What You Should Know About A Waste Water Purification System

By Martha Lewis


Waste water may be collected from homes or commercial properties. Toilets, dishwashers and plumbing fixtures are among the largest contributors of sewage water in the home setting. Manufacturing plants form the bulk of the sewage that originates from commercial premises. A waste water purification system helps to separate the solid waste from the water so that the latter can be reused.

There are several stages that the effluent has to be taken through during the purification process. These are screening, primary, secondary and tertiary stages. Screening involves the removal of large inorganic objects such as plastic, pieces of cloth and large rocks. This process is continued at the primary stage where the smaller particles (mainly sand and grit) are removed through sedimentation and aeration. The waste that is left thereafter is known as sludge.

The effluent from the primary stage flows into another set of tanks where secondary filtration takes place. These are what are known as digesters. The digesters contain live cultures of both aerobic and anaerobic bacterial microorganisms. The microorganisms breakdown the organic material in the effluent which effectively reduces the nutritional content and the survival of microorganisms in the subsequent stages. Secondary effluent is then released to the tertiary stage.

The fourth and final stage involves a number of processes. Biological breakdown of materials is optimized in this area through the use of biologic filters. The other important process that occurs here is a reduction in the levels of foam, oil, grease and ammonia. Disinfection is then performed to make the water safe for reuse. This is achieved through chlorination and UV radiation. Collectively, these processes clear the murkiness.

Odor is produced during the process of digestion. One of the commonest gases that results in the production of odor is hydrogen sulfide. Carbon reactors are usually used to get rid of this odor. Contact media lined with bio-slimes and pellets of chlorine are incorporated into the reactors. Alternatives that may be considered include calcium nitrate and hydrogen peroxide.

There are variations that exist in the exact processes but the result is largely the same. One of the alternative purification systems employs the use of enzymes rather than bacteria in the breakdown of organic matter. One of the disadvantages of using this option is that it is not practically possible to have all the enzymes required in the blend. Another disadvantage is that producing enzymes is more expensive than using the bacteria.

Treated water is mainly used for agricultural activities once it leaves the plant. With proper technology, it can be reused for domestic purposes. Sludge is also treated before being disposed of. Small scale plants carry this out through composting while aerobic and anaerobic digestion are used for mid-sized and large plants. Incineration may be used in rare circumstances.

As you plan on installing your onsite treatment plant, you need to be conversant with the rules and regulations set by the local authority. These rules tend to vary from place to place. The methods that are employed in the process should be similar to what would occur in the natural environment. Ensure that you organize regular inspection by the public health department.




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