nutrient removal Archives – Bishop Water Technologies

Social

How to eliminate sewer surcharges with a simple, low-energy system

DATE POSTED: September 3, 2021

Pre-treatment of high-strength wastewater before discharging it to a municipal sewer can be challenging, especially if high levels of BOD, TSS and ammonia are present. But what if a simple, affordable, onsite solution was available to help meet pre-treatment requirements and avoid sewer surcharges?

Bishop Water combines two of its robust, easy-to-use treatment technologies—The Bishop Solids Management Solution and BioCord™ Reactors—to create a scalable solution for a wide range of industrial and commercial applications. The process can handle high solids and nutrient concentrations for a fraction of the capital and operating costs of more complex, energy-intensive alternatives.

How it works

The wastewater first goes to Bishop Water’s Solids Management Solution. Unlike complex, energy-intensive mechanical dewatering equipment, the Bishop approach utilizes a passive dewatering process that achieves a high level of dry solids using only specially selected polymers, Geotube® filtration and gravity.

As the solids are pumped to the Geotubes, a polymer is added to retain non-soluble BOD, TSS, and other contaminants. The Geotubes also provide filtration and release clear water that is low in TSS, but may still contains soluble organics and nutrients.

This nutrient-rich filtrate is then transferred to a BioCord Reactor system for further treatment. BioCord Reactors provide a simple, robust process to remove soluble BOD and ammonia with very little operator oversight.

A BioCord Reactor is simply a modular frame that supports densely arranged strands of polymer fibres. These fibres provide a massive surface area for the growth of aerobic and anaerobic microorganisms that are ideal for enhanced biological treatment and maintaining regulatory compliance – even in cold weather conditions.

This integrated solution can be customized meet the specific size constraints, treatment requirements, and growth plans for each site. The system also incorporates a modular design that can be easily expanded as treatment needs change.

Learn more about Bishop Water’s solids management and nutrient removal solutions.

Quality and quantity: How a BioCord frame delivers strength and value

DATE POSTED: April 29, 2021

When it’s dry, a metre of BioCord weighs almost nothing. But after it’s immersed into a wastewater system and becomes a home for a healthy, active biofilm, it really packs on bulk. Each metre of once-wispy BioCord can weigh as much as four kilograms when it’s fully populated with aerobic and anaerobic microorganisms.

A reactor frame can be fitted with more than 600 metres of BioCord, so it’s easy to see that the supporting frame must be strong to handle the dramatic increase in mass as the biofilm develops.

The Bishop Water team has tested a number of designs and materials to create the optimum BioCord frame that offers the greatest strength, reliability and service life at the lowest cost. For most applications, aluminum offers a strong, but lightweight, frame that can be customized to any size and will support the full weight of the BioCord media along with the active biofilm layer. Overall, the design of our aluminum frames offers the performance of stainless steel, but at about half the weight and half the cost.

All BioCord frames are manufactured in Canada to ensure that we can maintain tight control on quality and delivery times. It also enables us to respond quickly to orders and reduces shipping time and cost.

Our frames are assembled in a modular fashion during the manufacturing process and then prepared for shipping in a flat pack. This arrangement greatly reduces the space required for shipping and the cost. Once the frames arrive at their destination, they can be quickly assembled and then brought to site ready to install. In many cases, a BioCord system can be fully installed in just a few days, while the plant remains in operation.

Learn more about the advantages of BioCord reactors for wastewater treatment.

It’s curtains for BioCord!

DATE POSTED: March 29, 2021

BioCord curtain design enables fast, easy retrofit to enhance CAS basins.

We often refer to BioCord as a condominium for bacteria, suspended in a free-standing aluminum frame that facilitates fast, easy installation into treatment lagoons.

But that’s not the only way that we can configure this versatile nutrient removal system. Another option is the curtain design that enables BioCord to be installed in concrete or steel process tanks to enhance a conventional activated sludge process. These curtains are fixed within the treatment basin, eliminating concerns of carrier washout or clogging that sometimes arise with similar MBBR systems.

In this configuration, we suspend the BioCord media from stainless steel cables that span the width of a process tank. Our process specialists calculate the appropriate amount of BioCord that should be added to the process tank to achieve the target removal rates for ammonia, total nitrogen and BOD.

Once installed, the BioCord media provides a massive surface area on which nutrient-removing bacteria can attach and form a highly efficient and highly concentrated biofilm. The BioCord media is made up of a blend of durable, inert materials, meaning that no replacement of the fibres are required as long as they are not physically damaged. This approach can significantly increase plant performance and capacity within the existing footprint, eliminating the cost of additional process tanks and related equipment.

BioCord curtain systems also require little energy to operate. Unlike similar technologies that use individual carriers to support biofilm growth, BioCord Curtains are fixed in place, and do not require additional energy to keep the media circulating and/or in suspension.

