混合微电解-生物铁-气浮法处理印染废水

印染行业的废水具有高浓度、高色度和含有大量难降解有机物的特点,属于难降解、重污染工业废水,如采用传统处理工艺,很难达到国家一级排放标准.实践证明,采用混合微电解 生物铁 气浮法处理此类生产废水,CODCr去除率达97%,色度去除率达98%.同时,该工艺具有占地面积小,脱色效果好,处理效率高等特点,能广泛应用于纺织印染废水处理的实际工程中.     

铁炭微电解-ASBR-SBR联合处理喹吖啶酮类颜料废水

采用铁炭微电解-ASBR-SBR联合处理喹吖啶酮类颜料废水。对铁炭微电解中各种因素进行了正交试验,进水pH5,铁水比(体积分数)为0.375,铁/炭比(体积分数)为1,停留时间60min为铁炭微电解反应的最佳工艺组合。其出水进行ASBR-SBR生化处理,结果表明:将此3种方法联合对含喹吖啶酮颜料有机废水的处理效果十分明显,在最佳实验条件下,CODCr脱除率和脱色率均达到95%以上。     

Fe~0-C-Clay陶粒用于亚甲基蓝模拟废水处理的研究

针对传统微电解工艺存在的填料板结问题,烧制了一种新型微电解材料——Fe0/C/Clay陶粒,并将其应用于亚甲基蓝模拟废水的处理。单因素试验筛选的最佳试验参数为:亚甲基蓝浓度为1 000 mg/L,pH=5,A/L=1.5,HRT=4 h,此时色度去除率和COD去除率分别为90%和58%。紫外可见光谱扫描分析表明:可见光区的吸收明显减少。连续运行试验发现,出水水质稳定时间较长,运行中陶粒填料没有发生板结。     

Degradation mechanism of Direct Pink 12B treated by iron-carbon micro-electrolysis and Fenton reaction

The Direct Pink 12B dye was treated by iron-carbon micro-electrolysis (ICME) and Fenton oxidation. The degradation pathway of Direct Pink 12B dye was inferred by ultraviolet visible (UV-Vis), infrared absorption spectrum (IR) and high performance liquid chromatography-mass spectrometry (HPLC-MS). The major reason of decolorization was that the conjugate structure was disrupted in the iron-carbon micro-electrolysis (ICME) process. However, the dye was not degraded completely because benzene rings and naphthalene rings were not broken. In the Fenton oxidation process, the azo bond groups surrounded by higher electron cloud density were first attacked by hydroxyl radicals to decolorize the dye molecule. Finally benzene rings and naphthalene rings were mineralized to H₂O and CO₂ under the oxidation of hydroxyl radicals.     

微电解-UASB组合工艺处理糠醛废水

针对糠醛废水pH低、有机物含量高、污染物成分复杂难降解等特点,采用微电解-UASB组合工艺处理糠醛废水。试验结果表明:后续UASB法产生颗粒污泥后,在进水ρ(COD)超过5 000 mg/L,pH值为5左右时,废水去除率稳定在80.5%以上,出水pH值为7,表明该工艺具有良好的应用前景。     

铁炭耦合Fenton试剂-混凝沉淀法预处理DMAC废水

N,N-二甲基乙酰胺(DMAC)危害大,是化纤废水中的主要污染物之一. 采用铁炭微电解-Fenton试剂-混凝沉淀工艺预处理DMAC废水. 结果表明:在海绵铁投加量为30 g/L,铁炭体积比为1,pH为2,微电解反应1 h,H₂O₂投加量为5 mL/L,pH为3,Fenton试剂反应2.0 h,混凝沉淀pH为9.0,沉淀40 min的最佳工艺条件下,COD_Cr的去除率可稳定在70%以上;紫外可见分光光计测定证明,经微电解反应后DMAC的助色基团—CH₃和CO被破坏,经过Fenton 氧化后,—NH—基团才能被破坏,废水中的大分子物质被破坏,最终转变成小分子物质,为后续处理奠定了基础.      

Fenton试剂强化微电解工艺预处理难降解含氰农药废水

采用Fenton试剂强化微电解反应预处理难降解含氰农药废水.实验结果表明,在总反应时间为3.0 h、反应开始时加入1 mL/L H2O2、反应1.5 h后再加入3mL/L H2O2的条件下,出水COD为372.0 mg/L,COD去除率可达80.2％,出水p(CNˉ)为2.2 mg/L,色度为20倍,BOD5/COD为0.35,可实现处理效果与经济成本的最优化.采用紫外-可见光谱分析处理后废水,发现Fenton试剂强化微电解反应可破坏部分微电解作用难以降解的有机物,但对苯环的降解能力均有限.     

处理硝基苯废水的新型微电解-生物强化技术

根据辽宁某化工企业的实际情况,采用新型微电解-生物强化技术对硝基苯废水进行中试研究.处理后,硝基苯类物污染物全部转化,苯胺类污染物去除率达95%以上,COD 66 mg/L,苯胺O.4 mg/L.出水达到<污水综合排放标准>(GB 8978-1996)规定的一级排放标准.根据废水酸性水质,研发了新型微电解设备.该设备运行稳定,处理效果良好,克服了以往微电解设备经常出现的堵塞和板结现象.     

Treatment of oilfieid produced water by anaerobic process coupled with micro-electrolysis

Treatment of oilfield produced water was investigated using an anaerobic process coupled with micro-electrolysis (ME), focusing on changes in chemical oxygen demand (COD) and biodegradability. Results showed that COD exhibited an abnormal change in the single anaerobic system in which it increased within the first 168 hr, but then decreased to 222 mg/L after 360 hr. The biological oxygen demand (five-day) (BOD5)/COD ratio of the water increased from 0.05 to 0.15. Hydrocarbons in the wastewater, such as pectin, degraded to small molecules during the hydrolytic acidification process. Comparatively, the effect of ME was also investigated. The COD underwent a slight decrease and the BOD5/COD ratio of the water improved from 0.05 to 0.17 after ME. Removal of COD was 38.3% under the idealized ME conditions (pH 6.0), using iron and active carbon (80 and 40 g/L, respectively). Coupling the anaerobic process with ME accelerated the COD removal ratio (average removal was 53.3%). Gas chromatography/mass spectrometry was used to analyze organic species conversion. This integrated system appeared to be a useful option for the treatment of water produced in oil fields.     

Fe/C微电解法去除制药废水中磷试验研究

用Fe/C微电解法处理制药废水中的含磷物质,并与加入直接铁屑对废水中总磷的去除方法加以对比。实验结果表明,在酸性条件下,铁碳微电解法经过4～6小时曝气后对总磷的去除率在80.0%～85.9%;再经过4小时曝气后调节至碱性情况下,总磷的去除率为96.0%～99.4%,铁碳微电解法的去磷效率远高于直接加入铁屑除磷,同时铁碳微电解法对废水中的COD也有一定的去除。