The effect of Fenton sludge on anaerobic digestion of papermaking wastewater in an upflow anaerobic sludge blanket reactor.

An upflow anaerobic sludge blanket (UASB) reactor was used to investigate the effect of adding Fenton sludge (FS) on the anaerobic digestion of actual papermaking wastewater. The results showed that a one-time addition of 10 g/L FS could sustainably promote the performance of UASB for more than 40 days. The organic matter removal efficiency increased by 15.

Treatment of fracturing wastewater by anaerobic granular sludge: The short-term effect of salinity and its mechanism.

The effects of salinity shock on the anaerobic treatment of fracturing wastewater regarding chemical oxygen demand (COD) removal performance, sludge characteristics and microbial community were investigated. Results showed COD removal efficiency decreased from 76.0% to 69.

Use of extracellular polymeric substances as natural redox mediators to enhance denitrification performance by accelerating electron transfer and carbon source metabolism.

Extracellular polymeric substances (EPS) extracted from waste activated sludge were used as endogenous redox mediator to enhance denitrification performance. The nitrate reduction rate increased 1.42-fold when EPS were added at 75 mg C/L (C represents total organic carbon).

Development of stable agar/carrageenan-FeO-Klebsiella pneumoniae composite beads for efficient phenol degradation.

It's of practical importance but highly challenging for cell immobilization supports to maintain mechanical strength and reduce microbial leakage in environmental and industrial applications. Herein, we developed an agar/κ-carrageenan composite hydrogel to entrap Klebsiella pneumoniae with the combination of nano-FeO for processing phenol wastes. The agar/carrageenan-K.

Enhanced total nitrogen removal performance in a full scale Orbal oxidation ditch by a novel step aeration mode.

Two aeration modes, namely point aeration and step aeration, were proposed and implemented in a full scale Orbal oxidation ditch, and nitrogen removal performance was studied. The results showed that nitrogen removal performance under point aeration mode depended on oxygen supply control. Highest total nitrogen (TN) removal efficiency of 73.

Effect of mechanical elutriation on carbon source recovery from primary sludge in a novel activated primary tank.

A novel activated primary tank (APT) with an elutriation unit was developed for recovering carbon by the fermentation and elutriation of primary sludge, and the mechanical elutriation mechanism was analysed by conducting a batch fermentation experiment to improve carbon source recovery. The results indicated that a high stirring velocity gradient could cause sludge disintegration, which could not only shorten the fermentation time, but also increase the production of soluble chemical oxygen demand (SCOD) and volatile fatty acids (VFAs) by 8.3% and 9.

Feasibility study on repair for cranial defect of immaturity.

Aim: To evaluate use of a titanium mesh to fill cranial defects in growing animals, as a model for juvenile humans.

Material And Methods: Thirty two-month-old Seghers pigs were evenly assigned to one of three groups: controls, a defect group (unrepaired 5 x 5 cm lesion), and a repair group (repaired 5 x 5 cm lesions). Histological evaluations and morphological measurements were conducted to compare the groups.

Genetic screening for mutations in the chip gene in intracranial aneurysm patients of Chinese Han nationality.

We performed a case-control study to investigate whether SNPs of CHIP might affect the development of IA in Chinese Han nationality. We believe we are the first to have screened IA patients for mutations in the CHIP gene to determine the association with these variants. The study group comprised 224 Chinese Han nationality patients with at least one intracranial aneurysm and 238 unrelated healthy Han nationality controls.

Association between XRCC1 gene polymorphisms and risk of glioma development: a meta-analysis.

Objective: Previous studies of the association between X-ray cross-complementing group 1 (XRCC1) gene polymorphisms and the gliomas risk have yielded conflicting results, and thus a meta-analysis was performed to provide a more accurate estimation.

Methods: A computerized literature search of 5 electronic databases was conducted to identify the relevant studies. Fixed or random effect models were selected based on the heterogeneity test.