行了现场连续试验,结果表明:在混合污水COD为2090mg/L、氨氮为600mg/L、挥发酚为27mg/L和硫化物为154mg/L的情况下,ABFT系统出水COD为95mg/L、氨氮为4.0mg/L、挥发酚为0.30mg/L和硫化物为0.0067mg/L,出水达到了国家污水排放标准一级标准.在处理工艺中,动态氧化和混凝沉淀作为预处理,ABFT反应器采用了合成高分子载体固定化微生物技术,该载体具有大孔网状以及优良的机械强度和化学性能,高效微生物B350通过化学键固定在载体上.克氏定氮法表明,ABFT中生物负载量为32mg/L.试验结果显示:在处理高氨氮污水方面,ABFT工艺比SBR工艺具有更强的优势,同时,ABFT系统具有较高的处理效率和耐冲击负荷能力.
Wastewaters from petrochemical plants are of two types： high sulfur wastewater with high levels of sulfur, oil, chemical oxygen demand （COD） and phenol; and high ammonia-nitrogen wastewater emanating from catalyst workshops, which contains large concentrations of ammonia-nitrogen, salinity, suspended solids （SS） and lower organic pollutants. Conventional biological treatments are expensive and not very effective at handling both kinds of wastewater stream. In this paper, a new aerobic biological fluidized bed technology （ABFT） process is proposed, whereby a mixture of the two kinds of wastewater is treated. A pilot experiment has been conducted to examine the feasibility of treating the mixed wastewater stream. In the experiment, the initial mean concentrations of contaminants in the mixed wastewater are： COD = 2090mg · L^-1 NH4^＋,NH4^＋ = 600mg·L-1 volatile phenol = 27mg · L^-1 and sulfide = 154mg· L^-1. After treatment by the ABFr process, the mean concentrations are as follows： COD =95mg·L^-1, NH4^＋-N =4. 0mg · L^-1 , volatile phenol 0. 30mg· L^-1 and sulfide 0. 0067mg· L^-1. The results meet the demands of China＇s National First-grade Standard for Integrated Wastewater Discharge. In the ABFr process, methods of dynamic oxidation, mixing and sedimentation are applied to wastewater pretreatment, with the use of immobilized microorganisms on a patented synthesized polymer carrier providing the core technology. The carrier employed as fluidized media in the ABFr reactor has a porous reticular structure, and it exhibits excellent mechanical strength and chemical characteristics. Highly efficient B350 microorganisms have been selected that can be immobilized on the carrier by chemical bonds. The Kjeldahl-Gunning test for nitrogen determination indicates that the meanaverage immobilized biomass on the carrier is 32g · L^-1 （H2O）. Experimental investigations show that the proposed ABFT process has overwhelming advantages over the conventional sequencing biological reactor （SBR�
出处
《应用基础与工程科学学报》
EI
CSCD
2005年第4期345-357,共13页
Journal of Basic Science and Engineering
基金
Thestudyhasbeenimbursedbytheimportantprojectof863program(2003AA601010)andtheresearchofkeyproblemonenvironmentprotectinGansuprovince(GH99-4)
关键词
曝气生物流化床(ABFT)
固定化微生物
含硫污水
高氨氮污水
动态氧化
aerobic biological fluidized bed technology （ABFT）
immobilized microorganisms
sulfur-containing wastewater
high ammonia-nitrogen wastewater
dynamic oxidation
