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Waste Water Treatment Plant (WWTP), Alur Proses Pengolahan Limbah PLTU

Sains, Teknologi dan Ekonomi Bisnis    Tuesday, August 11, 2015

Waste Water Treatmnet Plant (WWTP) adalah sistem pengolahan limbah dari pembangkit yang berupa cairan sisa bekas seperti cairan bekas operasi dari gas turbine sump pit, desalination plant, HRSG sump pit, WTP, chemical storage yard pit dan condensate pit dialirkan menuju ke waste water storage pond untuk penampungan dan treatment pertama, disini limbah cair di aerasi oleh waste water storage pond blower yang fungsinya menghembuskan udara ke bawah penampungan untuk kebutuhan O2 mikroorganisme pen-degradasi limbah. Kemudian limbah cair dipompa oleh waste water storage pond pump ke treatment berikutnya yaitu di neutralizing pit 1 yang fungsinya menyempurnakan proses peralatan sebelumnya. Limbah cair dipompa oleh neutralizing pit pump menuju ke pH control  & cxidation pit supaya treatment lebih sempurna. Disini cairan limbah dikontrol pH-nya dengan penambahan HCl dan NaOH serta agar cairan limbah dan pH control homogen diaduk dengan agitator. Sedangkan untuk membantu mempercepat pengendapan, ditambahkan zat kimia berupa coagulant dan coagulant aid (flocculant) yang umumnya berupa PAC dan FeCl3. Hasilnya di overflow kan menuju ke coagulation and sedimentation tank yang disertai pengadukan lambat untuk mempercepat pengendapan. Dari sini terdapat 2 produk yaitu yang overflow lewat atas hampir murni cairan dialirkan menuju ke clear water pit sedangkan yang berupa padatan (sludge) dipompa oleh cagulation and sedimentation sludge pump menuju ke sludge enrichment tank, disini juga disertai pengadukan untuk menyempurnakan proses pembentukan gumpalan. Hasilnya ada 2 yaitu yang berupa cairan di bagian atas di overflow kan ke neutralizing pit 2 dan yang berupa padatan bagian bawah dipompa oleh sludge enrichment pump menuju ke sludge storage pond. Sebagian sludge dipompa oleh sludge storage pond sischarge pump menuju ke neutralizing pit 1 untuk proses penyempurnaan treatment. Hasil overflow dari coagulation and sedimentation tank yang menuju ke clear water pit untuk treatment lagi dan untuk pembersihan dipompa oleh clear water pit pump menuju ke filter tank yang berisi activated carbon dan media filter (pasir, batu, kerikil dll). Hasil keluaran dipompa dengan filter tank pump menuju ke neutralizing pit 2 yang mengalami treatment seperti penambahan injeksi kimia NaOH dan HCl untuk kontrol pH. keluaran yang jelek dikembalikan lagi ke waste water storage pond sedangkan keluaran yang bagus dipompa oleh neutralizing pit pump menuju ke purified waste water pit yang siap dibuang ke laut. 


Dozing Tank Injection untuk WTP dan WWTP

WWTP System PLTU BL
“WWTP is waste water treatment system from power plant in the form of residual liquid likes Gas Turbine Sump Pit, Desalination Plant, HRSG Sump Pit, WTP, Chemical Storage Yard Pit and Condensate Pit here liquid waste water is done aeration by Waste Water Storage Pond Blower that function to blowing air into bottom container for necessity O2 microorganism to degrade waste water. Then liquid waste water is pumped by Waste Water Storage Pond Pump into next treatment namely Neutralizing Pit 1 that function to complete previous process equipment. Liquid waste water is pumped by Neutralizing Pit Pump to the pH Control  & Oxidation Pit so that treatment is more complete. Here liquid waste water is controlled pH with adding HCl and NaOH also for homogeneous liquid waste water and pH Control done stirred with agitator. Whereas  to help accelerate the deposition, added chemical such as Coagulant and Coagulant Aid (Flocculant) commonly PAC and FeCl3. The result then overflow to the Coagulation and Sedimentation Tank that slow stirring to accelerate the deposition. From here, there are 2 products such as upper overflow and almost pure liquid is transported into Clear Water Pit and sludge is pumped by Coagulation and Sedimentation Sludge Pump into Sludge Enrichment Tank, here also accompanied stirring to complete deposition process. The result there are 2 products such as liquid in the upper layer is done overflow into Netralizing Pit 2 and sludge in the bottom is pumped by Sludge Storage Pond Discharge Pump to the Neutralizing Pit 1 to complete process. The result overflow from Coagulation and Sedimentation Tank to the Clear Water Pit for again treatment and to clean is pumped by Clear Water Pit Pump into Filter Tank that contain Activated Carbon and Media Filter (sand, stone and small rocks etc). The out product is pumped with Filter Tank Pump into Netralizing Pit 2 that doing treatment likes addition chemical injection NaOH and HCl to pH control, Bad product is returned again into Waste Water Storage Pond and good product is pumped by Netralizing Pit Pump to the Purified Waste Water Pit and ready to be discardes to into the sea. 

Kutip Artikel ini Sebagai Referensi (Citation):
Feriyanto, Y.E. (2015). Waste Water Treatment Plant (WWTP), Alur Proses Pengolahan Limbah PLTU, Best Practice Experience in Power Plant. www.caesarvery.com. Surabaya

Referensi:
[1] Feriyanto, Y.E. (2015). Best Practice Experience in Power Plant. Surabaya

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