2 Bab5.7 Sis Bekalan Air
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5.7 sistem bekalan air
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Pencemaran air
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Langkah penjimatan air• mandi dengan air pancuran.• jangan biarkan air terus mengalir semasa menggosok
gigi atau menyapu sabun pada badan.• basuh pinggan di dalam sinki yang diisi dengan air,
bukan dengan air yang mengalir dari pili air.• cuci kereta dengan menggunakan air di dalam baldi.• pasang tangki curahan air tandas dwisistem yang
menggunakan curahan separuh untuk urin dan curahan penuh untuk najis.
• gunakan mesin basuh dengan muatan penuh.• baiki pili air atau paip air yang bocor.• kumpulkan air hujan untuk menyiram pokok dan
tanaman
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Pencemaran air
Bahan buangan industri mengandungi sisa kimia atau sisa radioaktif yang boleh menjejaskan hidupan akuatik dan manusia yang makan hidupan tersebut.
Bahan buangan domestik terdiri daripada sampah sarap dan air kumbahan. Sisa bukan organik dan sampah sarap menghalang aliran air sungai. Takungan air akan menyebabkan pembiakan nyamuk.
Bahan kimia pertanian seperti baja kimia dan pestisid digunakan dengan meluas. Baja kimia mudah larut di dalam air dan mencemari sumber air. Penggunaan pestisid yang tidak terkawal juga boleh membunuh hidupan akuatik.
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Pengelodakan sungai berpunca daripada pembangunan dan penebangan hutan. Pembinaan jalan raya dan kawasan perumahan menyebabkan hakisan tanah dan menjadikan sungai tersumbat dan semakin cetek.
Tumpahan minyak dari kapal tangki minyak sering berlaku. Hal ini akan menjejaskan semua jenis hidupan akuatik dan burung di kawasan laut yang berkenaan.
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