Fenton oxidation is an advanced oxidation technology with the advantages of short reaction time，high degradation efficiency and simple operation，so it is one of the most promising methods for the treatment of refractory organic wastewater. However，there are some technical defects in the traditional Fenton oxidation process，including the narrow pH value of the reaction，the production of iron-containing sludge and the addition of high dose H₂O₂ and so on. In view of the limitations of Fenton oxidation，the latest technical measures to solve these problems are reviewed in this paper，including expanding the initial pH of Fenton to neutral or alkaline，reducing the production and recycling of iron mud，and generating H₂O₂ in situ. The basic principle of each measure and its application in the treatment of refractory organic pollutants are reviewed.

The degradation of organic wastewater by coated photocatalyst has promising future. And the immobilized photocatalyst is attracting people day by day with its specific merits.The preparation and application of TiO₂-coated photocatalyst are discussed after the brief statement of normal uncoated photocatalyst degrading organic wastewater.

Pharmaceutical wastewater has become one of the refractory industrial wastewater due to its high organic content，strong toxicity and complex pollutant components. The discharge of pharmaceutical wastewater without treatment or not up to standard after treatment will pose a potential threat to organism health and environment through a variety of ways，causing problems such as bioaccumulation and widespread drug resistance. How to effectively treat it has become a research hotspot in the field of water treatment. In this paper，the current research progress of pharmaceutical wastewater treatment technology and the combination of multiple technologies was systematically summarized from three aspects of physical method，chemical method and biological method. Combined with the latest research reports and application cases in this field，it was pointed out that the current wastewater treatment technology had many problems，such as high cost，low efficiency and poor treatment effect，and made a prospect for the future technology development according to the existing problems. At last，it was pointed out that the short process-classification treatment，separate-quality-recovery and utilization of valuable component，and collaborative optimization of wastewater treatment in process units and enterprises were effective ways to achieve low-carbon and efficient treatment of pharmaceutical wastewater.

Traditional Chinese medicine wastewater with high chroma and high content of organic matter has been intensively pretreated by electrolysis-flotation，and then by UBF and MBR. The technological practice shows that the removal rates of COD and chroma by electrolytic-flotation enhanced pretreatment are about 45% and 80%，respectively，and the pretreatment improves the biodegradability of the wastewater to ensure the effect of the subsequent biochemical treatment. The process can remove COD，BOD5，SS and chroma effectively and its effluent can reach the discharge standard of water pollutants from new enterprises in the Discharge Standard of Water Pollutants from Pharmaceutical Industry of Chinese Medicine Category(GB 21906—2008).

Some information of fly ash，such as its source，quantity，hazards，the main components and properties are introduced. The preparation of various polysilicate coagulants using fly ash as main raw material is reviewed. Preparation methods，category，situation of research and result of utilization are also introduced. The reaction mechanisms of preparing coagulants for wastewater treatment are analyzed. Problems existing in the preparation of polysilicate flocculants from fly ash are summarized. Suggestions on how to exploit and make use of fly ash more efficiently are brought forward.

The conditions for the preparation of activated carbon from corn cob as raw material,treated with NaHCO3 as activating agent,through microwave radiation have been optimized by response surface method(RSM) and central composite design(CCD).The effects of the radiation power,radiation time,and impregnation ratio on the adsorption capacity and yield results are investigated.The optimum conditions for preparing activated carbon from corn cob are as follows:radiation power is 385.74 W,radiation time 5 min and impregnation ratio 4.The experimental and predicted results for the adsorption capacity on methylene blue(MB) and yield of AC are 241.76 mg/g,27.39% and 253 mg/g,28.28%,respectively.The predicted adsorption capacity and yield after process optimization conform to the experimental values,verifying the efficiency of the model.

Membrane biology technology is a new type of wastewater treatment technique for controlling water environment worsening and alleviating the shortage of water resource. The characteristic and mechanism of membrane biology technology are introduced detailedly, such as removal efficiency, operation parameters, microbial characteristic, mechanism of pollutants removal and membrane pollution. Membrane biology technology will be improved rapidly and applied more widely.

A fix-packed bed photocatalytic reactor has been designed. The photocatalytical degradation characteristics of the three kinds of biorefractory organic industrial wastewater from printing, dyeing, pharmacy and paper-making are investigated. The results show that the photocatalytic degradation of the COD_Cr of printing and dyeing and paper-making accord with zero grade reaction kinetics model, and the COD_Cr of pharmaceutical wastewater accords with complex reaction kinetics model. While 650 W UV irradiates for 240 min, BOD₅/COD_Cr of the three kinds of wastewater increase by more than 0.5.

