REDESIGN OF WATER RECYCLING SYSTEM IN ASTRA PROPERTY JAKARTA SELATAN AREA WITH OEE METHOD TO INCREASE CLEAN WATER EFFICIENCY IN SERVING INCREASED CONSUMERS

Water demand is increasing, but thus water resources are increasingly threatened due to the increasing use and pollution of the environment, therefore there is a need for long-term strategies regarding water use in order to maintain the sustainability of water resources in Indonesia, especially in the DKI region This study shows the effective steps in the efficient use of the water in the Astra South Jakarta property area, by reengineering the water recycling system, which uses the Overall Equipment Effectiveness (OEE) method. The results of this design have been able to increase engine effectiveness from 51.9% to 88.9% and water recycling productivity up 168% (production from 20m 20 to 54m3 per day), so that can reduce PDAM water supply 16.6% (water requirement before the system re design are an average of 4,088.2 m3 per month, after redesigning the system 3,407 m3 per month). The redesign of the system is also able to prepare water reserves that can supply water for the development of Astra properties in the area of around 20m per day. At DKI Profession level, the design of the reengineering can contribute to the DKI Jaya, the water supply of 0.00002% per day and can reduce the utilization of ground water because the water needs in Astra have been fulfilled.


Introduction
Water needs are increasingly increasing, but thus water resources are increasingly threatened due to the increasing use and pollution of the environment, therefore the need for long-term strategies on water use in order to maintain the sustainability of water resources in Indonesia, especially in the DKI Jakarta area. starting from the water use management system by processing domestic waste into water recycling in buildings in DKI, whose growth is increasing every year.
Building developments, especially in the DKI Jakarta area, are very rapid, judging from the first founding history of tall buildings in Indonesia starting from buildings in Jakarta, namely the Sarinah building in 1963 which has a height of 74 meters with a total of 15 floors. tall buildings in DKI reached 1,719 buildings consisting of the area of south Jakarta 571, central Jakarta 561, west Jakarta 302 and south Jakarta 141. Indonesian Forum Skyscrapercity Data in 2017 Jakarta has skyanchoring buildings up to number 7 in the world, with 362 buildings after Sanghai 366 building in a very rapid building development shows that the building management service industry is highly developed, therefore the development and optimization of building maintenance systems need to be improved in order to maintain water stability according to the mandate of Law No. 7 of 2004 concerning water resources, government regulation No. 121 In 2015 concerning water supply, the 2013 Republic of Indonesia Minister of Public Works 12 / PRTM / 2013 regulation on saving water use originating from providers of water supply systems. Although water facilities are guaranteed by the government, but to meet the needs of the industry, water needs have to cost not a little, but if the rules for use of ground water are not limited, they will preserve sustainability. environment and forestry that the quality of river water has been contaminated. While the fresh water supply contained in the earth is only 3℅ then 97℅ is sea water, while for the 2 / 3℅ of the fresh water it forms ice cubesahan therefore the need to pay attention to its use so that natural sustainability is guaranteed.
Based on Amrta Institute research, the need for clean water in DKI Jakarta is increasing every year. in 2015, clean water needs reached 1.2 billion cubic meters, an increase of one percent from the previous year. Of this amount, only 36 percent is met by the flow of PDAMs, the rest use ground water, it is estimated that the capital's water needs will increase by 25 thousand liters per second in the following year, to meet daily water needs, millions of people use ground and river water, plus groundwater exploration by buildings in urban areas such as DKI Jakarta which can potentially damage the environment considering excessive water withdrawal causes a decrease in the surface of the land every year, another thing if viewed from the health factor of water feasibility according to the Amrta Institute study, the institution who conducted groundwater and river research in DKI, 93 percent of river water and land in Jakarta were exposed to Escherichia col bacteria, reaching up to 2 million per 100 cubic millimeters of water, even though the tolerance limit of this bacteria was only 2,000 per 100 cubic millimeters, even if viewed from the level the potential for Indonesian water resources to keep up world number five for water resources, even though Indonesia is ranked 5 in the world of its water resources Indonesia will experience a water crisis, especially Jakarta, as predicted by researchers grouped in 10 cities in the world that it is threatened that the water in the table is as follows :  London Inggris wastage in the water hose for public areas up to 25℅ estimated that in 2025 there will be a water crisis 10 Tokyo Jepang Sumer water from rain water which is only 4 months duration every year if it rains less than four months it is predicted a water crisis (Source: World Research Institute (WRI) Http://www.granthaalayah.com ©International Journal of Research -GRANTHAALAYAH [4] The efforts of the provincial government in collaboration with the water supply company PDAM seeks to meet the needs of the people of the province of DKI by optimizing its production to bring in 97% of raw water from outside Jakarta, namely from Cisedani River, Jatiluhur Reservoir and also Cikokol River, while 3% from Jakarta is only in Jakarta. supply from Krukut and Pasanggrahan times, while 15 other rivers cannot be utilized due to pollution. Based on the review of the DKI Jakarta provincial statistical body (BPS) in 2017 the water production capacity in the province compared to the previous year has increased as shown in Figure 2 graphic of clean water production in DKI as follows:

