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Chlorophyll a response of Spirulina platensis to intermittent CO₂ feeding in a hybrid photobioreactor Geraldi Rahanra; Awalina Satya; Ika Atman Satya
Jurnal Rekayasa Proses Vol 0 No 0.1 (3000): ONLINE FIRST
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.28633

Abstract

Chlorophyll a production during microalgae cultivation is strongly influenced by photobioreactor operating conditions. This study aimed to analyze the effects of intermittent CO₂ feeding and light intensity on chlorophyll a content of Spirulina platensis cultivated in a hybrid flat panel–bubble column photobioreactor (FCB). Cultivation was conducted at light intensities of 100, 200, and 300 µmol/(m²·s), with CO₂ concentrations of 8%, 12%, and 15% (v/v) supplied intermittently for 3 hours per day. Chlorophyll a production was evaluated based on chlorophyll a concentration and productivity. The results showed that chlorophyll a production was strongly influenced by the combined effects of CO₂ feeding concentration and light intensity applied to the culture. At irradiance levels of 100–200 µmol/(m²·s), chlorophyll a accumulation and productivity significantly increased with increasing CO₂ concentration. In contrast, at high irradiance (300 µmol/(m².s)), chlorophyll a production remained constant across all CO₂ treatments, indicating pigment saturation and that photosynthesis was mainly affected by light intensity. Chlorophyll a production increased with biomass growth, while chlorophyll a content per biomass decreased. Overall, chlorophyll a production of Spirulina platensis was strongly influenced by the interaction between intermittent CO₂ feeding concentration and light intensity.
PENYISIHAN NUTRIEN DENGAN KULTUR Eichornia Crassipes DALAM AIR LIMBAH KOLAM IKAN RESIRKULASI SEMI TERTUTUP Awalina Satya; Tjandra Chrismadha; Fachmijany Sulawesty; Gunawan P. Yoga; Yayah Mardiyati
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 21 No. 2 (2014)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2014.13284

Abstract

Air Limbah kolam ikan resirkulasi memiliki karakteristik yang mirip dengan perairan eutrofik sehingga tidak aman untuk dibuang ke perairan umum secara langsung. Pada penelitian ini dilakukan evaluasi kemampuan tiga variasi kepadatan eceng gondok (Eichornia crassipes) untuk memperbaiki kualitas air limbah kolam ikan resirkulasi tersebut. Tujuan penelitian adalah untuk 1) mengungkapkan dinamika kualitas air dalam “batch culture†2) kinetika laju reduksi nutrien nitrogenik-fosforik dan konstituen pencemar lainnya, dan 3) efektifitas penyisihan nutrien. Eksperimen terdiri atas empat bak plastik, B1, B2, B3 dan B4. Bak B1 merupakan kontrol, hanya berisi air limbah tanpa eceng gondok. Bak B2, B3 dan B4 berisi eceng gondok dengan kepadatan awalnya berturut-turut adalah 1.618,40 gram/m2; 2.436,51 gram/m2 ; dan 3.243,93 gram/m2. Percobaan dilakukan selama empat hari. Pengukuran pH,Oksigen terlarut (Dissolved Oxygen,DO), konduktifitas, suhu, Total Dissolved Solid (TDS), dan % DO saturation dilakukan tiga kali sehari pada jam 09.00-09.30 ; 12.00-12.30 dan 16.00-16.30, sedangkan Senyawa nutrien nitrogenik (N-NH3+; N-NO2-; N-NO3-, Total Nitrogen (TN)), fosfor (TP), Total Suspended Solid (TSS) dan Total Organic Matter (TOM) dianalisis dua kali sehari pada pagi dan sore hari. Reduksi parameter konduktifitas,TDS, nutrien, nitrogenik, dan fosforik dalam bak-bak yang ditumbuhi eceng gondok mengikuti model kinetika order pertama. Kepadatan eceng gondok ideal adalah 2.436,51 gram/m2 (bak B3) karena menghasilkan pertambahan densitas yang paling tinggi (147,13 gram/m2). Bak berisi eceng gondok paling efektif menyisihkan turbiditas (94,28%-100%), N-nitrit (98,21%-98,93%), TP (92,86%-93,62%), N-nitrat (58,33%-83,33%), TN (59,46%-66,06%), N-ammonia (18.82%-46,88%) dan konduktifitas (16,34%-23,54%). Seluruh perlakuan dan kontrol terbukti tidak efektif untuk menyisihkan material organik.