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Reri Afrianita
Laboratorium Air Jurusan Teknik Lingkungan Universitas Andalas
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The Effect of Cone Area Variations on the Continuous Discharges Flow (CDF) Method Sedimentation Unit as a New Method for Raw Water Turbidity Removal Ridwan Ridwan; Reri Afrianita; Aulia Massyaf Putri; Reski Anggika
Jurnal Ilmu Lingkungan Vol 21, No 3 (2023): July 2023
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.21.3.659-666

Abstract

The Sedimentation Unit Continuous Discharges Flow (CDF) method is a modification by adding a continuous and controlled discharge flow as a net force acting on the particles to increase the efficiency of turbidity removal by applying the principle of a leaky tank at the bottom of the settling zone. The production capacity of the sedimentation unit using the CDF method is reduced due to the CDF flow of 6% of the flow rate so it needs to be recirculated. This study aims to maintain the production flow rate of the system and increase the efficiency of turbidity removal by recirculating the CDF flow. The research reactor consisted of a coagulation unit, flocculation unit, and sedimentation method using 6% CDF with a flow rate of 240 L/hour and 360 L/hour, and variations in the recirculation flow of 6% CDF to the flocculation unit were 0%, 25%, 50%, 75%, and 100 %. The sedimentation detention time at a flow rate of 240 L/hour and 360 L/hour was 90 minutes and 60 minutes, respectively. Research on a laboratory scale with raw water turbidity of 25,536 NTU. The results showed that the greater the CDF flow recirculation value, the higher the turbidity removal efficiency. Rank Spearman analysis, the correlation value of the CDF flow recirculation value to the efficiency of removal of turbidity is 0.980 and the significance value is 0.00 which means strong and significant. The highest turbidity removal efficiency was achieved at the 100% CDF flow recirculation value, ie at 240 L/hour flow rate was 87.21% with final turbidity 3.267 NTU, while at 360 L/hour flow rate was 82.50% with final turbidity 4,528 NTU. Uprating the flow rate in the experiment was able to produce a final turbidity value that met the drinking water quality standard, which was 5 NTU
Potensi Uprating pada Unit Sedimentasi Metode Continuous Discharges Flow terhadap Penyisihan Kekeruhan Air Baku Ridwan Ridwan; Reri Afrianita; Rifka Indriani
Jurnal Serambi Engineering Vol 7, No 4 (2022): Oktober 2022
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v7i4.4731

Abstract

Unit Sedimentasi Continuous Discharges Flow (CDF) adalah modifikasi dengan menambahkan aliran buangan secara kontinu dan terkendali sebagai gaya baru yang bekerja terhadap partikel flok guna meningkatkan efisiensi penyisihan kekeruhan. Pengurangan produksi akibat aliran buangan sebesar 6% terhadap debit produksi unit sedimentasi perlu diresirkulasi. Penelitian bertujuan meningkatkan debit produksi dan efisiensi penyisihan kekeruhan dengan resirkulasi aliran buangan CDF. Percobaan dilakukan dalam skala laboratorium dengan nilai kekeruhan air baku 25,536 NTU. Rangkaian alat yang digunakan unit koagulasi flokulasi, unit sedimentasi metode CDF 6% dengan variasi produksi 240 L/jam dan 360 L/jam, serta variasi resirkulasi aliran buangan CDF 6% ke inlet flokulasi adalah 0%, 25%, 50%, 75% dan 100%. Waktu tinggal unit sedimentasi debit 240 L/jam dan 360 L/jam secara berurutan yaitu 90 menit dan 60 menit. Hasil percobaan menjelaskan bahwa resirkulasi aliran buangan CDF yang semakin besar dapat meningkatkan efisiensi penyisihan kekeruhan dan itu terlihat dari parameter analisis Rank Spearman dengan nilai korelasi dari nilai resirkulasi aliran buangan CDF terhadap efisiensi penyisihan kekeruhan adalah 0,980 dan nilai signifikansi 0,00 yang berarti kuat dan signifikan. Efisiensi penyisihan kekeruhan maksimum pada debit 240 L/jam mencapai 87,21% dan debit 360 L/jam adalah 82,50% dengan nilai resirkulasi aliran buangan CDF 100% dan memiliki potensi uprating sistem.
Potensi Hilirisasi Instalasi Pengolahan Air dengan Unit Sedimentasi Metode Continous Discharges Flow Ridwan Ridwan; Reri Afrianita; Reski Anggika; Fajri Dwi Arya
Jurnal Ilmu Lingkungan Vol 22, No 6 (2024): November 2024
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.22.6.1537-1544

