Journal of Environmental Treatment Techniques 2021, Volume 9, Issue 1, Pages: 164-171 J. Environ. Treat. Tech. ISSN: 2309-1185 Journal web link: http://www.jett.dormaj.com https://doi.org/10.47277/JETT/9(1)171 Effect of Temperature and Pyrolysis Time in Liquid Smoke Production from Dried Water Hyacinth Rita Dwi Ratnani1,4*, Hadiyanto2,4 and Widiyanto3,4 1Chemical Engineering Department, Wahid Hasyim University, Semarang – Indonesia 2Chemical Engineering Department, Diponegoro University, Semarang – Indonesia 3Animal Husbandry Department, Diponegoro University, Semarang – Indonesia 4School of Postgraduate Studies, Diponegoro University, Semarang – Indonesia Received: 16/07/2020 Accepted: 22/10/2020 Published: 20/03/2020 Abstract This study aimed to investigate the use of water hyacinth to produce liquid smoke. The study observes the temperature and time variables of yield, pH, density, and refractive index in the production of liquid smoke from water hyacinth. The sequence of the work is as follows: first, water hyacinth was cut into 5 cm sections and then sun-dried for 2–3 d, depending on the weather. Next, 550 g of dried water hyacinth was added to the pyrolysis reactor. The temperature variations were 200°C, 400°C, and 600°C, and the time variations were 1, 4, and 7 h. As a result, liquid smoke was produced with varying yield, pH, densities, and refractive indices. The best results in this research are liquid smoke pyrolysis at a temperature of 400°C and 4 h with the acquisition of a yield of 93 mL, pH 2–4, a density of 1.080,8 gr/mL, and a refractive index of 1.339,6, with chemical component 41.45% total acid, 2.44% phenol and 56.10% carbonyl. Keywords: Influence of temperature and time, liquid smoke, pyrolysis, water hyacinth 1 Introduction1 capacity and water quality. Some handling efforts that have been A strategy that can be used to manage the lake ecosystem is made have not shown significant results [1]. the use of water hyacinth. The utilization of water hyacinth to create a product that is beneficial to Lake RawaPening is expected. RawaPening is currently dominated by water hyacinth (Eichornia crassipes), although it has a fairly high biodiversity. Water hyacinth grows at an increasing speed. Its distribution is expanding from year to year, thus resulting in the occurrence of sedimentation in RawaPening. This very high sedimentation rate has caused siltation in RawaPening. In 2020 Lake RawaPening is estimated to contain more than 4,752,961.04 tons of sediment. Sedimentation that occurred in Lake RawaPening as shown in Figure 1. The amount of sediment caused by the breeding of water hyacinth reached 187,839.45 tons. The sedimentation rate in Lake RawaPening increased after 3 years. In 2008, the maximum depth of the swamp had reached 18.4 m around the Figure 1. Simulation of the distribution of water hyacinth with control Bukitcinta ecotourism. Based on the sedimentation rates, Lake (a) and (b) without control in 2020 [2] RawaPening in 2017 only had a depth of around 5–8 m. With the The process of water hyacinth pyrolysis takes place very effective efforts to control the breeding of water hyacinth which quickly so that it can offset its growth. One alternative is to can be simulated in 2020, the depth will remain. However, if the produce liquid smoke through pyrolysis. Pyrolysis is a breeding is not controlled, the sedimentation rate will continue to “destructive distillation” or dry distillation process. It is an increase. It is estimated that Lake RawaPening Lake in 2020 will irregular decomposition process of organic materials caused by only have a depth of 2–5 m. With effective treatment, the spread heating without contact with the outside air. During pyrolysis, of water hyacinth in Lake RawaPening will decrease, but will not heat energy induces oxidation, resulting in the breakdown of be significant in 2020. The problem faced by Lake RawaPening complex carbon molecules, mostly into carbon or charcoal. is the rapid increase in sedimentation rate and growth of water Pyrolysis is one of the thermochemical technologies. Converting hyacinth, which has an impact on the reduction of storage Corresponding author: Rita Dwi Ratnani, (a) Chemical Engineering Department, Wahid Hasyim University, Semarang – Indonesia and (b) School of Postgraduate Studies, Diponegoro University, Semarang – Indonesia. E-mail: [email protected] 164 Journal of Environmental Treatment Techniques 2021, Volume 9, Issue 1, Pages: 164-171 biomass into energy and chemical products consisting of liquid, Table 1: Comparison of water hyacinth components with other biochar and gas [2, 3, 4, 5]. Material During pyrolysis, three types of products are produced: (1) Chemical No Biomass type % (d.b) The gases released in the carbonization process, which are mostly components in the form of CO gas