Waste reduction potential in samtama program implementation (study case: rt 10/rw 03

. Waste is one of the big problems often faced by metropolitan cities like DKI Jakarta. The Jakarta Environment Agency's research stated that DKI Jakarta produces 7500-tons of waste per day with 60.5% coming from residential. Therefore, the DKI Jakarta government initiated the Sampah Tanggung Jawab Bersama (SAMTAMA) to mobilize residential people to manage waste from its source at certain locations as a pilot, one of locations is RT 10 / RW 03 Cempaka Putih Timur. RT 10 / RW 03 Cempaka Putih Timur is the RT that is considered optimal in implement the SAMTAMA program. Based on this, the objectives of this study are to find the existing condition of SAMTAMA program and to measure the waste generation, composition, and reduction potential in the implementation of SAMTAMA program. The method implemented in measuring using SNI 19-3964-1994 which is carried out for 8 consecutive days. Waste composition is classified based on SNI 19-3964-1995, supplemented with components of B3 waste and diapers. The results of the analysis show that the average of waste generation is 14.99 kg/day where the treated waste is 11.36 kg/day and the untreated or residual waste is 3.63 kg/day with the largest composition is food waste with 10.66 kg/day (71%). With SAMTAMA Program implementation, the waste potential reduction can reach 0.019 kg/day/person.


Introduction
Waste management in metropolitan cities faces many problems because the amount of waste is getting bigger [1].In addition, this also occurs because waste management still uses the old paradigm that relies on collection, transportation, and disposal activities.According to DLH DKI Jakarta, If there is no suitable system for waste management, it will require a lot of budget from time to time and more landfill location.DKI Jakarta is a city with a dense population.According to Attachment to the Decree of the Head of the Sanitation Office No. 334 2013, DKI Jakarta produce organic waste in the biggest number as many as 53.75% in their research in 2011 like Figure 1 below.Beside of that, according to DKI Jakarta Environment Agency in Official Portal of Integrated Waste Management Unit, Jakarta produces 7452.6 tons of waste per person where 60.5% from domestic waste in 2018 [2].If it still using the old paradigm, TPST Bantargebang which is a DKI Jakarta waste shelter is threatened to be unable to dispose of waste again in 2022 [3].
The waste management paradigm that relies on the final approach should be abandoned and replaced with a new paradigm of waste management.To change this paradigm, the DKI Jakarta government has created a household waste management program called the Sampah Tanggung Jawab Bersama (SAMTAMA) where waste management is carried out from its source so that all parties have an awareness to the waste.
SAMTAMA is a movement / social branding of waste management to reduce the waste by changing the mindset of people about waste.To run the SAMTAMA Program, the government give some socializations to representatives of each RW in DKI Jakarta about increasing the awareness to the waste by bring them to TPST Bantargebang.Beside of that, the government teaches them how to do 3R (Reduce, Reuse, and Recycle) to the waste so that they have skills to manage their waste well.In addition, the government still in progress to make the regulation about SAMTAMA Program so that the program could be sustain.

Determination of Research Location
The determination of the location is based on direct observation and the ease of information access about the condition of the location.The research location is RT Therefore, 10 houses that were considered optimal and consistent in carrying out the SAMTAMA program were taken as the sample of this study to determine the waste generation, waste composition, and waste reduction potential.

Environmental Aspects Data Collection
This research requires an appropriate and accurate method to obtain representative data.The data needed in this research are primary data and secondary data.
Primary data can be obtained from research and direct observation of the field.In this research, the measurement that has conducted are Waste generation, Waste composition, and reduction potential in RT 10/RW 03 Cempaka Putih Timur.
Secondary data is needed to support primary data.Secondary data were obtained from government agencies namely DLH DKI Jakarta, RW, and RT.
Secondary data needed in this study are: a. Total population of RT 10 / RW 03 Cempaka Putih Timur.
b.Total treated waste of composter barrels, maggot BSF, and waste banks.

Waste Generation
Waste generation is the amount of waste that generates from the people.Since SAMTAMA management program had been implemented, to calculate the waste generation, the amount of residual waste and treated waste must be added up.
Residual waste is waste from the people that is not treated by SAMTAMA program, while treated waste is waste from the people that is treated by SAMTAMA program.
The method of sampling the residual waste generation is done by collecting residual waste from 10 housing units used as samples and weighing every day for 8 days based on SNI 19-3964-1994.The collection process is carried out by taking out waste from sources that have been contained.
After that, the residual waste that has been collected is weighed to calculate the total weight of the residual waste produced each day so that the resulting waste generation is expressed in kg/day.The equipment needed is a hanging scale with a scale of ± 100 kg, a waste measuring tub with dimensions of 20 cm x 20 cm x 100 cm with a weight of 5 kg, and a measurement form.
Then the amount of treated waste obtained from data that has been recorded by head of RT 10 Cempaka Putih Timur.
To determine the waste generation, this research using Equation 1 [4].

