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080 - 6570 3831 / 4203 6877               +91 - 95382 86668        

080 - 6570 3831 / 4203 6877

+91 - 95382 86668

Sewage Treatment Plant for Shopping Malls

Nowadays, sewage generation from big sized malls has also been increased. Hence, the sewage must be treated and disposed off to avoid water and soil pollution matter. Impact of wastewater generated from malls on the environment is increasing day by day. Hence, it is necessary to implant sewage treatment plant in every shopping mall which produces greater volume of wastewater.

Sewage Treatment Plant for Malls

1. What is sewage treatment?

Sewage treatment is defines as the process of removing the harmful pollutants or contaminants from sewage from commercial, residential and industrial sources to produce liquid and solid which is suitable for discharge into the environment or for reuse.

2. Do you think is it necessary to treat sewage from malls?

Well! The answer is obviously YES. Because, if you fails to treat sewage it can harm human health and natural environment. Hence, it is necessary to treat wastewater/sewage from the shopping malls before it is reused/recycled and or discharged into the environment.

3. What kind of treatment methods involved in STP?

Commercial package sewage treatment plant includes physical, chemical and biological methods.
a. Physical method: It consists of sedimentation, screening, filtration, skimming and etc.
b. Chemical method: It consists of chlorination, neutralization, coagulation, etc.
c. Biological method: It consists of aerobic (activated sludge process, tricking filters, oxidation pond, aerated lagoons, aerobic digestion etc.,) and anaerobic (anaerobic digestion, septic tanks etc.,) processes.

4. Different levels of sewage treatment:

Wastewater/sewage generated from various units of the malls flows to the commercial sewage treatment system via sewer lines. Different levels of treatment involved during treatment process are as follows:
1. Preliminary Treatment Level
2. Primary Treatment Level
3. Secondary Treatment Level
4. Tertiary Treatment Level

The detailed description of each treatment level in Sewage Treatment Plant is shown below:

Conventional treatment levels in STP or Sewage Treatment Plant for Malls Level 1: Preliminary Treatment or pretreatment:
1. Its main objective is to prevent the damage to plant equipments/parts by removing water constituents that found in raw sewage or wastewater.
2. Being a first treatment level, it removes easily separable large suspended solids (rags, bottles, cups, cans and many such) and other materials (oils etc.,) from incoming wastewater called influent.
3. In this level, bar screens are used for screening and hence more percentage of suspended solids are removed.
4. It uses grit chamber to remove excess amount of grit, sand and small stones will settle to the bottom of the chamber.
5. The quality of the effluent obtained at the end of this treatment is not acceptable and hence it should be subjected for further levels of wastewater treatment.

Level 2: Primary Treatment:
1. This is the treatment which needs to be done before wastewater is subjected to secondary treatment level or biological treatment.
2. Pretreated wastewater flows into sedimentation tank or primary clarifiers which uses chemicals like flocculants and coagulants.
3. In order to encourage sedimentation process the flow of wastewater is reduced and hence heavier suspended solids settle to the bottom of the tank and lighter particles rises to the surface are skimmed off.
4. The settled solids is called as primary sludge which will be treated in later stage and the residual liquid is now subjected to next level of treatment.
5. Primary treatment of sewage/wastewater removes approximately 60-65% of suspended solids.

Level 3: Secondary or biological treatment:
1. It involves both aerobic and anaerobic biological treatment where aerobic process called “activated sludge process” is the most commonly used process to reduce organic material.
2. Waste water flows from primary tank will enter into aeration tank to which air is supplied to increase the growth microorganisms like bacteria to break down organic matter.
3. Now aerated wastewater (solids + microorganisms) enter into secondary clarifiers in which heavier solids settle to the bottom of the clarifiers which is called as secondary sludge.
4. Some of the sludge will be redirected to aeration tank for further processing and remaining mixes with primary sludge for sludge digestion process and then disposed off or reused.
5. This stage ensures about 80-85% of organic matter are removed.

Level 4: Tertiary or advanced treatment:
1. This is highest or final treatment level in most of the Sewage Treatment Plants (STP).
2. The main objective of this treatment level is to produce better quality effluent which was not obtained during previous levels.
3. Depending on the quality of the effluent it involves physical or chemical or biological methods to remove left over suspended and dissolved solids.
4. It involved disinfection process to remove residual microorganisms from wastewater before its discharge or reuse.
5. Disinfection is done by using disinfectants like chlorine, ozone, UV light and many such and now treated wastewater called effluent is suitable for discharge into the environment or reuse.

Sewage treatment processes remove a variety of toxins and harmful disease-causing contaminants from sewage/wastewater to make it usable again or to dispose off.

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