In some cases, the existing aeration system may provide sufficient oxygen to maintain BioCord and the existing activated sludge process. This may If not, the BioCord compressor-powered aeration system can achieve high oxygen transfer to the biofilm for a fraction of the capital and operating cost of typical blower-powered systems.

Learn more about Bishop BioCord Reactors for treatment plant upgrades.

Proving BioCord cold-weather nitrification under highly variable conditions

DATE POSTED: December 11, 2019

What happens when a BioCord™ pilot system experiences operating conditions that are much different than what was expected? Is the data still useful? Is the pilot project considered a success?

These are some of the questions we asked ourselves after looking at the results from a BioCord pilot study performed under highly variable conditions. In the end, we learned that the data was very valuable and proved not only that BioCord can achieve nitrification at temperatures below 1°C, but it can do it under some pretty tough conditions.

The BioCord pilot project was conducted at the wastewater treatment lagoons serving the small town of St. Henry, Ohio, USA. The village was facing serious operational challenges at its four-cell lagoon system, which treats municipal wastewater and effluent from a food processing plant. Despite adding aerators and a mixing unit, the plant was struggling to maintain sufficient ammonia removal during the winter months.

With little space to expand the treatment plant, the community was also concerned about potentially complying with more stringent ammonia limits (1 mg/L) and handling increased hydraulic flows of up to 2x the plant’s rated capacity.

A 1.4 m x 1.4 m x 1.4 m BioCord Reactor was used in the St Henry Pilot Project.

A BioCord pilot system was installed to test its ability to provide a scalable, low-energy, fixed-film technology that could upgrade lagoon performance and increase treatment capacity without expanding plant footprint.

The BioCord pilot system was designed to handle influent ammonia concentrations of about 20-25 mg/L and BOD of 50 -75 mg/L, drawn from Cell 2 of the lagoon system. The pilot ran from September 2017 to May 2018.

BioCord deals with unexpected conditions

But influent concentrations of ammonia and BOD often exceeded the design specifications, especially in the colder months – between November and February. Ammonia was often above 40 and BOD climbed as high as 300 mg/L at times. Our team was concerned that the BioCord system was undersized to handle the higher influent levels.

Yet despite the higher than anticipated influent concentrations and undersized reactor, the BioCord system performed very well. Nitrification was achieved at temperatures as low as 0.5°C and BOD levels were also dramatically reduced. Based on the data and BioCord performance, the team concluded that additional BioCord reactors would have enabled the pilot system to handle the higher-than-expected loading rates and provide desired nitrification.

Learn more about simple, low-energy BioCord Reactors for cold-weather ammonia and BOD removal.

Bishop Water brings Biocord Reactors to New Zealand

DATE POSTED: July 30, 2019

Bishop Water Technologies has signed a memorandum of understanding (MOU) with Southwater Ltd. to provide distribution, installation and technical support for BioCord™ Reactors throughout New Zealand.

About Southwater Ltd.

Southwater is a rapidly growing company that specialises in water and wastewater treatment and dredging services in New Zealand. The addition of BioCord Reactors expands the company’s portfolio of products with a simple, low-energy biological wastewater treatment process for a range of clients in the municipal, industrial, commercial and agricultural sectors.

Pilot Testing Opportunities

The company has already identified several sites that are interested in performing pilot testing with BioCord reactor to remove high concentrations of nutrients from waste streams. In some cases, the BioCord reactor systems will treat filtrate from Geotube® containers that are capturing, dewatering and consolidating process solids. For other projects, the BioCord reactors will be installed directly into wastewater treatment lagoons to enhance the biological removal of ammonia and ensure compliance with regulatory discharge limits for treated effluent.

Why pair Geotube® containers with BioCord Reactors?

The combination of Geotube® containers with BioCord Reactors creates an affordable, easy to operate and highly efficient wastewater treatment system that is ideal as a rapidly deployable packaged offering. Geotube® filtration and containment provides excellent TSS and BOD reduction while also retaining contaminants such as metals and phosphorus. Where further treatment is needed for the Geotube® filtrate, BioCord fixed-film technology provides a high-density, vertically oriented medium on which to establish a stable, concentrated biofilm. Once established, a BioCord system is self-regulating, requires little electricity for aeration, and is resistant to high hydraulic and organic loading.

Learn more about simple, low-energy Geotube® dewatering and BioCord Reactors for wastewater treatment.

Contact Southwater:

021 480 141

rob.grant@southwater.co.nz

http://www.southwater.co.nz

A new twist to optimize biofilm treatment for lagoon augmentation

DATE POSTED: July 2, 2019

As published in Western Canada Water

Biofilm, or fixed-film processes, are not new to wastewater treatment—the approach has been used successfully for decades — and long before activated sludge was introduced.

Left: BioCord media prior to installation at a WWTP.
Right: Layers of microorganisms developed on the BioCord Reactor media.

However, not all biofilm technologies are the same and many experience challenges in achieving low operating costs and optimizing system performance in difficult conditions such as sudden increases in loading, cold water conditions and year-round removal of nitrogen.

