Derwen construction commissions a new washing plant for aggregates
Courtesy of CDEnviro
Derwen Construction and the Wales Environment Trust.
Derwen Construction was established in 1993 as a civil engineering company, however three years ago, when they began to find it difficult to find landfill sites for the inert waste generated on their sites, they decided to become self sufficient and set up a recycling plant, which is based at Neath Abbey Wharf.
Derwen Construction originally recycled soils, green waste compost and general fills for the construction industry; however they have recently completed a GBP2.8 million venture to wash excavated inert waste to produce aggregates to various specifications.
With help from the Trust, they have been offered an AIG grant of GBP75,000; which they have accepted despite the difficult restrictions imposed.
The new plant which was commissioned in late December 2006 has the capacity to process 350,000 tonnes per annum of excavated waste from construction sites. The plant washes and screens the inert waste to produce fine and sharp sand, 5 - 10 mm aggregate and 10 – 20 mm aggregate. The oversize material which is 20 – 90 mm is either crushed to manufacture Granular Sub Base Type 1, or used in variety of other products, such as drainage materials.
The original recycling plant continues to recycle soils, green waste compost and general fills processed from construction and demolition waste. Both these plants now have the capacity to process up to 500,000 tonnes per annum from the site.
Derwen Construction is currently investigating some exciting new markets for their washed aggregates and the -63micron filter cake.
An environmental oriented model for optimum cut-off grades in open pit mining projects to minimize ...
Environmental concerns on mining activities started near the end of the 20th century and is still underway. Due to mining activities, the adverse environmental impact has been significant throughout the history of mankind, whereas the minerals produced by mining activities have been providing the basis for human civilization. The legacy of past mining practices is large quantities of acid generating waste materials and tailings that caused abounding acid mine drainage problems. Modern mining environmental managemen...
Crowder-Gulf Disaster Debris Management Responds to Hurricanes’ Havoc
Untitled Document Bonnie...Charley...Frances...Ivan. If the state of Florida could be compared to a fictional prize fighter. It would have to be called Rocky. The series of blows it has sustained should have flattened it. Instead, like its fictional counterpart, it has rebounded and fought back...thanks in large part to a man named Jimmie Crowder, head of Crowder Excavating, Inc. in Tallahassee. Even though there are currently over 30 counties and numerous cities ranging throughout the state...
Review of Selected Waste Streams: Sewage Sludge, Construction and Demolition Waste, Waste Oils, ...
Five waste streams are reviewed in this technical report: sewage sludge, construction and demolition waste, waste oils, waste from coal-fired power plants and biodegradable municipal waste. The review focuses on the quantities of wastes produced and on systems used to collect and treat them in several European countries and regions.
Bioenergy and Biofertilizer- Improvement of Biogas Production From Filter Cake
Abstract In the present paper some results of a study carried out on the anaerobic digestion of Sugar Mill Filter Cake (SMFC), use of natural zeolite to intensify the biogas production, as well as the use of the digestion mud, in biofertilizer quality are presented. The method allows obtaining increments of biogas production in the range of 20-40 %. It was shown that application of the mud containing the added doses of stimulator, far from causing any affectation, facilitates to obtain a significant improvement...
Construction and Demolition Waste Management Practices and their Economic Impacts
The European Commission has funded a report called `Construction and demolition waste management practices and their economic impacts`. The project was undertaken by SYMONDS GROUP (United Kingdom) in association with ARGUS (Germany), COWI Consulting Engineers and Planners (Denmark) and PRC Bouwcentrum (the Netherlands). Basic aim of the project was to investigate the quantities of construction and demolition waste (CDW) among the European Union as well as the measures, which each Member States has taken to...
Potential applications of lignocellulose-decaying fungi in waste treatment
Lignocellulose of plant biomass represents the greatest pool of organic carbon on earth. Basidiomyceteous fungi capable of causing different kinds of lignocellulose decay are important biomass recyclers, thereby transforming lignocellulose of plant biomass into soil humus matter. In these organisms, this is done by an extracellular machinery which generates different kinds of strong oxidants, including organic radicals, different species of activated oxygen, as well as highly reactive oxidation states of certain...
