Post-treatment of Composting Leachate by Photocatalytic Process

In this study the capability of UV-ZnO photocatalytic process as a post Treatment method for composting leachate was examined at laboratory scale and in batch mode. The effect of some factors such as initial pH, oxidant concentration, light intensity and reaction time on the removal of organic load and color of leachate were investigated. Biological pre-treated leachate samples were collected from the effluent of leachate treatment facility of a composting plant in north of Iran. A Plexiglas column with 110 mm inner diameter and 300 mm height were used to conduct experiments. UVC lamps with different power levels in the range of 8-40W at the centre of the column were used as the source of irradiation. Based on the results of experiments, after 180 minutes of Radiation with 32W UVC lamps in pH 11 and in the presence of 1g.L-1 of slurry ZnO, maximum COD and color removal were achieved to be 57% and 67%, respectively.

Industrial and economic development over recent decades in most countries along with changes in lifestyle has resulted in considerable growth of industrial and householdwaste. In 1994, the amount of solid waste production was 1.3 billion tons/year, where it has amounted to 1.7 billion tons/year in 2004, indicating a 31% increase. The amount of waste production in Asia in 1998 was also 0.76 Million ton per day. Since biodegradable organic materials constitute approximately 60% of the total urban solid waste in developing countries, leachate treatment is considered as a big concern for waste management in these areas. leachate treatment methods are classified into three groups include: leachate transmission; biodegradation techniques and physiochemical treatment methods. Due to its reliability, simplicity and high cost-effectiveness, biological processes are among conventional methods used for immature leachate treatment. However, due to high organic load of leachate and also presence of refractory pollutants, biological process alone cannot remove all of the organic matters from leachate. In order to enhance the quality of leachate to the discharge standards, post treatment of biologically treated leachate is required. One appropriate solution for complementary treatment of leachate and removal of refractorymaterials is application of photocatalytic processes. This process is mainly dependent on the in-situ generation of hydroxyl radicals under ambient conditions which are capable of converting a wide spectrum of organic compounds into relatively innocuous final products such as CO2 and H2O. Use of photocatalytic methods has attracted great deal of attention thanks to its unique features including full decomposition of contaminantto water and carbon dioxide, simple implementation, reusable materials, and quick removal of pollutants.

Copyright: © Wasteconsult International
Quelle: Waste-to-Resources 2015 (Mai 2015)
Seiten: 12
Preis inkl. MwSt.: € 6,00
Autor: Dr Nader Mokhtarani
Alireza Ranjbari

Artikel weiterleiten In den Warenkorb legen Artikel kommentieren

Diese Fachartikel könnten Sie auch interessieren:

Digestate and compost quality - case studies at anaerobic disgestion plants with the BTA Process
© European Compost Network ECN e.V. (6/2012)
The key for the successful anaerobic digestion of biowaste and/or municipal solid waste is an efficient removal of the impurities before the digestion step. This is not only indispensable for the reliability of the process and therefore the plant availability, but furthermore for the quality of the produced digestate or final compost. With the existing developments within the EU, the quality of the digestate / compost has become a focus of attention. Further Authors: P. Bolzano - Biotec Sistemi s.r.l. J. Del’haye - IVVO

Organic waste composts as potential fertilisers for cereal prodktion in developing merket
© European Compost Network ECN e.V. (6/2012)
Production of waste compost is well established in many European countries. In developing markets, however, the waste composts are not fully accepted as conventional organic fertilisers. The nutrient value of composts must be studied locally. The aim of the study was to investigate the potential fertilisation value of two composts for cereal production.

Multi-component heat and mass transport model for composting process: Experimental validation
© European Compost Network ECN e.V. (6/2012)
Composting consists in an aerobic process where the organic matter from wastes is biodegraded and converted into a stable granular material called compost. Even if composting is considered to be based on natural phenomenon, it is governed by very complex mechanisms, involving many parameters such as quality and accessibility of the nutriments for micro-organisms, local oxygen content, temperature of the medium, pH, moisture content, and so on (Mustin, 1987, Diaz et al., 2007;). These parameters directly affect biodegradation kinetics. Moreover, they are interdependent and impacted by the operating conditions, which make difficult the understanding of the process.

Compost pile Monitoring with GC-MS, E-Nose and olfactometry: comparison of different approaches
© European Compost Network ECN e.V. (6/2012)
In many cases, odours emitted by municipal solid waste (MSW) plants are bothersome for the surrounding population.However, regulation and controls are difficult to determine. The complexity of emissions and the subjectivity of odourperception can partially explain this difficulty. Another concern is that the various techniques to measure such odoursare not standardised. This paper compares complementary approaches to monitor odours. The odour source selected forthis study is green waste compost at different maturity stages.

Greenhouse gas emissions from home composting in practice
© European Compost Network ECN e.V. (6/2012)
Home composting is a wide-spread treatment option for biological household waste in Sweden. According to theSwedish Waste Management association (Avfall Sverige, 2011), 60 000 tonnes of compostable waste were homecomposted in 2010. This represents a rather large portion (10 %) of all the household waste treated biologically.Nevertheless, research on process efficiency and environmental effects of home composting is scarce. The objective ofthis study was to investigate the influence of different process parameters on greenhouse gas (GHG) emissions(methane, CH4, nitrous oxide, N2O and carbon dioxide, CO2) from home composting under real householdmanagement. Further Authors: Alexander Johansson - Swedish University of Agricultural Sciences Björn Kempe - Swedish University of Agricultural Sciences



 Angemeldet bleiben

Passwort vergessen?

der Spezialist für biologische
und mechanisch-biologische
Verwertung organischer Stoffe