针对德士古水煤浆加压气化工艺过程中的黑灰水具有高压、高温、高浊、高硬等特点，参考国内外先进技术，对灰水分散剂NKC-920A的研究及应用进行了阐述，并通过实践证明NKC-920A具有抗高温、高分散、高阻垢性能，在德士古黑灰水高浊、高温、高硬度、高压条件下，对CaCO₃、Ca₃（PO₄)₂、CaSO₄、Fe₂O₃及细渣，具有强力分散阻垢作用。

A novel inorganic-organic composite flocculant, PFMS-PDMDAAC, has been synthesized by using FeSO₄, MgSO₄ and polydimethyl diallyl ammonium chloride(PDMDAAC) as raw materials and has been applied to the treatment of landfill leachate.The coagulation results indicate that PFMS-PDMDAAC has good coagulative effect on the treatment of landfill leachate.Its composite coagulative effect is not only better than that of PFMS, but also better than the kind of adding form of PFMS+PDMDAAC.When treating the landfill leachate the coagulation efficiency of PFMS-PDMDAAC is higher than that of PFMS and that of PFMS+PDMDAAC.The composite of PFMS-PDMDAAC plays a synergistic effect of PFMS and PDMDAAC and the coagulation efficiency has been heightened after complex formulation.

As an oxygen releasing compound, magnesium peroxide has high content of reactive oxygen species, weak alkalinity of hydroxide generated by reaction with water, and little impact on environment. Therefore, magnesium peroxide has great application prospects in environmental remediation. However, the existing magnesium peroxide preparation technology has a series of problems, such as complex preparation process, low product purity, which greatly restricts its application and promotion. High-purity magnesium peroxide was prepared from magnesium oxide and hydrogen peroxide, and modified with surfactants to enhance its migrational ability in aquifers, and applied for in-situ remediation. Experimental results showed that the purity of magnesium peroxide reached 94% when the ratio of magnesium oxide mass(in grams) to hydrogen peroxide volume(in mL) was 1∶16, and continuing to increase the amount of hydrogen peroxide would not significantly improve the purity of magnesium peroxide. Surfactant could improve the stability of magnesium peroxide suspension, in which the combination surfactant of sodium dodecyl sulfate and sodium carboxymethyl cellulose had a significant effect on the modification. The modification effect was best when the dosage of both surfactants was 2% of the mass of magnesium peroxide, without separation and sedimentation in 1 hour. The modified magnesium peroxide has excellent migrational ability in aquifer media, and the larger medium particle size and higher flow rate are beneficial to the migration of magnesium peroxide.

Improving the heat transfer efficiency of heat exchange equipment in the industrial production processes holds paramount significance for energy conservation and emission reduction. Scale inhibition is an effective approach to enhance heat transfer efficiency and is crucial means for the energy and power engineering sector to achieve “Dual Carbon” goals. Physical fields such as magnetic field, ultrasonic field, and high voltage electrostatic field scale inhibition technology have the advantages of simple operation, sterilization, algaecide, continuous treatment, and no chemical waste liquid. Firstly, the current research status of scale inhibition using constant magnetic fields and high-frequency electromagnetic water treatment technologies was introduced, and the optimal scale inhibition frequencies/bands of the magnetic field under different working conditions were discussed in detail. Secondly, the latest research results on scale inhibition using ultrasonic fields and high voltage electrostatic fields were introduced. The cavitation effect of the ultrasonic field and its pre-treatment effect could be used to filter and remove dirt in advance. After treatment with a high voltage electrostatic field, the scale layer became loose, and the morphology and characteristics were changed. Finally, the shortcomings of physical field scale inhibition technologies such as magnetic field, ultrasonic field and high voltage electrostatic field were proposed, and prospects for future research on the synergistic effects and molecular dynamics simulation of physical field scale inhibition were outlined.

Radioactive strontium(Sr) is an important nuclear fission product in the nuclear industry, which has a long half-life and persistent biological toxicity. With the development and utilization of nuclear energy, the radionuclide strontium is inevitably released into the environment, which brings great harm to human beings and the environment. Therefore, treatment of radioactive strontium containing wastewater has attracted wide attention. The adsorption method has the advantages of high selectivity, clean and simple process, easy regeneration treatment, and high efficiency. In recent years, it has been widely used to treat radioactive strontium contaminated wastewater. The latest research in treatment of radioactive strontium containing wastewater by adsorption was reviewed. The new composite materials in the adsorption and removal of strontium in water were focused on. The adsorption properties of single and composite adsorption materials for Sr²⁺ were compared, and the important factors and adsorption mechanism were analyzed and summarized. The adsorption capacity of different adsorption materials was compared. Furthermore, the development direction of adsorption technology in strontium removal in future was prospected.

