Changes

Which description fits best your project?

Wastewater systems for housing generally require a three stage treatment process. The first stage uses a septic tank or other anaerobic process to remove much of the organic matter and solids by settling. The second treatment stage utilizes biological treatment where much of the remaining pollution is reduced through microbial action. Prior to discharge to the environment, the wastewater must be disinfected in the third stage of disinfection. Common treatment technologies for housing include the following:

|-

| ''Primary Treatment''

|

| ''Secondary Treatment''

*[[Technology|Aerobic Treatment]]

Public markets generate high strength wastewater. Flows from meat, fish and vegetable stalls, and public toilets contain high concentrations of solids and organic matter. Additionally, food preparation stalls generate grease as well as solids and organic matter. Wastewater systems for markets must be flexible enough to handle widely varying flow conditions, from almost no flow when the market is shut down, to peak flows on key market days. Public market wastewater systems require a four step process: pretreatment, primary treatment, secondary treatment and disinfection. Below are common technologies for public market wastewater systems:

Slaughterhouses generate very high strength wastewater. Flow conditions and additives of high volumes of disinfectant require robust wastewater treatment systems. Slaughterhouses use a four step wastewater treatment process: pretreatment/sequestration, primary treatment, secondary treatment, and disinfection. There are valuable byproducts that can be realized from slaughterhouse wastewater, including animal feeds from the collected blood, biogas from the waste digestion process, and fertilizer from the processed biosolids. Following are some technologies commonly used to treat slaughterhouse wastewater:

Medical facilities may have complex wastewater management requirements. Medical wastes from treatment and operating rooms and hazardous wastes from laboratories must be segregated and managed in separate licensed facilities. Food service and laundry operations will require appropriate pretreatment devices including grease and lint traps. Additionally, the use of disinfectants in large quantities may have an adverse impact upon microbial growth, making biological wastewater treatment less effective. Below are common technologies for hospital and healthcare wastewater systems:

The hospitality industry presents some challenges in wastewater treatment due to moderately high strength and flow variability. Wastewater from food service operations requires grease management through grease traps under sinks or outdoor grease interceptors. Laundry operations require lint traps to keep the solids from the washing and drying process out of the wastewater stream. Understanding flow variability from day to day and season to season is critical when selecting appropriate wastewater treatment technologies. Wastewater treatment from the hospitality industry requires a four step process: pretreatment, primary treatment, secondary treatment and disinfection. Following are common technologies used to treat wastewater from the hospitality industry:

Wastewater from office buildings is generally low strength with regular and predictable flows. Treatment systems require a two step process: primary treatment and secondary treatment. Often, flow equalization is used to average out the peaks and valleys to provide average flow into the treatment process. Common technologies for office building wastewater systems include the following:

Schools represent challenging problems for wastewater management as wastewater flows are highly variable. The volume of wastewater discharged during the average school day may be the typical flow, but the wastewater system must also be able to handle low flows during weekends, peak flows during special events, and sometimes no flows during summer vacation. Flow equalization, or moderating peak flows through time-dosing, is one strategy. Engineers must take into consideration the flow pattern throughout the year when designing wastewater systems for schools.

Community wastewater treatment systems receive flows from multiple sources, residential or commercial. Combining flows from multiple sources tends to even out flow variability. Community sewerage projects often use a four step process for treating wastewater. This includes pretreatment devices installed at targeted businesses, primary treatment, secondary treatment and disinfection. Systems that discharge treated wastewater into the environment may require added disinfection components. Below are some typical technologies for community wastewater treatment: