Utilization of Information Technology for Non Domestic Waste Management in Semarang City

Garbage problem is often very complex in urban areas. The handling pattern of collecting, transporting and disposing that has been applied up to this day has not yet produced an appropriate solution. This is evident from the data of statistic centre institution in 2015 that 76.31% of the existing waste in the community has not been sorted, while 10.28% sorted to be used and 13.41% sorted to be discarded, showing the community amount of unsorted garbage large enough to necessitate managerial efforts at the waste sources. In designing a systematic and structured waste management system, the generations, compositions, and characteristics of the waste are indispensable. Therefore, a research is conducted on these three dimensions to the non-domestic waste in Semarang City, which involves commercial waste (from the markets, restaurants, and hotels), institutional waste (from the offices and schools ).From the research result the average of 0,24kgs/person/day in weight unit of the City’s nondomestical waste generation is derived. The waste composition is dominated by organic waste of around 61.95%, while the rest percentage is inorganic. The management policy is directed with the application of Management Information System model based on Information Technology because of the system’s abilities to effectuate the waste management.


Introduction
An increase in a population will increase the amount of the waste generations.Factors causing waste generations such as lifestyle changes and the increasing varieties of consumption patterns in the community increase the volume of waste [1].The problem of garbage in urban areas is often a very complex problem, in the manner that it requires a systematic and structured handling mechanism.The program of management at its sources which has been applied in Indonesia has not yet made a successful solution.The evidence from the Central of Statistics (BPS) data in 2015 showed that 76.31% of the existing waste in the community has not been sorted for disposal, 10.28% is sorted to be used and 13.41% is sorted to be discarded [2].
Based on its sources, garbage can be broadly grouped into domestic and non-domestic waste.The domestic waste is the waste generated from household activities or environments whereas the non-domestic waste is the waste derived commercially, industrially, or institutionally from the buildings' waste, municipal service waste, mud of sewage treatment plants and other remnants, and agricultural waste [3].Waste that is not managed properly will cause various problems such as dirtiness, odor, disease vectors, and groundwater contamination.As a preventive measurement, it is necessary to design a waste management system.
The weaknesses in the current waste management can not be separated from the improper handlings of waste planning, implementation and supervision.One of the causes of this weakness is that the garbage management system has not been able to provide accurate information starting from handling waste at its sources, temporary shelters, and eventual final processing sites.The condition will pose difficulties to the authorities who handle the waste in formulating the policy.
The city of Semarang is currently experiencing a very rapid development, marked among others by more and more standing hotels and shopping centers as well as other infrastructural developments.Referring to Semarang's data in number of 2014, by then Semarang City already had 10 department stores, 52 supermarkets, and 47 traditional markets.The city of Semarang also had 48 hotels, 1616 schools and 126 offices.A development of a city must certainly bring benefits to the community, but behind it there also lie impacts, and one of the most visible is garbage coming from these nondomestic sources.
The method of determining and setting the number of samples of generations and compositions of cities waste in Indonesia has been arranged based on SNI-19-3964-1994.According to the SNI method, the determination of waste generations and compositions in the city is carried out on all sources of waste, namely domestic and nondomestic, which include commercial, institutional, municipal services (from road sweeping) and industrial waste.By knowing the generations, compositions and characteristics of waste, especially those from more representative sources, problems in waste management can be prevented and anticipated as early as possible.These data can also be used to design waste management (especially at source) and appropriate waste processing technology, so that final waste disposal to the landfill can be reduced, in accordance with the patterns the developed countries have been applying in the recent years.
This research will start from a survey to collect the data of non-domestic waste generations followed with a study to the mechanism of the waste handling system that has been applied by the city government, investigation to the weaknesses of the existing system, and consequent formulation of a proper policy direction for the waste management.