Abstract

Inovasi teknologi pengolahan air yang menjamin tercapainya kualitas baku mutu air minum sangat dibutuhkan guna keberlanjutan peningkatan layanan sistem penyediaan air minum sebuah kota. Penelitian ini bertujuan mengembangkan instalasi pengolahan air menggunakan bak sedimentasi dengan continuous discharges flow method (CDF) yang merupakan inovasi baru dalam menyisihkan kekeruhan air. Teknologi pengolahan air dirancang pada kapasitas desain 240 L/Jam dengan rangkaian proses koagulasi berupa terjunan air, proses flokulasi dengan sistem sekat sebanyak 6 kompartemen, bak sedimentasi metode CDF dengan variasi nilai CDF 10%, 11%, 12%, dan 13% dari kapasitas inlet, besaran resirkulasi aliran buang CDF 100% ke proses flokulasi, perbandingan luas cone terhadap luas permukaan bak sedimentasi adalah 13%, dan ketinggian cone dari dasar zona pengendapan sebesar 66%, dan unit filtrasi dengan media pasir kuarsa. Penelitian dilakukan dua kali pengulangan dengan kekeruhan air baku artifisial 115,686 NTU. Hasil penelitian menunjukkan efisiensi penyisihan parameter kekeruhan rata-rata pada unit sedimentasi dengan metode CDF pada variasi nilai CDF 10%, 11%, 12%, dan 13% secara berturut adalah 94,00%, 94,84%, 95,51% dan 96,28% dengan nilai kekeruhan secara berturut adalah 6,936 NTU, 5,967 NTU, 5,192 NTU dan 4,302 NTU. Semakin besar nilai CDF, maka semakin besar efisiensi penyisihan kekeruhan. Efisiensi penyisihan kekeruhan rata-rata secara keseluruhan teknologi pengolahan air dengan unit sedimentasi metode CDF pada variasi nilai CDF 10%, 11%, 12%, dan 13% secara berturut adalah 97,86%, 98,17%, 98,70% dan 98,75% dan nilai kekeruhan akhir hasil pengolahan secara berturut adalah 2,613 NTU, 1,997 NTU, 1,531 NTU dan 1,290 NTU yang memenuhi baku mutu air minum, yaitu kurang dari 5 NTU dan memiliki potensi untuk dihilirisasi dalam skala lapangan.
A Modification of the Sedimentation Unit with Continuous Discharges Flow (CDF) as a New Method to Increase Turbidity Removal in Raw Water Ridwan, Ridwan; Afrianita, Reri; Kurniawan, Yogi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 1 No. 1 (2021): July 2021
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v1i1.6

