Pulp and Paper

Oxygen demand serves as the main benchmark for measuring organic pollution in effluent. EnviZyme offers products and technical expertise to target a wide range of organics contributed by production activities upstream for:

• Compliance with tightening discharge limits and elimination of permit violations
• Enhanced plant stability for less frequent and less severe upsets
• Proper floc formation and improved settleability
• Improved performance in cold or variable weather and for mills’ highly complex industrial effluent

Removal of ammonia, nitrites, and nitrates is an important and difficult process to maintain. Sources of nitrification problems include environmental factors, toxicity, solids washout, and loading variation, but EnviZyme can help. We offer solutions to:

• Make the nitrification and denitrification processes more robust, enabling on-site plants to withstand higher loading
• Shorten the on-site recovery time after process upsets
• Reduce the impact of shock loads on effluent quality
• Eliminate ammonia-related permit violations, limits for which are becoming more stringent
• Increase the lifespan of critical pieces of infrastructure by preventing ammonia-related corrosion

A well-developed microbial community can take weeks or months to become established with only native microorganisms, and to operate as efficiently as possible, it is important to have the right microorganisms. EnviZyme offers products to:

• Allow the start-up or upset recovery period to happen faster and with greater predictability
• Avoid production delays for pulp and paper mills
• Jumpstart or recover the ability to remove organics within the designed hydraulic retention time
• Foster formation of good floc that settle well
• Eliminate reliance on seed sludge, which can require an adaptation period or contain filamentous organisms

Pulp and paper operation odors will vary based on the particular fatty acid soap produced in the process. Often the best treatment solution involves dosing the wastewater further upstream, such as directly into the primary clarifier. EnviZyme products:

• Target odors biologically by metabolizing the odor molecules themselves, while also degrading the source of malodors
• Are effective against volatile fatty acids (valeric, butyric, and acetic acids)
• Are effective against sulfur-based odors like hydrogen sulfide and mercaptans, which are detectable at extremely low concentrations
• Provide continuous, long-term odor control and prevention
• Mitigate impact on local communities

Foaming is a multifaceted problem with several potential triggers—like overabundance of filaments, surfactants, or EPS—and consequences. EnviZyme offers the expertise and products to correct foaming as efficiently as possible to:

• Maintain proper floc formation and improve settleability
• Keep parameters like TSS and BOD in check, along with optimum solids inventory
• Protect oxygen compressors from foam entry, which can be a fire risk
• Minimize impact on costs from skimming, hauling, and synthetic defoamers
• Avoid additional housekeeping and malodor

Treatment plants require a delicate balance of nutrients in order to support a healthy biomass and achieve optimal efficiency. EnviZyme offers products that provide essential micronutrients to supplement the basic metabolic needs of wastewater biology and ensure an optimized nutrient (C:N:P) ratio.

• Stabilizes biological populations and nutrient-deficient conditions
• Mitigates filamentous bulking associated with nutrient deficiencies
• Reduces plant sensitivity and aids in smooth start-up
• Increases and sustains the biomass bacterial activity
• Supports COD/BOD removal

The pulp and paper industry generates approximately 100 pounds of sludge (dw) for every ton of paper products produced. As costs continue to increase, urban areas offer fewer disposal options, and stricter regulations necessitate higher standards of treatment. EnviZyme offers both enzymatic and biological solutions to:

• Improve dewatering performance for all plant sizes and sludge types
• Reduce volume for lower handling or disposal costs
• Lengthen hydraulic retention time and increase aqueous phase
• Recover capacity of lagoons and defer costly dredging
• Decrease costs associated with polymers and energy input