scholarly journals Sensitivity of Chinese industrial wastewater discharge reduction to direct input coefficients in an input-output context

2014 ◽  
Vol 25 (1) ◽  
pp. 85-97 ◽  
Author(s):  
Zhipeng Tang ◽  
Peiping Gong ◽  
Weidong Liu ◽  
Jiangsu Li
Keyword(s):  
Industrial Wastewater ◽  
Wastewater Discharge ◽  
Input Output ◽  
Direct Input

scholarly journals Industrial Wastewater Discharge Retrieval Based on Stable Nighttime Light Imagery in China from 1992 to 2010

2014 ◽  
Vol 6 (8) ◽  
pp. 7566-7579 ◽  
Author(s):  
Zhaofu Li ◽  
Hongyu Liu ◽  
Chuan Luo ◽  
Panpan Li ◽  
Hengpeng Li ◽  
...  
Keyword(s):  
Industrial Wastewater ◽  
Wastewater Discharge ◽  
Nighttime Light ◽  
Nighttime Light Imagery

Removal of Copper Ion in Industrial Wastewater by Magnetic Flocculation Experimental Research

2013 ◽  
Vol 295-298 ◽  
pp. 1231-1234 ◽  
Author(s):  
Yong Gui Yang ◽  
Yun Long Yang ◽  
Xiao Hong Kang
Keyword(s):  
Industrial Wastewater ◽  
Ph Value ◽  
Copper Ions ◽  
Removal Rate ◽  
Copper Ion ◽  
Good Effect ◽  
Magnetic Powder ◽  
Wastewater Discharge ◽  
Sedimentation Time

An experiment on the removal of heavy metal copper ions from industrial wastewater by magnetic flocculation was studied and the influences of PFS dosage static sedimentation time，temperature，pH value and magnetic powder dosage on treatment effect were discussed at the same time .The result of the test showed that when the dosage of PFS and magnetic powder were 100 and 400 mg/l respectively the pH value was 8.0，the static sedimentation time was 20min, the said process had a good effect on copper containing wastewater treatment. The removal rate of copper ions was over 97％，and the mass concentration of copper ions in the effluent water was below 0.5mg/l. Therefore after be treated by magnetic flocculation the quality of copper-containing wastewater could meet the requirement of GB 8978-1996 Integrated Wastewater Discharge Standard .

Study on the Treatment of Nylon Chemical Industrial Wastewater by AF+ A/O Process

2011 ◽  
Vol 71-78 ◽  
pp. 3133-3136
Author(s):  
Jie Zhang ◽  
Qun Hui Wang ◽  
Peng Li ◽  
Hai Ming Huang ◽  
Wen Jun Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Treatment Effect ◽  
Industrial Wastewater ◽  
High Efficiency ◽  
First Grade ◽  
Wastewater Discharge ◽  
N Removal ◽  
New Type ◽  
Nitrogen Treatment ◽  
A Company

A company in Pingdingshan of Henan province using a new type of AF (high-efficiency immobilized biological anaerobic biofilter ) and A/O process to treat nylon chemical industrial wastewater, In this study, we monitored the system for one month (Dec.1.2010-Jan.1.2011). The effect of the conditions of temperature, pH and COD, nitrate, ammonia and total nitrogen treatment effect along the system were investigated, the results showed that: average COD removal efficiency reached 97%, average NH4+-N removal efficiency was higher than 90% and the effect of the system is good. The effluent meets the first grade criteria of integrated wastewater discharge standard (GB8978-1996).

Hollow Zinc Oxide Microflowers for Selective Preconcentration of Selenium Ions in Natural Water

2020 ◽  
Vol 16 (8) ◽  
pp. 957-964
Author(s):  
Ting Huang ◽  
Guanghui Yuan
Keyword(s):  
Adsorption Capacity ◽  
Natural Water ◽  
Industrial Wastewater ◽  
Agricultural Runoff ◽  
Environmental Pollutant ◽  
Maximum Adsorption Capacity ◽  
Wastewater Discharge ◽  
Atomic Fluorescence ◽  
Ph Values ◽  
Naoh Solution

