Adsorption of arsenate from water using neutralized red mud.

The potential for using seawater-neutralized red mud (Bauxsol), a waste from aluminum manufacturing, as an adsorbent for removing As(V) (arsenate) from water is studied. Herein, adsorption characteristics are investigated and it is shown that adsorption follows the Langmuir model, with the adsorption constants indicating the feasibility of the process. Furthermore, the adsorption is found to increase with decreasing pH (i.

Adsorption of arsenic from water using activated neutralized red mud.

In this paper activated seawater-neutralized red mud, herein referred to as activated Bauxsol (AB), is used as a novel adsorbent for removing inorganic arsenic (As) from water. The adsorption of As onto AB is studied as a function of contact time, particle size, pH, initial As concentration, AB dosage, and temperature. Kinetic data indicate that the process pseudoequilibrates in 3 and 6 h for As(V) (arsenate) and As(III) (arsenite), respectively, and follows a pseudo-first-order rate expression.

Increasing the arsenate adsorption capacity of neutralized red mud (Bauxsol).

The possibility of increasing the arsenate adsorption capacity of seawater-neutralized red mud (Bauxsol) through acid treatment, combined acid and heat treatment, and the addition of ferric sulfate (Fe(2)(SO(4))(3).7H(2)O) or aluminum sulfate (Al(2)(SO(4))(3). 18H(2)O) is investigated.

Social and institutional feasibility of recycling nutrients in waste in Southern Thailand.

The social and institutional feasibility of recycling plant nutrients in waste in three case study areas, Phattalung, Kuan Lang and Prik, in Southern Thailand has been studied. Three sanitation systems (existing with modifications and alternative) in each area have been evaluated with respect to their acceptance among the local stakeholders and accommodation within the Thai legal framework. Culturally, most proposed recycling methods were accepted by local users, and great interest was expressed towards many of the proposed sanitation systems, except recycling methods involving direct contact with human excreta in Prik (Islamic culture).

Technical, economic and environmental feasibility of recycling nutrients in waste in Southern Thailand.

Technical, economic and environmental criteria were used to evaluate the feasibility of recycling plant nutrients in kitchen waste, human excreta and sullage from households in Phattalung (urban), Kuan Lang (peri urban) and Prik (rural) in Southern Thailand. The difference in situation and context of the three areas called for individual solutions, and for each area three sanitation systems were evaluated. However, in all three areas recycling human excreta and kitchen waste via composting latrines was found to be more environmental feasible than human excreta managed in septic tanks or sub surface trickle irrigation and kitchen waste disposed of at landfill sites or treated at composting plants.

Availability and quality of solid waste and wastewater in Southern Thailand and its potential use as fertiliser.

Recycling nutrients to agriculture with waste in Southern Thailand has been assessed in three model-areas: Kuan Lang, Prik and Phattalung. Samples of biodegradable solid waste and gray wastewater were collected and characteris ed physically and chemically. At present nutrients in the biodegradable solid waste and wastewater are lost, but especially kitchen waste and grey household wastewater constitute a large fertiliser potential.