Abstract

This study applies a new method to remove the turbidity of raw water in the sedimentation unit called CDF sedimentation using the working principle of a leaky tank at the bottom of the tank. The test was carried out on a laboratory scale reactor of 240 L/hour for 6 hours consisting of a waterfall coagulation unit for 5 seconds and alum as a coagulant. perforated wall flocculation unit with 30 minutes detention time and 1 hour CDF sedimentation unit. The study was conducted with 4 variations of CDF, namely 0%, 1%, 3%, and 5% with turbidity of 75.25 NTU. The results showed the greater the CDF value, the greater the decrease in turbidity that occurred. The highest level of turbidity removal occurred at 5% CDF value with an efficiency of 91,09%, a correlation value -0,927, and a significance value of 0,00 < 0,05. CDF value gives an influence on Reynolds numbers and Froude numbers in sedimentation units where Reynolds numbers are in the range 65,71-76,75 and Froude numbers 1,96x10-4-2,29x10-4. This shows the Reynolds number and the Froude number will get bigger as the value of the CDF and still matches the design criteria of the laminar. Keywords: The CDF sedimentation, Efficiency, and Turbidity.
The Effect of Coagulants Variations in the Coagulation Unit on the Efficiency of Raw Water Turbidity Removal Sedimentation Unit Continuous Discharges Flow (CDF) as a New Method Ridwan, Ridwan; Afrianita, Reri; Danir, Resi Meilinta Danir
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 1 No. 02 (2021): November 2021
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v1i02.17

Abstract

Variations in the type of coagulant resulted in different floc characteristics. The sedimentation unit with continuous discharges flow or (CDF) method is a sedimentation unit that applies the leaking tank phenomenon, so it is possible that it will affect the condition of the floc that has been formed and in the end can affect the efficiency of turbidity removal. This study was to determine the effect of the type of coagulant in the coagulation unit on the removal of raw water turbidity in the sedimentation unit using the CDF method with a 6% discharge ratio to the product discharge. The raw water used is Sungai Batang Kuranji water with a turbidity of 27.63 NTU. The experimental reactor consisted of a coagulation-flocculation unit and a sedimentation unit with various coagulants being Poly Aluminum Chloride (PAC), Ferric Chloride, and Alum. The results showed that the efficiency of removing turbidity from the Sungai Batang Kuranji by PAC coagulant was 90.12%, Ferric Chloride 86.99%, and Alum 81.72%. The Spearman correlation value of the coagulant variable on the efficiency of the removal of turbidity is 0.948, indicating a unidirectional effect between the two variables. The addition of 6% CDF flow in the settling zone did not break the floc because the flow formed was still laminar.
The Study of Raw Water Turbidity Removal in Sedimentation Unit Continuous Discharges Flow (CDF) Method Using Plate Settlers Ridwan, Ridwan; Afrianita, Reri; Hadi, Refa Nabila
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 2 No. 3 (2022): November 2022
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v2i03.38

Abstract

The sedimentation unit using the continuous discharges flow (CDF) method can remove raw water turbidity of 91.09% with initial turbidity of 75.248 NTU. The performance of the sedimentation unit using the CDF method needs to be tested at high turbidity, which is more than 100 NTU. Sedimentation using the CDF method with the addition of plate settlers is an alternative that can be done by increasing the turbidity value. This study aims to determine the performance of the sedimentation unit using the CDF method with the addition of plate settlers in the removal of high turbidity. The study used a laboratory-scale reactor of 240 L/hour, with units consisting of plunge coagulation, baffle channel flocculation and a 5% CDF method sedimentation unit with plate settlers. The study used artificial raw water with variations in turbidity of 110.355 NTU, 132.035 NTU, and 153.338 NTU. The research shows that the efficiency of removal of turbidity on average for the variation of turbidity is 92.32%, 91.25%, and 89.87%, respectively. The correlation value and significance of Rank Spearmen from the variation of turbidity to reactor performance are -0.926 and 0.00, respectively. In other words, the more turbid the raw water, the lower the reactor performance
PRELIMINARY DESIGN SISTEM PENYEDIAAN AIR BERSIH PADA KAMPUNG TEMATIK IKAN HIAS DI KAMPUNG SARASAH KECAMATAN BUNGUS TELUK KABUNG KOTA PADANG: Preliminary Design Sistem Penyediaan Air Minum (SPAM) Kampung Tematik Ikan Hias Kampung Sarasah Kelurahan Bungus Timur kota Padang Ridwan Ridwan; Vera Surtia Bachtiar; Reri Afrianita; Yega Serlina
BULETIN ILMIAH NAGARI MEMBANGUN Vol. 6 No. 3 (2023)
Publisher : LPPM (Institute for Research and Community Services) Universitas Andalas Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/bina.v6i3.489