and partly in the form of flammable gases, Hemicellulose 36.26 such as CO, CH4, H, and other low-level hydrocarbons. (2) 1 Water hyacinth Cellulose 20.64 Distillate in the form of liquid smoke and tar. The main Lignin 7.32 compositions of the product stored are methanol and acetic acid. Hemicellulose 21–25 The minor components include total phenol, methyl acetate, formic acid, butyric acid, and others. (3) Residue in the form of 2 Softwood Cellulose 54–58 carbon. Wood has almost the same components and the pyrolysis Lignin 26–29 process results in the decomposition of woods constituent Hemicellulose 28–31 compounds. The constituent compounds of liquid smoke are 3 Hardwood Cellulose 43–53 formed via pyrolysis of three wood components, namely, Lignin 18–24 cellulose, hemicellulose, and lignin. These chemical components Hemicellulose 5.26–20.54 include (1) acids which can affect the taste, pH, and shelf life of smoked products; (2) carbonyl which reacts with proteins and 4 Coconut shell Cellulose 28.26–32.52 forms chocolate staining; and (3) phenols which mainly produce Lignin 27.27–36.51 aroma and exhibit antioxidant activity [6, 7, 8, 9]. Pyrolysis is Hemicellulose 29.33–30.46 the process of heating a substance without oxygen at 5 Cassava stems Cellulose 44.01–48.01 temperatures above 150°C. It is generally performed on Lignin 15.39–15.98 wood. During the pyrolysis process, wood components decompose into hemicellulose, cellulose, and lignin. Based 2.2 Pyrolysis Equipment on the test results of the components of the wood Figure 2 presents the tools used for the pyrolysis process. constituents that have been carried out on water hyacinth Pyrolysis is performed in a reactor made of SS-304 plates that are and compared with other wood materials can be seen in 3 mm thick. The chancellor was designed so that it can carry 10 kg of dried water hyacinth stems cut into 5-cm sections as much Table 1. Pyrolysis produces substances, namely, charcoal, as 550 g. because water hyacinth is very light so that the mass is liquid smoke, and liquid gas. Liquid smoke formed by the sufficient for the process. The tool was connected to the hemicellulose pyrolysis process produces furfural, which is condenser by a ¼ SS pipe. The condenser was equipped with a a furan derivative, as well as a long series of carboxylic spiral pipe so that it can condense the smoke generated by the acids, acetic acids, and homologues at temperatures of pyrolysis reactor. The length of the spiral pipe influences the yield 200°C–250°C. Pyrolysis of cellulose at a temperature of of condensation. The longer the pipe, the longer the residence 280°C-320°C will produce acetic acid and a small amount time in the condenser, so that the condensation process becomes of furan and phenol. Lignin pyrolysis produces phenols and more maximal. The length of the spiral pipe on this condenser is phenol ethers at 400°C. Liquid smoke is a liquid produced 3 m. The heating process is performed using heater to reach the temperature of 600°C. To maintain the desired temperature, a from condensation of wood smoke through the pyrolysis temperature control device was installed using a control valve so process. The components of liquid smoke containing acids that a maximum temperature of 1000°C can be reached can affect the taste, pH, and shelf life of smoked products. The carbonyl component reacts with protein and turns into a chocolate color. The phenol component is the main constituent of aromas and exhibits antioxidant activity. In addition to acid, carbonyl, and phenol, liquid smoke also contains water, tar, and polycyclic aromatic hydrocarbons (PAH), such as benzo(a)pyrene, which are known as carcinogens, thus harmful to health [10, 11, 12]. This research aimed to produce liquid smoke from water hyacinth and examine the effect of temperature and time of pyrolysis on the quality of the resulting liquid smoke in terms of yield, pH, density, and refractive index. 2 Materials Methods 2.1 Material Preparation Figure 2: Equipment: (a) pyrolysis, (b) condenser, (c) valve control, (d) The material used was water hyacinth obtained from Lake tar valve, (e) liquid smoke valve, and (f) heater RawaPening, specifically at Rowoboni hamlet, Banyubiru District, Semarang. The stems of the water hyacinth were 2.3 Pyrolysis Water Hyacinth separated from their leaves and roots. Then, the stems were sun Water hyacinth was obtained from Lake RawaPening, and dried for 2–3 d until they turned brown. The water hyacinth stems only the stem was taken. The stems were then cut into 5 cm were cut into 5 cm sections for ease of use during pyrolysis. sections and then sun dried until water content was around 15%. 165 Journal of Environmental Treatment Techniques 2021, Volume 9, Issue 1, Pages: 164-171 The dried water hyacinth stem where then into the reactor recorded.