Background: Selenium’s popularity in a wide variety of products and industries means that it has, unfortunately, become a common environmental pollutant, particularly from sources such as industrial wastewater discharge and agricultural runoff. Objective: Quantification of the selenium (IV) ion content of natural water sources via atomic fluorescence spectrophotometry (AFS) was performed using hollow ZnO microflowers as the enriched materials. The hollow ZnO microflowers were prepared via a hydrothermal method with polystyrene (PS) microspheres as the template. Methods: Since the pH of the selenium (IV) solution is known to influence the degree of adsorption onto the sorbent, both the acidity of adsorption and elution were studied at various pH values to obtain the adsorption isotherm and adsorption capacity of the sorbent. AFS was used to quantify the amount of selenium ion that was present in the samples. The structure of the hollow ZnO microflowers was characterized using XRD, SEM, and TEM characterization methodologies. Results: When the pH was between 6.0 and 7.0, the percentage of Se (IV) adsorption was as high as 93%. It was found that the amount of Se (IV) that was eluted from the sorbent exceeded 96% with 5.0 mL of a 0.01 mol L−1 NaOH solution over the course of 10 minutes. The maximum adsorption capacity was 31.5, 31.8, and 32.0 mg·g−1 at 273, 333, and 353 K, respectively. Conclusion: The LOD for Se (IV) detection via enrichment was achieved at 0.006 μg L−1 with a linear range between 0.1 and 200 μg L−1. Thus, this method is applicable to the analysis of natural water samples and GBW(E)080394.

New Insight Into The Spatial Autoregressive Model of Industrial Wastewater Discharge In The Yellow River Basin

2021 ◽  
Author(s):  
Libo Xia ◽  
Zhiliang Wang ◽  
Shuang Du ◽  
Decun Tian ◽  
Feng Chen
Keyword(s):  
Economic Development ◽  
River Basin ◽  
Industrial Wastewater ◽  
Yellow River ◽  
Yellow River Basin ◽  
Pollutant Emissions ◽  
The Yellow River ◽  
Wastewater Discharge ◽  
Spatial Autoregressive ◽  
The Yellow River Basin

Abstract This article has carried out a statistical analysis of the industrial wastewater discharge (IWD) and gross regional product (GRP) of 79 cities in the Yellow River Basin from 2003 to 2019. By calculating the Moran index of IWD and GRP, the study has found that a certain spatial autoregressive in space. There is an environmental Kuznets curve (EKC) between the environmental pollution and economic development of cities in the Yellow River Basin, and a spatial autoregressive is modelled by a set of random effects that are assigned a conditional autoregressive prior distribution. In the Bayesian environment, Markov chain Monte Carlo (MCMC) is used for inferencing, and the spatial weight matrix is ​​selected to be U-shaped matrix, and the error of the model is minimized. The parameter posterior distribution results of the model showed that the GRP did not show a significant decline. The modified EKC showed that the discharge of industrial wastewater in the entire Yellow River Basin will be reduced. Generally, cities with high pollutant emissions should learn from other cities to reduce emissions, and cities with low GRP need to increase local economic development.

Study on Advanced Pretreatment of Seawater by Electrolysis and Neutralization of Acidic Waste Water with By-Product Magnesium Hydroxide

2013 ◽  
Vol 821-822 ◽  
pp. 1071-1080
Author(s):  
Jing Nie ◽  
Shou Zhi Yi ◽  
Di Miao
Keyword(s):  
Removal Efficiency ◽  
Magnesium Hydroxide ◽  
Current Density ◽  
Industrial Wastewater ◽  
Removal Rate ◽  
Influence Factors ◽  
Operation Time ◽  
Wastewater Discharge ◽  
Electrode Distance

The advanced pretreatment by electrolysis of Bohai seawater in Tianjin used a diaphragm electrolyzer in the experiment. Removal efficiency and influence factors of the method were analyzed. Results show that turbidity, organic compounds, SDI and chroma of seawater were effectively decreased by electrolysis. Removal efficiency was significantly increased by current density, operation time and inter-electrode distance, and the optimum electrolytic conditions was determined as inter-electrode distance of 2 cm, current density of 15.87 mA·cm-2, operation time of 10 minutes. It was investigated that when the water quality after electrolysis was of pH 8.6, the chroma and turbidity decreasing trend slowed down, with chroma of 0.052 A, removal rate reached 88.4%; the residual turbidity reduced to 2.52 NTU, removal rate reached 90.71%. A PH of about 8.5, CODCr decreasing trend slowed down, and when CODCr < 750 mg/L, it conformed to the requirements of the reverse osmosis water. With the study on neutralization of steel pickling waste liquor by the by-product of magnesium hydroxide, it is found that the quality of treated water reached 3rd level national emissions standards (300-1000 mg/L). Magnesium hydroxide slurry of Cr (VI) removal rate reached 100%, conforming to the 1st level national industrial wastewater discharge standards (< 0.5 mg/L).

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