Nawghare P, Rao N N, Bejankiwar R, Szyprkowicz L, Kaul S N
National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2001;36(10):2011-26. doi: 10.1081/ese-100107444.
The results of treatability studies viz., Fenton reaction and physico-chemical (coagulation) treatment using lime, alum, Fe salts and polyaluminium chloride (PAC) performed on wastewater generated from a unit manufacturing technical grade phosphoric acid are reported. Due to low biochemical oxygen demand (BOD) chemical oxygen demand (COD) ratio and very low pH, this wastewater is not amenable for biological treatment. The treatability studies indicated that it is possible to remove 75-80% COD using Fenton's reagent at optimum doses of 1.0 g/L FeSO4 and 2 ml of 30% H2O2. Simultaneously, significant quantities of suspended solids, phosphate and fluoride are also removed. Polyaluminium chloride is found to be more effective towards suspended solids (SS), COD, phosphate and fluoride removal, when compared to other coagulants used in the present study. Addition of an anionic polyelectrolyte (Magnafloc 156) to PAC improved the performance further. A treatment scheme that consists of neutralization (pH 4) + Fenton's reagent + neutralization (pH 7.5) + PAC/Magnafloc 156 is found to be effective in treating phosphoric acid plant wastewater to meet marine discharge standards.
报告了对一家生产工业级磷酸的工厂产生的废水进行的可处理性研究结果，即芬顿反应以及使用石灰、明矾、铁盐和聚合氯化铝（PAC）进行的物理化学（混凝）处理。由于生化需氧量（BOD）与化学需氧量（COD）的比例较低且pH值极低，这种废水不适用于生物处理。可处理性研究表明，在1.0 g/L硫酸亚铁和2 ml 30%过氧化氢的最佳剂量下，使用芬顿试剂可以去除75 - 80%的COD。同时，还能去除大量的悬浮固体、磷酸盐和氟化物。与本研究中使用的其他混凝剂相比，发现聚合氯化铝对去除悬浮固体（SS）、COD、磷酸盐和氟化物更有效。向PAC中添加阴离子聚电解质（Magnafloc 156）可进一步提高性能。发现一种由中和（pH 4）+芬顿试剂+中和（pH 7.5）+ PAC/Magnafloc 156组成的处理方案在处理磷酸厂废水以达到海洋排放标准方面是有效的。
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