Why Efficient treatment plant for restaurants?
Wastewater coming from restaurants and other food service facilities differ significantly from residential waste-water. Restaurant wastewater being typically higher in strength than residential wastewater also have higher surge volumes during busy periods. The higher biochemical oxygen demand in restaurant wastewater is due to the presence of higher levels of oil, grease and food crumps.
The problem occurs due to the presence of oil and grease thatliquefies at high water temperatures, used to wash dishes. The problem is aggravated with the use of high quality detergents and dish wash soaps which emulsifies oil and grease and thus keeps them in suspension until they enter the leaching stage. Oil and grease on reaching the soil absorption system can clog the soil pores thus preventing both water infiltration and free transfer of oxygen necessary to digest waste.
‘Restaurants, eating joints, banquet halls and hotels in Delhi city will soon have to install effluent treatment plants’ reads a headline published in a leading newspaper. This presses the need of having an efficient treatment plant for restaurants in particular.
Why different treatment plant for restaurants?
The major sources of wastewater produced from any restaurant or hotel are washing of utensils, sink basins, washrooms and other units. 70-75% of this waste is biodegradable and this gets mixed with the remaining non-biodegradable waste at the collection spot.
Hotels and restaurants contribute significant amount of wastewater which needs to be treated using efficient waste water treatment plants to prevent the pollution of surface and groundwater.
Treatment of restaurant wastewater is carried out by a combination of physical, chemical and biological methods to remove organic matter, suspended solids and nutrients from food.
The steps are discussed below-
1: Preliminary Treatment
This removes the coarser particles from raw waste water that may damage the treatment unit. The influent is made to pass through bar screens to remove large floating matter such as plastic bags, sticks, food crumps etc. Comminutors are used to break down these coarser solids.
The velocity of wastewater is reduced and it is made to enter grit chamber for the removal of grit, sand and stones. Oils and greases are also removed before subjecting this treated wastewater to next level of treatment.
2: Primary Treatment
It involves separation of total suspended solids in a sedimentation tank or primary clarifier where heavier particles settle down and oil, grease and other floating material rises to the top and gets removed by skimming process. This effluent is referred to as primary sludge and is subjected to further processing. About 50-70% of total suspended solids and 30% of biodegradable components are removed by this treatment.
3: Secondary Treatment
Micro-organisms are used to decompose suspended and dissolved organic matter by using aerobic biological treatment process called “Activated Sludge Process”. In the continuous supply of air to promote the growth of microbes, breakdown of organic matter takes place. This aerated water then flows into secondary clarifier where 70-80% of organic solids are removed. This is called as secondary effluent.
4: Tertiary Treatment
It is final cleaning process that improves the quality of waste water by the use of disinfectants like chlorination, UV rays, ozone etc. This is an important step which protects human health and environment as well
How can Netsol water help?
We at Netsol water have expertise in wide range of waste water treatment technologies. We can customize wastewater treatment plant for your restaurant that will cater to all your needs and at the same time effectively treat different types of wastewater. We are dedicated to provide hands on service, expert counselling and training to our valuable customers.