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Assessment of the operational performances of two activated sludge systems in Kuwait

  • Adallah Abusam
  • Andrzej Mydlarczyk
Article
  • 52 Downloads

Abstract

Activated sludge systems (ASSs) are the most globally used wastewater treatment systems. However, there is very little information about the operational practices of ASSs in developing countries. This paper presents how the Riqqa and Umm-Al-Haiman ASSs, in Kuwait, are operated and the methodology used to evaluate and compare their performances. Over a period of 9 months, weekly samples of the influents, aeration tank mixed liquors, and secondary effluents were collected and analyzed according to standard methods. Accordingly, the operational variables of the systems were estimated. The obtained results indicate that the plants were not operated within their recommended design values. The Riqqa ASS was inadequately aerated and hydraulically and organically overloaded, while the Umm-Al-Haiman ASS was operated at a very high mixed liquor suspended solids (MLSS) value. The method used by this study proved to be useful for identifying the operational problems of the studied ASSs, and it can be used to evaluating the performances of other ASSs.

Keywords

Municipal wastewater Secondary treatment Extended aeration Oxidation ditch Operational variables Evaluation 

Abbreviations

ASP

Activated sludge process

ASS

Activated sludge system

BOD

Biological oxygen demand

COD

Chemical oxygen demand

CODin

Chemical oxygen demand concentration of the influent

DO

Dissolved oxygen

EC

Electrical conductivity

F/M

Food to microorganisms ratio

H2S

Hydrogen sulfide

HRT

Hydraulic retention time

MCRT

Mean cell residence time

MLSS

Mixed liquor suspended solids

MLVSS

Volatile mixed liquor suspended solids

NH4-N

Ammonia nitrogen

NO2-N

Nitrite nitrogen

NO3-N

Nitrate nitrogen

O & G

Oil and grease

OL

Organic load

pH

Parameter showing H+ activity in water

Qin

Wastewater influent flow rate

Qw

Wasted activated sludge flow rate

RAS

Re-circulated activated sludge

SBR

Sequencing batch reactor

SRT

Solids retention time

STD

Standard deviation

Temp

Temperature

TN

Total nitrogen

TP

Total phosphorous as PO4

TSS

Total suspended solids

TSSe

Effluent total suspended solids

TSSr

Re-circulated total suspended solids

V

Volume

VFAs

Volatile fatty acids

VSS

Volatile suspended solids

WAS

Wasted activated sludge

WWTPs

Wastewater treatment plants

Notes

Funding information

The study was supported by the Kuwait Foundation for the Advancement of Sciences (KFAS) under the Code 2012-1405-02.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Wastewater Treatment and Reclamation Technology (WTRT) Program, Water Research CenterKuwait Institute for Scientific Research, KuwaitSafatKuwait

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