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Water

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Along with the industrial development in Cilegon City, the demand for water, both in quantity and specific quality, has also increased. Therefore, on February 27, 2023, Chandra Asri Group purchased 49% shares of PT Krakatau Tirta Industri, making it part of the infrastructure entity under PT Chandra Daya Investasi (CDI).

 

PT Krakatau Tirta Industri has developed its business potential to meet market needs by building and operating several Demin Water Treatment Plants, Water Recycle Plant, Wastewater Treatment Plant with membrane, ultrafiltration, ion exchange, and biological treatment technologies . KTI's 3 business pillars include: Clean water, demin water, and wastewater treatment.

KTI's Business Pillars

Water supply services are the core business of KTI, which provides clean water to various industries, including Chandra Asri Group.

Raw Water Source
Raw Water Source

1. Cidanau River

Cidanau River is a vital river within the Cidanau Watershed (DAS), covering an area of 22,620 Ha. Cidanau River. This river plays  a crucial role in supporting the sustainable development in Banten Province. In addition to its significant water resources, the Cidanau watershed is home to an  endemic conservation area, Lake Swamp (Rawa Danau). Rawa Danau, which spans 3,500 Ha and is designated as a nature reserve. The Cidanau watershed has an average surface water discharge of 2,000 liters per second, further highlighting its importance to the regions’ water supply 

Raw Water Source

2. Cipasauran River

The Cipasauran Watershed is located ±48 km from Cilegon towards Labuan, covering an area of 41.52 km2. In accordance with the Water Use and/or Utilization Permit (SIPPA) number (No.570/4/SIPPA-DPMPTSP/II/2018), the maximum water discharge that can be processed is 800 liters/second.  

Raw Water Source

3. Nadra Krenceng Reservoir

Nadra Krenceng Reservoir serves as one of the raw water infrastructure, designed to store for use during the dry season or to meet the operational demands of the Krenceng water treatment plant. Nadra Krenceng Reservoir is located in Kebonsari Village, Citangkil District, Cilegon City, Banten Province. This artificial lake is fed primarly by the Cidanau River which is ± 28 km away, with water delivered via pipelines  . 

The Nadra Krenceng Reservoir is designed with the following specifications: 

  • Normal Water Level : +20.10 meters above sea level with an effective storage of 3,409,000 m3, 
  • Minimum Water Level : +17.5 meters above sea level with an effective storage of 731,000 m
  • High Water Level : +21.70 meters above sea level with an effective storage of 5,359,000 m3

The reservoir has received a Dam Operation Permit from the Ministry of Public Works and Public Housing with number PR.01.04-Mn/13 and was granted for a renewal for its operation feasibility number PR.02.04/KKB/333 in 2022.

Water Treatment Facilities
Water Treatment Facilities

1. Krenceng Water Treatment Plant (WTP)

Krenceng Water Treatment Plant was established in 1979 as one of the key water treatment facilities owned by PT Krakatau Steel (Persero) Tbk ( KS). In 1996, it was incorporated as a subsidiary of KS under the name PT Krakatau Tirta Industri (KTI). The plant has an installed capacity of 2,000 liters per second and operates using water sourced from Cidanau River. KTI manages the Cidanau weir and intake facilities located approximately 600 m downstream from the Cidanau River. The Cidanau weir, which spans 30 m,  is designed to raise the water level for diversion to the Sandtrap. This system has been optimized to a maximum flow discharge of 3,500 liters per second, which is then directed to Cidanau Pump station 1. The Pump station, which features  4 pump units with capacities ranging from 1,000-3,500 m3 / h, transmits water through  a 1.4-meter diameter transmission pipe over a distance of  ± 27.2 km to Krenceng water treatment plant.

The water treatment system at Krenceng IPA utilizes conventional technology consisting of coagulation, flocculation, sedimentation, filtration, neutralization and disinfection processes. The treatment begins with the addition of alum sulfate chemicals in the Distribution Chamber unit.  This is followed by the  floc formation and impurity settlement in the Accelerator unit.  The water then undergoes  filtration using silica sand media in the Green Leaf Filter unit. After filtration, lime is added for pH neutralization  and chlorine gas is used as disinfectant.  The treated  water meets the quality standards outlined in PERMENKES No. 2 Year 2023 standards.