Research methods
The stage in this research includes literature studies, secondary data collections and primary field analysis, as well as data processing.Secondary data collection is available from the existing garbage data, garbage infrastructure and supporting facilities of Semarang City from BPS of Semarang city, as well as the garbage management of Semarang City Sanitation and Gardening Department, and identification of a number of facilities that produce non domestic waste.
This research is descriptive quantitative in nature, using the data from field observation and inputs from some reliable sources.Given the research basis of focusing on an object, the data collection methods therefore will be executed more with selected key informants.[4] Primary data collection is accomplished with observation and non-domestic waste sampling.Observations made during field research are useful as additional information to support primary data in the field.Field research in the form of garbage sampling from each source of non-domestic waste to obtain data of waste generations in both weight and volume units, the compositions of the waste based on the types of the organic waste (food waste, paper, plastics, textile, rubber, yard waste, wood) and the inorganic (glass, cans, metals, etc.), compaction factors, and the specific weights of the non-domestic waste.The samplings and their measurements are based on the method SNI-19-3964-1994.Obtained from SNI calculation are 43 nondomestic garbage samples, which can be grouped into 8 categories of sources including 7 markets, 2 shops (grocery and photocopy shops), 5 restaurants, 5 hotels, 6 offices, 10 schools (kindergartens, elementary, junior, and senior high schools, as well as universities), 2 hospitals, 3 roads and 3 industries.

Existing condition of non-domestic waste management in Semarang city
Handlings of the non-domestically sourced garbage, including sweeping or cleaning service in the market environments up to temporary shelters, are the responsibility of the Trade Service Office (as the market management).Waste from the TPS (temporary shelters) is transported and disposed of to the landfills (TPA/final disposal) by using trucks from the Sanitation Service.SubDistrict offices nearby markets also have temporary shelters.
The handlings of the garbage along the protocol roads, especially sweeping and collecting are carried out by the KSM (Society's Self-Help Groups) coordinated by the Head of Villages.The garbage collected along the protocol roads is then transported by the Third / Private Parties using trucks and directly disposed of to the Final Disposal.The garbage on the roads that are not cooperated with private parties are then transported by the Subdistrict's.
Semarang City Government has tried to overcome the waste.The government has optimized all existing facilities and infrastructure, making local regulations on waste.The government has also established cooperation with third parties (industrial parties) in waste processing.However, these efforts still can not handle the waste problem optimally.There is still a large amount of waste that has not been handled.

Non-domestic waste generations
The determination of non-domestic waste generations has considered factors of correction, compaction and recycling.The determination of waste generations is expressed in the units of weight (kgs) and volume (liters).From the primary data processing, the average of nondomestic waste generation in Semarang is 0.24 kg / person / day in weight unit.The biggest contributing source of waste came from hospitals waste (0.49 kg/ p / d), followed by markets waste (0.42 kg / p / d).Table 1 shows the non-domestic waste generation in Semarang in kg / person / day.

Non-domestic garbage generation per day
Based on SNI-19-3964-1994 the field research was conducted eight days in a row, and from the research the non-domestic waste generation per day is obtained.Figure 3 shows the daily, non-domestic waste generation in Semarang City for each source's category.
-0,500  The most generation of commercial waste occurs on Sundays because they are holidays, in average of about 4.6% of the total generations.In the meantime, the institutional waste generations of Semarang City increased on working days, reaching 1.2% of the total generations with a declining tendency at weekends due to the decrease of working activities during holidays.
The average of the hotel-waste generations also takes increases on Sundays because not only that they are holidays but the roads facilities in front of the hotels are also used by the non inhabitants who visit Semarang City in addition to the local passers by, which produce of 0,169% of the total waste generations.In the picture above it is seen that the generation of industrial waste is almost constant due to the daily operations of productions, which is an average of 0.02% of the total existing waste generations.

composition of non-domestic waste generations
Waste composition is the ratio of the wet weight of a component or a type of waste to the whole waste.The result of research on the composition of the nondomestic waste in Semarang City shows that the most waste is the organic with 62% in percentage consisting of food and leaf waste, whereas the inorganic consists of 12.26% paper, 1,727% glass, 13,39% plastics and 1.8% metals, as well as 1.55% textile, 0.50% rubber, and 6.8% other waste.The composition of non-domestic waste in Semarang City can be seen in more detail in Figure 5.

