Environmental problems has become a global issue and need a serious attention. Not only solid waste, liquid waste also have negative effects on the environment and human health. The existence of these needs must be balanced with the development of wastewater treatment technologies, both for liquid waste from factories, hospitals, and other sources. Various methods have been applied to solve the problem of liquid waste, mostly using a chemical process by reaction with chemicals. Purification of waste water by chemical processes have various shortcomings. Another alternative is the principle of electrocoagulation. Electrocoagulation is a process of coagulation or clotting of the electrical power through the process of electrolysis to reduce the metal ions and particles in the water. The basic principle of electrocoagulation is a reduction and oxidation (redox). This research will be designed a tool that applies the principles of electrocoagulation for wastewater purification process with the development of several existing tools of electrocoagulation, which is portable, it can eliminate many kinds of pollutants, including heavy metals that are dangerous, using bubble system as binding contaminants, more stronger than the floc Al (OH) 3, and use the Self-Cleaning system with a reverse voltage so that the cleaning process can reduce operational costs.  Keywords: waste water, electrocoagulation, electrodes, self-cleaning systemMasalah lingkungan telah menjadi isu global dan perlu mendapat perhatian serius. Tidak hanya limbah padat, limbah cair juga memiliki efek negatif terhadap lingkungan dan kesehatan manusia. Adanya kebutuhan ini perlu diimbangi dengan pengembangan teknologi pengolahan air limbah, baik untuk limbah cair dari pabrik, rumah sakit, dan sumber lainnya. Berbagai metode telah diterapkan untuk menyelesaikan masalah limbah cair, sebagian besar menggunakan proses dengan reaksi bahan kimia. Pemurnian air limbah dengan proses kimia memiliki berbagai kekurangan. Alternatif lain adalah menggunakan prinsip elektrokoagulasi. Elektrokoagulasi adalah proses koagulasi atau penggumpalan dengan daya listrik melalui proses elektrolisis untuk mengurangi ion logam dan partikel di dalam air. Prinsip dasar dari elektrokoagulasi adalah reduksi dan oksidasi (redoks). Pada penelitian ini akan dirancang sebuah alat yang menerapkan prinsip-prinsip elektrokoagulasi untuk proses pemurnian air limbah dengan pengembangan terhadap alat elektrokoagulasi yang telah ada, yaitu bersifat portabel, dapat menghilangkan berbagai jenis polutan, termasuk logam berat yang berbahaya, menggunakan sistem gelembung sebagai pengikat kontaminan, yang lebih kuat daripada flok Al(OH)3, dan menggunakan sistem Self-Cleaning dengan tegangan balik dimana proses pembersihan dapat dilakukan secara otomatis sehingga mengurangi biaya operasional.  Kata kunci: air limbah, elektrokoagulasi, elektroda, sistem self-cleaning

Road pavement is one of the most important parts to provide better transportation services, for humans and or goods. To get a good road pavement, proper asphalt mixture design is needed under the required standards. In designing asphalt mixture, a large amount of materials is needed but, those materials will not be available forever. With those material limitations, alternative material is needed as a substitute, especially waste materials. One of the alternative material that could be useful is Reclaimed Asphalt Pavement (RAP). This study aims to determine the effect of RAP towards asphalt concrete mixture, based on its Marshall parameters. The method that was used in this study is a stability test, using Marshall Method. The test was carried out on asphalt concrete mixtures with four different types of RAP content, which were 25%, 50%, 75%, and 100% and with an optimum asphalt content of 5,5%. Based on these results, it was found that with the addition of RAP, it could increase the stability value of asphalt concrete, with an optimum content of RAP that can be used is 52,08%. The result shows that not only RAP could be used as an alternative, but also gives good results towards the stability value of asphalt concrete.

