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Hotels & Restaurants

Greywater is all kind of wastewater that contains soap, detergents, oil and other non-biodegradable compounds. The most common sources of generation are showers, bathtubs, sinks, kitchen, dishwashers, laundry tubs, washing machines, etc. Greywater makes up the largest proportion of the total wastewater flow from households in terms of volume. Typically, 50-80% of the household wastewater is greywater. If a composting toilet is also used, then 100% of the household wastewater is greywater.

There are two ways of treating grey wastewater

  • Aerobic treatment (Mechanised treatment) - Inorganica
  • Anaerobic treatment (Natural treatment) - Constructed Wetland


INORGANICA is a modified version of conventional activated sludge processes where primary and secondary clarifiers are specially modified to handle grey-wastewater. In case of strong waste water coming in from community kitchens, provision of chemical coagulation and flocculation are added to the Clarifiers.



Key Features

  • Does not require re-activation in cases of dry run for a number of days
  • A modular and compact design, can be adjusted according to landscape and irregular spaces
  • Available in Plug and Play systems too, by the name of INORGANICA, which is prefabricated in our manufacturing facility
  • Automated INORGANICA plants require minimal human intervention, hence lower operation costs
water recycling
Inorganica site
water recycling
Constructed wetland site
water recycling
Constructed wetland site
water recycling
Constructed wetland site

Constructed wetlands is an old and proven technology for the wastewater treatment. Physical, chemical, and biological processes combine in wetlands to remove contaminants. Greywater treatment is achieved by soil filtration in reed-bed systems which reduces the organic load of the greywater considerably, in addition to decreasing the concentrations of faecal bacteria. If properly designed, these systems would produce a clear and odourless effluent, which can be stored for several days without the need for disinfection. Compared to conventional treatment methods, constructed wetlands tend to be simple, inexpensive and environmentally friendly. They also provide food and habitat for wildlife by creating pleasant landscapes.



Key Features

  • Little Mechanical and Electrical energy requirements.
  • Very less maintenance compared to mechanized treatment
  • Can be constructed in any space and orientation, fits well with the landscape
  • Subsurface flow of waste water ensures no nuisance of mosquitos and insects
water recycling
Schematic Diagram of Constructed Wetland
Parameters (100 KLD plant as reference) Aerobic (Inorganica) Anaerobic (Constructed Wetland)
Technical Aspects **    
Extra Sewage Load Capacity 40 - 60% 10% - 20%
Number of tanks 5 4
Area usage (m2) 45 150
Depth from inlet pipe (m) 2.5 2.2
Total volume of tanks / Total excavation (m3) 120 350
Outcome Quality **    
BOD (mg/l) < 10 < 10
Total suspended solids (mg/l) < 10 < 10
COD (mg/l) < 50 < 50
Oil & Grease (mg/l) < 10 < 10
Outcome Quantity (as a percent of feed volume) 80 - 85 % > 90%
Whether it meets the new norms of PCB Yes Yes
Cost Aspect in (Rs.)    
Initial Cost (100 KLD) * 8 Lakhs 6 Lakhs
Repair & Maintenance (yearly) 0.5 Lakh 0.3 Lakh
Operator (yearly)*** 1.4 Lakhs 0.5 Lakh
Electricity Cost (yearly) (Rs 6 per unit) 1.2 Lakhs 0.4 Lakh
Cost at purchase (tentative) 8 Lakhs 6 Lakhs
Cumulative Cost after 5 years 24 lakhs 12 Lakhs
Cumulative Cost after 20 years 70 Lakhs 30 Lakhs

Note : Standard Inflation rate and Depreciation of equipment has not been taken into account.
Cost of Civil work is not taken into account but can be deduced from the technical aspects Numbers are put in reference with a 100 KLD system.
* May vary from region to region
** The Performance evaluation of sewage treatment plants was published under NRCD by CPCB, August, 2013
***semi-skilled Labour (Rs. 7000 pm x 2 shifts); For DEWATS- unskilled (Rs. 4000 pm x 1 shift)

To see the list of projects completed, click here.