焦化废水处理过程中特征有机污染物组成及降解特性分析

为了解焦化废水中特征有机污染物组成及其在生物流化床工艺各个阶段的降解特性,采用全二维气相色谱(GC×GC)技术,对不同处理阶段的焦化废水进行了检测,解析了其特征有机污染物的组成和降解规律.结果 显示,焦化废水中主要存在有十三大类的特征有机污染物,经两级缺氧和两级好氧处理后所有物质都有所降解但发生的阶段不同,酚类、吡啶类...     

电解Fenton法处理线路板生产废水中有机物质

研究了Fenton法对线路板生产废水中有机物质的处理效果,比较传统Fenton法和电解Fenton法处理效果。在同样反应时间里,电解Fenton法的COD平均去除率为55.7%,H2O2的最大投加量为3.75 g/L,而传统Fenton法的COD平均去除率为23.7%,H2O2的投加量为5.45 g/L。确定了电解Fenton法小试装置处理线路板废水的最佳处理条件。     

催化湿式氧化技术处理焦化废水

以非贵金属氧化物CuO、Co3O4、La2O3为主要活性成分,以TiO2-ZrO2为载体,制备了CuO-Co3O4-La2O3/TiO2-ZrO2复合负载型催化剂,用该催化剂采用催化湿式氧化技术处理焦化企业在生产过程中产生的焦化废水。系统考察了工艺条件如催化剂加入量、反应温度、反应时间和氧气分压等对催化湿式氧化反应的影响,得到最佳的工艺条件为:催化剂加入量10 g/L,反应温度220℃,氧气分压3.5MPa。在此条件下反应2 h,COD去除率达到98.7%,NH3-N去除率达到97.9%。反应15次COD和NH3-N去除率分别维持在90%和88%左右,表明使用该催化剂在处理焦化废水时显示出良好的催化活性和稳定性。     

Optimization of photo-Fenton process of RO concentrated coking wastewater using response surface methodology

The objective of this study was aimed at investigating the removal of chemical oxygen demand (COD) from reverse osmosis (RO) concentrated coking wastewater by the photo-Fenton process. The optimum extraction conditions for the photo-Fenton process by Box-Behnken design (BBD) and response surface methodology (RSM) to establish a predictive polynomial quadratic model were discussed based on a single factor test. Optimized parameters validated by the analysis of variances (ANOVA) were found to be H(2)O(2) concentration of 345.2 mg/L, pH value of 4.1 and reaction time of 103.5 minutes under ultraviolet irradiation. The experimental results of the COD removal under the optimized conditions presented better agreement with the predicted values with deviation error of 3.2%. The results confirmed that RSM based on BBD was a suitable method to optimize the operating conditions of RO concentrated coking wastewater.     

氧化镍光催化降解蒽醌染料废水

用均相沉淀法制备了NiO粉体,并用XRD和TEM对粉体的晶型及颗粒形貌进行了表征。NiO在紫外光谱区域内具有较强的宽带吸收特性,在紫外光照射下光催化活性高于金红石相的TiO2。以蒽醌染料B-RN和KN-R为降解对象,紫外灯为光源,研究了光照、催化剂的热处理温度、催化剂用量等因素对染料降解率的影响。结果表明:NiO有良好的光催化活性,催化剂在热处理温度350℃、用量100 mg时光催化效果最佳,且在未曝入O2的条件下NiO的光催化活性优于p-25 TiO2。     

焦化废水处理工程的调试与运行

以实际运行中的焦化废水处理站为例,介绍了其调试、运行过程,指出焦化废水调试及稳定运行的控制条件,并对调试运行过程中可能出现的问题及解决措施进行了总结,为同类废水的调试和运行提供了参考。     

Efficient degradation of dye pollutants in wastewater via photocatalysis using a magnetic zinc oxide/graphene/iron oxide-based catalyst

