Recovery of Wool Scouring Effluent Utilising Membrane Bioreator (MBR) Technology as Part of the Activated Sludge System followed by Two-stage Reverse Osmosis (RO) Membrane Concentration

As a part of activated sludge system, oxidation ditch has a special form like a canal without end point. Rotor is used to diffuse oxygen from air to the water.

Download Full-text

Parameters for Measuring the Activity and Viability of Activated Sludge

Water Quality Research Journal ◽

10.2166/wqrj.1974.022 ◽

1974 ◽

Vol 9 (1) ◽

pp. 235-249 ◽

Cited By ~ 1

Author(s):

S.G. Nutt ◽

K.L. Murphy

Keyword(s):

Organic Carbon ◽

Activated Sludge ◽

Biological System ◽

Analytical Methods ◽

Heterogeneous System ◽

Removal Rate ◽

Bacterial Species ◽

Atp Content ◽

Culture Studies ◽

Activated Sludge System

Abstract Conventional wastewater parameters are accepted as inadequate estimates of the condition of activated sludge but numerous other indices have been suggested as specific measurements of the activity and viability of the biomass. Literature in the related fields of microbiology and biochemistry were reviewed in order to select the most appropriate activity parameters for application to a heterogeneous biological material. Modified analytical methods were applied to a well-controlled biological system containing a single predominant bacterial species to evaluate the relative merit of each as an indicator of viability and activity. The potential of each parameter in a complex heterogeneous system was determined by monitoring each index in a bench activated sludge system. The predominant culture studies indicated that the ATP content of the biomass and the dehydrogenase activity were potential indicators of cell viability in a simple system. However, in the complex activated sludge system, only the ATP content showed significant correlation to the organic carbon removal rate.

Download Full-text

TREATABILITY OF 2,4-D PRODUCTION WASTEWATERS

Water Science & Technology ◽

10.2166/wst.1994.0067 ◽

1994 ◽

Vol 30 (3) ◽

pp. 73-78 ◽

Cited By ~ 3

Author(s):

O. Tünay ◽

S. Erden ◽

D. Orhon ◽

I. Kabdasli

Keyword(s):

Hydrogen Peroxide ◽

Activated Sludge ◽

Partial Oxidation ◽

Chloride Concentration ◽

Chemical Oxidation ◽

Cod Removal ◽

Optimum Conditions ◽

Organic Loading ◽

Activated Sludge System ◽

Biological Treatability

This study evaluates the characterization and treatability of 2,4-D production wastewaters. Wastewaters contain 20000-40000 mg/l COD, 17000-30000 mg/l chloride and pH is around 1.0. Chemical oxidation with hydrogen peroxide provided almost complete COD removal. The optimum conditions are 3:1 H2O2/COD oxidant dosage, 3000 mg/l Fe3+ as catalyst and pH 3. Partial oxidation at 0.5:1 H2O2//COD ratio is also effective providing 67% COD removal. A batch activated sludge system is used for biological treatability. Dilution is needed to maintain a tolerable chloride concentration which increases through COD removal. pH also increased during COD removal. 85% COD removal is obtained for the 50% dilution at an organic loading of 0.3 day‒1 on a COD basis. Completely and partially oxidized wastewaters are also treated in the activated sludge down to 30 mg/l BOD5.

Download Full-text

Evaluation of the alternative treatment processes to upgrade an Opium alkaloid wastewater treatment plant

Water Science & Technology ◽

10.2166/wst.2000.0032 ◽

2000 ◽

Vol 41 (1) ◽

pp. 223-230 ◽

Cited By ~ 12

Author(s):

M.F. Sevimli ◽

A.F. Aydin ◽

Ì. Öztürk ◽

H.Z. Sarikaya

Keyword(s):

Activated Sludge ◽

Alternative Treatment ◽

Treatment Plant ◽

Post Treatment ◽

Anaerobic Sludge ◽

Processing Plant ◽

Two Stage ◽

Sludge Treatment ◽

Treatment Processes ◽

Opium Alkaloid

The aim of this study is to characterize the wastewater from an opium alkaloid processing plant and to evaluate alternative treatment techniques to upgrade an existing full-scale biological activated sludge treatment plant having problems of high residual COD and unacceptable dark brown color. In this content firstly, long term operational records of the two stage aerobic activated sludge treatment plant of the opium alkaloid factory located in Afyon province of Turkiye were evaluated. The operating results for the last three years were statistically analyzed and median and 95-percentile values were determined for the parameters including chemical and biological oxygen demand (COD and BOD5) and treatment efficiencies. Specific wastewater generation was found as 6.7 m3 per ton of the opium capsule processed. In the following stage of the study, three additional treatment processes were experimentally tested: anaerobic pretreatment, post treatment of aerobically treated effluents with lime and ozone. Pilot scale upflow anaerobic sludge blanket reactor (UASBR) experiments have demonstrated that about 70 percent of the incoming COD can be removed anaerobically. Chemical treatability studies with lime for the aerobically treated effluent have shown that about 78 percent color and 46 percent COD removals can be obtained with lime dosage of 25 gl−1. Post treatment of the effluents of the existing two stage aerobic treatment with ozone also resulted in significant color and COD reduction.

Download Full-text