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Reducing Water Usage and Effluent

In order to help realize a recycling-oriented society, the Lintec Group is working to reduce waste. It is also striving to save water, reuse waste water, while complying with the effluent control regulations and improving the quality of effluent generated.

Reducing Water Usage and Effluent

In fiscal 2018, Lintec used 8,484,000 m3 of water. Of this amount, about 89% was used by the Kumagaya and Mishima plants, which are Lintec's Fine & Paper Products Operations. Water usage per unit of paper production was 47.2 m3/t*5. Lintec was unable to achieve the target of a 1.0% reduction on a year-on-year basis.
The target in fiscal 2019 is 1.0% reduction per unit of production from the previous year. To that end, the plants will make continued efforts to reduce water usage in each process and prevent water leaks.

  • *m3/t: While t/t was used for calculation, the measurement was converted to m3p> for this report.
Process from Water Intake to Effluent

Water usage data is calculated by source.

Category FY2018 (thousand tons)
Total water usage 8,384
Tap water 523
Industrial water 4,133
Groundwater 3,828
Effluent 6,975

Standards, methods and preconditions used

Measurement value is used for tap water, industrial water and groundwater.

Process from Water Intake to Effluent
Water usage (Kumagaya and Mishima Plants)
Water usage (Kumagaya and Mishima Plants)
Effluent treated (Kumagaya and Mishima plants)*
Effluent treated (Kumagaya and Mishima plants)
  • *Total of flowmeter data for effluent treatment equipment installed at the Kumagaya and Mishima plants.

Reducing Effluent

Effluent processing equipment at the Kumagaya Plant

Effluent processing equipment at the Kumagaya Plant

The total amount of water used by Lintec in fiscal 2018 was 8,484 thousand m3. About 89 percent of this was used at the Kumagaya and Mishima plants. These plants are working to reduce their water usage and effluent discharge by taking measures such as reusing used water in each papermaking process. They will continue to renovate the water treatment facilities.

Effluent Water Quality (Fiscal 2018)
Kumagaya Plant
Item Wastewater standards Results
Maximum value Average value
pH 5.8~8.6 6.68~7.52 7.08
Regulations on emission concentration SS*1(mg/ℓ) 60(50) or less 31.0 11.65
BOD*2(mg/ℓ) 20 or less 27.0 9.25
COD*3(mg/ℓ) - 41.8 21.66
Regulations on total emissions COD(t/day) 0.858 or less 0.264 0.128
Nitrogen(t/day) 0.4068 or less 0.168 0.0228
Phosphorous(t/day) 0.0418 or less 0.0039 0.0008
  • Note: A BOD value exceeding the plant's voluntary standard (a value agreed upon with Kumagaya City) of 20 mg/L was recorded. We reported the fact to Kumagaya City immediately, and took appropriate action. The BOD treatment facility will be improved in fiscal 2019.
Mishima Plant
Item Wastewater standards Results
Maximum value Average value
pH 5.8~8.6 5.9~7.2 6.54
Regulations on emission concentration SS*1(mg/ℓ) 80(60) or less 29 3
COD*3(mg/ℓ) 90(65) or less 83 22
Regulations on total emissions COD(t/day) 0.9431 or less 0.4896 0.2362
Nitrogen(t/day) 0.3961 or less 0.1850 0.0451
Phosphorous(t/day) 0.0405 or less 0.0048 0.0010
  • Notes: 1. Figures in parentheses are the daily average values. The regulations for each plant are as follows:
    Kumagaya Plant: The regulation value shown for BOD is based on a value agreed upon with the city of Kumagaya. The values shown for pH, SS, COD (total emission), nitrogen, and phosphorus are based on the environmental protection ordinances and notices of Saitama Prefecture.
    Mishima Plant: The regulation values shown for pH, SS, and COD (emission concentration) are based on the Water Pollution Control Law, while the values for COD (total emissions), nitrogen, and phosphorus are based on notices from Ehime Prefecture.
    2. In the column showing the maximum values of the results, the minimum to maximum values are shown for pH and the total value is shown for regulations on total emissions.
  • *1 SS (suspended solid): substances that remain in suspension in water and cause water turbidity.
  • *2 BOD (biochemical oxygen demand): amount of oxygen consumed when microorganisms break down organic matter in the water.
  • *3 COD (chemical oxygen demand): amount of oxygen required to oxidize oxidizable substances in water.
Masashige Aoki

Masashige Aoki
Senior Project Manager, Assistant to Plant Manager
Kumagaya Plant

Recovering and Reusing White Water to Reduce Water Usage

The Kumagaya Plant consumes a large amount of water to run two paper machines, and works to reduce water usage. Our efforts include reuse of white water, which refers to water mixed with raw materials in the papermaking process, mainly for material preparation and dilution as well as equipment and other cleaning. We also promote water-saving measures, specifically, the reuse of cooling water in each process. We will encourage cross-divisional efforts to save and reuse water, aiming to further reduce water usage.