The use of water treatment plant sludge ash as a mineral addition (original) (raw)
Related papers
Environmental evaluation of concrete with sewage sludge ash based on LCA
Sustainable Production and Consumption, 2018
Using sewage sludge ash (SSA) as a substitute for part of cement in concrete provides environmental, social and economic benefits with the aim of achieving basic sustainability principles. The potential environmental benefits from using SSA as a supplementary cementitious material have been investigated and quantified by life cycle assessment (LCA) model on a concrete example. Controlled combustion of sewage sludge collected in Croatia from wastewater treatment plant (WWTP) Zagreb produced SSA that was used to substitute for cement in concrete production. The paper compares environmental impacts of production of ordinary concrete and landfilling of SSA with the production of ''green'' SSAconcrete where the need for additional SSA disposal in non-hazardous landfills is eliminated. The results presented indicate that 10% replacement of cement by SSA produces concrete of the same technical and environmental characteristics as the reference (no any significant changes in compressive and flexural strengths, maximum water penetration depth, total shrinkage and total leaching concentrations of selected heavy metals, while increased water requirements and reduced workability was overcome by higher amount of used superplasticizer). At the same time this resulted in 9% lower environmental impacts expressed as global warming potential (GWP) in kg CO 2 eq. In the case of redirecting the total amount of SSA, that would be generated on this WWTP, in the concrete industry, it is possible to expect annual reduction in the global warming potential of more than 10 million kg CO 2 eq. Presented research has a potential for reducing greenhouse gas emissions and helping to conserve non-renewable natural resources, but also reducing the amount of waste that is landfilled, where there are benefits for both, cement and concrete industry, as well as for the industry of wastewater treatment.
Use of sludge generated at WWTP in the production of cement mortar and concrete
Građevinar, 2016
Problems relating to disposal of sludge accumulating at waste-water treatment plants (WWTP) in Croatia are described in the paper. The possibility and adequacy of using ash obtained through incineration of sludge is considered. A special emphasis is placed on the significance of ash in concrete industry during production of cement mortar and concrete. Results of worldwide research conducted so far are described, with indications about the ways in which ash use influences properties of cement mortar and concrete.
The problem of Egyptian agricultural land is the production of Rice Husk Ash (RHA) with a huge amount and nothing made to reuse of it that made a lot of environmental problems. The average quantity of RHA produced in Egypt annually ~6 million ton and only 17% of it reused and the rest burnt causing a significant environmental problem. On the other hand, a lot of new water treatments plants (WTP) came into work producing many sludge quantities. The reuse of the sludge will reduce the burden on the environment. The competence of using the sludge generated from WTP and the RHA produced from agricultural waste was investigated in the production of concrete. Several mixes were created to check application suitability for RHA and sludge and to determine the product best application. Concrete mixes were produced with different mixing ratios of burnt RHA and sludge ash between 0 % and 30% as a cement replacement. 10% RHA cement replacement gave a very near 28 days compressive and tensile st...
REUSE OF WATER TREATMENT PLANT SLUDGE AND RICE HUSK ASH IN CONCRETE PRODUCTION
The problem of Egyptian agricultural land is the production of Rice Husk Ash (RHA) with a huge amount and nothing made to reuse of it that made a lot of environmental problems. The average quantity of RHA produced in Egypt annually ~6 million ton and only 17% of it reused and the rest burnt causing a significant environmental problem. On the other hand, a lot of new water treatments plants (WTP) came into work producing many sludge quantities. The reuse of the sludge will reduce the burden on the environment. The competence of using the sludge generated from WTP and the RHA produced from agricultural waste was investigated in the production of concrete. Several mixes were created to check application suitability for RHA and sludge and to determine the product best application. Concrete mixes were produced with different mixing ratios of burnt RHA and sludge ash between 0 % and 30% as a cement replacement. 10% RHA cement replacement gave a very near 28 days compressive and tensile strength values to control concrete specimens. The 20% RHA replacement using dolomite as coarse aggregate attained the minimum limit for structural concrete. 10% of sludge ash replacement for the higher grades of concrete (400 kg/m3 cement content) and by using the dolomite as coarse aggregate gave suitable properties to use as structural concrete. More than 10% sludge ash replacement ratios may be suitable to use in other types of architectural concrete. Increasing cement replacement ratio slightly decreases the water absorption of RHA specimens while for sludge ash specimens, as the percentage of sludge ash increases, water absorption values of concrete samples steadily increases.
Use of Sewage Sludge Ash as a Cement Replacement in Concrete: A Review
2020
Rapid development of the countries in the world and increase in population will increase the production of sewage sludge. Sewage sludge is a waste product from the sewage treatment plant processes. The sewage treatment plants are processing large volume of wastewater every day in order to control the quality of the effluent before released to the river. Instead of disposing the sewage sludge at landfill, using sewage sludge as a recycle material could minimize the need for new disposal area and reduce the negative impact to the environment. Thus, many studies have been conducted to utilize the sewage sludge ash as a recycle material. This paper reviews the usage of sewage sludge ash as cement replacement in concrete production. Sewage sludge ash is a powdered material that contains high percentage of SiO2, Al2O3, Fe2O3, CaO, P2O5 and SO3, and has shown moderate reactivity in terms of pozzolanicity. Most of the researchers burned the sewage sludge to the temperature range between 60...
