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.

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.

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.

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.

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.

Membrane filtration technique is a liquid separation technology, with high efficiency, low energy consumption and easy operation. Compared to traditional methods of wastewater treatment, membrane technology has many advantages, such as the circulatory use of wastewater and recovery of useful substances. The foundational theories and characteristics of several membrane filtration techniques, such as micro-filtration, electrodialysis, reverse osmosis, ultra-filtration, nano-filtration and so on are summarized. Research and development of membrane filtration techniques in the treatment of wastewater containing oil, dye, heavy metal and organic compounds with high concentration are introduced, respectively. In addition, the prospect of these techniques is also discussed in this paper.

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.

T he nanof iltrat ing ( NF) membrane w hich has been used for treat ing the circulating cooling sew age inheat pow er plant s is int roduced briefly. NF can effect ly remove the suspended part icles, and low er the total hardnessand reduce the salt content in the circulating cooling sew age. The removal of the total disolved solid( T DS)and the total hardness are above 90%, and that of the salt content is more than 80%. T he quality of treated watercan meet the requirements of industrial use and supply ing water of circulating cooling. The treatment of thecirculat ing cooling sewage in heat pow er plant is feasible to use nanofiltrat ing membrane sof tening equipment.T he t reated water can be reused in supplying systems. It could great ly decrease water consumpt ion and drainagequantity of indust ry wastewater. It w as a promising technolog y for water-saving and zero discharge in the fuelpow er plant.

Precision and recovery experiments have been done by Mohr method and potentiometry to determine the chloride ion content in tap water. The results indicate that both of the methods could satisfy the analytic demand. The standard deviation of automatic potentiometry is 0.099 mg/L， the relative standard deviation is 0.46%， and the indexed recovery rates are 90%-110%， which are obviously better than that gained by Mohr method.

In recent years,the advanced oxidation processes(AOPs) in which the free radicals(·OH) is generated has been paid more and more attentions for its advantage on the degradation of refractory organic pollutants.As a new form of AOPs,heterogeneous catalytic ozonation could combine the oxidizing capacity of ozone with the adsorption and catalysis of adsorbent quite well,which obtains higher mineralization of organisms.Most of researches show that the catalysts play an important role in the purifying process of different organisms.The mechanisms of catalytic ozonation are introduced briefly first,and then the catalysts recently used in this process are summarized in detail.

The technology combining electrodialysis with electrolysis is called ion-exchange membrane electrolysis. Its application in wastewater treatment has commenced recently. According to the fruits acquired in environmental protection by ion-exchange membrane electrolysis, its mechanism and applications to wastewater treatment are overviewed. Deficiency and progress in the future of ion-exchange membrane electrolysis technologyare also explored.

In chemical engineering production, the existence of high chloride influences the accuracy of COD determination directly. Through the comparisons of dilution method, silver nitrate precipitation method, silver nitrate and chromium potassium sulfate method, chlorine rectification method, and standard curve method, the rectified coefficient of the standard curve is obtained, to eliminate the interference of chloride-containing compound effectively. It can be operated flexibly and obtain comparatively accurate COD determination results. At the same time, it can reduce the harm to human bodies in laboratories and environmental secondary pollution caused by using the poisonous chemicals.

Microbial flocculant(MBF)is a kind of natural macro-molecular organism reproduced by bacterias.It has many perfect characters,such as safety,high efficiency,self-decomposed,no second pollution and high flocculatingprecipitation,which made it accord to the wastewater treatment requirement.The development of MBF research andapplications are reviewed,aspects are discussed.The chemical structure ofMBF is expounded.The culture conditions,mechanisms of flocculation,and the role of physico-chemical factors in the flocculating activity are discussed.In addition,some suggestions concerningthe future research are presented.

Coagulation-hydrolysis-oxidation process has been used for treating the medium-density fiberboard wastewater.The result shows that the process runs steadily with very good efficiency.The removal rate of COD_Cris more than 99.2%,and the quality of the discharged water can meet the first class standard of integrated wastewater discharge.

Antibiotic wastewater normally contains a lot of organic matter including bacteriostatic and toxic as well as recalcitrant compounds and has dark color, which therefore is regarded as a non-biodegradable wastewater. The introduction of advanced oxidation processes (AOPs)and its application progress in antibiotic wastewater treatment especially pretreatment are focused on, and the potential use of antibiotic wastewater treatment with AOPs is analyzed.

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).