Today online payments are in demand by most people. Because of the practicality of making payments digitally. This phenomenon has encouraged many industries in the field of finance to make breakthroughs in technology to develop marketing through platforms that have been built. Of course, the platform that is built is a platform that is following the business process requirements of the company. Business processes in the finance industry have become a digital payment platform, making companies in the finance sector carry out digital transformations. Processes that have been carried out manually have been replaced with digital and online processes that bring many opportunities to the finance industry. At the same time creating market opportunities for the company. Thus creating a very broad market for companies carrying out digital transformation. Communities benefit from the changes made by the company. The benefit is that people do not need to make payments or transfer funds. No need to queue up payments at the bank or payment counters. By simply clicking on the smartphone, the payment can go directly to the intended account. This revolution in digital finance transformation has both positive and negative impacts. Positive impacts such as the ease of transferring funds, and negative impacts if the company does not carry out protection or cyber security will have an impact on the company and the user community. Therefore, finance companies must protect or secure data while using the payment platform. A lot of education is done for the people who use the payment platform, where the platform must always update the version. For this reason, payment platform provider companies must be able to make continuous changes. Continuous improvement and continuous development make it a must for payment system service operator companies. Related to the description above, payment system companies must implement Enterprise Architecture for the benefit of the company. The result of Enterprise Architecture is a blueprint of all company production components or an Information Technology Blueprint. This is the goal of research on payment systems for companies carrying out digital transformation

A problem that may occur in road pavements that are relatively impermeable to water is the runoff of water, because water cannot seep to the bottom of the pavement, so it can be drained into a drainage system. To overcome this problem, a porous asphalt mixture can be used. In this study the use of concrete waste was tried to replace the coarse aggregate used to make porous asphalt mixtures. For this reason, experiments are carried out in the laboratory, by making some specimens, which are then subject to Marshall testing. The coarse aggregate used to make the mixture is replaced by concrete waste, with a proportion of 25%, 50%, 75%, and 100%. The results of this study indicate that concrete waste changes the Marshall parameters of a porous asphalt mixture. Keywords: porous asphalt mixture; Marshall testing; concrete waste; Marshall parameter.  Abstrak Suatu permasalahan yang mungkin terjadi pada perkerasan jalan yang relatif kedap air adalah adanya limpasan air, karena air tidak dapat meresap hingga ke bawah perkerasan, untuk dapat dialirkan ke suatu sistem drainase. Untuk mengatasi masalah tersebut, dapat digunakan campuran beraspal berpori. Pada studi ini dicoba peng-gunaan limbah beton untuk mengganti agregat kasar yang digunakan untuk membuat campuran beraspal berpori. Untuk itu dilakukan percobaan di laboratorium, dengan membuat benda-benda uji, yang selanjutnya dilakukan pengujian Marshall. Agregat kasar yang digunakan untuk membuat campuran diganti dengan limbah beton, dengan proporsi sebesar 25%, 50%, 75%, dan 100%. Hasil penelitian ini menunjukkan bahwa limbah beton mengubah parameter Marshall campuran beraspal berpori. Kata-kata kunci: campuran beraspal berpori; pengujian Marshall; limbah beton; parameter Marshall.

The infrastructure growth has an impact on reducing green areas, which will be followed by reduced water catchment areas. Porous concrete is one of the porous materials that can be used on a pedestrian walk, which is able to drain water. The porous concrete has a limitation strength. This research aims to determine the effect of using various content of chemical additive and polypropylene fibers for porous concrete mixtures related to the compressive strength and permeability values. This experimental method referring to ACI 522R-10 Standard. That specimens using chemical additives and variations of polypropylene fibers: 0.05%, 0.1%, 0.15%, 0.2%, and 0.25% by weight of cement. The results showed that the specimen which had the highest compressive strength was 16.9 MPa, which was added 0.25% polypropylene fiber. The addition of polypropylene fibers increases the compressive strength value by 5.6%. Based on the compressive strength and permeability graphs, it can be estimated that the optimal content of polypropylene fiber is 0.17% by weight of cement.