Dewasa kini, industri binaan bangunan semakin hari semakin pesat membangun. Namun, dalam keghairahan mengejar kemajuan pembangunan, pada masa yang sama hal ini menyumbangkan impak yang besar kepada alam sekitar. Ini disebabkan oleh peningkatan pembuangan sisa bahan binaan di merata tempat oleh pihak yang tidak bertanggungjawab. Kebanyakan sisa buangan binaan ini adalah terdiri daripada serpihan bata merah dan konkrit. Sebagai langkah penyelesaian, kaedah kitar semula adalah salah satu cara yang terbaik bagi menangani masalah ini. Dari sudut kejuruteraan air, adalah lebih baik sekiranya bahan buangan binaan ini digunakan sebagai bahan pengetal dalam salah satu cara pengolahan yang digunakan dalam rawatan air. Tambahan pula, bahan pengetal yang didapati di pasaran terdiri daripada bahan kimia yang berupaya memberi kesan buruk kepada kualiti alam sekitar dan kebanyakannya berkos tinggi. Keupayaan bata merah dan konkrit dalam pengurangan COD, pepjal terampai dan kekeruhan diambilkira melalui kajian. Dos optima dan pH juga dikenalpasti selain daripada SVI. Melalui keputusan yang didapati, bata merah adalah lebih optimum berbanding konkrit di mana berupaya mengurangkan 91.98% COD. Daripada efisyensi pengurangan berdasarkan semua yang optimum didapati bahawa bata merah berupaya mengurangkan 79.45% pepejal terampai dan 75.45% kekeruhan. Bagi nilai SVI pula, serpihan bata merah adalah rendah sedikit berbanding dengan alum. Secara keseluruhannya, serpihan bata mahupun konkrit dapat bertindak balas dengan baik sebagai bahan pengetal tanpa memerlukan kombinasi daripada keduanya.
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Nowadays, industries of building construction become rapidly higher from day to days. This situation mostly contributes big impact to the environment. This is because, the construction building disposal was increased and have discarded everywhere which from the person who not responsible. Mostly, this construction disposal consist crushed red bricks and concrete. As the precaution or to reduce the disposal, recycle is one of the ways to overcome. Looking from side of water engineering, this is a good step if the construction disposal such as red bricks and concrete is use as coagulant material which is the one of the purification alternatives applicable for wastewater. In addition, the conventional coagulants that are commercialized at the market mostly base on chemical material and able to give bad effect to the environmental quality and most of that was expensive. In this study, crushed red bricks and concrete was able to remove COD, suspended solids and turbidity. The optimum conditions like pH and coagulant dosage were identified as well as Sludge Volume Index (SVI). From the result, crushed red bricks gave optimum result better than concrete which showed removal 91.98% COD. From the efficiency removal based on all optimum, indicates that crushed red bricks able to remove 79.45% suspended solids and 75.45% turbidity. Besides that, SVI value for crushed red bricks is slightly less compare to alum. Totally, both this two material either crushed red bricks or concrete able to react by itself no need the combination from it and this material also suitable as coagulant to use to improve the quality of the water.
The use of crushed red bricks and concrete as coagulant for wastewater treatment_Sharifah Farah Fariza Syed Zainal_A9_2011_NI