Mini Cooling Tower merupakan menara pendingin induced-draft aliran lawan arah yang berfungsi
menurunkan suhu air. Proses rancang bangun Mini Cooling Tower bertujuan untuk mengetahui
karakteristik Mini Cooling Tower sebagai fungsi perubahan suhu air melalui uji kelayakan Mini Cooling
Tower yang telah dirancang pada aliran air kondensor dalam proses refluks penetapan kadar Chemical
Oxygen Demand (COD) pada air limbah dan air sungai. Proses pembuatan Mini Cooling Tower dengan
cara merakit komponen yang terdiri dari boks aluminium berukuran 40x30x85cm, bak penampung
(akuarium) berukuran 40x28x30cm, kipas angin berdiameter 10 cm dan 8 cm masing-masing 2 buah, fill
yang berupa kelereng, pompa dengan kapasitas flow maksimal 800 l/h, thermometer air raksa 2 buah.
Hasil pengujian karakteristik Mini Cooling Tower menunjukan penurunan suhu (range) sebesar 8
o
C,
Approach sebesar 2
o
C dan efektivitasnya 80%. Uji kelayakan Mini Cooling Tower melalui penetapan
kadar COD pada air limbah menggunakan air kran 6400 mg/L, dengan Mini Cooling Tower rata-rata
6266,7 mg/L, dan bak penampung rata-rata 3466, mg/L. Sedangkan rata-rata hasil uji COD pada air
sungai yaitu 37,3 mg/L, 37,3 mg/L dan 24 mg/L. Hasil perbandingan kadar COD menggunakan uji
hipotesis (t-Test) menunjukan bahwa kadar COD menggunakan mini cooling tower tidak berbeda
signifikan dengan kadar COD menggunakan air kran
The study aims to compare the effectiveness of chromium removal from water using adsorption by coal fly ash (CFA) and phytoremediation by vetiver grass (Vetiveria zizanioides L) as well as a combination of both CFA and vetiver grass. The experiment was carried out in four different reactors, having size of 100 cm (length) x 60 cm (wide) x 80 cm (height). One reactor was filled with gravel and CFA, without vetiver grass (RI), while another one was filled with gravel and vetiver grass, without CFA (RIV). The other two reactors were filled with gravel, CFA, and vetiver grass with the mass ratio of gravel/CFA of (25:2) and (25:1), denoted as RII and RIII, respectively. Fifty (50) L of synthetic wastewater containing 14.612 ppm of chromium was filled into the reactors and continuously recirculated for 15 days. Chromium accumulation in CFA and plants was analyzed on day 15. The results of plant development are indicated by the presence of new shoots and roots that grow during phytoremediation processes. In addition, there was an increase in weight and number of vetiver stems indicating the persistency of vetiver grass in such a harsh wastewater condition. The removal of Cr from wastewater in RI, RII, RIII and RIV at days 15 were 81%, 93.2%, 85.8% and 75.7%, respectively. It can be concluded that: (1) vetiver grass (Vetiveria zizanioides L) has high potential as phytoremediator plant, (2) Chromium adsorption by CFA plays important role in Cr removal from wastewater, and (3) combination of adsorption by CFA and a phytoremediation by vetiver grass significantly increases the removal of chromium from wastewater.
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