• Quantity of oil and lubricant-polluted wastewater: 2,500 m³/year
• Oil content 3–5 %

Your pay-back time:

OUTSIDE DISPOSAL

• Quantity of coolant and lubricant-polluted wastewater: 2,500 m³/year
• Oil content 3–5 %
• Pick-up frequency 100 times/year

• 1 receiving vessel with a capacity of approx. 50 m³ for the used coolants and lubricants to ensure uninterrupted production
• Coolant and lubricant pump for introduction and pump-off.

Industrial wastewaters as picked up by disposal contractors are normally not concentrated. As a result, no substances are recovered from them nor are the wastewaters reduced in volume. This means that an intermediate storage volume (including safety factors) of 50 m³ must be available to receive the wastewater.

Therefore the disposal costs for 2,500 m³ at a rate of 120 €/m³ amount to 300,000 €

LOFT Evaporator

• Quantity of coolant and lubricant-polluted wastewater: 2,500 m³/year
• Composition: oil content 3–5 %, here 4.8 % = 120 m³ oil and 2380 m³ water
• Concentration to 60 % oil content = 120 m³ and
• 40 % water content = 80 m³, providing a total volume of residual concentrate of 200 m³ .

• Destimat® LE 400 with a wastewater throughput capacity of 400 l/h
• Two 15 m³ receiving vessels, one for the coolants/lubricants and one for the distillate
• An coalescence oil separator located upstream of the distillate vessel for post-cleaning of the distillate with a siphoning station and a pump
• Distillate pump for return to production loop or – alternatively – discharge into the municipal sewer system

Concentrated evaporator effluents effect cost savings due to the valuable raw materials they contain. The cost reduction for disposal of the residual concentrate is calculated as follows:

120 €/m³ basic disposal costs

- 50 €/m³ credit for raw material recycling

= 70 €/m³ disposal costs per cubic metre

When concentrating to 60 % oil content and 40 % water content and therefore a residual concentrate volume of 8 % (= 200 m³) relative to the original wastewater volume, the resultant disposal costs are

200 m³ × 70 €/m³ =                                                                                          14,000 €

Providing you annual cost savings of                                                                               286,000 €

WATER COSTS

Distillates - practically regardless of their composition - cannot be reused as process liquids and must be disposed of. Taking as an example 2,500 m³ of coolant and lubricant-polluted wastewater with a pollutant content of 4.8 %, disposal causes a fresh water wastage of 2,380 m³.

Assuming a water price of 4 €/m³, this amounts to water replenishment costs of 9,520 €

Due to the substantial thickening of the wastewater, the recycling of the distillate vapours, water usage is reduced to a fraction.

The distillate can be reused completely if required, therefore the only water loss is the residual water content of the concentrate (approx. 40 %).

For an annual concentrate volume of 200 m³, this would be only 80 m³/year.

Assuming a water price of 4 €/m³, this amounts to costs of 320 €

Your annual cost savings now amount to                                                                         295,200 €

HANDLING COSTS

Each pick-up of wastewater by the disposal contractor must be coordinated by one of your employees. We estimate the work time required at approx. 1 hour per pick up. Assuming a wastewater generation of 2,500 m³ per year and a pick-up frequency of 100 times per year, this translates to an annual time spent f 100 h à 40 €/h.

Factoring in the additional ordering and administrative time of approx. 10 h à 40 €/h, this costs 4,400 €

The maintenance work conducted on a weekly and monthly basis for a LOFT evaporator amounts to approx. 98 hours a year. Assuming an hourly salary rate of 40 €/h, this costs 3,920 €

Your annual cost savings now amount to                                                                        295,680 €

ENERGY COSTS

Thickening of industrial wastewaters with LOFT evaporators of course generates energy costs. For the wastewater and example described, the consumption amounts to

2,500 m³/year and 70 kwh/m³ = approx. 175,000 kWh/year, translating at a power cost of
0,10 €/kWh to 17.500 €

MAINTENANCE AND REPLACEMENT PARTS

The costs of maintenance and replacement parts of LOFT evaporators can be reliably estimated at 2 – 4 % of the purchase price. The investment price for this example would be approx. € 150,000, 4 % of which is                                                                                           6,000 €.

Your annual cost savings now amount to                                                                         272,180 €

CONSUMABLE MATERIALS

Disposal

No consumable materials are used up when disposal is provided by an outside contractor.

LOFT Evaporator

Weekly cleaning of the unit (1 × double flushout / week) costs 1,100 € p.a. for the cleaning agent, acid and base, 600 € p.a. defoaming agent and compressor oil change at 1300 € every 750 operating hours, translating to annual costs of                                                    3,000 €

Your annual cost savings now amount to                                                                         269,320 €