Abstract

Kampung Sarasah, as a thematic village, has had economic potential in the form of freshwater ornamental fish farming activities since 2020. The unavailability of a clean water supply system is one of the hindering factors for the growth and development of the area. Therefore, a preliminary study is needed for the provision of clean water supply in the area in the form of a preliminary design. This activity aims to provide a description and socialization of the technical plan for clean water supply in Kampung Sarasah, Padang City. The Preliminary design of the clean water supply system is carried out in Kampung Sarasah, Bungus Timur Village, Bungus Teluk Kabung Sub-District, Padang City. The preliminary design of the clean water supply system in Kampung Sarasah is conducted in several key stages, including a survey of the community's conditions and mapping of the Kampung Sarasah area, observation, socialization, and field measurements using Global Positioning System (GPS) equipment and the utilization of Google Earth application for selecting the route of transmission and distribution pipes for the clean water supply system plan. The capacity of the clean water treatment installation in the Kampung Sarasah area is 1.0 L/second, consisting of coagulation-flocculation unit, sedimentation unit, filtration unit, and disinfection unit. The capacity of the main distribution pipe network in the area is 1.2 L/second, using 2-inch HDPE pipes with a length of approximately 1.7 km. The estimated cost of the Sarasah Thematic Village Clean Water Supply System, based on community empowerment and excluding the procurement and construction of Water Treatment Plant and 15 m³ Reservoir, is Rp. 144,050,400. Following the preliminary design of the Sarasah Thematic Village Clean Water Supply System, it is recommended to proceed with detailed engineering design to support the smooth development of the system.
Sistem Pengatur Tegangan Otomatis : Analisa Peralihan Dengan Pengendali Tunggal Dan Kaskade Laksono, Heru Dibyo; Novizon, Novizon; Latif, Melda; Gunawan, Eko Amri; Afrianita, Reri
JURNAL AMPLIFIER : JURNAL ILMIAH BIDANG TEKNIK ELEKTRO DAN KOMPUTER Vol. 11 No. 2 (2021): Amplifier November Vol. 11, No. 2 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jamplifier.v11i2.19133

Abstract

This journal describes the design and analysis of the response of a single controller and cascade direct current type of Automatic Voltage Regulator (AVR) system. The direct current AVR system is represented form of a transfer function. For single and cascade controllers, it is designed using a parallel architecture using MATLAB software with predetermined design criteria. The types of controllers used consist of Proportional Differential (PD), Proportional Integral (PI), Proportional Integral Differential (PID), Proportional Differential with First Order Filters in the Differential Section (PDF) and Proportional Integral Differentials with First Order Filters in the Differential Section(PIDF). For the transition analysis, the observed parameters consist of rise time, peak time, steady state time, maximum pass value and peak value. The results of the analysis show that the controllers that meet the design criteria are Proportional Differential (PD) controllers and Proportional Differential controllers with First Order Filters in Differential Sections (PDF) for single controllers and cascade controllers. For a single controller, the value of the Proportional constant (Kp) is 0.6280 and the value of the Differential constant (KD) is 0.1710 for the Proportional Differential (PD) controller. Proportional constant value (Kp) is 0.6130, Differential constant value (KD) is 0.1710 and filter constant value (Tf) is 0.0009 for Proportional Differential controller with First Order Filter in Differential Section (PDF). Cascade controllers and Proportional Differential (PD) controllers, the Proportional constant (Kp) is 1.7300 and the Differential constant (KD) is 0.0242 for the inner circle (C2). Outer ring controller (C1), the proportional constant (Kp) is 179,000 and the Differential constant (KD) is 2.4600. Cascade controllers and Proportional Differential controller types with First Order Filters in the Differential Section (PDF), the Proportional constant (Kp) value is 1.5900, the Differential constant (KD) value is 0.0246, the filter constant value (Tf) is 0.0018 for the inner circumference (C2 ). For the outer ring controller (C1), the Proportional constant (Kp) value is 134,0000, the Differential constant (KD) value is 2.2900 and the filter constant value (Tf) is 0.00008.
The Effect of Coagulants Variations in the Coagulation Unit on the Efficiency of Raw Water Turbidity Removal Sedimentation Unit Continuous Discharges Flow (CDF) as a New Method Ridwan, Ridwan; Afrianita, Reri; Danir, Resi Meilinta Danir
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 1 No. 2 (2021): November 2021
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v1i02.17

