PROBLEMS IN PURIFICATION OF OIL SHALE BASIN WASTEWATERS; pp. 433–434

FUNCTIONAL DYNAMICS OF MICROBIAL POPULATIONS IN WATERS CONTAMINATED WITH PHENOLIC LEACHATE; pp. 435–453

METABOLIC AND GENETIC DIVERSITY OF PHENOL-UTILIZING BACTERIA AS AN ENHANCER OF NATURAL BIODEGRADATION IN POLLUTED WATERS; pp. 454–468

STUDY OF THE TOXICOLOGICAL IMPACT OF DIFFERENT COMPONENTS OF ASH-HEAP WATER (SULPHUR RICH PHENOLIC LEACHATE) USING LUMINESCENT BACTERIA AS TEST ORGANISMS; pp. 469–475

BATCH TRIALS TO SIMULATE BIOLOGICAL TREATMENT IN LAGOONS OF LEACHATE FROM OIL-SHALE ASH HEAPS; pp. 476–487

SINGLE SLUDGE ACTIVATED SLUDGE BIOLOGICAL TREATMENT OF CARBON, NITROGEN, AND PHOSPHORUS IN COMBINED MUNICIPAL AND INDUSTRIAL WASTEWATERS FROM THE KOHTLA-JÄRVE REGION OF ESTONIA; pp. 488–508

BIODEGRADABILITY STUDIES OF KOHTLA-JÄRVE WASTEWATERS BY ACTIVATED SLUDGE RESPIRATION; pp. 509–518

BOD MEASUREMENT IN PHENOLIC WASTEWATERS BY USING BIOSENSOR BASED ON IMMOBILISED BACTERIA; pp. 518–525

IMPACT OF OIL SHALE MINE WATER ON MICROBIOLOGICAL AND CHEMICAL COMPOSITION OF NORTH-EASTERN ESTONIAN RIVERS; pp. 526–532

CONCENTRATION OF OIL SHALE ORIGINATED PHENOLS BY SPE; pp. 533–543

DETERMINATION OF PHENOLS BY LIQUID CHROMATOGRAPHY WITH ELECTROCHEMICAL AND UV DETECTION; pp. 544–553

SHORT REVIEW OF INVESTIGATIONS ON THE TREATMENT OF OIL SHALE INDUSTRY WASTEWATERS IN 1960-1990; pp. 554–560