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The methods of purification of water for use in soft drink manufacture are described.

This paper aims to evaluate of the microalgae potential for commercial application, in particular to conduct experimental study of biogenic compounds removal from sewage waters by microalgae, and to calculate economical benefits from biofertizers and biofuel production.

Experimental study in the concentration change of nitrogen and phosphorus compounds in the cultivation of Chlorella Vulgaris microalgae in various types of sewage water was carried out.

The efficiency wastewater treatment by microalgae was confirmed. The economic benefit from the biomass utilization as biofuel production was calculated.

Implementation of wastewater treatment technology with biomass recycling for biofuel and biofertilizers production will minimize the impact on the environment.

As a results of experimental studies, the ability of microalgae to reduce biogenic elements in wastewater was confirmed. Microalgae can be used both for wastewater treatment to biogenic elements removal, such as phosphorous and nitrogen compounds, and biofuel, biofertilizers production. Prospects of the commercial use of microalgae are obvious. They are specially adapted to an environment dominated by viscous forces.

The Food and Drugs Bill introduced by the Government affords an excellent illustration of the fact that repressive legislative enactments in regard to adulteration must always be of such a nature that, while they give a certain degree and a certain kind of protection to the public, they can never be expected to supply a sufficiently real and effective insurance against adulteration and against the palming off of inferior goods, nor an adequate and satisfactory protection to the producer and vendor of superior articles. In this country, at any rate, legislation on the adulteration question has always been, and probably will always be of a somewhat weak and patchy character, with the defects inevitably resulting from more or less futile attempts to conciliate a variety of conflicting interests. The Bill as it stands, for instance, fails to deal in any way satisfactorily with the subject of preservatives, and, if passed in its present form, will give the force of law to the standards of Somerset House—standards which must of necessity be low and the general acceptance of which must tend to reduce the quality of foods and drugs to the same dead‐level of extreme inferiority. The ludicrous laissez faire report of the Beer Materials Committee—whose authors see no reason to interfere with the unrestricted sale of the products of the “ free mash tun,” or, more properly speaking, of the free adulteration tun—affords a further instance of what is to be expected at present and for many years to come as the result of governmental travail and official meditations. Public feeling is developing in reference to these matters. There is a growing demand for some system of effective insurance, official or non‐official, based on common‐sense and common honesty ; and it is on account of the plain necessity that the quibbles and futilities attaching to repressive legislation shall by some means be brushed aside that we have come to believe in the power and the value of the system of Control, and that we advocate its general acceptance. The attitude and the policy of the INTERNATIONAL COMMISSION ON ADULTERATION, of the BRITISH FOOD JOURNAL, and of the BRITISH ANALYTICAL CONTROL, are in all respects identical with regard to adulteration questions; and in answer to the observations and suggestions which have been put forward since the introduction of the Control System in England, it may be well once more to state that nothing will meet with the approbation or support of the Control which is not pure, genuine, and good in the strictest sense of these terms. Those applicants and critics whom it may concern may with advantage take notice of the fact that under no circumstances will approval be given to such articles as substitute beers, separated milks, coppered vegetables, dyed sugars, foods treated with chemical preservatives, or, in fact, to any food or drug which cannot be regarded as in every respect free from any adulterant, and free from any suspicion of sophistication or inferiority. The supply of such articles as those referred to, which is left more or less unfettered by the cumbrous machinery of the law, as well as the sale of those adulterated goods with which the law can more easily deal, can only be adequately held in check by the application of a strong system of Control to justify approbation, providing, as this does, the only effective form of insurance which up to the present has been devised.

This paper aims to introduce two methods for immobilisation of TiO₂ nanoparticles on a glass plate by means of silicon resin as a medium. Then, to ensure the effectiveness of these stabilisation methods, the photocatalytic degradation and mineralisation of the dye C.I. Reactive Blue 21 (RB21), as a model organic pollutant, were compared using these immobilised systems and the suspended one utilizing UV and sunlight irradiations individually.