Abstract

Variations in the type of coagulant resulted in different floc characteristics. The sedimentation unit with continuous discharges flow or (CDF) method is a sedimentation unit that applies the leaking tank phenomenon, so it is possible that it will affect the condition of the floc that has been formed and in the end can affect the efficiency of turbidity removal. This study was to determine the effect of the type of coagulant in the coagulation unit on the removal of raw water turbidity in the sedimentation unit using the CDF method with a 6% discharge ratio to the product discharge. The raw water used is Sungai Batang Kuranji water with a turbidity of 27.63 NTU. The experimental reactor consisted of a coagulation-flocculation unit and a sedimentation unit with various coagulants being Poly Aluminum Chloride (PAC), Ferric Chloride, and Alum. The results showed that the efficiency of removing turbidity from the Sungai Batang Kuranji by PAC coagulant was 90.12%, Ferric Chloride 86.99%, and Alum 81.72%. The Spearman correlation value of the coagulant variable on the efficiency of the removal of turbidity is 0.948, indicating a unidirectional effect between the two variables. The addition of 6% CDF flow in the settling zone did not break the floc because the flow formed was still laminar.
A Modification of the Sedimentation Unit with Continuous Discharges Flow (CDF) as a New Method to Increase Turbidity Removal in Raw Water Ridwan, Ridwan; Afrianita, Reri; Kurniawan, Yogi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 1 No. 1 (2021): July 2021
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v1i1.6

Abstract

This study applies a new method to remove the turbidity of raw water in the sedimentation unit called CDF sedimentation using the working principle of a leaky tank at the bottom of the tank. The test was carried out on a laboratory scale reactor of 240 L/hour for 6 hours consisting of a waterfall coagulation unit for 5 seconds and alum as a coagulant. perforated wall flocculation unit with 30 minutes detention time and 1 hour CDF sedimentation unit. The study was conducted with 4 variations of CDF, namely 0%, 1%, 3%, and 5% with turbidity of 75.25 NTU. The results showed the greater the CDF value, the greater the decrease in turbidity that occurred. The highest level of turbidity removal occurred at 5% CDF value with an efficiency of 91,09%, a correlation value -0,927, and a significance value of 0,00 < 0,05. CDF value gives an influence on Reynolds numbers and Froude numbers in sedimentation units where Reynolds numbers are in the range 65,71-76,75 and Froude numbers 1,96x10-4-2,29x10-4. This shows the Reynolds number and the Froude number will get bigger as the value of the CDF and still matches the design criteria of the laminar. Keywords: The CDF sedimentation, Efficiency, and Turbidity.
Co-Authors Amirul Luthfi, Amirul Aroiya Alawiyah Ary Zamzamy Asri Astia Ningsih Astri Astia Ningsih Aulia Massyaf Putri Danar Adi Laksono Danir, Resi Meilinta Danir Fajri Dwi Arya Gunawan, Eko Amri Hadi, Refa Nabila Hanalde Andre Laksono, Heru Dibyo Latif , Melda Melda Latif Mumuh Muharam Novizon, Novizon Pratama, Rizki Wahyu Putra, Ilham Hagi Reski Anggika Reski Anggika Ridwan Ridwan Ridwan Ridwan Ridwan, Ridwan Rifka Indriani Tivany Edwin Tomas, Micko Vera Surtia Bachtiar Yar Gustina Yega Serlina Yogi Kurniawan, Yogi Yommi Dewilda Zulkarnaini Zulkarnaini