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An assessment Protocal of ammonia removal Efficacy for Air Purification Products

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日用化学品科学:英文版 2023年第3期8卷 27-31页

作者： Li Rongjie Ma Jiaoying Zhang Tianyi Whealth Lohmann Centralin(GZ)Co. Ltd.China

A device is designed to assess the ammonia removal effect of passive air purification products which derived the QB/T 2761-2006 Methods for determination of purificatory effect of indoor environment decontamination product.The device is composed of three parts:ammonia generator,ammonia removal device and ammonia collection device,which is made up of common laboratory equipment.The reagents used are common acid and alkali reagents in the laboratory.During the experiment,5.0mL of 25%concentrated ammonia water is added to the ammonia generator as the ammonia source,and filter paper is used as the sample carrier.Take 3.0g sample and add it to the filter paper,after the ammonia is absorbed by the filter paper with the sample,the residual ammonia is collected and measured by acid-base titration.The ammonia removal efficacy of the sample is calculated by the ammonia absorption amount of the blank sample and the sample to be tested.This method has the characteristics of simple equipment,small area,toxic or harmful substance free,and fabulous accuracy.Four different samples were tested,and the results matched the standard method.

关键词： device designing convenient ammonia removal

ammonia and phosphorus removal from using cash crop waste-derived agricultural runoff biochars

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Frontiers of Environmental Science & Engineering 2020年第3期14卷 141-153页

作者： Alisa Salimova Jian'e Zuo Fenglin Liu Yajiao Wang Sike Wang Konstantin Verichev State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Beijing JingYi Air Protection&Technology Company Wanda Plaza93 Jianguo RoadChaoyang DistrictBeijing 100022China Institute of Civil Engineering Faculty of Engineering SciencesUniversidad Austral de ChileValdivia 5090000Chile

Adsorption of biochars(BC)produced from cash crop residuals is an economical and practical technology for removing nutrients from agricultural runoff.In this study,B C made of orange tree trunks and tea tree twigs from the Laoguanhe Basin were produced and modified by aluminum chloride(Al-modified)and ferric sulfate solutions(Fe-modified)under various pyrolysis temperatures(200℃-600℃)and residence times(2-5 h).All produced and modified B C were further analyzed for their abilities to adsorb ammonia and phosphorus with initial concentrations of 10-40 mg/L and 4-12 mg/L,respectively.Fe-modified Tea Tree B C 2h/400℃showed the highest phosphorus adsorption capacity of 0.56 mg/g.Al-modified Orange Tree B C 3h/500℃showed the best performance for ammonia removal with an adsorption capacity of 1.72 mg/g.FTIR characterization showed that P=O bonds were formed after the adsoiption of phosphorus by modified BC,N-H bonds were formed after ammonia adsorption.X P S analysis revealed that the key process of ammonia adsorption was the ion exchange between K+and N H 44.Phosphorus adsorption was related to oxidation and interaction between PO43-and Fe3+.According to X R D results,ammonia was found in the form of potassium amide,while phosphorus was found in the form of iron hydrogen phosphates.The sorption isotherms showed that the Freundlich equation fits better for phosphorus adsorption,while the Langmuir equation fits better for ammonia adsorption.The simulated runoff infiltration experiment showed that 97.3%of ammonia was removed by Al-modified Orange tree B C 3h/500℃,and 92.9%of phosphorus was removed by Fe-modified Tea tree B C 2h/400℃.

关键词： Biochar Adsorption ammonia removal Phosphorus removal Agricultural runoff

Recent advances in application of moving bed bioreactors for wastewater treatment from recirculating aquaculture systems: A review

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Aquaculture and Fisheries 2022年第3期7卷 244-258页

作者： Abubakar Shitu Gang Liu Aliyu Idris Muhammad Yadong Zhang Musa Abubakar Tadda Wanhe Qi Dezhao Liu Zhangying Ye Songming Zhu Institute of Agricultural Bio-Environmental Engineering College of Bio-systems Engineering and Food ScienceZhejiang UniversityHangzhou310058China Key Laboratory of Equipment and Informatization in Environment Controlled Agriculture Ministry of AgricultureHangzhou310058China Department of Agricultural and Environmental Engineering Faculty of EngineeringBayero UniversityKanoNigeria

