Showing papers by "Simon J. Judd published in 2001"
TL;DR: It is concluded that coagulation with downstream microfiltration offers a cost-effective means of removing natural organic matter, achieving a THMFP removal of around 80% at the optimum dose.
159 citations
TL;DR: The data indicate that the impact of understanding microbial processes and the nutrients required for wastewater treatment can only serve to optimise process efficiency for the proposed treatment of greywater.
123 citations
TL;DR: The MBR process complied with commonly adopted water recycling quality standards for the all determinants during the grey water trials and failed only in terms of total coliform counts once black water had been introduced into the feed.
83 citations
TL;DR: In this paper, the feasibility of a submerged MBR fitted with three pore-sized non-woven poly-propylene (NWPP) membranes has been studied, and the performance was compared with that of a conventional polysulfone (PS) membrane material.
55 citations
TL;DR: In this article, the authors investigated the kinetics of reductive degradation of two different azo dyes by zero-valent iron in aqueous solution using a laboratory-scale slurry reactor system.
41 citations
TL;DR: Water recycling in the form of rain, grey or black water is becoming an important element of demand-management practice in the UK, and appropriate technology allows the use of three different water sources for similar applications as mentioned in this paper.
Abstract: Urban water recycling in the form of rain, grey or black water is becoming an important element of demand-management practice in the UK, and appropriate technology allows the use of three different water sources for similar applications. The level of pollution in the water source and the application to which it is being recycled, dictate the level of technology which is used. This paper describes current water re-use practices in the UK (in terms of water source, technology scale, type and efficiency) and examines five case studies. Of more than 150 schemes identified, most are rainwater-collection systems and these are generally sited in rural areas. There are various single-house greywater recycling sites, many of which are part of water company or Environment Agency monitoring programmes. Larger-scale schemes employ both natural and hi-tech treatment options. Operationally successful schemes utilise appropriate technology for the end-use, although the economic benefits of many of the schemes are poor.
35 citations
TL;DR: The impact of introducing ‘slug’ flow into a tubular ‘in-to-out’ membrane bio-reactor is discussed and data are presented from both a theoretical hydrodynamic model of slug flow through a tube, and from a practical experiment which incorporates submerged and cross-flow membrane elements.
19 citations
TL;DR: In this article, azo dye acid orange II ORP was found to follow the same trend as the dye concentration ([AOII]), decreasing exponentially with time over the course of the remediation, indicating a Nernstian behaviour.
Abstract: Oxidation reduction potential (ORP) changes were monitored during the course of the remediation of four wastewater matrices by metallic iron (Fe0) based on a batch fluidized bed reactor. Two of these matrices contained azo dyes (Acid Orange II and Acid Blue 113), another contained pentachlorophenol and the fourth was an authentic dyewaste. For the azo dye Acid Orange II ORP was found to follow the same trend as the dye concentration ([AOII]), decreasing exponentially with time over the course of the remediation. Change in ORP was found to be directly proportional to [AOII] and to follow a logarithmic relationship with [Fe2+]2[aa]2[AOII]−1, indicating a Nernstian behaviour. It is concluded that the ratio of remediation products to reactants can be determined directly by monitoring changes in ORP. The electrochemical conditions that influence corrosion were found to control remediation, consistent with the remediation being driven by anaerobic corrosion and predicted from potential–pH Pourbaix diagrams.
10 citations
TL;DR: An absorption process based on a non-wetted hollow fibre membrane for the scrubbing of hydrogen sulphide from air, with water as the contact solvent suggests that, as expected, very efficient mass transfer is obtained.
4 citations
TL;DR: The efficacy of ultrafiltration and microfiltration membranes was assessed for the concentration of actual waterworks sludges using crossflow tubular membranes operated at constant trans-membrane pressure to demonstrate reasonable agreement with the expression R ∝ c a.
Abstract: The efficacy of ultrafiltration (UF) and microfiltration (MF) membranes was assessed for the concentration of actual waterworks sludges using crossflow tubular membranes operated at constant trans-membrane pressure. The MF membrane gave higher initial fluxes than the UF membrane but after 10 min of filtration the flux value and its decline tended to be very similar for both membranes operating under the same conditions. All membranes gave permeate product water of R versus feed solids concentration C for all the data generated for t >0 demonstrated reasonable agreement with the expression R ∝ c a where a=0.37 in the current study. This trend has been recorded in previous reported studies, a varying between 0.33 and 0.62 depending on sludge dewaterability.
1 citations