Overview of biologically digested leachate treatment using adsorption

Biological process is effective in treating most biodegradable organic matter present in leachate; however, a significant amount of ammonia, metals and refractory organic compounds may still remain in this biologically digested leachate. This effluent cannot be released to receiving bodies until the discharge limit is met. Several physical/chemical processes have been practiced as post-treatment to remove the remaining pollutants including coagulation–flocculation, oxidation and adsorption. Adsorption is often applied in leachate treatment as it enhances removal of refractory organic compounds. This chapter will focus on works related to adsorption as one of the commonly used methods to treat biologically digested leachate further down to acceptable discharge limit

Overview of biologically digested leachate treatment using adsorption

Biological process is effective in treating most biodegradable organic matter present in leachate; however, a significant amount of ammonia, metals and refractory organic compounds may still remain in this biologically digested leachate. This effluent cannot be released to receiving bodies until the discharge limit is met. Several physical/chemical processes have been practiced as post-treatment to remove the remaining pollutants including coagulation–flocculation, oxidation and adsorption. Adsorption is often applied in leachate treatment as it enhances removal of refractory organic compounds. This chapter will focus on works related to adsorption as one of the commonly used methods to treat biologically digested leachate further down to acceptable discharge limit

Alternative low-cost adsorbent for water and wastewater decontamination derived from eggshellwaste: an overview

As the current global trend towards more stringent environmental standards, technical applicability and cost-effectiveness became key factors in the selection of adsorbents for water and wastewater treatment. Recently, various low-cost adsorbents derived from agricultural waste, industrial by-products or natural materials, have been intensively investigated. In this respect, the eggshells from egg-breaking operations constitute significant waste disposal problems for the food industry, so the development of value-added by-products from this waste is to be welcomed. The egg processing industry is very competitive, with low profit margins due to global competition and cheap imports. Additionally, the costs associated with the egg shell disposal (mainly on landfill sites) are significant, and expected to continue increasing as landfill taxes increase. The aim of the present review is to provide an overview on the development of low-cost adsorbents derived from eggshell by-products

Measurement of biochemical oxygen demand of the leachates

Biochemical oxygen demand (BOD) of the leachates originally from the different types of landfill sites was studied based on the data measured using the two manometric methods. The measurements of BOD using the dilution method were carried out to assess the typical physicochemical and biological characteristics of the leachates together with some other parameters. The linear regression analysis was used to predict rate constants for biochemical reactions and ultimate BOD values of the different leachates. The rate of a biochemical reaction implicated in microbial biodegradation of pollutants depends on the leachate characteristics, mass of contaminant in the leachate, and nature of the leachate. Character of leachate samples for BOD analysis of using the different methods may differ significantly during the experimental period, resulting in different BOD values. This work intends to verify effect of the different dilutions for the manometric method tests on the BOD concentrations of the leachate samples to contribute to the assessment of reaction rate and microbial consumption of oxygen

Integrated treatment of submerged membrane and adsorption using dried Aphanothece sp for removing cadmium from synthetic wastewater

Water pollution from the discharge of wastewater containing toxic heavy metals such as cadmium (Cd) to the natural water bodies is one of the biggest problem affecting humanity. Different technologies such as sorption, membrane filtration etc. have been used to remove heavy metal from the polluted water. In this work, the effects of operational parameters on the ability of the submerged membrane adsorption hybrid system (SMAHS) to remove Cd2+ from synthetic wastewater using dried Aphanothece sp A15 as a suspended biosorbent was evaluated. This biomass originates from a cyanobacterium was cultivated in a photobioreactor system enriched with 15 % of CO2. The operational parameters investigated were filtration flux, biomass dosage, frequency of replacing biosorbent, and initial metal concentration. Of the various parameters, the filtration flux and the initial concentration of Cd were the most influential parameters concerning biosorption efficiency in this study. More than 95 % removal of Cd was achieved with initial Cd concentration of 4.89 mg/L at a filtration flux of 20 L/m2.h. The highest biosorption capacity (112.89 mg/g) was obtained with a flux of 60 L/m2.h.The biosorbent became saturated after 20 h of operation without biosorbent replacement. This suggests that the dried biomass of Aphanothece sp A15 has the potential to be implemented in the industrial wastewater treatment plant using SMAHS processes integrated within the CO2 bio-sequestration unit. Therefore, cadmium removal from wastewater can be coupled with the reduction of CO2 emissions from flue gas

Heavy metal removal from aqueous solutions using biomaterials and/or functional composites : recent advances and the way forward in wastewater treatment using digitalization

202403 bcvcVersion of RecordOthersUniversiti Teknologi MalaysiaPublishedC