Sewage water is drawn from residences and commercial buildings. The sources of domestic wastewater include the toilet, laundry, dishwashers, plumbing fixtures, and so on. In the commercial setting the water comes from a wide range or sources including manufacturing plants, restaurants, hospitals, and so on. In a sewage water treatment system, water (comprising about 90% of the effluent) is separated from the solid waste before being reused or disposed of.
For every region, state or country there are a number of guidelines that govern the setting up and maintenance of the treatment plant. You need to be in touch with the local authorities so as to know what exactly applies for your area. Most on-site plants that are installed comprise a two-stage process. Those that serve cities and townships are usually more advanced and incorporate four levels of treatment.
In the first stage, also known as the primary stage, large objects are removed using fine screens. These typically include wood, plastic and rags. Aeration is then done to remove the fine particles which mainly comprise grit and sand. More solid waste is removed through the process of sedimentation. The solid that settles at the bottom of the tanks is referred to as sludge.
The effluent from the primary stage is pumped into another set of tanks (or digesters). These tanks contain both aerobic and anaerobic bacterial organisms. The bacteria help to break down any organic materials and to rid the effluent of nutrients. Sedimentation is repeated to remove solid waste further and form more sludge. The water that settles at the top is referred to as secondary effluent and is released to a large holding pond.
The tertiary stage helps in optimizing on the effects of the other stages by use of biological filters. These filters reduce organic content further and also help to reduce the levels of grease, oil, foam and ammonia. The effluent is disinfected using chlorine, UV radiation and ozone. Collectively, these process help to improve on the color and to eliminate odor. The water from this stage is considered safe for disposal.
There may be a few differences in the exact processes involved when one considers different treatment plants but the end results appear to be comparable for the most part. A major difference that exists is the use of enzymes rather than microorganisms in the secondary and tertiary stages. A predetermined blend of enzymes is added to help break down the organic matter before the effluent is disposed of.
A number of disadvantages have been seen with the use of enzymes as opposed to microorganisms in the treatment process. One of the disadvantages is the fact that this process is less effective compared to those based on microorganisms. This is because it may not be possible to have all the enzymes required to breakdown all the organic matter in the effluent. Microorganisms can easily synthesize all the enzymes required. The other disadvantage is that the enzyme system is more expensive.
The available options for sewage water treatment include setting up your own onsite plant or connecting to the local area sewerage line. Due to the high level of expertise and high maintenance costs involved in setting up advanced systems many people opt for a two stage system. It is important to be aware of the installation guidelines that apply in your area before embarking on the task.
For every region, state or country there are a number of guidelines that govern the setting up and maintenance of the treatment plant. You need to be in touch with the local authorities so as to know what exactly applies for your area. Most on-site plants that are installed comprise a two-stage process. Those that serve cities and townships are usually more advanced and incorporate four levels of treatment.
In the first stage, also known as the primary stage, large objects are removed using fine screens. These typically include wood, plastic and rags. Aeration is then done to remove the fine particles which mainly comprise grit and sand. More solid waste is removed through the process of sedimentation. The solid that settles at the bottom of the tanks is referred to as sludge.
The effluent from the primary stage is pumped into another set of tanks (or digesters). These tanks contain both aerobic and anaerobic bacterial organisms. The bacteria help to break down any organic materials and to rid the effluent of nutrients. Sedimentation is repeated to remove solid waste further and form more sludge. The water that settles at the top is referred to as secondary effluent and is released to a large holding pond.
The tertiary stage helps in optimizing on the effects of the other stages by use of biological filters. These filters reduce organic content further and also help to reduce the levels of grease, oil, foam and ammonia. The effluent is disinfected using chlorine, UV radiation and ozone. Collectively, these process help to improve on the color and to eliminate odor. The water from this stage is considered safe for disposal.
There may be a few differences in the exact processes involved when one considers different treatment plants but the end results appear to be comparable for the most part. A major difference that exists is the use of enzymes rather than microorganisms in the secondary and tertiary stages. A predetermined blend of enzymes is added to help break down the organic matter before the effluent is disposed of.
A number of disadvantages have been seen with the use of enzymes as opposed to microorganisms in the treatment process. One of the disadvantages is the fact that this process is less effective compared to those based on microorganisms. This is because it may not be possible to have all the enzymes required to breakdown all the organic matter in the effluent. Microorganisms can easily synthesize all the enzymes required. The other disadvantage is that the enzyme system is more expensive.
The available options for sewage water treatment include setting up your own onsite plant or connecting to the local area sewerage line. Due to the high level of expertise and high maintenance costs involved in setting up advanced systems many people opt for a two stage system. It is important to be aware of the installation guidelines that apply in your area before embarking on the task.
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