In this paper, we present a proof-of-concept study of the enhancement of photocatalytic activity via a combined strategy of fabricating a visiblelight responsive ternary heterostructure and improving overall photostability by incorporating magnetic zinc oxide/graphene/iron oxide (ZGF). A solvothermal approach was used to synthesize the catalyst. X-ray diffraction (XRD), scanning electron microscopic, energy dispersive X-ray, transmission electron microscopic, vibrating sample magnetometric, and ultravioletevisible diffuse reflectance spectroscopic techniques were used to characterize the synthesized samples. The obtained optimal Zn(NO₃)₂ concentration, temperature, and heating duration were 0.10 mol/L, 600 C, and 1 h, respectively. The XRD pattern revealed the presence of peaks corresponding to zinc oxide, graphene, and iron oxide, indicating that the ZGF catalyst was effectively synthesized. Furthermore, when the developed ZGF was used for methylene blue dye degradation, the optimum irradiation time, dye concentration, catalyst dosage, irradiation intensity, and solution pH were 90 min, 10 mg/L, 0.03 g/L, 100 W, and 8.0, respectively. Therefore, the synthesized ZGF system could be used as a catalyst to degrade dyes in wastewater samples. This hybrid nanocomposite consisting of zinc oxide, graphene, and iron oxide could also be used as an effective photocatalytic degrader for various dye pollutants.     

焦化废水事故排放的风险评价

焦化废水水量大,水质复杂,含有焦油、苯、酚、氟化物、氨氮、硫化物等污染物,是典型的有毒有害工业废水。该文以焦化项目中的废水为主线,分析了焦化废水水质特征,探讨了焦化废水事故排污的风险评价,为焦化项目的环境影响评价起到借鉴作用。     

高浓度焦化废水的预氧化-混凝处理研究

焦化废水成分十分复杂,污染物浓度高,性质非常稳定且水量大,是典型的难降解有机废水。使用H2O2为氧化剂,FeSO4.7H2O为催化剂的Fenton氧化法对钢铁焦化厂废水的终冷水进行了试验研究,氧化处理后用FeCl3为混凝剂对COD,NH3-N,色度及浊度的去除率进行了系统的考查。确定了氧化反应的影响因素和最佳的混凝实验条件。结果表明:当pH值控制在3左右,反应时间为30 min,反应温度为80℃,焦化废水的COD,NH3-N,浊度和色度去除率分别达到了93.1%,96.2%,90.8%和90.2%。     

臭氧组合工艺深度处理酒精废水

研究了混凝-O3、O3-混凝、混凝-H2O2-O3等臭氧组合工艺对某酒精废水的深度处理效果.结果表明:混凝-O3工艺中臭氧的加入同样可以达到单独混凝所达到的出水效果,处理效率高,减少了混凝剂的投加量,从而减少了产泥量;O3-混凝工艺的试验表明,臭氧对混凝存在促进作用,在相同混凝剂和臭氧投加量的条件下,O3-混凝工艺对有机物的去除效果好于混凝-O3工艺;混凝-H2O2-O3工艺中,H2O2的加入提高了臭氧对CODCr的去除效果,H2O2的投加量存在最优值,在本试验中一次性投加H2O2 165 mg/L时CODCr去除率最高,达75%,比未投加H2O2时对CODCr的去除率提高了45%.H2O2分次投加比一次性投加对CODCr的去除率高,同时,随着臭氧投加量的增加,分次投加与一次性投加对CODCr的去除率差距变小.     

粒子电极法深度处理焦化废水实验

对粒子电极法在焦化废水三级处理工艺方面的应用进行实验.结果表明:在电解电压12V、电解时间40min、活性炭加入少量玻璃珠粒子电极条件下,粒子电极法对焦化废水二级处理出水的COD去除率可达到70%.     

焦化废水好氧生物处理过程中泡沫控制的研究

针对活性污泥法处理焦化废水好氧阶段的泡沫影响因素进行试验研究,并对其控制条件进行了优化。试验结果表明,通过活性污泥生物控制法处理的方式,可以有效地解决焦化废水好氧处理产生大量泡沫所带来的污泥流失及周边环境污染问题,当pH在6.8,溶解氧浓度在1.5mg/L,温度在21℃,细胞平均停留时间在24h时,泡沫的厚度可控制在4~7cm。     

焦化废水浓盐水的浓缩减量及近零排放工艺

对焦化废水浓盐水的浓缩减量及近零排放工艺进行说明,主要从水质特点开始对浓盐水预处理单元、膜集成浓缩减量单元及高浓盐水资源化单元的工艺选择和工艺分别进行说明.预处理单元的关键为去除COD和F-的处理工艺及工艺组合,膜集成浓缩减量单元的关键为使用分盐纳滤膜将浓盐水为以氯化钠和硫酸钠为主要成分的浓盐水,然后用膜法/热法分别进行浓缩以降低后续高浓盐水的处理量,减少投资.高浓盐水的资源化分别对蒸发结晶/冷冻结晶干燥工艺生产硫酸钠和氯化钠的方法、利用双极膜生产盐酸/硫酸和氢氧化钠、将氯化钠溶液和硫酸钠溶液做为原料生产应用更广、价值更高产品的方法进行说明.还根据工程案例的建设运行情况对焦化废水浓盐水浓缩减量及近零排放工艺的设计及运行关键点进行说明.     

