threads either by hand or machine. lace may be made of any fiber—silk, linen, cotton, polyester, rayon, etc. most hand-made laces today are made from linen, cotton, or silk. machine-made laces are most frequently made from polyester (which performs well on industrial lace machines), cotton, or a combination...
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ph, temperature, waste loading, absence of oxygen and toxic materials. some of the commonly used biological treatment processes are described below: aerated lagoons: these are large holding tanks or ponds having a depth of - m and are lined with cement, polyethylene or rubber. the effluents from primary...