A model was prepared for the preparation of biochar from the biomass of mushroom residue at different carbonization temperature (350 °C,450 °Cand 550 °C) for adsorption characteristics of ammonium nitrogen in water through different ammonium nitrogen concentration, reaction time, pH and temperature. The investigation result showed that the adsorptive amount of these three biochar substances increased quickly with the initial concentration (0-2 h) and the adsorption equilibrium was reached after 4 hours. The adsorptive amount of these three biochars increased with the rise of pH from 5 to 9. Different temperature preparation of biochar on ammonium nitrogen adsorption increases with the rise of temperature. Different temperature preparation of biochar on ammonium nitrogen adsorption amount is in the order of 550 °Cbiochar > 450 °Cbiochar > 350 °Cbiochar.

In this paper, laboratory glassware with different nature of dirt and experimental requirements is required to choose different washing methods.

In this paper, we elaborated the common failures of the Total Organic Carbon (TOC) analyzer, and proposed the solution for each failures. At the same time, we also introduced the considerations of daily maintenances.

It is discribed that the reductive method of copper in the reduction tube and how to optimize oxygen dosing of Vario EL III elemental analyzer.

This work was a trial to reduce the emission of the toxic methyl nitrite gas by a modified absorption process and reutilize the wastewater produced in the absorption process from a nitromethane synthesis plant in laboratory scales. In the modified gas treatment experiment, it was found that, after a 90 minute circulation period, the uptake of methyl nitrite into NaOH solution was 21.4% more than traditional method. The wastewater reuse experiments consisted of a three step process: pretreatment, desalination and reuse. NaNO2, the salt reclaimed from attapulgite (ATT) and powder active carbon (PAC) decolored wastewater through desalination, was reused as raw material in nitromethane synthesis. The synthesis efficiency using NaNO2 recovered from ATT decolored wastewater was 78.7% and the purity of raw product was 98.3%. The corresponding results of PAC were 61.8% and 92.5% respectively. Considering the possibility of greater economic and environmental benefits to nitromethane manufacturers, the ATT pretreatment-desalination-reuse technology would be chosen for pilot-scale experiment.