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This study aims to analyze visitors’ Willingness to Pay (WTP) and to estimate the economic value in supporting the development of Gunung Meja Nature Tourism Park (TWA) as a conservation area. This study employed the Contingent Valuation Method (CVM) with a total of 156 respondents. Data were analyzed using descriptive quantitative methods to obtain the average WTP value and its distribution. The results showed that the average WTP of visitors was IDR 19,300 per person, with the highest distribution in the range of IDR 10,000–30,000 and a dominant value of IDR 20,000 (23%). The estimated economic value of the area based on WTP reached IDR 3,939,245,800 per year, which is higher than the actual revenue of IDR 2,755,431,000 per year. The difference of IDR 1,183,814,800 indicates a potential increase in revenue through tariff adjustment. These findings indicate that visitors have a higher willingness to pay compared to the current tariff. Therefore, the WTP value can be used as a basis for determining optimal tariff policies to support sustainable management of conservation areas and to maintain their ecological functions.

BPJS Health has incurred losses exceeding 200 billion rupiah over a two-year period due to the payment of contributions that were discontinued by participants who had utilized maternity services. Data show that 64.7% of mothers registered as BPJS Health participants only one month prior to childbirth, after which 43% either withdrew their membership or failed to continue paying contributions following delivery. The highest proportion of this behavior was observed among independent participants or non-wage recipients (PBPU). In Jambi Province, the highest level of contribution non-compliance occurs in Jambi City. In 2023, there were 77,489 participants with contribution arrears, resulting in financial losses amounting to 60.1 billion rupiah. Contribution non-compliance is influenced by various factors. This study aims to analyze the factors contributing to non-compliance among independent participants in paying BPJS Health contributions after utilizing childbirth services in Jambi City. The findings revealed that 33.3% of independent participants were non-compliant in paying BPJS Health contributions after using maternity services. Significant associations were found between contribution non-compliance and the number of family members (p = 0.001), level of knowledge (p = 0.000), illness perception (p = 0.001), clinical assessment (p = 0.000), and willingness to pay (WTP). Based on these findings, it is recommended that BPJS Health consider implementing a waiting period policy for participants intending to utilize maternity services. In addition, the Jambi City Government should strengthen promotive efforts to educate the public and raise awareness of the importance of health insurance in safeguarding household financial security.

Kebutuhan akan angkutan umum berbasis rel berdampak luas terhadap pertumbuhan penduduk dan aktivitas ekonomi Jakarta. Penelitian ini bertujuan untuk membandingkan KRL Commuter Line dan MRT Jakarta dari dua aspek Kemampuan Membayar dan Kesediaan Membayar. Analisis ini dilakukan dengan pendekatan studi literatur deskriptif-komparatif. Jurnal, prosiding, tesis, dan dokumen kebijakan yang digunakan sebagai sumber sekunder melalui analisis konten. KRL dengan tarif dasar sebesar Rp. 3.000,- mendapatkan ATP Rp. 3.770,- – Rp. 4.825,- dan WTP Rp. 3.974,- – Rp. 5.057,-, yang berarti KRL berpotensi untuk perubahan tarif sebesar Rp. 770,-. MRT Jakarta untuk tarif sebesar Rp. 14.000,- untuk fase 2A, ATP menunjukkan daya beli Rp. 17.044,- dan WTP Rp. 19.000,-. Pola penumpang terikat muncul dan sangat bergantung, di sisi ujung, dengan WTP yang tinggi dan ATP yang rendah, untuk kedua moda, menandakan MRT dan KRL sangat efisien dan nyaman. Penelitian ini berpendapat agar penyesuaian tarif dilakukan dan untuk jangka panjang, tarif perlu diikuti dengan peningkatan mutu pelayanan dengan penyesuaian yang progresif dan sesuai dengan penghasilan bagi masyarakat berpendapatan menengah ke bawah, agar mutu pelayanan tidak berkualitas rendah.

