科研之友
微信
新浪微博
Facebook
分享链接
摘要
Natural waste materials have potential as inexpensive sorbents for organic loads removal from wastewater. Some agriculture by-products and industrial wastes were used as good sorbent agents. Recycling of these waste materials as useful products has become a main solution to waste disposal problems. Thus, this work was devoted to study the utilization of the agricultural by-products (rice straw) and industrial wastes (kiln dust and chrome shavings) as sorbent agents for organic loads removal from wastewater. Cement kiln dust was used as a primary treatment step followed by rice straw or chrome shavings column as a secondary treatment step. The results indicated that chemical oxygen demand (COD), biological oxygen demand (BOD) and total suspended solids (TSS) were decreased from 471.3, 317.5, and 180.6 to 160.5, 85.1, and 48.5 mg/l with percentage removal of 66, 73.2, and 73%, respectively, with 1.5 g/l cement kiln dust. On the other hand, faecal coliform (FC) counts were reduced from 6.1 x 10(7) to 1.1 x 10(6) MPN/100 ml with only one log unit removal. The primary treated effluent still contains considerable organic and bacterial loads. The levels of COD, BOD, and TSS were reduced by 62.1, 69, and 85% for rice straw and 64.5, 71.4, and 85% of cement kiln dust, respectively. The corresponding concentrations were 60.8, 26, and 7.2 mg/l for rice straw and 57, 24.3, and 7.2 mg/l for cement kiln dust, respectively. FC counts were reduced by two log units. The results indicated that cement kiln dust, rice straw, and chrome shavings may be used as low-cost materials for wastewater treatment. Disinfection step should be used for reducing the bacterial load in the treated wastewater to be used safely.
- 出版日期2015-5-29
