Materials Engineering -- From Ideas to Practice: An EPD Symposium in Honor of Jiann-Yang Hwang: Wastewater Treatment
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee, TMS: Pyrometallurgy Committee
Program Organizers: Bowen Li, Michigan Technological University; Baojun Zhao, Jiangxi University of Science and Technology; Jian Li, CanmetMATERIALS; Sergio Monteiro, Instituto Militar de Engenharia; Zhiwei Peng, Central South University; Dean Gregurek, RHI Magnesita; Tao Jiang, Central South University; Yong Shi, Futianbao Environment Technologies; Cuiping Huang, FuTianBao Environment Protection Technology Company Ltd.; Shadia Ikhmayies
Wednesday 2:00 PM
March 17, 2021
Room: RM 41
Location: TMS2021 Virtual
Session Chair: Jinjing Luo, Xiamen University; Jiann-Yang Hwang, Michigan Technological University
2:00 PM Invited
Development and Management of Industrial Park for Chinese Electroplating Industry: Yong Shi1; Cuiping Huang1; Zhibo Huang2; Jiann-Yang Hwang3; 1Futianbao Environmental Protection, Ltd; 2Futianbo Environment Protection Technology, Ltd; 3Michigan Technological University
Electroplating is critical to the manufacturing but has been unwelcome to local government and residents due to its potential to cause serious environmental pollution. There are many kinds of plating, such as copper, nickel, zinc, and chromium based on the kinds of metal plated, or other varieties based on the plating methods or additives. Industrial park to house a variety of electroplating industries together has been proposed and developed. This approach provides professional operations to manage and treat the complicate environmental issues that most electroplating plants have difficulties to handle. Examples of these operations are provided.
2:20 PM Invited
Mercury Removal by Bio-chars with Plasma Surface Modification: Jinjing Luo1; 1Xiamen University
Bio-char samples were modified by the dielectric barrier discharge (DBD) plasma method to enhance the adsorption capacity for gaseous mercury (Hg0). Cl and O active sites were introduced onto biochar surfaces by hydrogen chloride non-thermal plasma and simulated air non-thermal plasma respectively. Surface modified biochar was then placed in flue gas with typical components to investigate its elemental mercury (Hg0) capture ability. To elucidate the adsorption mechanism & binding properties, samples were characterized by N2 adsorption, SEM-EDS, XPS, Hg-TPD and X-ray absorption near edge structure (XANES) analysis of Hg LIII-edge, Cl K-edge and S K-edge. Experimental results showed that plasma modification altered the surface structure and organic chlorides generated on biochar surface. Qrganic chlorides, organic sulfur, lactone group and carboxyl group were assumed to be the main active sites to react with Hg. XANES spectra revealed that adsorbed-Hg on HCl-treated biochar mainly in the form of Hg+.
2:40 PM Invited
Electroplating Wastewater Treatment in China: Zhibo Huang1; Jiann-Yang Hwang2; Cuiping Huang1; Yong Shi1; 1Futianbo Environment Protection Technology, Ltd; 2Michigan Technological University
Electroplating is one of the most importing part in the modern manufacturing industry. All of our modern electronics need some sort of electroplating process to help it achieve its goals. From smart phone, computer, heavy machinery, decoration, to motor vehicle, almost everything that we used nowadays need electroplating in some ways. However, at the same time electroplating factory can do much harm to the natural environment. Electroplating industry produce 2.7 billion gallon of waste water in China every year. And most of it won’t be treated to the required level and all goes to the river and ocean. This cause a big issue for the environment.Futianbao Environment Protection Technology Ltd. developed a new way to treat the electroplating waste water. This technology meets the "zero emission" requirement in China. At the same time, it achieves the goal of harmful waste reduction and resource recycling.
3:00 PM Invited
Effects of Ozone on COD Reduction in Electroplating Wastewater: Yahui Sun1; Jiann-Yang Hwang2; Lili Xi1; Zhixing Fu1; Fujiu Nian1; Yang Yang1; Xin Chen1; 1Futianbo Environment Protection Technology, Ltd; 2Michigan Technological University
Electroplating industry is one of the surface treatment industries with strong versatility and wide application range. Electroplating process mainly includes pretreatment, electroplating and post-treatment. In order to achieve specific effects, additives such as brightener, sub brightener, surfactant and others are indispensable in the electroplating process. These organics usually have poor biodegradability. In addition, due to the high toxicity of electroplating wastewater, biological treatment has great limitations on their decomposition. These organic compounds cause the increase of COD in electroplating wastewater, which seriously pollutes the membrane system and hinders the development of electroplating wastewater reuse process. In this study, ozone is investigated for the oxidation of organics and the results are discussed.