This study aims to analyze the influence of domestic wastewater management and space utilization control on pests in river-equivalent areas in Lalat Regency. The main problem raised is the low effectiveness of environmental management in the corresponding area due to the increase in domestic activities and its weakness in spatial planning. The approach used is quantitative with multiple linear regression methods. Primary data were obtained through questionnaires to 200 respondents, and secondary data were obtained through documentation studies and field observations. The results of the analysis showed that simultaneously, the five independent variables (environmental management, space availability, community participation, government supervision, and environmental infrastructure) had a significant effect on the habitat in the corresponding area (p = 0.046). Partially, only waste management (p = 0.016) and community participation (p = 0.042) had a significant effect. A determination coefficient (R²) value of 7.5% indicates that the desires of a region are also influenced by other external factors. Based on these findings, it is recommended that the need to improve the household waste management system through the construction of communal WWTP and improve the quality of household septic tanks, as well as community empowerment through the establishment of environmental forums and sustainable sanitation education to support spatial control and poverty in commensurate areas.

The Snail Canning Industry has the potential to impact the environment if wastewater with high organic compound content is not treated first. This study aims to analyze the performance of the Snail Canning Industry Wastewater Treatment Plant (WWTP) based on BOD, COD, and TSS parameters. The method used is descriptive, with primary data obtained through interviews and secondary data from laboratory test results. Measurements were taken at the inlet and outlet points of the WWTP, then compared with the quality standards based on the Regulation of the Minister of Environment No. 5 of 2014. The results showed that the WWTP succeeded in reducing the concentration of BOD from 201 mg/L to 6 mg/L, COD from 315 mg/L to 24 mg/L, and TSS from 25 mg/L to 6 mg/L. The reduction efficiency of each parameter was 97.01% for BOD, 92.38% for COD, and 76% for TSS. All outlet results met the established quality standards. This indicates that the wastewater treatment process at the IPAL functions effectively in reducing the levels of pollutant parameters in wastewater.

Using a descriptive method with a triangulation approach including observation, document analysis, and interviews this study ensures data reliability. Daily monitoring is conducted on wastewater flow and pH levels, while monthly laboratory analysis covers eight key parameters: Total Suspended Solids (TSS), iron (Fe), copper (Cu), zinc (Zn), total chromium (Cr), phosphate (PO³), oil and grease, and pH to evaluate the perfomance of the treatment system. The treatment process begins with the inflow of 960 m³ of wastewater per day into the storage pond, where aeration is applied to ensure homogenization before being transferred to the neutralization unit. pH adjustment is carried out by adding NaOH or HCl before the wastewater undergoes coagulation and flocculation stages. The study’s findings indicate that the WWTP meets the environmental quality standards established in accordance with the Decree of the Head of the Investment Coordinating Board of the Republic of Indonesia (2020), Number SK.214/1/KLHK/2020 concerning the Permit for Wastewater Disposal into the Sea on Behalf of PT Pembangkit Jawa Bali Unit Pembangkitan Gresik. This study emphasizes the importance of systematic monitoring and treatment in wastewater management.

PT X is a chemical manufacturing company specializing in the production of phosphoric acid and sulfuric acid. In addition to waste generated from production processes, PT X also produces domestic wastewater originating from supporting activities such as employee barracks, offices, and laundry facilities. This domestic wastewater contains parameters that can potentially pollute the environment, such as BOD, COD, TSS, ammonia, and Total Coliform, some of which exceed the quality standards set by the Minister of Environment Regulation No. 68 of 2016. This study aims to design an effective Domestic Wastewater Treatment Plant (DWTP) system to process the domestic wastewater of PT X. The proposed DWTP system consists of a collection tank, Anaerobic Baffled Reactor (ABR), Aerobic Biofilter, and disinfection unit. Each unit is designed to reduce pollutant parameters to meet quality standards. Based on the calculations, this system can handle a wastewater flow rate of 21.91 m³/day with high treatment efficiency for critical parameters. The study results indicate that the proposed DWTP design can reduce environmental pollution, improve wastewater treatment operational efficiency, and comply with applicable regulations. Implementing this system is highly recommended to ensure environmental sustainability and the continued operations of PT X.

