SBR treatment of tank truck cleaning wastewater: sludge characteristics, chemical and ecotoxicological effluent quality

ABSTRACT

A lab-scale activated sludge sequencing batch reactor (SBR) was used to treat tank truck cleaning (TTC) wastewater with different operational strategies (identified as different stages). The first stage was an adaptation period for the seed sludge that originated from a continuous fed industrial plant treating TTC wastewater. The first stage was followed by a dynamic reactor operation based on the oxygen uptake rate (OUR). Thirdly, dynamic SBR control based on OUR treated a daily changing influent. Lastly, the reactor was operated with a gradually shortened fixed cycle. During operation, sludge settling evolved from nearly no settling to good settling sludge in 16 days. The sludge volume index improved from 200 to 70 mL gMLSS⁻¹ in 16 days and remained stable during the whole reactor operation. The average soluble chemical oxygen demand (sCOD) removal varied from 87.0% to 91.3% in the different stages while significant differences in the food to mass ratio were observed, varying from 0.11 (stage I) to 0.37 kgCOD.(kgMLVSS day)⁻¹ (stage III). Effluent toxicity measurements were performed with Aliivibrio fischeri, Daphnia magna and Pseudokirchneriella subcapitata. Low sensitivity of Aliivibrio was observed. A few samples were acutely toxic for Daphnia; 50% of the tested effluent samples showed an inhibition of 100% for Pseudokirchneriella.

KEYWORDS:

• Industrial wastewater
• Daphnia magna
• Pseudokirchneriella subcapitata
• Aliivibrio fischeri
• sludge volume index

Acknowledgement

Support by the Belgian Tank Truck Cleaning Commission (CTC) was greatly appreciated.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Michel Caluwé http://orcid.org/0000-0002-1789-2143

Additional information

Funding

PhD grant was supported by the University of Antwerp.