Dissolved organic carbon of coal slurry transport water

The qualitative and quantitative occurrence and fate of dissolved organic carbon (DOC) leaching into coal slurry transport water was examined in laboratory-generated coal slurries and wastewaters from the Black Mesa coal slurry pipeline. Laboratory slurries were formulated for both western coals (Wyodak, Montana Rosebud and Black Mesa) and eastern coals (Illinois No. 6 and Pittsburgh No. 8). Sephadex G-25 elution profiles and ultrafiltration studies indicate that the majority of the organic compounds in western coal slurry wastewaters were lower (less than 1000) molecular weight species (62% for Wyodak and 74% for Montana Rosebud). Biochemical Oxygen Demand (BOD) for these particular wastewaters ranged from 50 to 150 mg l⁻¹ as determined through the use of an electrolytic respirometer. Also, there was a concomitant 51–74% reduction in the DOC levels in the wastewaters. This removal was primarily due to the removal of the lower (< 1000) molecular weight compounds by the seed inoculum. There was no evidence for the presence of mutagenic organics in the raw wastewater.     

含黑索今的混合炸药废水可处理性研究

对含黑索今的混合炸药废水的一般特性进行了分析,并用生物测试技术对其厌氧生物可降解性进行试验研究。结果表明,含黑索今的火炸药废水适宜于厌氧生物降解,其厌氧生化可降解性为89．9％;此废水的pH值符合厌氧反应器对进液的要求,但氮、磷营养缺乏,在厌氧废水处理中按CODBD：N：P=300～500：5：1的比例补充氮、磷,黑索今去除率可高达94％。     

Preliminary Results of the Anaerobic Biotreatability of the Effluent from the Wet-Air Oxidation of Sewage Sludge

Wet air oxidation and other thermal processes can be used on all sludges, whether they are raw, mixed or digested. The process sterilizes the sludge and gives a considerable reduction in volume. However, apart from the high capital costs which are associated with this technique, one of its principal disadvantages is the high strength of the (effluent) liquor.
This study investigated the feasibility of treating the liquor using an anaerobic digester, which resulted in a good reduction in BOD and a reasonable reduction in COD. The liquor was still strong, but could be returned to the inlet works of a sewage-treatment plant without causing significant organic overloading.