The efficient treatment of toilet black water and yellow water was an essential component of current wastewater treatment. According to the research process and treatment mode， the black water treatment technology could be divided into centralized black water treatment technology， dispersed black water treatment technology， emerging black water treatment technology and black water resource technologies. Most technologies， including biological， physicochemical， and other treatment methods， were focused on the treatment and recovery of nutrients due to the high concentration of nitrogen and phosphorus resources in source-separated yellow water. The different technical characteristics， principles， research status and application cases of black water and yellow water were summarized. And the corresponding development directions， such as source separation technology development， micro-pollutants advanced treatment and high-quality resource recovery were proposed.

Presently， the municipal wastewater treatment plants （WWTPs） only focus on the thresholds of the parameters specified in the wastewater quality discharge standards without considering new micro-pollutants such as pharmaceutical and personal care products PPCPs. Anaerobic digestion （AD） is a vital technology for achieving carbon neutral and excess sludge resource utilization in WWTPs， and the accumulation of PPCPs in sewage sludge would limit the technology promotion of the AD and resource utilization of residue. The sources and behaviors of PPCPs in WWTPs were briefly described， and the potential effects of high concentration PPCPs on AD performance were revealed with typical PPCPs frequently detected in WWTPs. The effects of typical PPCPs on key parameters including methane （CH4） yield， volatile acid distribution and microbial community in AD process were reviewed. Meanwhile， the post risk of PPCPs on AD of excess sludge was evaluated. The results showed that the typical PPCPs could promote sludge dissolution to provide more nutrients to microbes， while hydrolytic acidifying bacteria were hyperactivated by the stress of PPCPs， thus causing excess accumulation of volatile acids. Aceticlastic methanogens were more vulnerable to the inhibition of PPCPs compared with hydrogenotrophic methanogens， resulted in lower CH4 yield. And the resource utilization of biogas residue and slurry produced by AD along with PPCPs could pose potentially ecological risks. In the future research， the understanding of the exposure of PPCPs on bacteria and archaea should be deepened at the cellular level， and to develop new process that could both meet the effluent water quality discharge standards， alleviate the potential inhibition of AD by PPCPs， accelerate the carbon neutralization process in WWTPs and reduce the ecological risk of PPCPs.

The leachate treatment system of domestic waste incineration plants generally adopts the “anaerobic+biochemical+membrane+concentrated liquid re-concentration” process. There were some problems for this process such as long treatment process， complicated equipment operations， high equipment investment， and high operating costs. A new process of “softening +ultrafiltration（UF） +reverse osmosis（RO）” membrane treatment was used to replace the conventional “membrane + concentrated liquid re-concentration” process， and a pilot test of MBR effluent from a leachate treatment system in a incineration plant was carried out. The results showed that the new process was simple and easy to operate. When the overall recovery rate was 80%， the total hardness （calculated as CaCO3）， COD and Cl- removal rate of the MBR effluent reached 99.4%， 98.3% and 95.5%， respectively， achieved the treatment effect of the conventional process. And economic analysis showed that the new process saved about 46.7% in operating power consumption and equipment depreciation compared with the original process.

With the implementation of MSW classification in China， the amount of kitchen waste had increased greatly. Therefore， it was urgent to develop feasible treatment technology. Hydrothermal carbonization （HTC） is a value-added treatment of organic waste. However， the feasibility of HTC technology to kitchen waste treatment is still unclear. The Characteristics of HTC of three typical kitchen waste components including starch （steamed bread）， cellulose （long cabbage）， protein （lean pork） and the real mixed kitchen waste were investigate. The hydrochar yield and the product properties were studied under different carbonization temperatures， constant temperature time and moisture contents. The besults showed that the HTC temperature and the constant temperature time were the key factors determining the hydrochar yield and the carbonization degree， while the effect of the moisture content had little influence.There were significant differences in the properties of hydrothermal carbonization products of the three kinds of kitchen waste materials. The hydrochar yield from the starch raw material （41.7%~52.4%） was higher than that from the cellulose raw material （27.3%~47.5%）. The two kinds of hydrochar both had a microsphere morphology and presented a high carbonization degree. However， the protein raw materials were not easy to produce hydrothermal carbon （yield only 6.2%~24.0%）， with no fixed form and low carbonization degree. The hydrochar yield of real mixed kitchen waste was 49%， with a high carbonization degree. Thecarbonization fluid from starch and cellulose raw materials was acidic （pH was 3.1~4.7）， while that from the protein raw material wasneutral or alkaline （pH was 6.2~9.2）. The protein raw material was the main contributor to the total organic carbon and the humic acid of the carbonization fluid. The hydrothermal carbonization fluid obtained from real kitchen waste was acidic and contained certain organic substances such as nitrogen， phosphorus nutrients and humic acid， which provided the possibility for further resource utilization.