Water Treatment Facilities

2. Cidanau Water Treatment Plant (IPA)

The Cidanau Water Treatment Plant (IPA) began operations in 2018, utilizing  raw water sourced from Cipasauran Dam. Raw water is pumped to the treatment unit located at Cidanau. The plant features 3 intake pump units, each  with a capacity of 400 liters/second each. The Cipasauran Dam, situated approximately  45 km from Cilegon towards Labuan, serves to raise the water level of the  Cipasauran river, allowing it to be directed to the  Cidanau IPA which is managed by KTI. Cipasauran weir, completed in 2017, spans 30 meters in width and stands 6.5 m tall. The IPA is equipped with an intake building, a flushing building, and a mud bag/sand trap channel, all located  on the right side of the weir.

The water treatment system at Cidanau IPA follows a similar process to  Krenceng IPA, utilizing conventional technology that includes coagulation, flocculation, sedimentation, filtration, neutralization and disinfection processes. The difference between Cidanau IPA and Krenceng IPA is in the Hexagonal Flocculator and Dynasand Filter units. The treatment process begins with the addition of alum sulfate chemicals in the Distribution Chamber unit, then the floc formation process in the Hexagonal Flocculator unit, then the deposition of impurities in the Lamella Clarifier unit and filtering using silica sand media in the Dynasand Filter unit. The processed ensures the production of clean water that meets the quality standards outlined in PERMENKES No. 2 Year 2023 standards.

Distribution Lines
Distribution Lines

Pipeline Line

Clean water produced by PT Krakatau Tirta Industri is distributed to customers through pipelines with a total network of more than 100 km. The distribution line is divided into:

  • Western Region
    PT KS Production Unit, PT KS & Group, Pelindo Cigading, IP UBP Suralaya, Krakatau Industrial Estate, PT Asahimas Chemical, PT Chandra Asri Pacific Tbk, PT Dongjin Indonesia, PT Lautan Otsuka Chemical, PT Indorama Petrochemical, PT Permata Dunia Sukses Utama, PT Jawamanis Rafinasi, PT Sentra Usahatama Jaya, and others.
  • Eastern Region
    PT Krakatau Baja Konstruksi, Krakatau Medika Hospital, The Royale Krakatau Hotel, Krakatau Country Club, PT Krakatau Steel Office, PDAM Cilegon Mandiri, and others.
Distribution Lines

2. Pump House

To meet the needs of the Western and Eastern Regions, there are several pump houses (PS/Pump Station) that operate to distribute clean water, among others:

  • Pump House III
    There are 5 horizontal centrifugal pumps, 3 pumps are used to drain water to the tower with a water discharge capacity of 900 m3 / hour, while 2 pumps are used to drain water to PS V (SEPS) with a capacity of 1,080 m3 / hour.
  • Pump House IV 
    There are 7 vertical centrifugal pump units with a capacity of 900 m3 / hour, to distribute water to PT Krakatau Steel, KIEC 1 Area, Krakatau Posco (KP), PT Krakatau Chandra Energi (KCE), PT Lotte Chemical Indonesia (LCI) and the rest for the Cigading area.
  • Pump House V 
    There are 3 horizontal centrifugal pump units with a capacity of 252 m3 / hour and 2 pump units with a capacity of 504 m3 / hour which pump clean water from the 5,000 m3 Reservoir to the Krakatau Baja Konstruksi (KBK) Area, Krakatau Medika Hospital (RSKM), and KS Housing.
  • Pump House VI 
    There are 5 pump units with a capacity of 900 m3/hour, to distribute water to consumers in the Cigading-Ciwandan area and KIEC Area 2.
  • Pump House VIII WTP Cidanau
    There are 4 pump units with a water discharge capacity of 210 Liters/second to distribute water to consumers in the Ciwandan area.