In recent years,government investments in implementing restrictive public policies on the treatment and discharge of effluents from the aquaculture industry have increased.Hence,efficient and cleaner methods for aquaculture production are needed.Recirculating aquaculture systems(RAS)offers water conservation by recycling the treated aquaculture water for reuse.RAS wastewater treatment using a moving bed bioreactors(MBBRs)process has been considered well suited for maintaining good water quality,thereby making fish farming more sustainable.Currently,improvements were achieved in tackling the influence of salinity,organic matter,disinfectant,and bioreactor start-up process on the MBBR performance efficiency.This review highlights an updated overview of recent development made using MBBR to treat the residual water from RAS.Precisely,nitrification and simultaneous nitrification-denitrification(SND),and other hybrid processes for nitrogen removal were elucidated.Finally,future challenges and prospects of MBBRs in RAS facilities that need to be considered were also proposed.

关键词： ammonia removal Biofilm carriers Sustainability Salinity Nitrogenous compound Accelerated start-up

Regenerable adsorbent for removing ammonia evolved from anaerobic reaction of animal urine

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Journal of Environmental Sciences 2006年第6期18卷 1176-1181页

作者： CHOU Liang-hsing TSAI Ru-in CHANG Jen-ray LEE Maw-tien Department of Civil and Water Resource Engineering "National" Chiayi UniversityChia-YiTaiwanChina Department of Chemical Engineering "National" Chung Cheng UniversityChia-YiTaiwanChina Department of Applied Chemistry "National" Chiayi UniversityChia-YiTaiwanChina.

The waste gas evolved from biodegradation of animal urine contains ammonia causing environmental concerns. A new and effective method for removing ammonia from such waste gas using reactive adsorption is presented. In the process, activated carbon impregnated with H2SO4（H2SO4/C） is employed. ammonia in the waste gas reacts with H2SO4 on the adsorbent instantaneously and completely to form （NIL）2SO4. The H2SO4/C adsorbent is high in NH3 adsorption capacity and regenerable. The NH3 removal capacity of this regenerable adsorbent is more than 30 times that of the adsorbents used normally in the industry. The spent H2SO4/C is regenerated by flowing low-pressure steam through the adsorbent bed to remove the （NH4）2SO4 from the adsorbent. The regeneration by-product is concentrated （NH4）2SO4 solution, which is a perfect liquid fertilizer for local use. Re-soaking the activated carbon with H2SO4 solution rejuvenates the activity of the adsorbent. Thus the H2SOJC can be reused repeatedly. In the mechanism of this reactive adsorption process, trace of H20 in the waste gas is a required, which lends itself to treating ammonia gas saturated with moisture from biodegradation of animal urine.

关键词： ammonia removal regenerable adsorbent reactive adsorption biodegradation of animal urine activated carbon

A bioaugmentation failure caused by phage infection and weak biofilm formation ability

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Journal of Environmental Sciences 2009年第8期21卷 1153-1161页

作者： FU Songzhe FAN Hongxia LIU Shuangjiang LIU Ying LIU Zhipei State Key Laboratory of Microbial Resources Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100039 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266701 China

Two biological aerated filters （BAF） were setup for ammonia removal treatment of the circulation water in a marine aquaculture. One of the BAFs was bioaugmented with a heterotrophic nitrifying bacterium, Lutimonas sp. H10, where the ammonia removal was not improved and the massive inoculation was even followed by a nitrification breakdown from day 9 to 18. The nitrification was remained stable in control BAF operated under the same conditions. Fluorescent in situ hybridization （FISH） with rRNA-targeted probes and cultivable method revealed that Lutimonas sp. H10 almost disappeared from the bioaugomented BAF within 3 d, and this was mainly due to the infection of a specific phage as revealed by flask experiment, plaque assay and transmission electron observation. Analyses of 16S rRNA gene libraries showed that bacterial groups from two reactors evolved differently and an overgrowth of protozoa was observed in the bioaugmented BAF. Therefore, phage infection and poor biofilm forming ability of the inoculated strain are the main reasons for bioaugmentation failure. In addition, grazing by protozoa of the bacteria might be the reason for the nitrification breakdown in bioaugmented BAF during day 9-18.