PT X is one of the industries located in East Java that produces liquid waste. The industrial sector is indeed a large producer of liquid waste. One of the liquid wastes produced is domestic liquid waste. The industry has the responsibility to manage domestic liquid waste in accordance with Government Regulation Number 22 of 2021 which requires industries to carry out domestic wastewater management before being discharged into water bodies. One of the efforts made by the industry to manage the domestic wastewater produced is to use a Domestic Wastewater Treatment Plant. The quality of the treated water has met the domestic wastewater quality standards to be discharged into river and does not pollute the environment.

:Pakistan is a developing country. Its transportation infrastructure mainly consists of road network. About 95% passengers and fright is transported using the road network. This high demand on road network is because of the unreliable railway system between the cities. Due to such high demand on road network the accident involvement risk of an individual is much high as compared to developed countries. This study uses a new modeling approach to estimate road safety risk for WTP.  A correlated random parameters Tobit model (heterogeneity-in-mean) is integrated with machine learning (Decision tree).  The decision tree categorizes higher-order interactions, while the model captures unobserved correlations and heterogeneity. The framework examines WTP determinants using a representative sample of 3178 road users from Pakistan. The model estimates WTP for different (fatal and severe injury) risk reductions to monetize road traffic crash costs. Results show maximum respondents are willing to support safety improvement policies. The model reveals significant WTP heterogeneity linked to perceptions of road safety and accident risk. Systematic preference heterogeneity emerges through higher-order interactions, offering insights into WTP relationships. Marginal effects highlight varying sensitivities to explanatory variables, quantifying their impact on WTP probability and magnitude. The framework provides two key contributions. It identifies public WTP determinants, emphasizing heterogeneous effects. It also helps in prioritization safety policies by understanding public sensitivity to WTP. The insights further emphasizing on the importance of road safety interventions to the specific socio-economic profiles of road users. This study offers a significant contribution to road safety improvement by providing valuable recommendations for policy makers. By integrating detailed socio-economic factors, it also addresses the urgent need for targeted traffic safety interventions in Pakistan. These findings are expected to aid policymakers and stakeholders in developing effective strategies to enhance road safety and reduce the accident involvement risk effectively.

iquid waste produced by the food industry has complex characteristics that depend on production capacity. Liquid waste treatment is carried out physically, chemically, and biologically to reduce the concentration of pollutants that pose environmental problems. PT. X is one of the companies that produces food products. The company has been implementing an environmental management system, particularly wastewater treatment, using WWTP technology. The research aims to assess the performance of liquid wastewater treatment processes at PT. X. The research method used is descriptive, with data collection through direct observation and sampling at the WWTP outlet of PT. X. After testing, the research results show that all main parameters produced by PT. X's WWTP comply with the quality standards of the East Java Governor Regulation No. 72 of 2013. Overall, the WWTP performance remains good.    

Pakistan is a developing country. Its transportation infrastructure mainly consists of road network. About 95% passengers and fright is transported using the road network. This high demand on road network is because of the unreliable railway system between the cities. Due to such high demand on road network the accident involvement risk of an individual is much high as compared to developed countries. This study uses a new modeling approach to estimate road safety risk for WTP.  A correlated random parameters Tobit model (heterogeneity-in-mean) is integrated with machine learning (Decision tree).  The decision tree categorizes higher-order interactions, while the model captures unobserved correlations and heterogeneity. The framework examines WTP determinants using a representative sample of 3178 road users from Pakistan. The model estimates WTP for different (fatal and severe injury) risk reductions to monetize road traffic crash costs. Results show maximum respondents are willing to support safety improvement policies. The model reveals significant WTP heterogeneity linked to perceptions of road safety and accident risk. Systematic preference heterogeneity emerges through higher-order interactions, offering insights into WTP relationships. Marginal effects highlight varying sensitivities to explanatory variables, quantifying their impact on WTP probability and magnitude. The framework provides two key contributions. It identifies public WTP determinants, emphasizing heterogeneous effects. It also helps in prioritization safety policies by understanding public sensitivity to WTP. The insights further emphasizing on the importance of road safety interventions to the specific socio-economic profiles of road users. This study offers a significant contribution to road safety improvement by providing valuable recommendations for policy makers. By integrating detailed socio-economic factors, it also addresses the urgent need for targeted traffic safety interventions in Pakistan. These findings are expected to aid policymakers and stakeholders in developing effective strategies to enhance road safety and reduce the accident involvement risk effectively.

