Penggunaan Reaktor Continuous Stirred Tank untuk Recovery Fosfat dan Amonium Limbah Cair Industri Pupuk

Rachmadani, Nabila Putri (2021) Penggunaan Reaktor Continuous Stirred Tank untuk Recovery Fosfat dan Amonium Limbah Cair Industri Pupuk. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Limbah industri pupuk memiliki kandungan fosfat dan amonium tinggi, sehingga berpotensi untuk di-recovery. Pada penelitian ini akan digunakan pengolahan presipitasi struvite dengan tipe reaktor continuous stirred tank. CSTR dibuat lengkap dengan bagian presipitasi, pengendapan, dan kompaksi dalam satu reaktor. Penelitian ini bertujuan untuk mementukan kecepatan pengadukan optimum untuk menghasilkan struvite, mengkaji prediksi struvite yang dihasilkan menggunakan software PHREEQC, dan menentukan efektifitas CSTR untuk menurunkan konsentrasi fosfat dan amonium dalam limbah industri pupuk.
Penelitian diawali dengan pembuatan reaktor dan limbah sintentik yang karakteristiknya mengikuti penelitian terdahulu. Rasio molar [Mg2+]:[NH4+]:[PO43-] yaitu 1:1:1 dengan pH 8.5±0,2. Pada penelitian ini digunakan reaktor batch untuk menentukan kecepatan pengadukan optimum. Kemudian dilanjutkan menggunakan CSTR untuk mendapatkan efektifitasnya dalam menyisihkan fosfat. Parameter yang dianalisis yaitu pH, residual fosfat, dan turbiditas. Kemudian untuk data permodelan yang di-input pada PHREEQC yaitu berdasarkan konsentrasi pada sistem batch. Selanjutnya konsentrasi fosfat yang didapatkan pada percobaan CSTR dianalisis untuk didapatkan efektifitasnya apabila digunakan 2 reaktor secara seri berdasarkan kinetikanya.
Dari percobaan batch yang dilakukan, didapatkan kecepatan pengadukan yang optimum untuk menurunkan fosfat yaitu 207 rpm dengan persentase 72%. Kemudian dengan mengunakan CSTR selama 50 menit pengadukan, fosfat dapat diturunkan hingga 85%. Dari hasil permodelan, diprediksi mineral struvite terbentuk yang paling dominan pada percobaan batch. Selain mineral struvite, pada rentang pH 7,5–9 tanpa penambahan NaOH, diprediksi akan muncul fluorite, bobbierite dan newberyite. Dengan pH yang tetap, selain struvite diprediksi menghasilkan bobbierite dan fluorite. Berdasarkan hasil perhitungan secara kinetika reaksi, CSTR yang disusun secara seri dapat menurunkan fosfat dan amonium sebesar 85% pada reaktor pertama dan 75,3% pada reaktor kedua.
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High phosphate and ammonium in fertilizer industry potentially to be recovered. In this research, struvite precipitation is used using continuous stirred tank reactor (CSTR). CSTR is made complete with sections of precipitation, settling, and compaction in one reactor. The aims of this study are to determine the optimum stirring speed to produce struvite, predict of the resulting struvite using PHREEQC software, and determine the effectiveness of CSTR to reduce the concentration of phosphate and ammonium in fertilizer industrial waste.
The research begins with built up the reactors and prepare the synthetic waste with characteristics follow previous research. The molar ratio of [Mg2 +]:[NH4 +]:[PO43-] used 1: 1: 1 and pH constant in 8,5±0,2. In this study, a batch reactor was used to determine the optimum stirring speed. Then proceed to use CSTR to get its effectiveness in removing phosphate. The parameters analyzed during precipitation were pH, phosphate residual, and turbidity. Input data for PHREEQC modelling is based on the concentration in the batch system. Furthermore, the phosphate concentration obtained in the CSTR experiment was analyzed to obtain its effectiveness if 2 reactors were used in series based on their kinetics.
In the batch system, the optimum stirring speed to reduce phosphate was 207 rpm and remove 72% of phosphate. In the CSTR, after 50 minutes of mixing, the phosphate can be reduced up to 85%. From the modeling results, it is predicted that the most dominant crystal is struvite. In the pH range 7–9 without the addition of NaOH, it is also predicted that fluorite, bobbierite, and newberyite will formed. With a constant pH, besides struvite, it is predicted to produce bobbierite and fluorite. Based on kinetical reaction calculation, CSTR would remove phosphate and ammonium around 85% for first reactor and 75,3% for second reactor.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	amonium, continuously strirred tank reactor, fosfat, limbah industri pupuk, struvite.ammonium, continuously strirred tank reactor, fertilizer industry wastewater, phosphate, struvite
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD455 Chemical precipitation. Coagulation. Flocculation. Water--Purification--Flocculation. T Technology > TP Chemical technology > TP156 Crystallization. Extraction (Chemistry). Fermentation. Distillation. Emulsions.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Environmental Engineering > 25201-(S1) Undergraduate Thesis
Depositing User:	Nabila Putri Rachmadani
Date Deposited:	02 Mar 2021 07:17
Last Modified:	02 Mar 2021 07:19
URI:	http://repository.its.ac.id/id/eprint/82657

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