3:20 PM
Extraction of Cerium from Catalyst of Waste Automobile Exhaust Gas Purifier: Chen Ailiang1; Guanwen Luo1; Mao Jiale1; Lu Sujun2; Ma Yutian2; Du Zuojuan1; Chen Shengli2; Pan Yujun1; Qiao Jinxi1; Bowen Li3; 1Central South University; 2State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization; 3Michigan Technological University
Automobile exhaust catalyst has been more and more widely used for creating a green life. It contains abundant platinum, palladium, rhodium and rare earth cerium, compared with primary resources. It’s necessary to efficiently recover valuable metals with great application value. The feasibility of leaching cerium from hydrochloric acid system is mainly analyzed from the perspective of thermodynamics in this paper. The leaching experiment of hydrochloric acid oxidation is carried out. The results show that the leaching rate of cerium reaches only 46% when the concentration of hydrochloric acid was 4 mol/L, the reaction temperature was 80 C, the amount of hydrogen peroxide was 10 ml, the liquid-solid ratio was 10:1, the reaction time was 2 h and the stirring speed was 450 r/min. According to the metal equilibrium, it is inferred that the formation of stable Ce-Zr solid solution makes the lower leaching rate of cerium.
3:40 PM Invited
A New Electroplating Wastewater Treatment Process Using Electric Lime and Vacuum Filtration: Zhixing Fu1; Jiann-Yang Hwang2; Yahui Sun1; Yang Yang1; Fujiu Nian1; Lili Xi1; Zhibo Huang1; 1Futianbo Environment Protection Technology, Ltd; 2Michigan Technological University
This study explores a new electroplating wastewater treatment process which could be cheaper and more efficient than the conventional approaches. The process consists of 3 steps: 1) electric lime is added to the electroplating wastewater to adjust the pH to around 9; 2) activated carbon is added to the turbid liquid; and 3) vacuum filter is used to replace traditional sedimentation tank for solid-liquid separation. Electric lime is used to replace liquid alkali for pH adjustment, which can greatly reduce production cost. Compared with the traditional sedimentation tank, the vacuum filter occupies less space, has lower operating cost and higher filtration speed, which greatly improves the production efficiency. The effluent of treated electroplating wastewater using the new process has the COD content reduced by about 60%, and the total oil content reduced by about 80%. This is obviously better than the traditional treatment process.
4:00 PM
COD Removal from Electroplating Degreasing Wastewater by UV/H2O2 Process: Jianjun Liu1; Zhichao Chen1; Lili Xi1; Jiann-Yang Hwang2; Yong Shi1; 1Futianbao Environmental protection technology; 2Michigan Technological University
Degreasing wastewater is a common type of wastewater produced from surface degreasing process in electroplating industry. It has the characteristics of high pH, high oil content and high COD value. This paper studied COD reduction of electroplating degreasing wastewater by UV/H2O2 oxidation process, and factors that affect COD removal rate. Those include H2O2 dosage, feeding method, and pH value. The optimized reaction condition for COD removal by UV/H2O2 process was suggested in the paper.
4:20 PM Invited
Oxidation of Cyanide and Simultaneous Copper Electrodeposition from Electroplating Wastewater in an Electrochemical Reactor: Yang Yang1; Fujiu Nian1; Dong Xu1; Yahui Sun1; Jiann-Yang Hwang2; Peiyu Qiao1; Zhixing Fu1; Lili Xi1; 1Futianbo Environment Protection Technology, Ltd; 2Michigan Technological University
Copper was widely used in electroplating，and a lot of waste water was produced in the rinsing process. Copper-containing electroplating wastewater can be divided into cyanide wastewater and copper sulfate wastewater according to the difference of plating process. This study is to explore the feasibility of cyanide oxidation and cupric reduction in an electrochemical reactor using an anion exchange membrane as the diaphragm. In the anolyte compartment cyanide in the cyanide wastewater was oxidized to Cyanate, and furthermore, to Carbon dioxide and nitrogen. In the catholyte compartment cupric in the copper sulphate wastewater was restored to copper. This study showed that the dosage of sodium hypochlorite used in the cyanide oxidation was decreased from 95g/L to 15g/L and over 80% copper was recovered from copper sulphate wastewater by electrolysis.
4:40 PM Invited
Treatment of Electroless Nickel Plating Wastewater by Ozone Oxidation: Lili Xi1; Yahui Sun1; Jiann-Yang Hwang2; Fujiu Nian1; Zhixing Fu1; Yang Yang1; Cuiping Huang1; 1Futianbo Environment Protection Technology, Ltd; 2Michigan Technological University
Electroless nickel plating technology is widely used for its unique advantages. However, the waste water produced by electroless nickel plating contains a large amount of phosphorus and nickel. The heavy metal nickel is carcinogenic and has sensitizing effects. It is also toxic to environmental organisms. Phosphorus is a well-known factor that leads to eutrophication of water bodies. How to effectively deal with the waste solution of chemical nickel plating, turning the environmental pollutants into recyclable resources, and reducing the damage to the ecological environment are of great significance. This article applies ozone to the treatment of nickel waste water. Its success brings the possibility of developing a new method for the treatment of nickel waste water.