Provincial production and pollution treatment performance in China based on a two-stage eco-inefficiency approach with undesirable intermediate outputs

This study aims to investigate treatment performance of the two-stage upflow anaerobic sludge blanket (UASB) applied to concentrated latex processing wastewater in Thailand. First, optimal conditions including the hydraulic retention time (HRT) in the acid tank and the UASB tank, pH, and temperature (mesophilic and thermophilic) were determined. It was found that the HRT at 24 h and 48 h were the optimal HRT for the acid tank and the UASB tank, respectively. The pH of the system should be controlled at 7 to prevent rubber coagulation and to achieve high treatment performance, and the mesophilic condition (35°C) was found to be the optimal temperature. Second, the two-stage UASB was applied with the optimal conditions mentioned earlier with real wastewater at a latex mill. It was found that methane production was about 0.116 L CH4/g COD removed (16.3–22.8 m3CH4/d), and average chemical oxygen demand (COD) and suspended solids (SS) removal efficiency were about 82% and 92%, respectively. In case of SS removal, the results revealed that the two-stage UASB was capable of overcoming the limitations of the single-stage UASB in treating concentrated latex effluent. The results indicated that application of the two-stage UASB to concentrated latex processing wastewater is feasible. Nevertheless, combination with other treatment systems (e.g., oxidation pond, aerated lagoon) is necessary to meet Thailand's industrial effluent standards (in the case of COD).

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Influence of COD/SO42− ratio on vinasse treatment performance by two-stage anaerobic membrane bioreactor

Journal of Environmental Management ◽

10.1016/j.jenvman.2019.110034 ◽

2020 ◽

Vol 259 ◽

pp. 110034 ◽

Cited By ~ 6

Author(s):

Ana Flávia Rezende Silva ◽

Natalie Cristine Magalhães ◽

Paulo Vitor Martinelli Cunha ◽

Miriam Cristina Santos Amaral ◽

Konrad Koch

Keyword(s):

Membrane Bioreactor ◽

Two Stage ◽

Anaerobic Membrane Bioreactor ◽

Treatment Performance

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Assessing environmental efficiency of China’s industry system using two-stage range-adjusted measure model

Management of Environmental Quality An International Journal ◽

10.1108/meq-12-2020-0282 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Meiqiang Wang ◽

Yingwen Chen ◽

Zhixiang Zhou

Keyword(s):

Energy Efficiency ◽

Technological Innovation ◽

Industrial Production ◽

Environmental Efficiency ◽

Treatment Level ◽

Industrial System ◽

Water Efficiency ◽

Two Stage ◽

Content Type ◽

Pollution Treatment

PurposeThe purpose of this paper is to examine the industrial production efficiency, pollution treatment efficiency, total factor energy efficiency and water efficiency in China with the consideration of technological innovation. This study also explores the distribution proportion of technological innovation between industrial production substage and pollution treatment substage.Design/methodology/approachA nonparametric method, data envelopment analysis (DEA), is used as the model foundation of this study. Specifically, a novel two-stage range-adjusted measure (RAM-DEA) with shared inputs is constructed to analyze the China’s industrial system. In this study, the panel data of 30 provinces from 2008 to 2015 are used.FindingsThis study found that although the current environmental regulation reduced the efficiency of industrial production, it could significantly improve the pollution treatment level. However, the lack of pollution treatment capacity was still an obstacle for development of China's industrial system. Compared with the total factor energy efficiency, the total factor water efficiency had more room for improvement. The optimal distribution of technological innovation in the two substages performed little change and the distribution roughly followed the “three-seven principle”.Practical implicationsMore attention should be paid to improve the pollution treatment level and total factor water efficiency. And more R&D expenditure should be used in the industrial production substage in the eastern coastal areas, while in the inland areas, more R&D expenditure should be used in the pollution treatment substage.Originality/valueThis study proposed a model to environmental efficiency score with considering interval data under two-stage evaluation structure, which could strengthen the theory and expand the application scope of DEA approach.

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A two-stage DEA model for resource allocation in industrial pollution treatment and its application in China

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.04.141 ◽

2019 ◽

Vol 228 ◽

pp. 29-39 ◽

Cited By ~ 13

Author(s):

Jiajia Zhang ◽

Qiang Wu ◽

Zhixiang Zhou

Keyword(s):

Resource Allocation ◽

Industrial Pollution ◽

Two Stage ◽

Dea Model ◽

Pollution Treatment

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Influence of reflux ratio on two-stage anoxic/oxic with MBR for leachate treatment: Performance and microbial community structure

Bioresource Technology ◽

10.1016/j.biortech.2018.01.146 ◽

2018 ◽

Vol 256 ◽

pp. 69-76 ◽

Cited By ~ 23

Author(s):

Jianbo Liu ◽

Zhiyong Tian ◽

Panyue Zhang ◽

Guanglei Qiu ◽

Yan Wu ◽

...

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Reflux Ratio ◽

Leachate Treatment ◽

Two Stage ◽

Treatment Performance

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Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153816 ◽

1989 ◽

Vol 47 ◽

pp. 368-369

Author(s):

Sengshiu Chung ◽

Peggy Cebe

Keyword(s):

Single Crystals ◽

High Performance ◽

Dilute Solution ◽

Two Stage ◽

Annealing Behavior ◽

High Performance Polymers ◽

Seeding Method ◽

Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

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