Backyard Composting Evaluated in New York City
Diversion data following distribution of bins indicate that home composting probably won’t make a significant dent in New York City’s waste stream, but can more than pay its way and boost recycling awareness. New York City may not normally be associated with yards and gardens, but there are good reasons to study backyard composting’s effect on waste diversion, especially because the impending closure of the city’s last landfill in 2001 means that nearly 12,000 tons/day of residential waste will have to be...
Cart-Based Organics Collection. Citizens Drive 65 Percent Diversion System
For better or worse, citizens opposing waste management projects usually end up being labeled as NIMBYs — not in my backyard. This could have been the case in Halifax, Nova Scotia but instead, the citizens took their opposition one step further, basically taking the design for an acceptable waste management system into their own hands. In the process, they laid out the foundation for an integrated strategy for the four municipalities that now make up the Halifax Regional Municipality (HRM) that was adopted and...
Composters Build Strong Links to California Farms
The rapidly increasing amounts of compost applied to California farms can be traced to numerous factors — better crops, fewer disease problems, greater emphasis on product quality, mandated state recycling goals, savings in disposal costs and savings in chemical inputs. And then there’s the factor of friendship, longtime personal relationships that build trust between composters and farm managers. All these reasons surfaced in a series of interviews with individuals in charge of organics recycling and farming...
University and Company Team Up for Composting and Recycling
Sodexho Marriott Services is a food and facilities management company that operates in the corporate, health care and education markets. Its expertise is rooted in areas such as meals, landscaping, housekeeping, plant operations, etc. But for the past several years, the company has teamed up with New Mexico State University (NMSU) to run a campus composting and recycling program that utilizes advantages of both the corporate and collegiate worlds. Started in July, 1994, the cooperative solid waste management...
A new Technology for Composting: Suction Aeration for Opening Composting Works
Cost-efficient solution for smell emission reduction The enormous waste quantities that are produced day by day are one of the most difficult problems for the economy as such, for cities and communities and for private households. Storage capacities for waste are scarce everywhere. Therefore solutions of all kinds that reduce waste quantities or recycle waste materials to be reused in the material cycle are top priority for all concerned. For some time now, compost production has been a widely used approach to...
Baseline Projections of Selected Waste Streams
Abstract Waste represents an enormous loss of resources both in the form of materials and energy. Indeed, quantities of waste can be seen as an indicator of the material efficiency of society. Waste generation is increasing in the European Union, and amounted to about 3.5 tonnes of solid waste per person in 1995 (excluding agricultural waste) 1 Excessive quantities of waste result from: inefficient production processes low durability of goods unsustainable consumption patterns. Solid waste is also increasingly...
Deconstruction Fits the Bill for Businesses
While deconstruction has become a hot topic in the recycling and demolition industries lately, it is anything but a new discovery. Salvaging materials from buildings has been going on for a very long time. Just a few decades ago, some demolition contractors only did hand wrecking of buildings, selling the reusable materials. As construction firms’ interest in speed overshadowed the value of materials that could be recovered, deconstruction was pushed into the background. But the concept never totally disappeared....
Coal Mining and Production Industry - Pollution Prevention Guidelines
Introduction Pollution Prevention Guidelines to provide technical advice and guidance to staff and consultants involved in pollution-related projects. The guidelines represent state-of-the-art thinking on how to reduce pollution emissions from the production process. In many cases, the guidelines provide numerical targets for reducing pollution, as well as maximum emissions levels that are normally achievable through a combination of cleaner production and end-of-pipe treatment. The guidelines are designed to...
All Waste is not created equal
If you live in a house, apartment or similar abode, you produce waste. Right? You probably can`t go a week without producing waste. All kinds of waste. Call it trash if you want. It`s still waste. And if you don`t live where recycling is mandatory or there is no outlet for your voluntary environmental tendencies, everything goes into the trash - bottles, cans, cardboard, plastics, bottle caps, paint cans, light bulbs, fluorescent lamps, camera and flashlight batteries, pesticide bottles, pressurized spray cans,...
Mercury Emissions From The Disposal of Fluorescent Lamps
The Environmental Protection Agency (EPA) is making available to the public a study containing information relating to its Proposed Rule addressing the management of mercury-containing lamps under the Resource Conservation and Recovery Act Subtitle C hazardous waste management system published in the Federal Register on July 27, 1994, 59 FR 39288. The study consists of an electronic model and report that provides an assessment of mercury emissions from the management of mercury-containing lamps under different...
