Abstract:
:This study aimed to investigate factors that affect the conversion of sulphates and magnesium, and the recovery of gypsum and magnesium hydroxide in the neutralization of a sulphate rich stream using calcium hydroxide, in a laboratory scale seeded fluidised bed crystallizer. Particular focus was on reducing the precipitated fines that escaped with the treated water, through the use of seeds, while removing as much sulphate-compounds from the waste stream as possible. The composition of the total sulphate salts was as follows: 80% magnesium sulphate, calcium sulphate remaining at its saturation concentration (1.5 g/L), with the remainder being sodium sulphate based on typical reverse osmosis retentate concentrations ranging from 1.5 - 120 g/L of total sulphate salts. The fluidised bed crystallizer, using silica seeds, was found to be effective at reducing the formation of gypsum and magnesium hydroxide fines by almost half. Feed concentrations of 35 g/L of total salts yielded better sulphate conversions (±75%), compared to a feed concentration of 8 g/L (±30%). It was possible to remove 99% of the magnesium in the saline wastewater stream using a calcium to sulphate ratio of 1:1 for feed concentrations of 15 g/L and higher. Excess calcium hydroxide suspension improved sulphate conversions.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Maharaj C,Chivavava J,Lewis Adoi
10.1016/j.jenvman.2017.09.061subject
Has Abstractpub_date
2018-02-01 00:00:00pages
378-386eissn
0301-4797issn
1095-8630pii
S0301-4797(17)30930-1journal_volume
207pub_type
杂志文章abstract::Nitrogen contamination of groundwater has become a global issue and has aroused considerable concern among authorities. However, it is difficult to trace nitrogen sources in settings where a municipal solid waste (MSW) landfill site co-exists with intensive agriculture and other human activities. Therefore, a field in...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.110661
更新日期:2020-08-15 00:00:00
abstract::Mowing is a widely used practice for haymaking in the semi-arid grassland of northern China. Yet, how it impacts above- and belowground biota and ultimately affects the grassland ecosystem is unclear. Here we address this question by investigating the effects of three mowing regimes (no mowing, mowing once per year, m...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.111441
更新日期:2021-01-01 00:00:00
abstract::Controversy between alternative uses of forests in Finnish Upper Lapland has been going on for decades, and in recent years it has been escalated to a serious conflict. The core of the conflict is the adverse impacts of forestry on old forests which are important grazing areas for reindeer and which are regarded as in...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2011.01.007
更新日期:2011-06-01 00:00:00
abstract::An acid-recovering nanofiltration (NF) membrane with both acid resistance and selective acid permeability was fabricated via a water-based coating process for the recovery of hydrochloric acid. To achieve this, a thermally cross-linked branched-polyethyleneimine (b-PEI) layer was introduced to a loose polyethersulfone...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.110001
更新日期:2020-04-15 00:00:00
abstract::Sub-aerial biofilm (SAB) development on solar panels was studied in São Paulo. After 6, 12 and 18 months' exposure, photovoltaic panels were covered by increasing proportions of organic matter (42%, 53% and 58%, respectively). Fungi were an important component of these biofilms; very few phototrophs were found. Major ...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2015.03.050
更新日期:2015-07-01 00:00:00
abstract::Removal of mercury from aqueous solutions using activated carbon prepared from Ceiba pentandra hulls, Phaseolus aureus hulls and Cicer arietinum waste was investigated. The influence of various parameters such as effect of pH, contact time, initial metal ion concentration and adsorbent dose for the removal of mercury ...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2007.12.019
更新日期:2009-01-01 00:00:00
abstract::The potential of devolved conservation to empower people, reduce poverty and protect forest resources has yet to be realized in much of the developing world. This is particularly evident in the Philippines where the central state paradoxically recentralizes political power through devolution at the policy, program and...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2009.08.007
更新日期:2009-10-01 00:00:00
abstract::The present article reports the treatment of resorcinol using a catalytic wet peroxidation (CWPO) process in the presence of copper impregnated granular activated carbon (Cu/GAC) with a bench-scale batch reactor. The typical physico-chemical properties of synthesized catalyst were characterized with different equipmen...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2018.06.093
