摘要
离子交换法净化含硝酸盐地下水时产生大量高硝高盐废水,为避免其危害环境,利用添加了不同载体(Ti O2和α-Fe2O3)的耐盐改性颗粒活性污泥,生物反硝化去除含0.5 mol/L氯化钠和0.25 mol/L碳酸氢钠的模拟高硝高盐再生废水中的硝酸盐,生物反应器出水经深度处理过程高效去除水溶性有机物(SOC)、悬浮物及微生物后,循环利用于再生树脂。结果显示,颗粒活性污泥生物反硝化可以处理硝酸盐浓度高达75 mmol/L的再生废盐水,添加α-Fe2O3和添加Ti O2的颗粒活性污泥的反硝化能力分别达2.33和0.93 g NO-3-N/(L·d);生物反应器出水中添加氯化钙形成碳酸钙絮凝体,去除生物反硝化自身所产碱度的同时,絮凝去除67%的水溶性有机物;絮凝后出水经颗粒活性炭过滤和臭氧消毒后,可至少再利用于再生树脂10次而不影响树脂处理含硝酸盐地下水的性能,实现了离子交换树脂再生所产高硝高盐废水的生物脱硝与循环利用。
To mitigate the environmental impact of nitrate-concentrated spent brine produced from ion exchange treatment of nitrate-polluted drinking water,salt-tolerant granular activated sludge promoted with Ti O2 or hematite( α-Fe2O3) was used to biologically treat nitrate-concentrated artificial spent brine composed of 0. 5mol / L sodium chloride and 0. 25 mol / L sodium bicarbonate. The effluent after post treatment to remove soluble organic carbon( SOC),suspended solid and microorganism effectively was recycled to regenerate resin. Result shows that the two types of granular sludge can treat spent brine containing nitrate up to 75 mmol / L,and the hematite-promoted granular sludge had a denitrification capacity of 2. 33 g NO-3-N /( L·d),much higher than that 0. 93 g NO-3-N /( L·d) of the Ti O2-promoted granular sludge. The addition of calcium chloride in the denitrification effluent to form calcium carbonate flocculation can remove biogenic alkalinity and 67 percent of soluble organic carbon produced in the denitrification. The effluent after granular activated carbon filtration and ozone disinfection is capable of recycle at least 10 times for resin regeneration without reducing its capacity for processing nitrate-polluted raw water. This study achieves the purpose of biological treatment and recycle of nitrate-concentrated spent brine produced from resin regeneration.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第5期2303-2309,共7页
Chinese Journal of Environmental Engineering
