In this study, zero-valent iron (ZVI) was produced using iron oxide that is a by-product of a pickling line at a steel works. The reaction activity of the produced ZVI was evaluated through a series of decomposition experiments of Orange II aqueous solution. The size of ZVI particles increased with reduction temperature due to coalescence. Correspondingly, the specific surface area of ZVI decreased with increasing reduction temperature. The decomposition efficiency of synthesized ZVI particles was higher at a lower pH. In particular, no significant decomposition reaction was observed at pH of 4 and higher. The rate of the ZVI-assisted decomposition of Orange II was increased by addition of H2O2 at pH of 3, whereas it was reduced by addition of H2O2 at a higher pH of 6. Nevertheless, simultaneous use of ZVI, UV and H2O2 led to a considerable increase in the decomposition rate even at a high pH condition (pH = 6).
When properly selected and applied, oil skimmers are a highly economical solution for sepaeating oil from water to allow its reuse or safe disposal.
How Oil SkimmersWorkOil skimmees are simple, dependable and effective tonis for removing oil, grease and otherhydroearbono from water and can pay for themselveo within a few months. Ah oil skimmers rely on the fluid properties of specific gravity and sorfaee tension althoogh designs mayvary. Most use a moving medium to remove floating oil Omm a liqoid surface as...
Oil skimmers are simple, dependable and effective tools for removing oil, grease and other hydrocarbuns from water. Although designs var’, ah oil skimmers rely on the fluid properties of specific gravity and surface tension. Most use a moving medium tu remove floating oil from the fluid’s surface, as shown jo Figure 1 (The exception is a floating suction skimmer.) Floating oil and grease cling tu skimming media more readily than water, and water has little affinity for the media. This alluws skimming media in the...
ABSTRACT: We have long understood and continue to improve our understanding of the geochemical conditions that favor biodegradation of petroleum hydrocarbons. Over the last several years our understanding of the conditions that are necessary for and/or promote reductive dechlorination of chlorinated hydrocarbons has improved substantially. Over this time in situ remediation technologies have proliferated. Many sites are being addressed with active remediation in conjunction with natural attenuation. For chlorinated...
For many years, the public sector has been at the forefront of the developing composting industry. For example, when biosolids composting first got started, it was the sanitation departments of municipalities and local sanitary authorities pushing projects. With yard trimmings composting, municipalities and counties were the primary entities developing programs. Even the fledgling steps of solid waste composting were the result of hand holding by public agencies. Food residuals composting, however, breaks the...
An environmental audit of Australian National Railways` facilities in various States identified a serious problem with the performance of wastewater and effluent treatment systems at several sites. Implementation of cleaner production measures has resulted in improved environmental performance and cleaning efficiencies at reduced operational cost.
Background
In late 1995, Australian National Railways (ANR) commissioned consultants to undertake a program of environmental audits of its locomotive maintenance...
It is a common question asked every day by people in all fields of industry. Machine shops, steel mills, industrial manufacturers, and many others are faced with the problem of removing oils from coolants and wastewater on an everyday basis. They are faced with high disposal and maintenance costs. Some manufacturers are charged extreme amounts to have their contaminated water treated properly by their local water treatment facility.
Companies look for effective ways to remove the oil from their wastewater or...
Unidrive Pty Ltd undertake extensive machining operations during the production of automotive components. In the past this resulted in the generation of 20,000 litres of waste coolant every week. By implementing a coolant recovery and recycling system, Unidrive have saved approximately $179,000 per annum as a result of more efficient coolant usage and management.
Background
Unidrive Pty Ltd was established in the late 1950s and currently has a workforce of over 400. It manufactures drive assemblies and other...
Introduction
Solidification/stabilization (S/S) reduces the mobility of hazardous substances and contaminants in the environment through both physical and chemical means. Unlike other remedial technologies, S/S seeks to trap or immobilize contaminants within their `host` medium (i.e., the soil, sand, and/or building materials that contain them), instead of removing them through chemical or physical treatment. Leachability testing is typically performed to measure the immobilization of contaminants. S/S techniques...
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