更新日期:2018-10-01 00:00:00
abstract::A surprising number of U.S. cities have drinking water with unhealthy levels of chemicals and contaminants. The city of Jacksonville (Florida), the location for this study, owns the dubious distinction of being ranked among the worst major American cities in water quality according to water quality tests conducted bet...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2017.08.008
更新日期:2017-12-01 00:00:00
abstract::The occurrence and spatio-temporal patterns of five tetracyclines (TCs) and six of their degradation products were investigated in twenty-eight drinking water sources along the lower Yangtze River (LYR) over dry, normal and flood seasons. Tetracycline (TC), oxytetracycline (OTC) and doxytetracycline (DXC) were the dom...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.04.070
更新日期:2019-08-15 00:00:00
abstract::To elucidate the effect of structure and property of biochar on the structure-activity relationship among the composites of biochar supported Pd/Fe and 1,2,4-trichlorobenzene (1,2,4-TCB) and its dechlorination products, biochar supported Pd/Fe nanoparticles with different mass ratios were investigated for the enhanced...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.05.079
更新日期:2019-09-01 00:00:00
abstract::Arable land in China has been decreasing as a result of rapid population growth and economic development as well as urban expansion, especially in developed regions around cities where quality farmland quickly disappears. This paper analyzed changes in arable land utilization during 1993-2008 in the Pinggu district, B...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2013.05.020
更新日期:2013-10-15 00:00:00
abstract::More than two thirds of large rivers worldwide are fragmented, threatening freshwater biodiversity, river integrity, and the services that freshwater ecosystems provide for human populations around the globe. In an effort to alleviate the impacts of barriers, engineered solutions have been developed, though with somew...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.110408
更新日期:2020-06-15 00:00:00
abstract::The use of turbidity for indicating environmentally detrimental levels of suspended and colloidal matter in freshwater systems, and for defining acceptable water quality standards in national and European drinking water regulations, is well established. Turbidity is therefore frequently adopted as a surrogate for susp...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2017.05.017
更新日期:2017-09-01 00:00:00
abstract::Understanding spatial patterns of forest fire is of key important for fire danger management and ecological implication. This aim of this study was to propose a new machine learning methodology for analyzing and predicting spatial patterns of forest fire danger with a case study of tropical forest fire at Lao Cai prov...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.01.108
更新日期:2019-05-01 00:00:00
abstract::Carbamazepine is an antiepileptic drug that can be used as a marker for the cleaning efficiency of wastewater treatment plants. Here, we present the optimization of a fast and easy on-site measurement system based on fluorescence polarization immunoassay and the successful application to wastewater. A new monoclonal h...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2017.01.063
更新日期:2017-05-15 00:00:00
abstract::The population growth patterns of four cladocerans, viz. Alona rectangula, Ceriodaphnia dubia, Moina macrocopa and Daphnia pulex on wastewaters from a treatment plant at Iztacalco, Mexico City were analyzed in this study. Crude wastewater (tank A) did not support A. rectangula and all animals in the replicates died af...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2004.02.001
更新日期:2004-05-01 00:00:00
abstract::Surveillance for invasive non-indigenous species (NIS) is an integral part of a quarantine system. Estimating the efficiency of a surveillance strategy relies on many uncertain parameters estimated by experts, such as the efficiency of its components in face of the specific NIS, the ability of the NIS to inhabit diffe...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2009.03.011
更新日期:2009-06-01 00:00:00
abstract::Agro-industrial byproducts, especially rice straw, are potential resources. This work was aimed to utilize raw materials to produce value-added biosurfactant in solid-state fermentation (SSF). Rice straw and soybean flour were found efficient and selected as major substrates for surfactin production. The results of Pl...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2013.04.017
