As removal using ion exchange with Spent Brine Recycling

Abstract

A conventional sulfate-selective Type-2 polystyrene strong base anion resin was studied for arsenic (As) removal from Albuquerque, N.M., drinking water. Attention was focused on the regeneration aspects of ion exchange and the potential for reusing the spent brine directly without removing As. The major finding was that As-laden spent brine with makeup salt addition to 1 M chloride could be reused up to 20 times with no effect on As leakage and minimal effect on run length. The authors also found that As could be removed from the spent recycle brine using ferric hydroxide coagulation in such a way that the resulting sludge passed the toxicity characteristic leaching procedure test as a nonhazardous waste.on exchange is an important arsenic-(As-) removal process for source waters containing <500 mg/L total dissolved solids and <120 mg/L sulfate (Ghurye et al, 1999;Clifford et al, 1998;Clifford et al, 1997;Clifford & Lin, 1986). Usually, the source water [oxidized, if necessary, to convert As(III) to As(V)] is passed through a bed of chloride-form strong base anion (SBA) exchange resin with the arsenate ion in the source water being exchanged for the chloride ion on the resin. If ferrous iron is present in the raw water above about 0.3 mg/L, the oxidation-filtration pretreatment process, which will remove some As, must precede the ion exchange step to avoid resin fouling. Although chloride-arsenate ion exchange is simple in concept, the following issues need to be addressed before anion exchange becomes a widely accepted treatment choice for As removal: (1) choice of resin, (2) effect of multiple contaminants such as As and nitrate, (3) effect of sulfate concentration, (4) optimum empty bed contact time (EBCT), (5) minimization of As leakage, (6)

Arsenic removal from water/wastewater using adsorbents—A critical review

“…Arsenic removal technologies were reviewed ( [9,26,27,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]576]). The major arsenic removal technologies are compared in Table 2.…”

Preparation of iron-impregnated granular activated carbon for arsenic removal from drinking water

“…Technologies, including precipitation/coprecipitation, ion exchange, membrane filtration, and adsorption, have been developed to remove arsenic from drinking water [9][10][11][12][13][14][15][16][17]. Activated carbon is widely used to control odor/taste and remove contaminants in water treatment processes because of its huge specific surface area and well-developed pore structures [18].…”

Removal of As(V) by Cu(II)-, Ni(II)-, or Co(II)-doped goethite samples

“…Because of this, the removal of As from water supplies has become increasingly important. Various approaches have been developed recently, including coagulation with conventional iron and aluminum salts such as ferric chloride and aluminum sulfate [3], lime precipitation [4], ion exchange [5], selective membrane methods [6], adsorption onto metal oxides or hydroxides in fixed-bed filters [7], and various biological approaches [8]. The adsorption process [9] is one of the simplest techniques usually suggested for removal of As(III) or As(V) anions.…”