摘要:

ABSTRACTA major capital programme is being undertaken by Yorkshire Water to rebuild its water‐treatment plants.Despite good process design, more stringent standards mean that process control, in particular chemical dosing, has become increasingly important.This paper describes the investigation of chemical dosing control using streaming current detection, which was initially applied at Langsett water‐treatment works as a means of controlling the ferric sulphate dose in the clarification process.Following this successful application, further evaluation was carried out using streaming current detection to control the polyelectrolyte dose in the sludge thickening proc

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00732.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe first use of the Sirofloc process in an operational water‐treatment works, outside Australia, was commissioned in 1988 by Yorkshire Water at Redmires, Sheffield. The plant represents a major advancement in the development of a new type of treatment process for drinking water.This paper describes the new treatment process and the method and reasons adopted in developing a full‐scale plant. The first four months of operation are reviewed, with particular attention to the water quality produced and the performance of the plant. Further areas for development in improving the performance of the process are identif

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00733.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe River Sheaf Comprehensive Flood‐Alleviation Scheme is a flood‐defence scheme promoted by the Yorkshire Region of the National Rivers Authority. The scheme will improve 5.2 km of main river from a 1‐in‐5 year standard to a 1‐in‐50 standard at an overall cost of £3.1 million over the next four years. The hydrological, hydraulic and benefit/cost analyses have been carried out by the National Rivers Authority. Balfour Maunsell were commissioned to carry out the detailed structural design, prepare and administer contracts and supervise construction. The paper covers the preliminary design work and the detailed design of Phase I o

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00734.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe serious pollution of groundwater under cities is demonstrated with data from Coventry (UK), Madras (India) and Birmingham (UK). Microbiological organisms, nitrates, and organic chemicals are common, but many other pollutants are also found. The main sources are industry and inadequate sewerage. The provision of sewerage must remain a priority, on health grounds, for cities in the developing world. Virtually all industrial sites pollute the soil and groundwater through careless handling of chemicals. Industrial sites should be treated like landfills: contained and carefully monitored. If industrialists had to use groundwater from below their own sites, they would suffer the consequences of any pollution. This would also clean up the aquifer by pumping out polluted water.

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00735.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe paper describes a programme of infilling, the first phase of which will bring an immediate improvement to the amenity of Greengairs village and will screen the subsequent filling operations from view. The landfill is technically advanced, being designed as an engineered leachate attenuation site but including full back‐up control facilities. These take the form of a full underdrainage blanket under the first two phases, which will collect attenuated leachate and allow confident predictions of the site's behaviour for the design of subsequent phases.A landfill gas‐collection and control system was incorporated in accordance with laid‐down guidelines.Other factors which have significant environmental effects are the control of site surface waters and their interaction with groundwater, mine drainage, and the receiving w

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00736.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThis paper describes the elements and some early results of a major national research programme which was initiated to address the continuing serious problem of the pollution of rivers by farm wastes. This has involved a national assessment of the extent of the problem, aimed at identifying ‘high‐risk’areas in the UK. Biological assessment techniques have been developed on the basis of extensive surveys at sites in West Wales, which show potential for the rapid detection of water‐quality problems caused by farm effluents. Detailed studies at selected sites have illustrated the variability in the ways that farming activities can affect the biology and chemistry of rivers. The development of tools, which provide the basis for decisions on acceptable levels of farming activity in accordance with environmental quality objectives, is di

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00737.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe Welbeck reclamation and landfill project (near Wakefield) is reclaiming over 1.5 km2of former aggregate and colliery workings through the creation of a new landform. This is to incorporate millions of tonnes of colliery spoil and controlled (i.e. household, trade) wastes, and to avoid the need for disposal on less suitable sites elsewhere.The scheme is already under way, but the proposed diversion of the River Calder to one side of the site would more than double its capacity for landfill. In environmental terms, the project has been seen as the creation of a new river corridor, rather than simply the diversion of a river channel.The paper outlines the engineering of the river diversion, which is routed for about 2 km through varied and difficult ground conditions, and gives a number of examples of the priority attached to landscape and after‐use factors, and their intrinsic importance in desig

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00738.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThe use of automated equipment for monitoring water quality is a concept which has received considerable impetus since the Water Act 1989 was introduced. This paper reports on two initiatives by the National Rivers Authority to develop systems for use in their role as the guardians of the water environment. Portable systems have been developed for detection of episodic pollution events and instantaneous spot measurement of water quality.This paper outlines the principal activities of the development of the systems and their use.

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00739.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTWaste stabilization ponds are widely used in many European countries, such as France and Germany, for the treatment of wastewater from mainly small communities. There would seem to be no reason why they should not also be a suitable treatment process for populations of under 2000 in the UK. The relative advantages and disadvantages of ponds are compared to other small community treatment systems, such as rotary biological contactors, biological filters and reed‐bed systems, particularly in relation to effluent standards with respect to algae, nutrient removal and relative cost

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00740.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY

摘要:

ABSTRACTThis paper reviews research and development on the causes, consequences and methods of controlling septicity in sewers. It draws on information given in 55 published papers on the subject. Explanations are given on the deviation of equations used to predict critical conditions in sewers and rising mains. The consequences of septicity, including toxicity, corrosion and odour nuisance, are described and discussed. Prevention is always recommended over cure, but where this cannot be achieved the methods of controlling septicity generally rely on maintaining an adequate supply of oxygen (dissolved or chemically available) to oxidize previously‐formed sulphide. Other options to cure the effects of septicity include minimizing the emission of hydrogen sulphide into the atmosphere, deodorizing vented air, and the use of protective coatings or corrosion‐resistant pi

ISSN:1747-6585    

DOI:10.1111/j.1747-6593.1992.tb00741.x

出版商:Blackwell Publishing Ltd    

年代:1992

数据来源: WILEY