The distributed aerobic composting equipment has the advantages of intensive， environmental protection， economy， etc， and has a broad market prospect. The self-developed distributed composting device was used to carry out the continuous compost experiment of vegetable waste collected from the market， and the operation efficiency and the quality of compost products were analyzed in this study. The results showed that the mass loss rate of organic waste was 72.1%， and the moisture content of the products was 51%～55% under the conditions of continuous feeding and composting for more than seven days. The average energy consumption of the device was 220 kWh/d. Thermal insulation heating was the most energy consuming part of composting equipment， which was 160 kWh/d. It was mainly used for heat supplement of the composting bin and water vaporization. According to the energy balance analysis， the existing operating energy consumption could be reduced by 40%， reflected in strengthening insulation， accelerating the water vapor discharge and waste heat recovery in the warehouse and other links. Secondary compost of compost products could further reduce the moisture content， improve the pH， nutrient content and seed germination index， so as to improve the integrated quality of compost products and reduce the cost of vegetable waste. Continuous aerobic compost combined with secondary compost to treat vegetable waste is an important technical way to realize the rapid stabilization， reduction and recycling of vegetable waste.

The nutrients in biogas slurry was concentrated by membrane concentration technology and the concentrated liquid was used as organic fertilizer, which was a way of biogas slurry resource utilization. In view of the high content of suspended solids in the biogas slurry, which caused the membrane pores to block during the membrane concentration treatment, the “pretreatment + microfiltration membrane” process was used to treat the kitchen anaerobic biogas slurry. Experiment was carried out to study the removal effect of pretreatment process on suspended solids in biogas slurry, as well as the operating process parameters of microfiltration ceramic membrane, the contaminant removal effect, and the membrane cleaning effect. The results showed that under the optimal process parameters of natural settling for 24 h, aeration volume of 5 L/min, continuous aeration for 18 h, microfiltration ceramic membrane pore size of 400 nm, and operating pressure of 0.3 MPa, the membrane flux could reach 34 L/(m2?h) and the optimal concentration ratio of biogas slurry was 5~6 times. In addition, a better cleaning effect and 96% of the membrane permeate flux could be achieved by the combined cleaning way of sodium hypochlorite, sodium hydroxide and citric acid, or sodium hypochlorite, sodium hydroxide and nitric acid.

With the continuous improvement of people's living standards， the amount of kitchen waste was increasing year by year， and the problem of disposal of kitchen waste was becoming more and more serious. The use of mechanical pretreatment + anaerobic digestion to treat kitchen waste was the primary process of many large-scale kitchen waste treatment plants， but about 7%～15% of organic residues were still produced after three-phase separation pretreatment. How to further utilize resources remained to be studied. The comprehensive disposal project of kitchen waste in Changzhou was taken as an example. Through the comparative studied of anaerobic digestion and insect feeding of organic residues， the appropriate and economic treatment of organic residues was discussed. The research results showed that compared with anaerobic digestion， the economic benefit of insect feeding was doubled， and it was a relatively economical way of recycling organic residues of kitchen waste.

Taking food waste anaerobic fermentation broth as a carbon source had been a favorable way to improve the denitrification effect of sewage treatment plants. Therefore， it was worth studying to improve the small molecular organic acids in the fermentation products that were easily utilized by denitrifying bacteria. Combined with the restriction factors of anaerobic fermentation， the effects of pH on the composition and denitrification performance of volatile organic acids and organic acids such as lactic acid in food waste fermentation broth were studied. The results showed that pH adjustment was conducive to the hydrolysis and acidification process， there was no significant difference of organic acids concentration at different pH. And when the pH was adjusted to five， though the soluble carbon sources in the fermentation products was low， but the concentration of lactic acid and organic acid was highest in the soluble fermentation products， reached 67.77% and 93.04%， respectively. The denitrification performance of using fermentation broth with different pH as carbon sources was tested. The result showed that pH adjustment was also beneficial to improve its denitrification performance， the higher of lactic acid content in the fermentation broth， the stronger the denitrification capacity of the fermentation broth was， the faster the denitrification rate was， and it was less likely to lead to the accumulation of [NO-2]-N accumulation. In summary， when the pH was adjusted to 5， the concentration of the soluble carbon source would be limited by hydrolysis， but its composition was more suitable as a carbon source for denitrification.