Recent developments in fixed film media, system design and aeration have produced a low-cost, low-energy, low-maintenance process that is installed directly into a treatment lagoon to increase capacity and performance without expanding plant footprint.

Developed by Bishop Water Technologies, the BioCord™ Reactor system is a fixed-film biological treatment process that is like a condominium for bacteria. Each reactor supports densely arranged, twisted loops of polymer fibres that provide a massive surface area on which preferred, naturally occurring bacteria can thrive.

Read the full article to learn how an optimized BioCord system can help operators overcome many operational challenges.

BioCord™ pilot system proves mettle for cold-weather nitrification

DATE POSTED: March 26, 2019

A BioCord pilot system has successfully demonstrated its ability to easily and affordably achieve high ammonia removal for an industrial wastewater lagoon during the cold winter months. Winter and early spring typically pose significant challenges for treatment lagoons to remove ammonia and meet regulatory limits in treated effluent.

This site, a petrochemical manufacturing plant in western Canada, operates a three-lagoon treatment plant, designed to reduce high ammonia and organic loads in the wastewater.

For the pilot project, a containerized, plug-and-play BioCord system was set up to treat raw wastewater from the second pond in the lagoon system—the point where nitrogen is highest.

After 14 weeks of operation, the BioCord system demonstrated significantly better performance than the lagoon for reducing ammonia concentrations and other key treatment parameters such as BOD, cBOD, TSS and COD. Even when the temperature of the wastewater fell as low as 2.8C, BioCord was able to achieve 97% reduction of ammonia.

On average, the BioCord Reactor pilot system was able to reduce ammonia concentration in treated effluent to about 13 mg/L, vs. influent concentration of about 38 mg/L. By comparison, treatment pond 2 was only able to achieve an average of 2% ammonia reduction during cold conditions, reducing the concentration from an average of 38 mg/L to 37 mg/L, well above the site’s regulated discharge limit of 30 mg/L.

Data from the study can also be used to design a full-scale, modular BioCord system for the site. Unlike alternative approaches that require additional tanks and energy-intensive blowers, a BioCord system is installed directly into the treatment lagoon, helping to minimize capital costs and eliminating the need to expand plant footprint. This design, along with low-energy compressors, rather than costly blowers enables a BioCord system to consume about 50% less energy than an MBBR system designed to achieve the same level of nutrient removal. The compressors, combined with an integrated aeration diffuser, provide an optimized level of oxygen and mixing to develop a robust, highly efficient biofilm.

Learn more about BioCord Reactors for cold-weather ammonia removal in treatment lagoons.

In western Canada, contact DWG Process Supply:

Bay 110, 44 Riel Drive
Riel Business Park
St.Albert, AB, T8N-3Z8
Phone: 780-460-8433

don.burgess@dwg-process-supply.com

Try before you buy — a simple, low-cost BioCord upgrade for your lagoon

DATE POSTED: February 27, 2019

Now’s the time to install a BioCord pilot system and test the ability of this simple, easy-to-operate biological process to dramatically improve year-round ammonia removal in your wastewater lagoons.

Modular BioCord Reactors are like condominiums for bacteria, incorporating a customizable design that rises up through the water column to suit virtually any treatment conditions and plant design. The reactor frame supports densely arranged loops of polymer fibres that provide a massive surface area on which preferred, naturally occurring bacteria can thrive.

Unlike other attached growth systems, BioCord can be installed directly into the treatment lagoon and does not require costly tanks or blowers to operate. Instead, the system uses energy-efficient compressors that consume only a fraction of the power required by processes such as MBBR.

BioCord requires little operator attention and quickly establishes a large, healthy colony of desirable microbes that effectively remove ammonia and other wastewater constituents such as BOD, COD, TSS and phosphorus.

Test BioCord performance at your lagoon

A BioCord pilot system can be easily installed at any wastewater lagoon to test system performance under site-specific conditions. Following a site assessment, a team from Bishop Water Technologies can install a BioCord pilot system that is capable of treating about 32 m³ (8,400 gallons) of wastewater per day to evaluate its effectiveness at producing treated effluent that will meet the regulated ammonia limit for the site.

A compact BioCord pilot system can be brought to site fully assembled in a standard shipping container or installed in a building or on a pad. The pilot system is fully equipped with all pipes and electrical connections to be quickly connected to an electrical supply and a feed and discharge line for wastewater and treated effluent.

Once connected, microbial growth will begin almost immediately and the system typically achieves results within two to four weeks of commissioning. The Bishop Water team will provide comprehensive installation and commissioning services and will conduct regular sampling, monitoring and maintenance of the system. Within two to four months, the system can provide sufficient operational data to demonstrate its capabilities for cold-weather biological ammonia reduction.

Click here to learn how Bishop Water’s BioCord Reactor system is helping improve ammonia removal at a site in Dundalk, Ontario.

Click here to learn more about Bishop Water’s pilot project in Ohio.

News