Recovery Koagulan dari Sludge WWTP Pembangkit Listrik Tenaga Uap sebagai Alternatif Pengolahan Air Limbah secara Kimia

Adhi Setiawan, Ahmad Erlan Afiuddin, Qurrotul Aini, Tanti Utami Dewi


Proses koagulasi di wastewater treatment plant (WWTP) menghasilkan produk samping berupa limbah lumpur atau sludge dalam jumlah besar serta belum dimanfaatkan secara optimal. Penelitian ini bertujuan untuk melakukan karakterisasi terhadap sludge, menganalisis pengaruh konsentrasi asam klorida pada proses recoveri koagulan, serta menganalisis pengaruh dosis koagulan hasil recovery sludge terhadap removal TSS, Zn, dan Fe. Metode karakterisasi sludge menggunakan SEM-EDX, XRD, dan FTIR. Proses recovery koagulan menggunakan metode pengasaman dengan menggunakan HCl pada konsentrasi 1 N hingga 3 N. Hasil penelitian menunjukkan bahwa sludge memilki kandungan Fe sebesar 69,29% wt dalam bentuk Fe(OH)3 dan Fe2O3. Konsentrasi pengasaman dengan HCl 3N menghasilkan SRP dengan kandungan koagulan Fe yang tertinggi yakni sebesar 52,3 mg/L.  Hasil jar tes menunjukkan bahwa penambahan SRP 3 N pada dosis 10 mL/L menghasilkan konsentrasi residual TSS dan Zn paling rendah yakni sebesar 34 mg/L dan 0,01 mg/L.  Besarnya persen removal TSS dan Zn pada SRP 3N dengan dosis 10 mL/L masing-masing sebesar 79,4% dan 9,52%. Namun, removal Fe tertinggi pada SRP 1 N dengan dosis 4 mL/L. Jenis dan dosis SRP yang direkomendasikan untuk menurunkan TSS, Fe, dan Zn antara lain SRP 1 N dengan semua  dosis  yaitu  4  mL/L,  6  mL/L,  8  mL/L,  10 mL/L, serta SRP 1,5 N dan SRP 2 N dengan dosis 4 mL/L.


koagulasi, koagulan, recovery lumpur, pengasaman

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