Large amount of industrial waste salt was generated during the organic and inorganic chemical processes, and most of the salts were produced in the pesticide manufacture industry, followed by the fine chemical industry and pharmaceutical industry. At present, the treatment and disposal of industrial waste salt focused on reduction, harmless and resource recycling. The commonly used reduction treatment techniques included recrystallization, precipitation-recrystallization, salt washing and extraction, but they were rarely applied in practical engineering. Harmless treatment technologies included neutralization detoxification, heat treatment, solidification and landfill, and wet oxidation technology, among which the solidification and landfill were commonly used. Resource recycling technology included ion membrane caustic soda, recovery of valuable metals, and preparation of cement, soda ash and sodium dihydrogen phosphate. Resource recycling of industrial waste salt was encouraged and supported by the country, while it was highly restricted by technology, cost, market and other factors. Therefore, high efficient, low cost and composite recycling technology, and coupling multiple technologies into a composite process need to be developed in the future, in order to strengthen the removal of impurities in industrial waste salt and improve competitiveness of product. In addition, the product quality detection and environmental pollution risk assessment for the recycled products should be strengthened during the resource recycling process.

The pH of environmental medium was the key factor to control the release of heavy metals in fly ash. Therefore， it was necessary to study the leaching behavior of heavy metals in fly ash in different acidic environments. The dissolution behavior of heavy metals in four acidic environment provided by HJ/T 300—2007 Solid Waste-Extraction Procedure for Leaching Toxicity-Acetic Acid Buffer Solution Method， HJ/T 299—2007 Solid Waste-Extraction Procedure for Leaching Toxicity-Sulphuric Acid & Nitric Acid Method， Toxicity Characteristic Leaching Procedure（TCLP） and NEN 7341 Leaching Test of Leaching Characteristics of Building Materials and Solid Wastes Standards was discussed. And the leaching characteristics of heavy metals in four kinds of solidified fly ash， such as chelating agent TS-300， chelating agent SDD， cement and chelating agent SDD+cement， were analyzed when the acid neutralization capacity was completely consumed in the simulated acidic environment of landfill. The results showed that HJ/T 300—2007 had strict requirements for heavy metal leaching. The order of fixing ability of different additives to heavy metals from strong to weak was TS-300， SDD， SDD+cement and cement. The amount of cement added was positively related to the acid neutralization capacity of solidified fly ash and the dilution effect of heavy metal leaching. In order to reduce the environmental safety risk of fly ash landfill， the use of cement solidification as pretreatment should be avoided as far as possible.

The application effect of 5M1E management in epidemic prevention and control and standardized operation of medical waste disposal center during the epidemic period of COVID-19 pneumonia was discussed. Using the 5M1E management plan， combined with the characteristics of the medical waste disposal center， the management measures from the six aspects of manpower， machine， material， environment， methods and measurement were taken. And a number of epidemic prevention and control suggestions for medical waste disposal centers were put forward.The results showed that outbreak of the COVID-19 pneumonia to the present（January 1， 2020—March 25， 2022）， the medical waste and epidematic-related waste within the service scope of the medical waste disposal center shall be collected and disposed of as much as possible. And there have been no suspected or confirmed cases of COVID-19 related to the collection， transportation and disposal of medical waste. The disposal center operates stably and regulated， with zero complaints. It was effective and feasible to implement the 5M1E management plan during the new crown pneumonia epidemic， which was worth learning and promoting.

With the rapid progress of urbanization in China， more and more domestic waste landfills were located in the urban area， which caused a large amount of land occupation， environmental pollution， and adverse effect on urban planning， which was in urgent need of treatment. Based on the overview， analysis and comparison of various treatment technologies for landfills， it was considered that the mining and Screening technology was the most suitable treatment technology for landfills with old age and high degradation stabilization degree， which could realize the landfill capacity recharge， pollution source removal， material recycling after screening， and land reuse. The comprehensive treatment project of Woqishan landfill in Wenzhou was taken as an example. According to the results of site investigation and the demand for the future land use， a suitable mining and Screening technology process for MSW landfill in southern China was proposed. The social， environmental and economic benefits obtained by using mining and Screening technology were analyzed. And the demonstration and technical support were provided for the comprehensive treatment of the same type landfills.

The overall design of a decoration and renovation waste （DRW） resource utilization project in Taihu basin was introduced. The project was mainly divided into two parts： DRW pretreatment system and aggregate brick system. The waste pretreatment process adopts the combined process of “two-stage crushing + three-stage screening + three-stage sorting”， and the products were mainly recycled aggregate， standard brick， municipal brick and permeable brick， etc. The construction of the project achieved sustainable development of resources and environment. At the same time， it could actively promote the local urbanization process and the construction of a harmonious society. It has great reference value for other similar scale DRW resource utilization projects.