[Analysis of novel style biological fluidized bed A/O combined process in dyeing wastewater treatment].

A novel biological fluidized bed was designed and developed to deal with high-concentration refractory organic industrial wastewater. From 12 successful projects, three cases of dyeing wastewater treatment projects with the scale of 1200, 2000 and 13000 m3/d respectively were selected to analyze the principle of treating refractory organic wastewater with fluidized bed technology and discuss the superiority of self-developed biological fluidized bed from the aspects of technical and economic feasibility. In the three cases, when the hydraulic retention time (HRT) of biological system were 23, 34 and 21. 8 h, and the volume loading of influents (COD) were 1.75, 4.75 and 2.97 kg/(m3 x d), the corresponding COD removal were 97.3%, 98.1% and 95.8%. Furthermore the operating costs of projects were 0.91, 1.17 and 0.88 yuan per ton of water respectively. The index of effluent all met the 1st grade of Guangdong Province wastewater discharge standard. Results showed that the biological fluidized bed had characteristics of shorter retention time, greater oxygen utilization rate, faster conversion rate of organic pollutants and less sludge production, which made it overcome the shortcomings of traditional methods in printing and dyeing wastewater treatment. Considering the development of technology and the combination of ecological security and recycling resources, a low-carbon wastewater treatment process was proposed.

[Alveolar soft part sarcoma of the tongue root: a case report].

Alveolar soft part sarcoma is a rare, aggressive malignancy of uncertain histological origin with a propensity for vascular invasion and distant metastasis. The case presented involves a 31-year-old woman with alveolar soft part sarcoma in the tongue root. The clinical features, pathogenesis, diagnosis and treatment were discussed.

[A case report of sparganosis mansoni in the cheek].

Sparganosis mansoni is a kind of parasitic infective disease, rarely seen in clinic. A case of sparganosis mansoni is reported in this article. The patient was a 25-year-old male, who came to Xiangya Hospital on September 26, 2007 because of a mass in the left cheek. A white tape-like body was found during the operation and recognized to be a live parasite. Enzyme linked immunosorbent assay of the serum revealed positivity against Spirometra mansoni. The final identification proved that the white tape-like body was Sparganum mansoni. The disease of this patient was caused by eating raw flesh of frogs infected with the Sparganum mansoni.