The Research Progress of Flocculants in Sewage Sludge Dewatering

2012 ◽  
Vol 610-613 ◽  
pp. 1518-1521 ◽  
Author(s):  
Lei Cheng ◽  
Yan Zhen Yu ◽  
Yu Xing Zhou ◽  
Hua Dong Zhang ◽  
Miao Wan Li
Keyword(s):  
Sewage Sludge ◽  
Adverse Impact ◽  
Research Progress ◽  
Organic Polymer ◽  
Good Effect ◽  
Sludge Dewatering ◽  
Mud Cake ◽  
Single Use ◽  
Harmful Effects ◽  
Natural Modification

The sludge should have conditioning to enhance the characteristic of dewatering belong to its bad dewatering performance. The means we always use is chemical conditioning which is adding flocculants to the sludge to cooperate the machine dewatering. The single use of inorganic flocculants will increase the weight of the filtered mud cake and the results are generally not good. The synthetic organic polymer flocculants usually have good results but also have harmful effects on environment. The natural modification polymer flocculants and microbial flocculants have small adverse impact on environment with good effect in sludge dewatering and their application will be more and more widely with the development to the depth.

Effect of adding alum sludge from water treatment plant on sewage sludge dewatering

2016 ◽  
Vol 4 (1) ◽  
pp. 746-752 ◽  
Author(s):  
Jun Li ◽  
Liu Liu ◽  
Jun Liu ◽  
Ting Ma ◽  
Ailan Yan ◽  
...  
Keyword(s):  
Water Treatment ◽  
Sewage Sludge ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Sludge Dewatering ◽  
Alum Sludge

The Concentration and the Abatement Strategy of Organic Contaminants in Sewage Sludge Dewatering

2011 ◽  
Vol 356-360 ◽  
pp. 1495-1499
Author(s):  
Jie Yu ◽  
Guo Di Zheng ◽  
Tong Bin Chen
Keyword(s):  
Sewage Sludge ◽  
Organic Contaminants ◽  
Environmental Risks ◽  
Future Research ◽  
Sludge Dewatering ◽  
Sludge Disposal ◽  
Secondary Pollution ◽  
Pollution Problem ◽  
Safety And Environment ◽  
Abatement Strategy

Sludge agriculture application in future will be one of the main sewage sludge disposal ways in China. To ensure safety and environment of sewage sludge agriculture application, except to strengthen the research of sludge heavy metal, pathogen outside the organic contaminants will be one of the focuses of the future research, especially to strengthen the PAHs and NP/NPE. In order to reduce the environmental risks of sludge agriculture application, using biological aerobic fermentation processing technology treatment sludge can effectively reduce the organic contaminants, depress secondary pollution problem, which sewage sludge brings.

scholarly journals Research Progress of Geraniol in Tumor Therapy

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Hao Zhi ◽  
Jianying Cui ◽  
Hongli Yang ◽  
Yonggang Zhang ◽  
Meng Zhu
Keyword(s):  
Breast Cancer ◽  
Tumor Therapy ◽  
Pharmacological Action ◽  
Research Progress ◽  
Good Effect ◽  
Cancer Drug ◽  
Aromatic Plants ◽  
Anti Cancer ◽  
Different Types ◽  
Cancer Côlon

Geraniol is an acyclic monoterpenoid compound, which exists widely in aromatic plants. Geraniol has antibacterial and anti-inflammatory effects. Recently, it has been found that geraniol has a strong effect on improving immune function and anti-tumor. Many experimental evidences support that geraniol has a good effect on the treatment or prevention of different types of tumors, such as breast cancer, lung cancer, liver cancer, pancreatic cancer, colon cancer, prostate cancer, etc. it also has a synergistic anti-cancer effect with many anti-cancer drugs, revealing the mechanism of its more complex anti-tumor pharmacological action System. In this review, we summarized a variety of anti-cancer signaling pathways and targets. Geraniol is considered to be a safe, effective and promising multi-target anti-cancer drug, which is expected to become an important force in the anti-cancer of traditional Chinese medicine.