更新日期:2013-09-30 00:00:00
abstract::Guangzhou city in South China has experienced an accelerated urban development since the 1980s. This paper examines the impact of the urban development on urban heat islands through a historical analysis of urban-rural air temperature differences. Remote sensing techniques were applied to derive information on land us...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2003.11.006
更新日期:2004-02-01 00:00:00
abstract::Water separation and recovery through thickening require adapted flocculants and densification processes. This study aimed to maximize water recovery from phosphate sludge (PS) at Kef Shfeir mine operation, Gafsa Phosphate Company, Tunisia. Representative samples of PS, PS treated with flocculant (F-PS), raw water, an...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.109801
更新日期:2020-01-15 00:00:00
abstract::To verify how does the development of technological innovation effectively mitigate carbon dioxide (CO2) emissions in Organization for Economic Co-operation and Development (OECD) countries, this study first investigates the direct impacts and moderating effects of technological innovation, measured by the development...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.111818
更新日期:2021-02-15 00:00:00
abstract::This paper presents a system of Sustainable Tourism Tags to evaluate the management of tourist destinations, using the information from a composite indicator called the Differential Dynamic Index. This vectorial indicator has two components: one dynamic which shows the advance or regress in time of each destination in...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2019.109458
更新日期:2019-11-15 00:00:00
abstract::Phosphorous (P) fertigation with high salinity water (HSW) drip irrigation would be an effective measure to relieve soil and water pollution caused by the excessive application of P fertilizer, and achieve synergistic saving of both limited fresh water and non-renewable P resources. However, the emitter clogging issue...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.110366
更新日期:2020-06-01 00:00:00
abstract::The potential of algal-bacterial symbiosis for off-gas abatement was investigated for the first time by comparatively evaluating the performance of a bacterial (CB) and an algal-bacterial (PB) airlift bioreactors during the treatment of a 6 g m-3 toluene laden air emission. The influence of biomass concentration and o...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2016.09.016
更新日期:2016-12-01 00:00:00
abstract::Mesoporous activated carbon was prepared using a hydrochar derived from coconut shell waste through hydrothermal carbonization and NaOH chemical activation process (COSHTC). Three sets of activated carbons were obtained with different hydrochar:NaOH impregnation ratios (1:1, 1:2, and 1:3). Among these ratios, 1:3 (COS...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2017.07.029
更新日期:2017-12-01 00:00:00
abstract::Current microalgal based photobioreactors focus on the secondary treated effluent while limited researches attempted for treating the raw domestic wastewater. This study aimed to assess the microalgal biomass production, removal performance, and fouling characteristics of microalgal membrane bioreactors (MMBRs) for tr...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2020.111548
更新日期:2021-01-15 00:00:00
abstract::The Murcia Este Wastewater Treatment Plant is the largest wastewater treatment plant in Murcia (Spain). The plant operators have continuously found pipe blockage and accumulation of solids on equipment surfaces during the anaerobic digestion and post-digestion processes. This work studies the precipitation problems in...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2008.02.001
更新日期:2009-02-01 00:00:00
abstract::A protocol was developed with the purpose of assessing the main costs implied in the set-up, operation and maintenance of a waste gas-treating conventional biofilter. The main operating parameters considered in the protocol were the empty bed residence time and the gas flow rate. A wide variety of investment and opera...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2009.01.022
更新日期:2009-06-01 00:00:00
abstract::Migration of heavy metals into aquatic environments has become a concern in some regions of the world. Many wood preservatives are copper based systems that have the potential to migrate from the wood and into the surrounding environment. Some wood treaters have developed "best management practices" (BMPs) that are de...
journal_title:Journal of environmental management
pub_type: 杂志文章
doi:10.1016/j.jenvman.2015.02.001
更新日期:2015-04-01 00:00:00