Fig 2. Composition Of Non-Domestical Waste
Generations In Semarang City

policy direction of non-domestic waste management through the utilization of information technology
Technology is created by men to simplify natural processing, activities, and everything that is bound to human needs.Technology is a way and an effort to improve quality of human life and to welfare it (budget funds 2013).Utilization of technology has become an important part in environmental management.Not only that technology become a tool to fulfill people's needs, but it also maintains and preserves the quality of the environment.Technology also serves to manage it, in order to remain compatible and hormonius with human life.Technological advancements have brought about shifts in human behaviors in their daily activities.Many of the human activities utilize technology either mechanically to electronically.Recently the condition of the waste is still mixed between the organic and the anorganic.
3. The mixed waste should be sorted out ( of which sorting can be done by the markets' sellers).
4. Technically the selection can use containers or garbage bags according to the type of garbage.
5. The market cleaning service will take the garbages to process when the marketing activities are over.The anorganic waste is purchased by the manager according to the weight and type of waste.

PROCESS : WASTE MANAGEMENT
1.The sorting results of inorganic waste such as paper, plastic, glass bottles are collected for sale to recycling agents.
2. The result of organic waste such as leaves or vegetable leftover will be processed into compost fertilizer in accordance with the capacity of the waste disposal machine.

Information Technology utilizations include:
-Purchase of anorganic waste through online applications equipped with the garbage prices, volume and location for easy retrieval -Promotion and networking for organic fertilizer users through online media to market fertilizer from organic waste products.
-Garbage collected is recorded using database program and is accessible to the Sanitation Department.

OUTPUT: WASTE MANAGEMENT MODEL
1. Information on the amount of waste generation and waste, both organic and anorganic, management result will be automatically received by the Sanitation Service.
2. Transport time will be efficient.The containers in the Temporary Shelters are not expected to be full fast so that the transportation period can be arranged and mapped to make the garbage dumping in Semarang City more effective and efficient.
3. Waste can be managed at the sources so that the burden of accumulation on the Final Disposal Sites is expected to decrease.

4.
Anorganic waste has been disaggregated at the source to make less of waste with difficult materials to decompose at the Final Disposals, thus sustainable LandFill managements are expectable.

The non-domestic waste generation of Semarang
City is an average of 0.24 kg / person / day in weight unit.The largest contributing source of this waste comes from the hospital waste (0.49 kg / p / d), followed by the market waste (0.42 kg / p / d).
2. The daily generation of the non-domestic waste occurs mostly in the commercial areas, which is of 4.9% of the total waste generations on Sundays.

Non-domestic waste composition of Semarang City
shows that the most waste is organic garbage with 62% percentage consisting of food waste and leaves.The rest of 38% is inorganic waste in the form of paper, plastic and so on.

Information System Management model based on
Information Technology can simplify and streamline waste management.This is in the manner that the output system can generate information about the state of waste and handling mechanism based on certain criteria without having to do repetitive data processing.

A system model based on information technology
can avoid data inconsistencies and can reduce files and time of recording garbage handling.

Suggestion
The implementation of the waste management policy direction can be an early model to be tested in Semarang City for further research that can be developed at the national level.

Fig 1 .
Fig 1. Non-Domestic, Daily Waste Generations Of Semarang City

Fig 3 .
Fig 3. Exsisting of Non Domestic waste managent in Semarang City

Fig 4 . 1 .
Fig 4. Plan of non domestic waste management with utilisation information technology in Semarang City

Fig. 5
Fig.5 Input and output Waste management With Utilitazion information technology

Table 1 .
Non-Domestic Waste Generations Of Semarang City