Related Papers
Energy positive wastewater treatment and sludge management
Veera Gnaneswar Gude
Increasing population and high living standards around the world demand for resources to maintain clean and safe environment. Wastewater needs to be processed to remove biological, chemical and physical contaminants before it can be discharged into receiving water bodies such as rivers, creeks, lakes and oceans. Current wastewater treatment processes, especially, aerated systems are energy intensive. However, wastewater is considered a rich energy source. This energy, if properly extracted, can exceed the treatment energy requirements by up to 10-fold [1]. Wastewater treatment inevitably produces large quantities of biomass (sludge) which is one of the main forms of energy feedstock [2]. A general treatment scheme includes primary (physical and chemical processes such as inorganic solids separation by sedimentation, aeration and pH adjustment) treatment followed by secondary treatment (chemical and biological treatment involving organic substrate degradation by microorganisms coupled with biochemical reactions) with successive filtration, disinfection and aeration steps. This treatment scheme is often referred to as secondary or biological treatment which is the standard for all wastewater treatment plants around the world. While wastewater treatment can be energy intensive, several options are available for making this process energy-yielding rather than an energy-consuming one. Wastewater contains approximately 60% (dry basis) of organic compounds which are mostly biodegradable,
Clean and Cost Effective Industrial Wastewater Treatment Technology for Developing Countries
2015 •
Tun Tun Naing
Industrial processes create a variety of wastewater pollutants which are difficult and costly to treat. Wastewater characteristics and levels of pollutants vary significantly from industry to industry. The growth of industrialization leads to the rise of wastewater from various industries and so the pollution load on the environment is increasing. The high cost for the treatment and disposal of industrial wastewater is now become a challenging problem for developing countries. The sample used in this research was combine wastewater from distilleries, sugar factories, candy factories and textile dyeing factories. Among them, distilleries and textile dyeing factories are the most wastewater producing industries and the wastewater from these are not easily biodegradable. Total chemical oxygen demand COD of wastewater sample was too high about 30000 mg/l and biochemical oxygen demand (BOD5) also high over 7000 mg/l. Conventional wastewater treatment is not sufficient to treat this amoun...
Water Science and Technology
Cost-effective pre-treatment of food-processing industrial wastewater
1999 •
Fatma A El-Gohary
Journal of Environmental Management
Sewage sludge processing and management in small and medium-sized municipal wastewater treatment plant-new technical solution
2019 •
Małgorzata Kacprzak
International Journal for Research in Applied Science & Engineering Technology (IJRASET)
Review: Wastewater Treatment in Different Industries
2022 •
IJRASET Publication
Wastewater treatment is a process used to remove contaminants from wastewater and convert it into an effluent that can be returned to the water cycle. Once returned to the water cycle, the effluent creates an acceptable impact on the environment or is reused for various purposes (called water reclamation). The treatment process takes place in a wastewater treatment plant. There are several kinds of wastewater which are treated at the appropriate type of wastewater treatment plant. For domestic wastewater (also called municipal wastewater or sewage), the treatment plant is called a sewage treatment plant. For industrial wastewater, treatment either takes place in a separate industrial wastewater treatment plant, or in a sewage treatment plant (usually after some form of pre-treatment). Further types of wastewater treatment plants include agricultural wastewater treatment plants and leachate treatment plants. Processes commonly used in wastewater treatment include phase separation (such as sedimentation), biological and chemical processes (such as oxidation) or polishing. The main by-product from wastewater treatment plants is a type of sludge which is usually treated in the same or another wastewater treatment plant. Biogas can be another by-product if anaerobic treatment processes are used. Treated wastewater can be reused as reclaimed water. The main purpose of wastewater treatment is for the treated wastewater to be able to be disposed or reused safely. However, before it is treated, the options for disposal or reuse must be considered so the correct treatment process is used on the wastewater. Performance of state owned sewage treatment plants, for treating municipal waste water, and common effluent treatment plants, for treating effluent from small scale industries, is also not complying with prescribed standards. Thus, effluent from the treatment plants, often, not suitable for household purpose and reuse of the waste water is mostly restricted to agricultural and industrial purposes. The development of innovative technologies for treatment of wastewaters from various industries is a matter of alarming concern for us. Although many research papers have been reported on wastewater pollution control studies, but a very few research work is carried out for treatment of wastewater of steel industries, especially in reference to development of design of industrial effluent Treatment Plants (ETP) system. Another beneficial aspect of this research work will be recycling, reuse of water and sludge from steel industry The whole technologies for treating industrial wastewater can be divided into four categories:-Chemical, Physical, Biological and mathematical approaches.
International Journal of Environmental Science and Technology
Advanced technologies for the treatment of wastewaters from agro-processing industries and cogeneration of by-products: a case of slaughterhouse, dairy and beverage industries
2017 •
Zenebe Yirgu
International Journal of Environmental Research
Near Future Energy Self-sufficient Wastewater Treatment Schemes
2020 •
Veera Gnaneswar Gude
Achieving energy self-sufficiency is critical for wastewater treatment plants (WWTPs) to comply with rapidly changing environmental regulatory standards in a sustainable manner. Currently, a small percentage of WWTPs around the world produce energy for beneficial use and only a handful of these plants are energy self-sufficient. We propose three energypositive wastewater treatment schemes and use quantitative analysis to assess their potentials for carbon and nitrogen removal and energy generation from municipal wastewater. This research identifies potential challenges in the selection and implementation of energy recovery process configurations and proposes practically feasible energy-positive wastewater treatment process configurations. Energy self-sufficiency can be achieved through biogas production while simultaneously minimizing the energy consumption for treatment. Furthermore, energy recovery can be enhanced in the near future (i) by increasing the COD capture in primary treatment to enhance energy production; (ii) by replacing activated sludge process with other less energy-intensive biological treatment technologies; and (iii) by increasing energy production from digesting supplementary feedstock in anaerobic codigestion (AD) schemes. This paper presents a quantitative analysis of three process schemes that progressively build upon the concept of transforming the conventional activated sludge wastewater treatment plants (CAS-WWTP) into energy self-sufficient wastewater treatment facilities. These schemes also include a hypothetical but practically feasible WWTP configuration, which represents an alternative energy self-sufficient wastewater process scheme for future designs.
Water
Wastewater Treatment: Current and Future Techniques
2022 •
Amin Mojiri, M. Bashir
Water Science & Technology
Sustainability assessment of advanced wastewater treatment technologies
2008 •
Henrik Wenzel
Water Science and Technology
Upgrading of sewage treatment plant by sustainable and cost-effective separate treatment of industrial wastewater
2010 •
Willie Driessen, Mark C M van Loosdrecht, R Haarhuis