Abstract Rainfall or discharge data is obtained from the river basin authority by conducting hydrological analysis using the Nakayashu Synthetic Unit Hydrograph method to obtain the peak flood discharge and performing a dependable flow analysis (Q80%) using probability equations. On January 2, 2020 there was a flash flood that destroyed at least 1,410 houses, 30 bridges and hydraulic buildings located in the ciberang river flow among them is the PDAM row water intake structure. The need for hydrological studies to predict flood discharge as data needed in planning the stability of hydraulic building structures and determining the water surface elevation for intake operations. The results of the hydrological study of the Ciberang watershed obtained the design flood discharge values for specific return period of Q2 = 205,1 m3/s, Q5 = 340,5 m3/s, Q10 = 406,4 m3/s, Q25 = 475,6 m3/s, Q50 = 518,1 m3/s, Q100 = 549,6 m3/s. The estimated historical flash flood discharge that occurred in early 2020 in the ciberang river upstream of the Karian reservoir based on the testimony of residents as high as 8 meters is equivalent to the design discharge for Q25, which is 475.6 m³/s. The results of the dependable discharge (Q80%) calculations for the Ciberang watershed indicate that the minimum discharge occurs in September at 7.22 m³/s, while the maximum discharge occurs in February at 37.0 m³/s.   Keywords: Hidrology, Rainfall Plan, Flood Discharge Plan, Dependable Discharge.

Urban sustainability presents considerable challenges, especially in the management of energy and wastewater treatment systems. Rapid urbanization intensifies the demand for water and energy, leading to increased pressure on existing infrastructure and resources. Wastewater management is essential for urban water sustainability, as untreated wastewater poses significant environmental and health risks. Moreover, wastewater treatment processes are energy-intensive, complicating the balance between environmental goals and energy consumption. To address these challenges, integrating decentralized renewable energy systems, such as solar, biogas, and wind, with wastewater treatment plants (WWTPs) offers a promising solution. This integration can reduce reliance on centralized power grids, enhance energy self-sufficiency, and promote sustainability. The application of Circular Economy principles, which emphasize resource recovery and system decentralization, is key to this integration. However, technological, economic, and regulatory barriers exist, limiting widespread adoption. This study explores the feasibility of coupling renewable energy with WWTPs, focusing on energy flow simulations, environmental impacts, and economic evaluations. The results indicate that integrating renewable energy can significantly reduce greenhouse gas emissions, lower operational costs, and improve the resilience of urban water systems, making it a viable option for sustainable urban development.

Waste sludge is sludge that contains a lot of solids resulting from solid-liquid separation from industrial waste. The waste sludge produced from the waste processing process will create new problems in handling because it can pollute the environment. This research will discuss the use of IPAL sludge originating from the Sludge Drying Bed (SDB) to be used as organic fertilizer. In the process of making organic fertilizer in the cake and snack industry by monitoring parameters such as color, texture, smell and properties of organic fertilizer during the process of making organic fertilizer. The characteristic results obtained in this research are blackish brown color, rough texture, earthy odor and the resulting moisture is dry. Thus, the use of WWTP sludge as organic fertilizer offers an innovative and industrial solution that contributes positively to the environment.  

