Affiliation(s)
1. Environmental Health Departments, College of Health Science, The Public Authority for Applied Education and Training, Faiha 72853, Kuwait
2. Kuwait Institute for Scientific Research, Water Technologies Department, Safat 13109, Kuwait
ABSTRACT
All wastewater treatment plants in Kuwait utilize the activated sludge
processes in the removal of organic matter and nutrients from domestic sewage. The
efficiency of solid liquid separation in the activated sludge system is
determined by the ability of sludge constituents to remain flocculated and to
settle fast. In Kuwait’s wastewater treatment plants, solids separation problems may occur in activated sludge system, such
as bulking sludge, which affects the quality of the secondary effluent. The main aim of this
paper is to study and analyze sludge settling and rising behavior in the
activated sludge process of Jahra sewage treatment plant. The results indicated
that clarifier effluent has significant suspended solids carry-over, which is
eventually removed in the sand filtration process. In addition, test results
showed poor settlement of clarifier sludge. The poor sludge settling is related
to insufficient oxygen level in the aerators. Suggestions were made to raise
oxygen level particularly in the aeration unit.
KEYWORDS
Sludge, sewage, treatment, carry-over.
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