关键词： marine culture water circulation ammonia removal Lutimonas sp. HIO nitrification breakdown fluorescent in situhybridization （FISH）

Upgrade of three municipal wastewater treatment lagoons using a high surface area media

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Frontiers of Environmental Science & Engineering 2012年第2期6卷 288-293页

作者： John WANC Peng JINt Paul L.BISHOP Fuzhi LI Meridian Aquatic Technology LLC.4061 Powder Mill RoadSuite 100CalvertonMD 20705USA Department of Civil and Environunental Engineering University of CincinnatiCincirmatiOH 45221USA Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Lagoon-based municipal wastewater treatment plants (WWTPs) are facing difficulties meeting the needs of rapid population growth as well as the more stringent requirements of discharge permits. Three municipal WWTPs were modified using a high surface area media with upgraded fine-bubble aeration systems. Performance data collected showed very promising results in terms of five-day biochemical oxygen demand (BOD ), ammonia (NH ) and total suspended solids (TSS) removal. Two-year average ammonia effluents were 4.1 mg·L for Columbia WWTP, 4 mg·L for Larchmont WWTP and 2.1 mg·L for Laurelville WWTP, respectively. Two- year average BOD effluents were 6.8, 4.9 and 2.7 mg·L , and TSS effluents were 15.0, 9.6 and 7.5 mg·L . The systems also showed low fecal coliform (FC) levels in their effluents.

关键词： wastewater lagoons wastewater biologicaltreatment ammonia removal high surface area media,fine bubble aeration

Simultaneous nitrification and denitrification conducted by Halomonas venusta MA-ZP17-13 under low temperature conditions

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Acta Oceanologica Sinica 2021年第9期40卷 94-104页

作者： Guizhen Li Qiliang Lai Guangshan Wei Peisheng Yan Zongze Shao School of Environment Harbin Institute of TechnologyHarbin 150090China Key Laboratory of Marine Genetic Resources Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China State Key Laboratory Breeding Base of Marine Genetic Resources Xiamen 361005China Fujian Key Laboratory of Marine Genetic Resources Xiamen 361005China Sourthem Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China

Nitrification is a key step in the global nitrogen cycle.Compared with autotrophic nitrification,heterotrophic nitrification remains poorly understood.In this study,Halomonas venusta MA-ZP17-13,isolated from seawater in shrimp aquaculture (Penaeus vannamei),could simultaneously undertake nitrification and denitrification.With the initial ammonium concentration at 100 mg/L,the maximum ammonium-nitrogen removal rate reached98.7%under the optimal conditions including C/N concentration ratio at 5.95,p H at 8.93,and Na Cl at 2.33%.The corresponding average removal rate was 1.37 mg/(L·h)(according to nitrogen) in 3 d at 11.2℃.By whole genome sequencing and analysis,nitrification-and denitrification-related genes were identified,including ammonia monooxygenase,nitrate reductase,nitrite reductase,nitric oxide dioxygenase and nitric oxide synthase;while no gene encoding hydroxylamine oxidase was identified,it implied the existence of a novel nitrification pathway from hydroxylamine to nitrate.These results indicate heterotrophic bacterium H.venusta MA-ZP17-13 can undertake simultaneous nitrification and denitrification at low temperature and has potential for NH_(4)^(+)-N/NH_(3)-N removal in marine aquaculture systems.

关键词： Halomonas heterotrophic nitrification denitrification ammonia oxidization ammonia removal

ammonia-containing Wastewater Reclamation with Membrane Absorption and Vacuum Membrane Distillation

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Ammonia-containing Wastewater Reclamation with Membrane Abso...