Figure 13

Percentage (95% CI) of samples meeting WHO guidelines for arsenic removal in situ, membrane and electrolytic technologies. (1)SAR(Gupta), subterranean arsenic removal [52]; (1)SAR(V.Halem), subterranean arsenic removal [51]; (2)LPN1 – (2)LPN4, low pressure nanofiltration for four sites [22]; Electro, electrocoagulation [53].