Lange, Clifford

Dr. Clifford R. Lange is the Director of the Advanced Analytical Laboratory at Environmental Business Specialists. Before joining EBS in 2019 , Dr. Lange was a faculty member in the Department of Civil Engineering at Auburn University for 26 years. His research focuses on the effects of inhibitory chemicals on biological wastewater treatment processes.

Titles from this speaker

Description: Effects of Free and Complexed Quaternary Ammonium Surfactants on Aerobic Wastewater...

Effects of Free and Complexed Quaternary Ammonium Surfactants on Aerobic Wastewater Treatment Processes Treating Poultry Processing Wastewater

Abstract

Due to their biocidal properties, quaternary ammonium compounds are widely utilized by the poultry production and processing industry to kill pathogenic bacteria. As most of these compounds are slowly bio-degraded, if at all, they eventually wind up in the wastewater from these plants. These compounds are used as biocides because they efficiently kill bacteria, so it is not surprising that they inhibit the metabolism of aerobic wastewater treatment processes. Seventy three percent or 26 poultry wastewater sample tested had detectable concentrations of quaternary ammonium surfactants. A variety of quaternary ammonium species were detected in the samples, with cetyl pyridinium chloride being the most common, followed by several benzalkonium species. The relationship between quaternary ammonium surfactants and biomass inhibition was assessed by measuring the metabolic indicator adenosine tri phosphate (ATP). Reductions in ATP formation rate indicate inhibition of the biomass. The ability of using total QACs to predict the potential for poultry wastewater treatment process inhibition is not good. Differences in partitioning between solids and the more bio-available free-form skewed the response and would make predictions less accurate. Free QAC measurements do a much better job of predicting the inhibition of an aerobic poultry wastewater treatment process. There is approximately a 10 percent reduction of biomass metabolism for every mg/L of free-QAC present. While the correlation is much better than for total QACs, there was still a large degree of variability

SpeakerLange, Clifford

Presentation time

14:30:00

15:00:00

Session time

11:30:00

12:30:00

SessionApplication of Innovative Process Technologies in the Food and Beverage Industry

Session number9C

TopicIndustrial Issues and Treatment Technologies

Author(s)

C.R. Lange

Author(s)C.R. Lange1;

Author affiliation(s)Environmental Business Specialists, AL1

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2020

DOI10.2175/193864718825157374

Volume / Issue

Content sourceWEFTEC

Word count18

Description: Factors Effecting Nitrogen Fixation in Pulp and Paper Mill Aerated Stabilization...

Factors Effecting Nitrogen Fixation in Pulp and Paper Mill Aerated Stabilization Basins

Abstract

The aerated stabilization basins (ASBs) utilized for treating pulp and paper wastewater are typically rich in carbohydrates and poor in available nitrogen. Historically, supplemental nitrogen has been added to improve the rate and degree of biological treatment. However, several ASBs have been operated with no exogenous nitrogen addition with little or no adverse effects. In this paper, the genera and numbers of heterotrophic nitrogen fixing bacteria in 17 pulp and paper mill ASBs were determined. Nitrogen-fixing bacteria were detected in all 32 samples from 18 different mills. The genera and numbers of nitrogen fixing bacteria were widely varied, but appeared to be well correlated with redox, nitrogen content, and organic loading of the sample site. The rate of nitrogen fixation was reasonably well correlated to nitrogen deficiency, HRT, and BOD loading, was poorly coordinated to redox.

SpeakerLange, Clifford

Presentation time

13:20:00

13:40:00

Session time

13:00:00

13:40:00

SessionPulp and Paper Wastewater Treatment Issues

Session number602

TopicIndustrial Issues and Treatment Technologies

Author(s)

C.R. LangeC.R. LangeM. Foster