Methodology
In this study, researchers analyzed the level of efficiency in the use of water and analyzed the water recycling system at the STP and then explained the causes of the water consumption being inefficient

Result and Discussion
The data processed in this study were processed using tools that fit the subject of the discussion, Overall Equipment Effectiveness (OEE). The OEE calculation is used to determine the total effectiveness of the machine used in water recycle (water recycle) that comes from domestic waste as a whole.

Analysis of Data and Research Results.
The company in anticipation of the surge in water demand and environmentally friendly strategies required for the Astra Group company through the AGC (Astra green company) concept, has carried out its sewage treatment process with the sewage treatment plan (STP) method, which is a biological system whose processes utilize decomposing bacteria that require oxygen and reprocessing STP out put into water recycle, with a carbon filtering system but even though it has managed waste to be processed as recycled into clean water the use of water from PAM is still lavishly complained, therefore it is necessary to identify the data as follows:

PDAM Water Supply Data
From the data of water consumption for 3 years counted the average water usage per day as in Table 2 are as follows:

Water Recycling Production Data
Water recycling production as follows:

Fishbone Diagram Analysis.
Fishbone diagram for system redesign as follows:

Water Recycling Production System Analysis
The recycled water production in the Astra Property area is felt to be less than optimal and unbalanced when compared to the investment in the equipment used, the alleged inadequate production is in accordance with the results of research and observations in the production system. Many supporting components are found that are not in accordance with the provisions. redesign the system so that production can be optimized.

Discussion
Based on the analysis using Fishbone diagram, OEE analysis of water consumption data and also direct observations, regarding water recycling which is less effective, steps are taken to repair and change the system with redesign so that recycled production can meet demand can also supply needs to property development required other steps as follows: 1) Change the installation of the blower pipe for air distribution from the blower to the diffuser from PVC pipe material to galpanis. From the results of observations and research air distribution from the machine blower to the diffuser is made of PVC material that does not have enough pans resistance, while the air that is channeled through the pipe comes from engine compression has a high temperature up to 90 ° C, the pipe made of PVC material wrinkles to the effect of disturbed air circulation. 2) Change the diffuser from an open system to a closed system. Open diffuser system will be at risk when the air does not flow because active sludge will enter the pipe and seal, it can cause blockage in the flow of the pipe so that bacteria will die and the waste will not be decomposed so the recycle will be disrupted even the waste quality standard will not be reached. 3) Change the design of waste circulation by adding a floating valve to the effluent pump to the supply water recycle tank. Http://www.granthaalayah.com ©International Journal of Research -GRANTHAALAYAH [8] 4) Floating valve is a control level of water in the tank, which works if the water is full it will close the valve automatically with mechanical movement, and if the water is empty the valve will open automatically because the pendulum will hang and move the valve to open automatically. 5) Replacing the check valve in the supply engine blower, two alternating blower units need a good check valve that is useful for anticipating air that leaks into the engine because if the check valve does not work properly there will be air leakage entering the engine that is not operating so the air supply to the defuser is not maximal.

Results Obtained After System Redesign
Improved water recycling treatment system results can be seen in the fall of Water utility bills and water usage due to water usage are subsidized by adequate water recycling as shown in Http://www.granthaalayah.com ©International Journal of Research -GRANTHAALAYAH [9]

Conclusions
The steps in optimizing the water efficiency system are to analyze and then redesign the machine productivity system and the processing system for recycling wastewater into clean water. The applied system is to improve the production process by changing the installation desing, such as piping from the original using PVC pipes then replaced with galpanis pipes, circulation of water initially with over flow without borders then change with over flow using ploating approach in use the function of the original spere part using a diffuser to supply air from the blower machine with an open system not using a membrane then changing it using a membrane. The efficiency obtained by astra as a consumer after the system redesign is an increase in production per day from the original 20.1 m³ to 54m³ or an increase of 168% so that it can increase water savings 33.9 m³ per day or save Rp 425,445, per day and increase business effectiveness overall machine from OEE calculations before 51.9% to 88.9% calculations up 71%. If the savings calculated by the total production of clean water in DKI Jaya in 2017 are 16,869 liters per second or 1,457,482 m³ per day, then the redesign of the water recycling system can contribute 0.00002%. of the total clean water production of DKI Jakarta Province.