ABSTRACT Noise had the potential to affect comfort and health, especially from the operational activities of palm oil mill equipment. The risk of hearing damage to employees could be caused by noise exposure due to high noise levels or excessive cumulative exposure time. This study aimed to analyze the noise of the work environment at PT Bina Pitri Jaya, determined the maximum time of expo…
ABSTRACT Noise is an environmental hazard caused by excessive sound intensity. According to Minister of Environment Regulation No. 48 of 1996, noise refers to unwanted sounds from activities or operations that, at certain levels and durations, can disrupt human health and cause work accidents. This research aims to analyze environmental noise in the surroundings of Simpang Baru Panam Market, m…
ABSTRACT Pekanbaru City is one of the cities that has experienced an increase in the physical development of the city and the population. This results in higher population density. The pollutant that has a significant impact is falling dust. This study aims to determine the concentration of falling dust and Pb content in falling dust. The research method used was the gravimetric method and tes…
ABSTRACT The development of the tofu industry in Indonesia is very rapid along with the increasing consumption needs of the community, this can cause environmental problems due to the waste water produced. The high organic compounds contained in tofu liquid waste is evidence that COD concentrations are increasing and if discharged into waters without prior treatment it causes pollution. The so…
This study aimed to produce e-worksheet based on Problem Based Learning (PBL) using the flip builder application to improve students' learning outcomes in acid-base material. This research is motivated by students' learning outcomes which are still low and the lack of availability of teaching materials that are suitable for what the students like. The method used in this study is the Research …
ABSTRACT The rapid development of the oil palm plantation industry is currently causing more and more waste to be formed, one of which is palm oil frond waste. Palm fronds have a carbon content of 81.25% which is quite high so that they can be used as activated carbon as an adsorbent which is useful for anticipating or minimizing Cu2+ ion pollution in the environment. This study aims to study …
ABSTRACT The rapid development of the oil palm plantation industry is currently causing more and more waste to be formed, one of which is palm oil frond waste. Palm fronds have a carbon content of 81.25% which is quite high so that they can be used as activated carbon as an adsorbent which is useful for anticipating or minimizing Cu2+ ion pollution in the environment. This study aims to study …
ABSTRACT The temperature of the human body can easily change according to the surrounding temperature. Indonesia's tropical climate and global warming are also other factors that make the weather unpredictable. To overcome this problem, a tool is needed to help stabilize the temperature in the human body. One of these auxiliary tools is a fan, but the fans that are widely used today are still …
ABSTRACT Microcontroller technology in industry is programmed in such a way as to be able to control equipment or machines automatically, in order to save time and human effort, for example problems in the parking system, can be controlled by technology, by designing a simple parking system using a microcontroller. Based on this, the researcher felt the need to make an automatic car parking r…
ABSTRACT Chip pin processing plays an important role in the pulping production process. Pin chip separation was carried out on the pin screen diamond roll acrowood machine which aims to separate pin chips from fines. A decrease in the performance of the diamond roll acrowood pin screen machine will reduce pulp production at PT RAPP. The purpose of this research is to study the factors influenc…
ABSTRACT Recausticizing Lime Kiln is one of the areas in PT RAPP which is responsible for producing white liquor cooking liquid for wood chip cooking needs in the digester. In the process, the causticizing reaction produces a byproduct in the form of lime mud (CaCO3) which can be converted back into burnt lime (CaO). This process requires a lime kiln unit to burn lime mud so that a calcination…
ABSTRACT At this time, one type of paper that is in great demand is the offset paper type. One of the qualities that must be met on offset paper is that the paper has a good internal bond. The internal bond value is closely related to the refining process, refining load and cationic starch. With the increase in the internal value of the bond, the strength properties of the paper will be better…
ABSTRACT Black liquor or WBL is obtained from washing pulp generally has a solid content of 15-16%. This WBL must be concentrated until it reaches 80-82% or it can be called Firing Liquor. The unit used to concentrate WBL is called evaporation plant unit. The results of the process in the evaporator unit are firing liquor and condensate. One of the condensates, namely condensate C (foul c…
ABSTRACT In the chemical plant department, chlorine dioxide is produced by reacting strong chlorate and hydrochloric acid. Strong chlorate is produced in the electrolysis process that occurs in the electrolyzer. Then, the strong chlorate that is formed will be reacted with HCl in the generator and then leave a weak chlorate solution which overflows to the evaporator. Weak chlorate evaporator i…
SUMMARY Papaya seeds (Carica papaya) have an active component in the form of protein which can act as a coagulant agent. This study aims to prepare, characterize and determine the effectiveness of papaya seeds as a biocoagulant in removing turbidity, TSS and TDS of peat water. Papaya seeds were prepared with each of the solvents akua DM and 0.5 M NaCl at various extraction times (1, 2, 5, 8 an…
SUMMARY Dye waste has a negative impact on health and the environment, so it must be treated before being discharged into the environment. The Fenton method is an effective method for the degradation of dyes into environmentally friendly compounds. In this study, the synthesis of the MnO2/fly ash composite was carried out using the precipitation method. MnO2 was synthesized by mixing together …
The learning process has several important elements including teaching materials. The use of teaching materials certainly greatly influences the learning process. Teaching materials that are in accordance with the development of the 21st century are e-modules. An easy platform to use in learning activities and for making e-modules, namely Google Sites. Google sites are not software that must be…
This study aims to produce interactive learning media using Adobe Animate on the subject of chemical equilibrium for class XI SMA/MA equivalent and to describe the results of a response questionnaire from users of instructional media. This research is a development research using the Research and Development (R&D) method with the ADDIE development model (Analysis, Design, Development, Implement…
This research is aimed to produce E-LKPD based on Phenomenon Based Learning on the subject thermochemistry class XI SMA/MA which is valid and to know the user’s response to the E-LKPD based on the subject of thermochemistry class XI SMA/MA if used in the learning process. This type of research is development model which includes Define, Design, Develop and Disseminate.This research was only c…
This study aims to produce a valid E-LKPD based on the STEM approach using liveworksheet material colligative properties of the solution and knowing the teacher's assessment and student user responses to the E-LKPD. This study uses the ADDIE development model. Data analysis techniques used validation questionnaires and user response questionnaires. The trials were carried out on a small sca…