TiO₂ nanoparticles were supported onto a glass support by silicon resin as an adhesion agent by spraying of TiO₂ nanoparticles on the resin surface, which covered the glass plate or brushing the mixture of TiO₂ and the resin onto the glass. The characteristics of the applied nano-TiO₂ were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Brunauer

Emmett–Teller. Photocatalytic degradation and mineralisation of C.I. Reactive Blue 21 (RB21) by two immobilised systems were compared with suspended system in a batch mode under UV and sunlight irradiations after 2 h of treatment.

The results showed that these immobilised modes had efficiencies, including 82-87 per cent degradation of RB21 and 52-58 per cent decrease in chemical oxygen demand (COD) for the operational time of 120 min, comparable to that of the suspended mode (91 per cent degradation of RB21 and, consequently, COD is decreased by 65 per cent). Comparison between photocatalytic efficiencies of two immobilised systems revealed that coating by spraying method performed better than brushing one due to more available surface area of TiO₂. Finally, the results obtained from the mentioned supported systems under sunlight indicated the efficiencies about 87 to 89 per cent in comparison of the suspension system regardless of the reaction time enhancement up to 15 h compared to the UV irradiation.

In this research, the fixation of TiO₂ nanoparticles on a substrate such as normal glass by an easy, inexpensive, durable, repairable and repeatable technique for wastewater treatment was introduced. Due to the simplicity and cheapness of these stabilisation methods and as these stabilisation methods are applicable on other substrates such as concrete, ceramics, etc., you can use these methods in major scales for purification of contaminated water, for example for stabilisation of TiO₂ nanoparticles on wall pool utilized for water purification can be used.

Two introduced immobilisation methods in this study are novel. The photocatalytic efficiency of these immobilised systems in degradation of water contaminants was investigated by using these systems in degradation and mineralisation of the dye C.I. Reactive Blue 21 (RB21), as a model organic pollutant compared with same TiO₂ nanoparticles in an aqueous suspension system under UV light. Furthermore, this paper investigated replacing of inexpensive sources of UV light instead of UV lamps, and then the same photocatalytic reactions were carried out under sunlight as a UV source and degradation efficiencies by two UV sources were compared.

The study addresses the crucial issue of sustainable development goals (SDGs) and institutional voids in the peri-urban geographies of India. The peri-urban geographies, though within a cosmopolitical city, lack basic amenities like drinking water, sanitation and waste management. We study social entrepreneurial strategies to address these issues and thereby illustrate strategies that could be used to address sustainable development goals.

The article uses a multiple case study method to understand how social enterprises can provide scalable solutions addressing SDG related issues in India.

The research found three strategies that can help provide scalable solutions: First, the extensive use of the latest digital technologies to decrease cost and increase reach; second, extensive partnerships across the board; and finally, a focus on social innovations and business models that are accessible, affordable, available and known to the end-users.

The research contributes to institutional voids literature, SDGs literature and scaling of social enterprise literature. The research confirms that institutional voids are entrepreneurial opportunities. The research empirically shows how social enterprises are addressing SDGs at BoP. Finally, the core findings of the article contribute to the scaling of social enterprise literature.

This paper uses the input‐output methodology in order to study the water pollution associated with an economic system, through an examination of the productive relationships which link the different sectors and their involvement in the water pollution that is generated. The indicators associated with the demand models are obtained on the basis of the construction of primary pollution and return matrices. In a second stage, an analysis is made of the trade‐offs between economic and environmental variables, as a way of linking the variables to be taken into account for the purposes of environmental planning. The empirical application is made for the regions of the Ebro Valley (Spain). The results show the importance of considering the responsibility of the agriculture, livestock and food sectors for the coherent treatment of the water pollution problem.

A sustainable selection method for facility location of the water treatment is formulated by best–worst method. In addition, the model addresses the selection of appropriate technologies in the treatment plant, management of water leakage in the whole transmission network by using modernization and selection of different transmission technologies. Finally, the interaction between water and energy in this network seems to be paying particular attention.

Rapid population growth and urban development, and the constraints of water supply have become one of the crucial challenges around the world in the 21st century. Hence, the use of refined urban wastewater is increasing in many countries as an alternative source of water. In this regard, the rehabilitation of urban wastewater recycling and reuse has been proposed as one of the most suitable solutions for urban water management. Hence, in this paper, a mathematical model is formulated to design the simultaneous marketing of the urban water distribution network and wastewater treatment (including).

