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leachate treatment using a demonstration aged refuse biofilter

Journal of Environmental Sciences 2010年第7期22卷 1116-1122页

作者： Hongjiang Li Yingying Gu Youcai Zhao Zhiping Wen State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Shenzhen Environment Engineering Technology Center Shenzhen 518001 China Department of Civil Engineering The University of Hong Kong Pokfulam Road Hong Kong China

Approximately 7000 m^3 of aged refuse （AR） with a placement of over eight years was excavated from Shanghai Refuse Landfill, the largest landfill in China, and used for the construction of a two-stage bioreactor （AR biofilter） media for the biological treatment of 100 m3 of refuse landfill leachate. It was found that over 64% of COD, 96.9%-99.8% of NH4^＋-N, and 95.8%-99.8% of BOD5 could be removed by the AR biofilter, when the leachate with initial COD, BOD5, and NH4^＋-N concentrations were 986-4128 mg/L, 264--959 mg/L,m and 538-1583 mg/L, respectively. The corresponding concentrations in the effluent were reduced to below 30（000 mg/L, 2-12 mg/L, and 10-20 mg/L, respectively. The effluent was clear and pale yellow with suspended solid below 150 mg/L and color below 150 Pt/Co degree. Meanwhile, the total nitrogen removal was only 49%-63%, indicating a relative poor denitrification capacity of AR biofilter. The effluent pH was neutral and the population of Escherichia coli was less than 10^-1 CFU/mL. Hence, it was considered that the demonstration project can work well for the effective treatment of leachate.

关键词： aged refuse landfill leachate treatment COD ammonia

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Composition and Accumulation of Fouling during leachate Reverse Osmosis Membrane treatment in both a Typical Incineration Plant and a Landfill

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Wuhan University Journal of Natural Sciences 2022年第1期27卷 77-84页

作者： YU Lu LI Kunyu YU Zhipeng ZENG Xiaolan College of Environment and Ecology Chongqing UniversityChongqing 400045China Zhuhai Institute of Urban Planning&Design Zhuhai 519002GuangdongChina

Reverse osmosis(RO)membrane process has been extensively used for leachate treatment both in incineration plants and landfills.However,operation and maintenance costs caused by membrane pollution limit the wide application of RO membrane.In order to further understand membrane fouling,this study analyzes the influent,effluent,concentrated liquid pollutants and membrane fouling of typical waste incineration plants and landfills in Chongqing,a city in the west of China based on the comparison of three-dimensional excitation and emission matrix fluorescence(3DEEM)and nanometer particle size.In addition,this paper discusses the change law of chemical oxygen demand(COD)and main pollutants in membrane fouling in the disc tube reverse osmosis(DTRO)system in a single operation cycle,analyzes the main components of membrane fouling,and draws the accumulation of RO membrane pollutants,in order to provide a reference for understanding the composition,formation and control of membrane fouling.

关键词： reverse osmosis(RO)process leachate treatment properties of membrane fouling fouling formation incineration plant landfill

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Study of Coagulation Process with Lime in treatment of Landfill leachate from Fkih Ben Salah City (Morocco)

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Journal of Geoscience and Environment Protection 2020年第9期8卷 197-211页

作者： Merzouki Hasna Hnini Rachid Brhich Amina Ellaite Mohammed Hanine Hafida Lekhlif Brahim Mandi Laila Bahi Lahoucine Merzouki Mohammed Laboratory of Bioprocess and Biointerface Faculty of Science and Technology University of Sultan Moulay Slimane Beni Mellal Morocco Laboratory of Biological Engineering Faculty of Science and Technology University Sultan Moulay Slimane Beni Mellal Morocco Research Team Hydrogeology/treatment and treatment of Waters and Climate Change Laboratory of Environmental Engineering Hassania School of Public Works Casablanca Morocco National Center for Studies and Research on Water and Energy (CNEREE) University Cadi Ayyad Marrakech Morocco

The leachates are the seat of complex processes which give them a heterogeneous character. Their compositions vary according to several factors: nature of the waste, conditions of their deposition, climatic conditions, their durations of stay, etc. They contain important quantities of organic, mineral matters even of bacteria, which require their treatment in order to safeguard the environment. To do this, several methods are used, such as membrane techniques (reverse osmosis, nanofiltration, etc.), biological techniques (activated sludge, SBR, etc.) and physicochemical techniques (Coagulation-flocculation, adsorption on activated carbon, etc.). Among these techniques, the leachate treatment by coagulation process with the lime showed interesting reduction of the various pollutants: 92.95% of turbidity, 88.23% of suspended matter, 89.89% of COD, 90.83% of BOD5, 78.39% of Fe, 77.78% of Mo, 38.29% of Cd, 48.75% of Al, 50.24% of S2-, 20.57% of K+, 27.24% of phosphorus and 19.53% of Cl-. Based on these results, the coagulation with the lime reveals interesting because it allows to reduce at a lesser cost the pollutants present in leachates.

关键词： leachate treatment Pollutants Biological Techniques Physicochemical Techniques

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Chromium phosphide nanoparticles embedded in porous nitrogen-/phosphorus-doped carbon as efficient electrocatalysts for a nitrogen reduction reaction

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Carbon Energy 2022年第2期4卷 237-245页

作者： Jiayuan Yu Bin Chang Wanqiang Yu Xiao Li Dufu Wang Zhinian Xu Xiaoli Zhang Hong Liu Weijia Zhou Institute for Advanced Interdisciplinary Research(IAIR) Shandong Collaborative Innovation Center of Technology and Equipements for Biological Diagnosis and TherapyUniversity of JinanJinanChina Shandong Best Environmental Technology Co.Ltd. JinanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina State Key Laboratory of Crystal Materials Shandong UniversityJinanChina

The resource recovery of heavy metals from effluent has significant environmental implications and potential commercial value.Chromium phosphide nanoparticles embedded in a nitrogen-/phosphorus-doped porous carbon matrix(CrP/NPC)are synthesized via a consecutive Cr^(6+)leachate treatment and resource recovery process.Electrochemical testing shows that CrP/NPC shows excellent nitrogen reduction reaction(NRR)performance,which yields the highest NH_(3) production rate of 22.56μg h^(−1) mg^(−1)_(cat).and Faradaic efficiency(16.37%)at−0.5 V versus the reversible hydrogen electrode in a 0.05M Na_(2)SO_(4) aqueous solution,as well as robust catalytic stability.The isotopic experiments using ^(15)N^(2) as a nitrogen source confirm that the detected NH_(3) is derived from the NRR process.Finally,density functional theory(DFT)calculations show that the electron deficiency environment of the Cr site can significantly reduce the barrier of the NRR process and promote the formation of intermediate species.

关键词： biosynthesis carbon-based materials chromium phosphide leachate treatment nitrogen reduction reaction resource recovery

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