PT X is a company engaged in animal slaughtering and produces liquid waste in the process of its activities. Located in Banyuwangi Regency, East Java Province, this study aims to determine the effect of the implementation of the Wastewater Treatment Plant (WWTP) system on the quality of PT X's wastewater. The effect of implementing the WWTP system can be measured through baseline data collection, evaluation of WWTP effectiveness, observation of WWTP operation and maintenance, and recommendations in accordance with the Regulation of the Minister of Environment and Forestry of the Republic of Indonesia Number 68 of 2016 concerning Domestic Wastewater Quality Standards. Pollutant parameters in wastewater include BOD, COD, TSS, and O&G (Oil & Grease) that exceed the quality standards. After the implementation of the WWTP system, the effluent results showed a decrease and no longer exceeded the quality standards, proving that the implemented WWTP system has a positive effect on the quality of the PT X abattoir discharge water.

Tujuan penelitian adalah Untuk mengetahui berapa besar Biaya Operasional dan Kendararaan (BOK) Studi Kasus Angkudes Trayek Pasar Ungaran- Kalongan. Objek dari penelitian ini adalah Penentuan besaran tarif angkutan membutuhkan penanganan dan kebijakan. Karena harus dapat menjembatani kepentingan penumpang selaku konsumen dan pengelola angkutan umum. Trayek Pasar Ungaran, sepanjang 7,4 km, dengan data didapat dengan cara penyebaran kuesioner kepada pengguna angkutan, Untuk menganalisa berapa besar Biaya Operasional Kendaraan dan untuk dan mengetahui daya beli penumpang dari kempuan (Ability) dan kemauan (Willingness) untuk membayar tarif bus tersebut. Penelitian ini dilakukan selama 1 minggu pada hari kerja dan hari libur, yaitu pada tanggal 8 hingga 13 Januari 2024. Hasil analisis data menunjukan tarif berdasarkan BOK Rp. 9.222,96,-berdasarkan Ability To Pay (ATP) pada hari kerja (weekday) sebesar Rp. 6.666,67,- dan hari libur (wekkend) Rp. Rp. 10.000,00,- dan berdasarkan Willingness To Pay (WTP) pada hari kerja (weekday) sebesar  Rp. 7.000,00,- dan (wekkend) sebesar Rp. 2.333,33,-. Pemerintah perlu mengeluarkan kebijakan agar load factor angkutan umum meningkat sehingga operator angkutan dapat meningkatkan kenyamanan angkutannya yang dapat  mempengaruhi kemauan mambayar penumpang.

Beton Self Compacting Concrete (SCC) merupakan salah satu hasil inovasi dari teknologi beton saat ini. Namun diperlukan suatu analisis untuk mengetahui perbandingan penggunaan beton SCC dengan beton konvensional. Tujuan penelitian ini adalah untuk mengetahui seberapa besar perbandingan penggunaan beton SCC dengan beton konvensional pada struktur beton bertulang proyek Nestle Batik Project, Batang, Jawa Tengah, baik dalam segi biaya, metode pelaksanaan dan waktu pelaksanaan. Objek dalam penelitian ini adalah pembangunan bangunan Waste Water Treatment Plant (WWTP), Water Tank dan Wastewater Sumpit. Hasil perbandingan menunjukkan biaya penggunaan material beton SCC secara menyeluruh sebesar Rp 1.923.818.616, beton SCC sebagian sebesar Rp1.704.741.804 dan beton konvensional menyeluruh sebesar Rp 1.270.073.150. Sifat beton SCC yang dapat mengalir dengan sendirinya, metode pelaksanaan beton SCC tidak membutuhkan concrete vibrator dan pelaksanaan pengecoran yang cepat sehingga akan mengurangi resiko segregasi, keropos, bleeding pada struktur beton bertulang, mempermudah pekerjaan dan mempercepat waktu pekerjaan. Perbandingan waktu menggunakan beton SCC baik secara menyeluruh atau sebagian akan mempercepat waktu pekerjaan 21 hari dibandingkan penggunaan beton konvensional.