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Use of Biostimulants and Buffers for Upset Recovery in Paper Mill Wastewater Systems

By Heather Jennings, PE

Industrial pulp and paper wastewater is considered one of the more challenging waters to treat using biological methods, which depend on microbial activity to effectively remediate the wastewater.

Wastewater treatment systems are often influenced/impacted by increased hydraulic and/or COD (chemical oxygen demand) loading as mills add new chemicals or otherwise modify mill operations. These events oftentimes inhibit the wastewater microbial activity, causing “upsets” and, potentially, discharge-limit violations. However, providing the necessary biostimulants and buffers to the microbial system—as we describe in this case study from a paper mill in China—can significantly improve system-upset recovery time and overall operational stability. Continue Reading

Our Most Popular Case Studies

Bioremediation can improve the activity and reproduction of wastewater microbiology. The following case studies used bioremediation to improve wastewater treatment conditions and operating costs.
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Are You Using Wastewater Bioindicators?

By Jael Batty

Water quality can be evaluated quickly, efficiently, and cost-effectively through the use of bioindicators. The presence and activities of microorganisms can indicate changes in system operations and point to the source and magnitude of an issue.1

amoebae

amoebae

Protozoa

Approximately 4% of the microorganisms in wastewater are protozoa, which are single-celled aerobic microorganisms. Protozoa improve effluent clarity by digesting suspended particles and bacteria. Read more about wastewater bioindicators

Healthy Bacteria Are Vital to Wastewater Treatment

bacteria

By Jael Batty

Activated sludge is a mixture of microorganisms that come in contact with and digest biodegradable materials (food) from wastewater. Once most of the material is removed from the wastewater, microorganisms form floc and settle out as sludge. Some type of microorganism will always grow in the system. The organisms that will dominate will be the ones that are best suited to the environment.1

Microorganisms that are natural to the wastewater environment play a vital role in the wastewater treatment process. Beneficial bacteria, protozoa, metazoa, algae, and fungi feed on organic material in wastewater, breaking it down. Bacteria clump together, or floc, forming masses that settle and separate from wastewater liquids. This settled mass is called sludge. This week, we’re going to talk specifically about wastewater bacteria. Read more about wastewater bacteria

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