The Use of Sewage Sludge Ash (Ssa) as Partial Replacement of Cement in Concrete
2015
The production of sewage sludge from waste water treatment plant is increasing all over the world. Disposal of sewage sludge is becoming a serious environmental problem. Another alarming issue is attributed to the high usage of concrete in the construction industry where concrete is one of its main material. This will lead to increased cement production and emission of carbon dioxide because the cement industry one of the major contributor of carbon dioxide emission. Hence, the research for replacement of cement by sewage sludge ash is essential to reduce both the emissions of carbon dioxide and the disposal problem of sewage sludge ash. An attempt has been made to investigate the use of sewage sludge ash as partial cement replacement in concrete. The sewage sludge is incinerated at the temperature of 600°C and a duration of 3 hours. The incinerated sewage sludge ash is sieved through size of 150 µm. Four different percentages of 5%, 10%, 15% and 20% of sewage sludge ash (SSA) is us...
Use of sewage sludge ash in cementitious materials
Reviews on Advanced Materials Science, 2017
The potential for using sewage sludge ash (SSA) in cement mortars and concrete is reviewed. The chemical and physical properties and pozzolanic activity of a range of different incinerated SSA samples indicates the potential to exploit the pozzolanic properties of this waste as a supplementary cementitious material (SCM). Using SSA as a SCM increases the water demand and reduces the workability, compressive strength and density of concrete mixes, although these adverse effects may be controlled by modifying the mix design. This represents a beneficial reuse application for a waste that is typically landfilled. However the use of SSA in cementitious materials must be carefully controlled because SSA varies significantly, depending on sludge production method and combustion conditions. Testing will therefore always be required to assess how a specific SSA behaves when incorporated in cementitious materials.
Potential use of UK sewage sludge ash in cement-based concrete
Proceedings of the ICE - Waste and Resource Management, 2012
Sewage sludge ash (SSA) arises as a by-product of the treatment of wastewater by combustion and has been identified for potential use in various construction products, such as brick manufacture, artificial aggregate and cement replacement in concrete. This paper reports on research that looked at replacing the cement or fine aggregate fraction in concretes with SSA from three UK wastewater plants. The first phase of the study established whether the physical and chemical properties of SSA were suitable for use in concrete. The potential reactivity of the material, when used as a cement replacement, was assessed for mortar specimens. In the second phase, SSA was used as a cement replacement in structural grade concrete and as a fine aggregate in foamed concrete. The overall findings of the study were that although the chemical properties of SSA indicated that it had limited reactive abilities, the porous and friable nature of SSA was such that it masked any strength development in conventional concrete and may require further processing to be used effectively. However, this characteristic was a benefit when used as a fine aggregate in foamed concrete, as it enhanced the thermal properties of the concrete by more than a third.
Sludge Use in Concrete as a Replacement of Cement
Sludge is an unavoidable product of wastewater treatment that creates problems of disposal. Increasingly, strict environmental control regulations have resulted in limitations on sludge disposal options. Disposal by incineration has been found to be a good option. In this research, application of waste sludge were collected from sewage treatment plant (STP) Nashik was used as cement replacement in concrete mix. This study utilized replacement of 5%, 10 %, 15 % and 20% by weight of OPC with water binder (w/c) ratio of 0.50 and 0.45 for Grade 20 and Grade 30 respectively. The performance of sludge concrete in terms of its compressive strength, split tensile strength test, flexure strength test were investigated. All values of compressive strength for sludge concrete were lower compared to the OPC control, and the strength decreased as the percentage of replacement with sludge increased for Grade 20 and Grade 30, at replacement of 10 %. Meanwhile, water absorption and water permeability for the sludge concrete increased as the replacement increased. Overall, with further research in producing quality, the potential of using this waste as a cement replacement material is very promising. Keywords: Waste Sludge, F.A-Fine Aggregate, C.A.-Coarse Aggregate compressive strength, flexure strength test split tensile strength test Rapid chloride Ion penetration.
Sewage sludge ash characteristics and potential for use in concrete
Construction and Building Materials, 2015
Sewage Sludge Ash (SSA) use in concrete related applications is assessed through systematic review involving analysis and evaluation of the global literature found published since 1983. The material characteristics indicate potential for various applications: in small dosages as raw feed in Portland cement production, as fine and filler aggregates, or in ground form as cement component, with manageable effects on performance. Using manufactured SSA aggregate, concrete strength suitable for structural applications and lightweight properties comparable to Leca are attainable. SSA can be used in bulk, in controlled low strength materials (CLSM), aerated and foamed concretes. Reported case studies give encouraging signals.