Operation and advantages of wastewater treatment plants with active sludge - I part

Various wastewater treatment plants operate in different manner, depending on the applied wastewater treatment technologies.Wastewater is treated in biological treatment plants using biological methods and microorganisms. Currently, all biological plants operate using active sludge (also called active, operating).

Active sludge

Active sludge comprises of wastewater particles and microorganisms, present in a certain part of wastewater treatment plant. These microorganisms also vegetate in natural environment, however they find favorable environment in biological wastewater treatment plants, i.e. they are saturated with air and wastewater.Concentration of microorganisms is considerable, as favorable conditions ensure rapid decomposition of wastewater.Veikia be chemijos

Chemical-free operation

Systems with active sludge are classified as intensive wastewater treatment systems. During various treatment stages, all harmful chemical materials are dissociated, therefore water is pure enough to outlet it into the soil or to collect it in reservoirs and re-use, e.g. for car wash, watering of flowers.Biological wastewater treatment plants using active sludge enable rejection of any chemicals during the wastewater treatment process and high level of wastewater treatment.Please note not all wastewater treatment plants feature such high parameters of treated water. Application of active sludge technology requires no additional filters and other equipment (unless requested by the client or project conditions). This is a cost-effective and environment-friendly method.All processes of biological treatment (treatment of wastewater with active sludge, separation of sludge from treated wastewater and returning of sludge into the aeration reservoir (where wastewater is mixed with active sludge, supplying air) proceeds in one reservoir. Therefore equipment features reliable and stabilized operation.Active sludge decomposes contaminants and is separated from treated wastewater. Favorable conditions for this separation are formed, therefore problems such as disturbances of treatment equipment, outflow of active sludge, unpleasant odor etc. are avoided. However not all wastewater treatment plants are secured from outflow of sludge, therefore you should contact producers and inquire on technological solutions solving this problem, e.g. August ir Ko UAB wastewater treatment systems are equipped with funnel-shaped separation zone. Since the sludge features heavier weight, it settler at the bottom of equipment and is returned into the treatment process or its surplus is removed. At the same time the treated water (also called “technical”) is outlet via a pipe installed at the top of the system – water is outlet to the environment or collected for further application.

Extremely pure water

During various biological processes (nitrification, denitrification, etc.) active sludge removes from wastewater the nitrates, phosphorus (located in, e.g. washing powder), nitrogen (present in urine, excrement, etc.) and other materials delivered with sewerage.Removal of materials, such as phosphorus and nitrogen is very important, as these materials can access water bodies and increase the growth of plants, thus reducing the volume of oxygen in water bodies. This usually results in reduction of fish and other wildlife in lakes and rivers (e.g. they suffocate more often in winter, as intensive greenery absorbs oxygen), thus disturbing the balance in water bodies.Not all wastewater treatment plants are capable of cleaning wastewater from nitrogen, phosphorus and other materials, as they are not equipped with nitrification, denitrification and other zones, therefore they may need filters or other auxiliary equipment, imposing additional costs. Thus wastewater treatment plants with active sludge are convenient and efficient, as the treated wastewater is turned into odorless and colorless water, free from materials harmful to environment.  

Single refill

Active sludge is poured into the newly mounted wastewater treatment plant, before inletting wastewater. Active sludge is delivered from ready operating plants. This is a single action, as the sludge is nourished and reproduces using wastewater; no additional refill is needed. Full efficiency of wastewater treatment is obtained instantly.

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Operation and advantages of wastewater treatment plants with active sludge - II part

Biological wastewater treatment plants with active sludge are often selected for their simplicity and effective treatment of wastewater. Moreover, these systems are compact in size and simple to deliver and mount, even by yourself.


Resistant to variations of volume of wastewater

Automatic operation of wastewater treatment plant with active sludge, resistant to variations of volume of wastewater during the day is extremely practical. For example, in the morning you have a shower, whereas you only use a toiled during the day, and in the evening you wash your dishes and bath a baby.Exploitation of wastewater treatment plant generates surplus of active sludge. When you select the right size biological wastewater treatment plant, the volume of surplus sludge from the smallest plant designed for a 4-person family will be approximately 1 m3 annually. However if you select wastewater treatment system which is too small to satisfy your needs, the volume of surplus sludge may increase, therefore you will have to remove it more often.Sludge is removed opening the lid of wastewater treatment plant. This can be done by the maintaining specialists or the owner himself.

Resistant to chemicals

Biological wastewater treatment plants with active sludge are resistant to chemicals, therefore you can use all domestic chemicals – dish washing liquids, washing powder, shampoos, soaps, etc.Even toilet paper does not disturb the treatment process, however there are some materials that must not enter the wastewater treatment system. They can block or damage your sewerage system in some other way. Remember: your sewerage and wastewater treatment plant does not mean a trashcan.For example, items such as diapers, condoms, hygienic liners, cigarette ends, plastic, paper and other materials insoluble in water must never enter the sewerage and sinks. Never pour remains of paint, grease or other similar materials to sewerage.

Compact and simple

Biological wastewater treatment plants with active sludge are compact in size. E.g. wastewater treatment plant designed for individual house is approximately 1,5-2 m in diameter and approximately 2 m in height. The only part of plants observed on the surface is the lid. If the plant operates and is used correctly, its operation is invisible – no noise or unpleasant odor is emitted.Naturally, the size of plants designed for hotels, restaurants and other large-scale objects is greater, however the treatment technology enables to reduce the size of plants, compared with other treatment technologies (e.g. septic).Wastewater treatment plants designed for individual houses are simple to transport and mount even yourself, according to the manufacturer’s drawings.

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