芬顿法深度处理造纸废水

利用芬顿(Fenton)法对造纸废水生化出水进行深度处理,考察了废水pH值、反应时间、FeSO4投加量和H2O2投加量对废水中色度和CODC r去除率的影响。结果表明:在pH值为5.00、FeSO4投量为400 mg/L、30%H2O2投量为200 mg/L,反应时间为30 m in,出水CODC r可降至60 mg/L以下,色度的去除率可达到74%,可以满足更为严格的造纸废水排放标准,为进一步的工程设计提供依据。     

Numerical modeling of wastewater transport and degradation in soil aquifer

1. INTRODUCTION The wastewater soil treatment system is an ecological treatment system where a self-adjustingand purification mechanism involving land soil– microorganism–plant ecology is formed to effectively treat the wastewater, meanwhile the nutrien…     

TiO2/GeO2复合膜光催化氧化降解染料废水

研究了自制TiO2/GeO2复合膜圆形光催化氧化反应器对经生化处理后的染料废水的降解过程.结果表明光催化氧化的最佳条件是锌片镀TiO2/GeO2复合膜,pH为8,H2O2为400mg/L.染料废水经该反应器处理后,CODCr去除率超过80%,色度去除率约90%,出水水质可达<污水综合排放标准>(GB 8978-1996)一级标准.     

Electrochemical treatment of residual ammonia nitrogen in biologically pretreated coking wastewater with three-dimensional electrodes

The electrochemical oxidation of the residual ammonia nitrogen contained in biologically pretreated coking wastewater using three-dimensional electrode system was studied. The results show the Ti/RuO2/IrO2 anode plates and the coke have good surface characteristics for the purpose of this study. In addition, studies also show that the three-dimensional electrode system should be able to give a satisfied solution to the residual bio-refractory ammonia nitrogen in biologically pretreated coking wastewater in comparison to conventional two-dimensional electrodes. At coke size of 10-20 mesh, electrode distance of 1.0 cm and current density of 4.5 mA/cm2, the residual ammonia nitrogen in the three-dimensional electrode system was almost completely removed in 60 min.     

Anaerobic degradation of purified terephthalic acid wastewater using a novel, rapid mass-transfer circulating fluidized bed

The anaerobic treatability of purified terephthalic acid (PTA) wastewater in a novel, rapid mass-transfer fluidized bed reactor using brick particles as porous carrier materials was investigated. The reactor operation was stable after a short 34 day start-up period, with chemical oxygen demand (COD) removal efficiency between 65 and 75%, terephthalate (TA) removal efficiency between 60% and 70%, and system organic loading rate (OLR) increasing from 7.37 to 18.52 kg COD/m(3) d. The results demonstrate that the reactor is very efficient, and requires a low hydraulic retention time (HRT) of 8 h to remove both TA and COD from the high-concentration PTA wastewater. The system also has high resistance capacity to varied OLR.     

苯酚废水的高级氧化处理技术

以催生·OH自由基为主要氧化剂来氧化处理废水中难降解有机物的高级氧化技术正成为国内外研究的热点课题.分析了多种高级氧化技术对苯酚废水处理的共同作用机理,阐述了催化湿式氧化法、光催化氧化法、电催化技术、超声声化学氧化、超临界水氧化等在含酚废水高级氧化处理中的研究进展及发展趋势.     

臭氧高级氧化技术深度处理印染废水试验研究

研究单独臭氧氧化、O3/H2O2、O3/非均相催化臭氧化技术对去除难降解染料废水CODcr、色度、UV254和提高可生化性的效果。实验结果表明:印染废水最适宜的深度处理方法是O3/MnOx-GAC。当O3投加量为81mg/L时,O3/MnOx-GAC对CODcr、色度和UV254的去除率分别为36.23%、70%和60.67%,B/C由原来的0.1上升到0.26,可采用后续生化处理进一步去除有机物。