Common Treatment Technologies for Halogenated SVOCs in Soil, Sediment, and Sludge
Common treatment technologies for halogenated SVOCs in soil, sediment, and sludge include biodegradation, dehalogenation, incineration, and excavation with off-site disposal. All types of biodegradation, both in situ or ex situ, can be considered to remediate soils: in situ bioremediation, bioventing, composting, controlled solid phase, or landfarming. Slurry phase biological treatment is also applicable but is less widely used. Treatability studies should be conducted to evaluate design parameters, such as...
Common Treatment Technologies for Radionuclides in Soil, Sediment, and Sludge
Unlike organic contaminants (and similar to metals), radionuclides cannot be destroyed or degraded; therefore, remediation technologies applicable to radionuclides involve separation, concentration/volume reduction, and/or immobilization. The most commonly used treatment technology for radionuclides in soil, sediment, and sludge is solidification/stabilization (S/S). This treatment technology is described briefly below. Solidification processes produce monolithic blocks of waste with high structural integrity....
Containment for Soil, Sediment, and Sludge
Containment treatments are often performed to prevent, or significantly reduce, the migration of contaminants in soils or ground water. Containment is necessary whenever contaminated materials are to be buried or left in place at a site. In general, containment is performed when extensive subsurface contamination at a site precludes excavation and removal of wastes because of potential hazards, unrealistic cost, or lack of adequate treatment technologies. Containment treatments offer quick installation times and...
Ex Situ Thermal Treatment for Soil, Sediment, and Sludge
The main advantage of ex situ treatments is that they generally require shorter time periods, and there is more certainty about the uniformity of treatment because of the ability to screen, homogenize, and continuously mix the soils. Ex situ processes, however, require excavation of soils leading to increased costs and engineering for equipment, possible permitting, and materials handling worker safety issues. Thermal treatments offer quick cleanup times but are typically the most costly treatment group. This...
Comparative Risk Assessment
` Comparative risk assessment provides a systematic way to compare environmental problems that pose different types and degrees of health risk. It combines information on the inherent hazards of pollutants, exposure levels and population characteristics to predict the resulting health effects. Using data from available sources, rapid, inexpensive comparative risk assessments can identify the most significant health problems. Together with consideration of costs, technical feasibility and other factors, the...
Other Treatment Technologies
Reuse/Recycle: Recovery and reuse technologies for energetic materials, including both explosives and propellants, should be considered at explosives waste sites for several reasons. First, new recovery methods and potential uses for reclaimed explosive materials are rapidly developing. Second, recovery/reuse options reduce overall remediation costs by eliminating destruction costs and allowing the value of reclaimed materials to be recovered. Finally, EPA`s treatment hierarchy, which is based on environmental...
A Citizen`s Guide to Chemical Dehalogenation
What is chemical dehalogenation? Chemical dehalogenation is a chemical process to remove halogens (usually chlorine) from a chemical contaminant, rendering it less hazardous. Halogens are a class of chemical elements that include chlorine, bromine, iodine, and fluorine. Polychlorinated biphenyls are halogenated compounds that once were used in high voltage electrical transformers because they conducted heat well while being fire resistant and good electrical insulators. In addition, halogenated compounds are used...
The Waste Minimation National Plan
Executive Summary The U.S. Environmental Protection Agency (EPA) is committed to making pollution prevention the guiding principle of the Agency`s environmental efforts. The 1984 Amendments to the Resource Conservation and Recovery Act and the 1990 Pollution Prevention Act set in policy the preference for source reduction over waste management. EPA is reaffirming this commitment. With the release of the Waste Minimization National Plan on November 18, 1994, EPA outlines its major goals, objectives, and action...
Quantity of Fines Produced During Crushing, Handling, and Placement of Roadway Aggregates
A three part test procedure was developed to determine the quantity of fines produced during crushing, handling, and placement of aggregates used as base course in roadway construction. The first test simulates crushing at the aggregate source. It involves processing an aggregate sample of specified gradation through a small laboratory jaw crusher. The second test simulates handling by agitating an aggregate sample of specified gradation at 10% moisture content for 20 min. The modified American Association of...