The recent advances in research of the relationship between the chloride ion and the corrosion of stainless steel in cooling water system are reviewed. The mechanism of chloride ion which result in pitting, crevice corrosion, stress-corrosion cracking of stainless steel in cooling water system, the chloride ion limits and other factors influencing the localized corrosion of stainless steel are discussed. At the same time, the comments on how to deal with the negative effects of chloride ion in cooling water are made.

This paper introduces the chemical composition, constitution and characters of zeolite, and reviews the application of zeolite to water supply treatment, micro-polluted water treatment, domestic sewage treatment and industrial wastewater treatment in recent years.

The system of advanced treatment the circulating cooling discharged water in Yantai Power Plant is introduced. The system which consists of pretreatment, predemineralization, primary demineralization and deep demineralization, makes the circulating cooling discharged water in Yantai Power Plant as aquifer, to yield desalted water. The water, combined with the desalted water which is yielded by water treatment workshop, is supplied to the boiler and primary heat exchanger of heat supply network in Yantai. Since the system has been put into operation, it has diminished the cycles of concentration of circulating water, improved the operational condition of circulating water, solved the problems of circulating water treatment, realized the circulating cooling discharged water recycling, fulfilled the zero discharge of circulating water, enhanced the utilization coefficient of water resources and reduced the water consumption in Yantai Power Plant.

H₂O₂/copperized iron powder system is used for treating the acidized wastewater in North China Oilfield. The effects of initial pH, H₂O₂dose, copperized iron powder dose and reaction time on COD Cr removal efficiency have been studied respectively. The results indicate that technical parameters suitable for pretreatment are:initial pH 3.52, H₂O₂dose 40 mg/L, copperized iron powder dose 4 g/L and reaction time 30 min. The COD _Cr removal rate can reach 90.2%, which provides relatively helpful environment for the next procedure.

The new development of the determination of ozone concentration both in China and abroad are introduced. It mainly includes the newachievement of researches on iodometric method, spectrophotometry method, chemical-luminescence method, electrochemical method etc. The advantages, disadvantages and applicability of various methods are different. Therefore, the choice of application should be made depending on the actual situation and the determining requirments. Which one is the best can also be determined by the comparison of various results.

Per- and polyfluoroalkyl substances(PFAS) are persistent organic pollutants that are chemically stable and difficult to degrade. These compounds can be detected in environmental media, such as water and soil, and have the potential to accumulate in the human body through the food chain, posing risks to reproductive and immune systems. Consequently, efficient PFAS degradation has gained widespread attention. Hydrothermal alkaline treatment (HALT) utilizes subcritical water (170-350 ℃,2-22 MPa) under strongly alkaline conditions to generate hydroxyl radicals (·OH). These radicals attack the carboxyl or sulfonic groups in PFAS to facilitate decarboxylation or desulfonation, hydrolytic defluorination, and rapid complete degradation. HALT represents an efficient, low-energy, and cost-effective technique for PFAS treatment. This paper summarized effects of HALT on PFAS degradation and defluorination, explored the influence of reaction conditions (such as alkali concentration, temperature, catalysts, and environmental matrices), and elucidated the decarboxylation-hydroxylation-elimination-hydrolysis pathway. Additionally, the practical engineering outcomes of HALT in treating aqueous film-forming foam wastewater, remediating PFAS-contaminated soil and water bodies, regenerating PFAS-saturated activated carbon, and processing Typha latifolia with accumulated PFAS were reviewed. Lastly, the paper anticipated future research directions for HALT, aiming to provide theoretical guidance and technical references to advance the development of HALT dealing with PFAS.

The supercritical water and oxygen or air can completely be dissolved with each other, and can oxidize organic waste rapidly, becoming harmless liquid or gaseous inorganic small-molecular compound. Therefore, the su-percritical water oxidation (SCWO) technology has rapid development in recent years, and has become a potential and green organic wastewater treatment technology. Its features, principles, process flowand reactor are introduced.Its application is presented in detail. The problems in its application and future research orientation are pointed out.