| 摘要 |
Aqueous fluids, such as chemical reaction solutions or effluents from chemical production plants or dye houses, containing organic compounds and salts of polyvalent inorganic acids, preferably sulfates, are adjusted to a pH value in the range below about 4, concentrated by a membrane treatment and separated into an aqueous retentate concentrated with respect to the organic compounds and an aqueous permeate substantially free of organic compounds. Under these strong acid conditions an effective concentration of the organic compounds without the disturbing increase of the osmotic pressure caused by the presence of said salts can be reached. The concentrates can be easily disposed of and the permeats, for example effluents substantially free of any organic compounds can be discharged into a waste water plant for further treatments and purification. |