Waste Generation = Average of residue waste + Average Treated Waste
(1)

Waste Composition
The method used in accordance with SNI 19-3964-1994 [5].Waste is taken to the measurement location provided and then separated according to its composition.
Plastic bags are needed to store sorted waste before weighing.To weighing the waste, it needs a hanging scale with a scale of ± 100 kg and measurement form.The residue waste composition has classified based on SNI 19-3964-1995 [6], namely: food waste, wood and foliage, paper, textile, rubber, plastic, metal, and glass.However, in its implementation usually has 9 and 10 components namely hazardous waste and diapers [7].
The calculation of the composition of urban waste can be seen in the Equation 2as follows.

Reduction Potential
To determine the percentage of reduction potential and reduction potential per person of waste in this program, the research using this Equation 3 [8]  Then for residual waste that cannot be treated will be transported by the transporter using a cart every 03.00 WIB or 09.00 WIB to be taken to a temporary disposal site.

Waste Generation
Waste generation generated by each house generally has a different amount.This caused by the number of waste components produced by each house can be different and the number of occupants of each house can be different [9].The number of waste generation can be different also because of the consumption patterns of the people followed by changes in people's lifestyles [10]. By

Waste Composition
Not only the generation of waste that can differ in the amount from each source, but the composition of waste is also the same [11].If there is no SAMTAMA Program, the waste composition of 10 houses of RT 10/RW 03 Cempaka Putih Timur can be found as a graph in Figure 4 in blue bar.After they implement the SAMTAMA Program, the residual waste composition will be seen as Figure 4 in red bar below by using SNI 19-3964-1994.From the measurement results, it can be seen that the composition of the largest waste generated by these 10 houses is food waste.This number can show the kind of people's life patterns are sampled because the simpler lifestyle of the people, more organic waste can be produced [7].According to comparation of waste reduction based on waste composition in RT 10/RW 03 Cempaka Putih Timur, the SAMTAMA program able to reduce food waste until 89%, plastic waste until 56%, and glass waste until 80%.The comparation can be seen in this Table 3.The waste reduction rate can be found by using Equation 3. Table 4 shows the rate of reduction rate resulted.The percentage means the reduction potential of SAMTAMA program implementation by using equation 4 with the total number of residents is 38 people will be reduced 0.019 kg/person/day of waste to TPST Bantargebang.If it is projected to RT 10, RW 03, and DKI Jakarta levels, the waste reduction potential to TPST Bantargebang can be seen in Table 5.Besides that, because the research assumes the all people have the same number of reduction potential.
Not only DKI Jakarta that has household-waste waste management, Surabaya that have population as 2,874,699 people in 2017 according BPS Jawa Timur also.
The facilities of waste management that provided in Surabaya are composter, recycling, and waste bank [12].In 2017, the data show that Surabaya able to reduce their waste with the management into 16.81% [12].If the waste reduction potential of SAMTAMA program compared to Surabaya waste management, SAMTAMA program should reduce the waste until 61.39 %.

Conclusions
The -The potential reduction of the waste management is 0.019 kg/day/person.

Fig 1 .
Fig 1. Waste Composition of DKI Jakarta Based on Attachment to the Decree of the Head of the Sanitation Office No. 334 of 2013

3. 4
Reduction Potential SAMTAMA program was implemented to reduce the waste generation in temporary waste disposal.Waste management facilities provided by RT 10 / RW 03 Cempaka Putih Timur in running the SAMTAMA program to reduce waste generations are waste bank, composter barrels, and maggot BSF.Waste bank is for treating plastic bottles and glass bottles.Meanwhile composter barrels and maggot BSF are for treating organic waste in the form of foliage and food waste.
10 / RW 03 Cempaka Putih Timur, Jakarta Pusat, where the RT 10 location has 70 housing units with a population of 218 people.

Table 1 .Table 1 .
The Rate of Residual Waste Generation of 10 Houses of RT 10/RW 03 Cempaka Putih Timur.
using the SNI 19-3964-1994 method, the rate of residual waste generation of 10 houses with 38 residents in RT 10 / RW 03 Cempaka Putih Timur measured for 8 consecutive days after implement the SAMTAMA Program obtained results as 31st -November 7th 2019), the data of treated waste can be seen in Table2.However, due to the waste bank data recorded once a month from head of RT 10 Cempaka Putih Timur document.To get the number in kg/day in the waste bank http://dx.doi.org/10.33021/jenv.v5i2.1276|8canbe found by the number of bottle plastic waste deposits in a month divided by the number of days in a month.The waste bank data used in Table2is October 2019 data.

Table 2 .
Waste Reduction by SAMTAMA Program Implementation

Table 4 .
Waste Reduction Rate of SAMTAMA Program

Table 5 .
Waste Reduction Potential of Each Level Bantargebang is 4508.823tons/day.Based on that total, waste reduction rate of SAMTAMA program only 4.42%.But there is a gap for this case because of the different of waste generation number between 38 people and 10,500,000 people.http://dx.doi.org/10.33021/jenv.v5i2.1276|12 existing waste management condition of SAMTAMA program in RT 10/ RW 03 Cempaka Putih Timur is having 1 waste bank, 6 composter barrels, maggot BSF cultivation that is active to reduce plastic bottle, glass bottles, and organic waste.Beside of that, they have an organizational structure in RW level consisting of supervisors, main coordinators, companion, composter coordinator, waste bank coordinators, person in charge in composter, person in charge in waste sorting, waste recording, and waste transportation.