It seeks to ensure that energy is supplied through chemical methods to ensure that the system's energy dependence is on the national electricity grid. And in order to validate the model, a case study has been studied. By analyzing the results, it can be concluded that the upgrading of sewage treatment plants to replace underground water and water from nearby dams in household, agricultural and industrial applications will have positive environmental and economic impacts. One of the notable environmental impacts is the decline in groundwater and water scarcity in the coming years.

The summary of contributions is presented follow as: design and planning of water and urban wastewater integrated network; sustainable selection of facility location for the water treatment; capability selecting different treatment technologies in simultaneous design water and urban sewage supply chain; managing water leak in the network; proposed a water–energy nexus model in simultaneous design water and urban sewage supply chain; studying the feasibility of construction of power plants from biogas, the resulting of anaerobic digestion in treatment centers.

At a meeting of the Council of the Royal Borough of Kensington on June 5th Councillor A. J. RICE‐OXLEY, M.D., Chairman of the Public Health Committee, brought up a report as follows:—

Cleanrooms are highly controlled enclosed rooms where air quality is monitored and ensured to have less contamination according to standard cleanliness level. Air filters are used to optimize indoor air quality and remove air pollutants. Filter media and filtering system are decided as per requirement. Depth filter media are mostly used in cleanroom filtrations. This paper aims to present a comprehensive review of the evolution of cleanroom filter media. It evaluates the advantages and disadvantages of air filter media. It is also studied which air filters have additional properties such as anti-microbial properties, anti-odour properties and chemical absorbent. Development and innovation of air filters and filtration techniques are necessary to improve the performance via the synergistic effect and it can be a possible avenue of future research.

This paper aims to drive the future of air filter research and development in achieving high-performance filtration with high filtration efficiency, low operational cost and high durability. Air pollutants are classified into three types: suspended particles, volatile organic pollutants and microorganisms. Technologies involved in purification are filtration, water washing purification, electrostatic precipitation and anion technology. They purify the air by running it through a filter medium that traps dust, hair, pet fur and debris. As air passes through the filter media, they function as a sieve, capturing particles. The fibres in the filter medium provide a winding path for airflow. There are different types of air filters such as the high-efficiency particulate air filter, fibreglass air filter and ultra-low particulate air filter.

Emerging filtration technologies and filters such as nanofibres, filters with polytetrafluoroethylene membrane are likely to become prevalent over the coming years globally. The introduction of indoor air filtration with thermal comfort can be a possible avenue of future research along with expanding indoor environment monitoring and improving air quality predictions. New air filters and filtration technologies having better performance with low cost and high durability must be developed which can restrict multiple types of pollutants at the same time.

The systematic literature review approach used in this paper highlights the emerging trends and issues in cleanroom filtration in a structured and thematic manner, enabling future work to progress as it will continue to develop and evolve.

Development of high efficiency nanofibrous air filter membrane by electrospinning process, to address the air pollution (both the particulate matter and the gaseous components) problem, which has become a major environmental concern.

By exploiting the advantage of active sites on soy protein isolate (SPI), the very high surface area of micro-pore rich activated carbon (AC) and the biocompatibility and biodegradable nature of polyvinyl alcohol (PVA). The authors have developed a SPI/AC/PVA hybrid membrane. Spun-bond nonwoven substrate was used as the support material to enhance the mechanical properties and also the filter handling properties. The properties of nanofibrous membrane including morphology, air permeability, filtration efficiency and formaldehyde absorption test were carried out as per standard test methods.

SPI-based membrane offers a great potential in air filtration/purification applications. Its potential to capture glancing pollutants at the molecular level is because of the presence of numerous functional groups on the soy protein surface, which enhances the adsorption of particulate matter and toxic gases, even bacteria and viruses to its surface.

The results are anticipated to provide a potential method to promote the development of a nanofibrous membrane, which can act as a high performance, dual function and eco-friendly air filter/purifier.