Water is a vital resource in the operations of many industrial processes.
The increasing demands for water for agricultural, drinking and industrial processes has put significant strain on global freshwater supplies as the world’s population continues to grow.
In many parts of the world, the demand for water has exceeded the supplies of traditional water sources like groundwater and surface water.
In the U.S.—especially in the Southwest region, including California—the high demands and short supply of water have forced water use restrictions on both industrial and residential water users.
This situation is forcing serious discussions by private entities and governmental agencies to develop strategies to incorporate alternative water sources while implementing more efficient ways to use and reuse water.
Sustainable solutions will be required to mitigate the effects of climate change, reduce habitat degradation and provide for continued global population growth.
Wastewater is becoming recognized as a significant water resource for non-potable applications worldwide. Large centralized wastewater facilities often treat and discharge this resource rather than recycling and reusing it due to the costs associated with transporting the treated water back to the source.
This paradigm shift has led to discussion of the utilization of a decentralized wastewater reuse approach that can be sustainably implemented on a community level as well as in a commercial or industrial setting to optimally capture, treat and reuse this water resource.
Decentralized systems play a pivotal role in an emerging “green, clean, smart” paradigm for water resource design and management.
Recycled water can satisfy many non-potable water demands, as long as the water is adequately treated for the intended application.
In the U.S., the U.S. Environmental Protection Agency and the states regulate different aspects of the treatment of waste-water and have established criteria for reuse water use.
Decentralized Water Reuse Applications
Applications for decentralized reuse water include:
• Cooling water for power generation and oil refineries;
• Process water for industries including textiles, pulp and paper, and food and beverage processing;
• Golf course and landscape irrigation;
• Toilets, cleaning and fire systems in commercial buildings; and
• Residential communities.
The decentralized water reuse approach provides the following benefits for communities and facilities:
• It is performance based, scalable, modular, affordable and adjustable.
• It can be readily deployed with reasonable construction costs.
• Planning is continuous, strategic and adaptable.
• It enables site-specific customized treatment solutions, processes, structures and skills that will most effectively achieve the desired treatment results.
• It fosters collaboration among community, industrial and watershed stakeholders to moderate financial and environmental risk.
As climate change extends the frequency and duration of droughts and storm events, populations grow, and water becomes scarce, centralized treatment systems may not be sustainable.
A sensible decentralized water infrastructure approach can assist in resolving water scarcity and regulatory issues, especially in drought-stricken or rural areas.
New processes and technologies make customized site-specific sustainable onsite systems cost-effective to install and maintain for both communities and facilities. This not only helps meet regulatory requirements, but also saves companies and communities money by reusing water and reducing associated water costs.
Decentralized wastewater treatment and reuse technologies are widely penetrating the market.
Specialized wastewater treatment and reuse systems provide a sustainable infrastructure solution that benefits and supports companies and communities, preserves the environment, and creates a renewable water resource cycle.
A camp operator required an efficient way to treat and utilize the camp’s domestic wastewater to reduce its wastewater discharge fees. The water was to be treated to a standard to be used for non-drinking purposes such as irrigation.
Wastewater analysis parameters included:
• A biochemical oxygen demand (BOD) of 200 to 300 mg/L;
• A chemical oxygen demand (COD) of 90 mg/L;
• Total suspended solids of 100 to 300 mg/L;
• Total ammonia nitrogen of 40 to 80 mg/L;
• Total phosphorus of 7 to 12 mg/L; and
• A pH level of 6 to 8.5.
Genesis Water Technologies (GWT) requested a water analysis to determine the composition of the domestic wastewater source needed to be treated.
The analysis results were reviewed in detail to determine an optimized solution based on the specific types and levels of contamination in each source. This domestic wastewater source was composed of elevated levels of suspended solids, BOD, COD, ammonia nitrogen and phosphorus.
GWT’s local partner consulted with the client and provided a presentation overview and diagram of the customized solution to meet the client’s water quality challenge.
The customized system solution included equalization and primary treatment to remove suspended solids and reduce BOD and COD. Secondary treatment included aerobic oxidation via membrane bioreactor technology followed by filtration and optimized disinfection.
The system was installed and commissioned by the local project manager and contractor, with technical assistance from GWT.
The treated water met all the client’s parameters for both its potable and non-potable water consumption needs.
The treated water stream was microbiologically safe and the client experienced reduced costs; the treated water was utilized for irrigation.