Parfect

The selection and treatment effects of petroleum contaminated soil remediation technology are closely related to the composition and properties and changes of petroleum pollutants in soil, and the soil environment. In the past 30 years, foreign study on bioremediation of petroleum contaminated soils showed rising trend, from the laboratory to the in situ remediation , from the isolation of degrading bacteria to the application of genetic engineering technology. In situ remediation technology is relatively simple, low cost, but there are environmental impact, time-consuming, slow and easy to make the proliferation of pollutants and other shortcomings. Ectopic remediation technology can improve the treatment efficiency by strengthening the degradation conditions, but need to transport the contaminated soil, and using a certain site and installation of ventilation equipment will increase the processing costs. The kind and residue of residual oil largely determine the technical difficulty,

Soil pollution is an environmental health hazard of brownfield development and utilization. Most of the pollutants in the brown soil are in the state of aging, so the remediation is difficult. Brownfield remediation requires rapid method. Through the above comparison, soil stabilization treatment is the most practical method for brownfield soil remediation . Different countries have different definitions of brownfield. In the United States, brownfield refers to land that is complex because of or containing hazardous substances, contaminants, or contaminants. In the United Kingdom, brownfield focuses on land that has been used and is now unused. In Canada, brownfield is defined as abandoned, unused or unused commercial or industrial land. Although these land contains or may contain pollutants, it has great potential development value. From the nature of land use, brownfield land is mostly industrial land, it can be abandoned or can be old industrial areas which are still being used, an

Soil solidification / stabilization technology is to fix pollutants in the polluted medium and make them in a long-term stable state. It is a widely used method for rapid control and remediation of heavy metal pollution in soil. It has obvious advantages in dealing with multiple heavy metal contaminated soil simultaneously. The key to this technology is the choice of fixative and stabilizer. At present, the most widely used fixing agent is cement. The research reports include stabilizer, fly ash, lime alum slurry, ettringite, asphalt, steel slag, rice husk ash, zeolite, mostly alkaline substances, can improve the pH value of the system. Can produce hydroxide precipitation and heavy metal reaction. For example, CCT heavy metal stabilizing agents have 3 categories of chemicals, and different types of stabilizing remediation agents are selected for different heavy metal contaminated soils. Among them, CCT01 is a pervasive for heavy metal pollution in non change most of the Cu, Zn, Ni, Ag

Chemical oxidation reduction technology is by adding chemical oxidant (Fenton reagent, sodium persulfate, hydrogen peroxide, Potassium Permanganate, etc.) or reducing agent to the soil for remediation. The commonly used reducing agents are iron containing reducing agents (zero valent iron, nanoscale zero valent iron and ferrous reducing agents), reductive sulfides (H2S, FeSx, thiosulfate, etc.) and some organic compounds with reduced activity. In general, chemical oxidation technology is to add chemical oxidants to contaminated soil treatment , and rely on the oxidation capacity of chemical oxidants to decompose and destroy the structure of pollutants in the polluted environment, so that the pollutants can be degraded or converted into low toxic and low mobility substances. At present, the use of chemical reduction method to restore the sensitive organic pollutants is the focus of current research. The use of sodium persulfate chemical oxidation technology as oxidation in the soil reme

Investigation equipment: its main function is to sampling, to understand the type, concentration and distribution of pollutants in soil and underground water. It doesn’t seem very different from an ordinary drill, but in fact, due to different requirements, the difference is still great. Many pollutants are volatile, and the key to sampling is to remove soil samples from various depths for inspection purposes. Such equipment also has the capability of injecting chemicals into the ground and performing in situ remediation . This kind of equipment has already been manufactured by PARFECT . Incineration equipment: countries like the United States often burn the oil contaminated soil , so only need to deal with the exhaust, relatively simple and efficient, but the combustion equipment is expensive, the cost is not low, although it is generally not suitable for Chinese, but is very effective in some occasions. Thermal desorption equipment: similar to incineration equipment, but the temperat

1.Cement soil mixing pile Cement soil mixing pile foundation using cement as curing agent, through deep mixer in the deep soft foundation, forced mixing of soft soil and curing agent (slurry or powder) in situ, a series of physical and chemical reactions by curing agent and soft soil, the condensation with integrity, good water stability and high the strength of cement and solid, forming composite foundation with natural foundation. 2.Rock foundation reinforcement Less cracks, fresh and hard rock, high strength and low permeability, can generally be treated as a natural foundation. However, special measures should be taken to strengthen the rocks, such as weathered rock, soft rock, joint fracture and so on. Methods of batholith reinforcement such as excavation replacement, set fault concrete plug, anchoring and grouting etc.. 3.Excavation replacement For similar subgrade reinforcement method, excavation all the weathered rock above the design requirements of buildings built, replaced b

The sludge itself contains most of the ash and a part of volatile components, and a small part of the fixed carbon. Therefore, when the moisture content of sludge is less than 60%, the heat value of the drying base can reach 833kcal/kg self-sustaining combustion. When the moisture content drops to 20%, the calorific value is 2283kcal/kg, which can be used as an alternative fuel for combustion. However, the moisture content of sludge after dewatering usually exceeds 80%, which can not be burned. The sludge produced by the sewage treatment plant is about 80% of the moisture content after dewatering, which can cause harm: 1.Sludge landfill will occupy a large amount of land, aggravating the contradiction. 2.The content of bacterial pathogens in sludge is high, and contains a certain amount of copper, zinc, chromium, lead, mercury, cadmium and other heavy metals, if not effectively deal with the direct application or disposal, may increase the risk of pollution of agriculture, forestry