Study on the effect of chitosan conditioning on sludge dewatering

2019 ◽  
Vol 79 (3) ◽  
pp. 501-509 ◽  
Author(s):  
Jin Zhang ◽  
Qing Hu ◽  
Jie Lu ◽  
Shuang Lin
Keyword(s):  
Moisture Content ◽  
Extracellular Polymeric Substances ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Organic Polymer ◽  
Sludge Dewatering ◽  
Sludge Treatment ◽  
Residual Sludge ◽  
Sludge Cake ◽  
Polymer Flocculant

Abstract The difficulty of residual sludge dehydration is the major problem in sewage treatment. The reduction of moisture content in sludge can reduce the sludge volume significantly and is conducive to the subsequent disposal of sludge. As an organic polymer flocculant, chitosan (CTS) is widely used in water and waste water treatment. In this study, CTS was used in sludge treatment to improve the sedimentation and dehydration properties of sludge. When treated with CTS, the moisture content of sludge cake decreased from 85.9% to 83.0%, the SV30 decreased to about 1/2, and the sludge volume reduced to 82.9%. Further analysis showed that the zeta potential (ζ-potential) of the sludge changed from negative value to positive value, and the D50 of the sludge was larger than that of the raw sludge. In addition, when the moisture content of the sludge cake was reduced to the lowest, the concentration of extracellular polymeric substances (EPS) and SCOD was the largest and the |ζ| decreased to the lowest. CTS improved the dehydration and sedimentation performance of sludge mainly by factors of electrical neutralization, adsorption bridging and dissolution of EPS.

Self-recycling of sewage sludge as a coagulant and mechanism in sewage sludge dewatering

2020 ◽  
Vol 22 (6) ◽  
pp. 1867-1876
Author(s):  
Jiahuan Wu ◽  
Tao Lu ◽  
Guang Yang ◽  
Wei Meng ◽  
Haoran Yuan ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Sludge Dewatering

scholarly journals The application of biomass ashes for improvement of sewage sludge dewatering

2017 ◽  
Vol 17 ◽  
pp. 00100 ◽  
Author(s):  
Marta Wójcik ◽  
Feliks Stachowicz ◽  
Adam Masłoń
Keyword(s):  
Sewage Sludge ◽  
Sludge Dewatering ◽  
Biomass Ashes

Toxicity assays and their evaluation on organic polymer flocculants used for municipal sludge dewatering

1998 ◽  
Vol 38 (7) ◽  
pp. 207-215 ◽  
Author(s):  
H. Takigami ◽  
N. Taniguchi ◽  
Y. Shimizu ◽  
S. Matsui
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Algal Growth ◽  
Pilot Scale ◽  
Organic Polymer ◽  
Municipal Sludge ◽  
Sludge Dewatering ◽  
Algal Toxicity ◽  
Reproduction Tests

The toxicity of organic polymer flocculants used for the dewatering of municipal sludge was evaluated by using two different toxicity assays: the Closterium ehrenbergii algal toxicity test and the Bacillus subtilis rec-assay. The algal toxicity of the effluents from a pilot-scale sewage treatment plant was investigated with and without the addition of a flocculant (0, 0.05, 0.10 and 0.20 mg/L). No clear evidence on the toxicity caused by the flocculant was observed on both asexual and sexual reproduction tests of C. ehrenbergii. It was also found that the algal growth inhibition of various types of flocculants (i.e., cationic, anionic, amphoionic and non-ionic) was in the order of 1 to 20 mg/L, which was mainly due to a molecular weight (MW) fraction of greater than 100,000. The results of the B. subtilis rec-assay for these flocculants indicated that eight out of ten cationic flocculants caused the direct DNA damage with LC50 =0.1 to 10 mg/L. One of the genotoxic flocculants was also fractionated into their components by MW. The experimental results showed that the lethal effects were mainly contributed by the polymer fraction of MW greater than 100,000, although the genotoxicity was not detected in that fraction. Therefore, the detected genotoxicity of the flocculants could be caused by the combined effects of various components, such as polymers, oligomers, monomers and additives.

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