Characteristics and Generation of Household Hazardous Waste ( HHW ) in Semarang City Indonesia

Most of Household Hazardous Waste (HHW) is currently mixed with domestics waste. So that, it can impact human health and environmental quality. One important aspect in the management strategy is to determine the quantity generated and characteristics of HHW. The method used to determine the characteristics HHW refers to SNI 19-2454-2002, while the HHW generation refers to the SNI 19-36941994 calculated based on weight and volume. Research was conducted in four districts of Semarang. The samples used in this study were 400 families calculated based on the proportion of Slovin Formula. The characteristic of HHW in Semarang City is mainly infectious (79%), then poisonous (13%), combustible (6%) and corrosive materials (2%). The quantity HHW generated is 0.01 kg/person/day equivalent with 5.1% of municipal solid waste (MSW) in Semarang (linear equations : y=1,278x+82,00 (volume), y=0,216x+13,89 (weight).


Introduction
Generally, the people in the city (85,3%) mix all components of household waste, included HHW.Many people do not know that household activities can produce dangerous waste and endanger health and surrounding environment [1][2].Although the existence household hazardous waste in the waste appearance from city people is relatively small, but with the increasing population, the amount of waste generated will also increase.
The impact of HHW is accumulated in the water and soil is an annual.For example, research conducted by Tuthill et al [3] and Ololade et al [4] the sample shows result containing Pb, Ni, Cd and also the increase of physic parameter concentration and chemical such as pH, turbidity, conductivity and phosphate [3][4].Considering the potential of the impact of HHW, it would require proper management.One aspect that is important as a first step draw up guidelines and HHW management strategy is to determine the characteristics and HHW generation.

Research sites
The study was conducted in the Semarang City (Indonesia), Semarang lies between 6°50' -7°10' of south latitude and line 109°35 -110°50' of east longitude.The west border is Kendal Regency, the east border is Demak Regency, the south border is Semarang Regency, and the north is Java Ocean with the length of 13,6 Km.

The sample of the research
The number of minimum sample measurement for Semarang City was 400 family, divided into 109 family in Pedurungan Sub-District (high economic level), 129 family for West Semarang Sub-District (medium economic level), 77 family for North Semarang Sub-District (low economic level), and 85 family for Banyumanik Sub-District (topography of high land zone) [5][6][7].The measurement of generation HHW refers to SNI 19-3694-1994 (National Standard of Indonesia).The characteristic or composition of HTHW identification was based on SNI 19-2454-2002 attachment.

HHW generation
HHW generation is based on Indonesian National Standard (SNI 19-3694-1994) and was conducted for 32 consecutive days for four districts in the Semarang City.

HHW characteristics
Sampling was done by the separation of organic waste and HHW.After the separation, followed by

HHW characteristics
Characteristic of HHW in Semarang was divided into 4 types: corrosive, combustible, poisonous and infectious.Sampling results to identify the characteristics of HHW in Semarang city indicate that HHW generation: corrosive (0.0002 kg/person/day), combustible (0.0006 kg/person/day), poisonous (0.0018 kg/person/day) and infectious (0.0074 kg/person/day).
Based on descriptive analysis in Figure 2, the domination characteristic of HHW based on the measurement of weight scale was infectious group with 79%, and then poisonous group 13%, combustible 6%, and the last corrosive with 2% percentage.From the sampling result there should be a serious concern to manage infectious group of HHW.Until now, there is no stated regulation including in SNI 19-2454-2002.Revision is needed in that SNI.In this research, HHW infectious group was included in the analyses based on the effect on health (infection spreading) that would be caused and the degrading of environment quality.This background was supported by the categorization conducted by Delgado et al., and Jin et al., [8][9].According to Delgado et al [8] classification HHW there are 8 categories, one of which is that it can cause an infection such as: rubber gloves, syringes, condoms, bandages and gauze bandages, while Jin et al confirm the statement "waste segregation at the source it self is extremely important as municipal solid waste turn hazardous when mixed with hazardous waste such as pain, dyes, batteries and human excreta".So it is clear that the addition of one (1) characteristics/category HHW as "infectious" is one that is relevant, both from a quantitative and health impacts and environmental degradation.
Based on the sampling results of the 400 families within 32 days in the city, HHW with the characteristics of "infectious" the most dominant and commonly found types of diapers, bandages, gauze, some condoms and plabot former infusion.The diversity of the characteristics of HHW in Pedurungan found in the district which is a region on a sample group of economic strata.
Different characteristics HHW based economic strata, does not mean the same with different characteristics Based HHW topography.The statistical results using Kruskal-Walis test showed no differences in the characteristics HHW based topographic regions (p-value 0.442).So that the test results can be interpreted to have similar characteristics to HHW based topographic regions in Semarang.

Comparisons with other countries
Previous research found in seven (7) different countries, including: India, Vietnam, Switzerland, Mexico, Greece, the UK and Hungary.For example, research conducted by Lakshmikantha and Lakshminarasimaiah in the State of Karnataka (India) [10], which reported that the results of sampling HHW in the City of 0.005 kg/person/day (300 tons/day or 0.9% MSW ).Results of another study, reported by Thanh et al [11] based on the results of the sampling in the Mekong (Vietnam) were reported in the city HHW generation is smaller, and only reaches 0.00053 kg/person/day (0.2% MSW) [11].Other studies have also reported that studies are not much different, as in Switzerland which reported its HHW generation of 2 kg/person/year in 2001 with a percentage (0.5% of MSW), which means lower than generation HHW in Semarang per year, which reached 3.65 kg/person/year with a percentage (5.1% MSW).
Research conducted by Otoniel et al in Morelia (Mexico) shows the same thing also that generation HHW City Morelia (Mexico) is estimated to 7.1 tonnes/day with a percentage of 1.6% of the total domestic waste [12].While in Semarang in 2014 is estimated to reach 16.0 tons/day HHW with a percentage of 5.1% of the total domestic waste.
Other studies have shown different results with this research.Research conducted by Zotos et al in Greece who reported HHW generation of 7,000 tons per year [13], further research reported by Otoniel et al on HHW generation in the UK amounted to 250,000 tons HHW / year with a percentage 0.9% HHW in MSW with the largest HHW category is aerosol (26%), paint (17%), oil (15%), batteries (14%) and bleach (10%).Different also reported from Hungary in 2002, there were 17,000 tons HHW or about 0.7% of MSW [12].
Based on the comparison HHW generation in India, Vietnam, Switzerland, Mexico, Greece, the UK and Hungary has been described previously, indicating generation HHW in Semarang higher than in the country of India, Vietnam, Switzerland and Mexico, but is smaller when compared to the generation HHW in Greek, English and Hungarian.This indicates the diversity of generation HHW level in each country.In addition to the comparison of from 11 countries, there are few studies that reported on the contribution/percentage HHW in domestic waste, including: Based on Table 1 shows that the percentage HHW in Semarang is similar to research done by Tuthill et al in Massachusetts, USA with a percentage of 5.7% [3].But the results of this study is lower to that of Ziaee et al in the city of Tehran that its HHW percentage reaches 10% of the domestic waste [14] [20].
2) The characteristic of HHW in Semarang was consist of corrosive, combustible, poisonous, and infectious.The largest characteristic of HHW in Semarang is Infectious.Domination characteristic of HHW based on the measurement of weight scale was infectious group with 79%, and then poisonous group 13%, combustible 6%, and the last corrosive with 2% percentage.

Table 1 .
Comparison of contribution/percentage HHW with domestic waste