Entrapment of powdered drinking water treatment residues in calcium-alginate beads for fluoride removal from actual industrial wastewater

Ramírez-Pereda

Water Environment Research

et al. 2020

The biodegradation of domestic wastewater contaminants has been carried out using microorganisms immobilized in sodium alginate gel (Alg‐Na). A fixed bed reactor with immobilized microorganisms was used for the treatment of domestic wastewater. A wastewater pretreatment was carried out to remove the larger particulate matter, which consisted of a reactor packed with different materials (anthracite, zeolite, and activated carbon). Later, a second reactor packed with balls with immobilized microorganisms was used to eliminate organic matter and nutrients. 2.5% w/v of Alg‐Na was used as a support to immobilize the microorganisms. According to the results, a total phosphorus (TP) and chemical oxygen demand (COD) removal of 94.26% and 78.25% was obtained, respectively. In addition, the degradation rate for both organic matter and phosphorous was studied by using the kinetic model for fix bed reactor. © 2020 Water Environment Federation Practitioner points Phosphorous and organic matter removal by adsorption and immobilized microorganisms. High removal efficiency of phosphorous and organic matter was found. An innovative wastewater treatment alternative is proposed. Kinetic model for fixed bed reactor is also proposed for scaling‐up purposes.

Section: Methodsmentioning

confidence: 99%

Kinetics of a fixed bed reactor with immobilized microorganisms for the removal of organic matter and phosphorous

Ramírez-Pereda

Water Environment Research

et al. 2020

Environ. Sci.: Water Res. Technol.

“…In consideration of the importance of particle size, DWTR samples in most studies, are generally air-or oven-dried, crushed, and sieved to retain the smaller sizes of higher specific surface areas for experimental tests and better adsorption capacities. The calcination process at high temperatures is also used to increase the porosity of the material [32][33][34][35][36][37][38][39] and other modifications of the structure can be done through the formation of nanoparticles, 35,36 the addition of alginate, chitosan or molasses for pelletization [40][41][42][43] or other material additions such as bentonite 44 (see panels C in Fig. 2 and 3 and Tables S2 and S3, † 2nd column).…”

Section: Particle Size Specific Surface Area and Porositymentioning

confidence: 99%

Re-utilization of drinking water treatment residuals (DWTR): a review focused on the adsorption of inorganic and organic contaminants in wastewater and soil

Belzile,

Chen

2024

“…Due to its cost effectiveness, gel entrapment using calcium-alginate beads is widely used in immobilization of various powdered materials to remove target pollutants from an aqueous solution [19]. Jung et al [29] firstly reported a gel entrapment of WTRs for the production of fluoride adsorptive media. Thermal pretreatment (calcinated at 450 • C for 4 h) of alum sludge was added to 2% (w/v) sodium alginate solution, and the mixture was stirred for 10 h. Thereafter, it was dropped into 2% (w/v) calcium chloride to form particulate under gentle stirring.…”

Section: Gel Entrapment Of Wtrsmentioning

confidence: 99%

Granulation of Drinking Water Treatment Residues: Recent Advances and Prospects

Ren

Zhao

Wei

et al. 2020

Water

Beneficial reuse of drinking water treatment plant residues (WTRs) has been intensively studied worldwide in the last decades, but few engineering applications can be found. The majority of WTRs were directly reused in cake form (after dewatering), e.g., alum sludge cake as main substrate used in constructed wetlands (CWs), or oven dried and ground powdery form, e.g., sorbent for pollutant removal. However, WTRs reuse in such forms has several drawbacks, i.e., difficulty of recovering and easy clogging (in CWs), which result in limited WTRs engineering applications. Granulation or pelleting could widen and be a wiser WTRs reuse route and also seems to be a promising strategy to overcome the “application bottleneck” issues. In the literature, a number of trials of WTRs granulation have been reported since 2008, including sintering ceramsite, gel entrapment and newly emerged techniques. Hence, there is a need to overlook these studies and promote WTRs granulation for further development. To this end, this review firstly provides a piece of updated comprehensive information and critical analysis regarding WTRs granulation/pelleting technology. It aims to enhance WTRs granulation studies in the developing stage and thus enlarge WTRs engineering applications.