36results about How to "Solve the problem of meeting emission standards" patented technology

The invention relates to the field of industrial waste water treatment, particularly relates to and discloses a method for concentrating CMP (chemi-mechanical pulp) waste liquid by using a membrane process. The method comprises the following steps: (1) heat exchange for cooling; (2) microfiltration treatment; (3) ultrafiltration pretreatment; and (4) membrane preconcentration. In the CMP waste liquid treatment method provided by the invention, the CMP waste liquid with initial concentration by mass percentage of 1-2% is concentrated to 7-10% by a membrane concentration system, and penetrationliquid can be directly discharged or reused. Through adopting an immersed ultrafiltration and reverse-osmosis / nanofiltration preconcentration process and a series of membrane pollution control techniques, the smoothly continuous operation of the system can be ensured, thereby realizing the zero discharge of the CMP waste liquid. By using the method provided by the invention, the problem that the CMP waste liquid is treated to meet the States discharge standards can be completely solved; and compared with a direct evaporation and concentration mode, the method is characterized by adopting preconcentration of the membrane system, the energy consumption is greatly reduced, and a good deal of produced water can be recycled, therefore, the method provided by the invention has good economic andsocial benefits.

A process for treating the waste emulsion with the used acid generated by pickling includes such steps as adding the said used acid to the waste emulsion which stirring, laying aside for 18-36 hr, separating upper oil layer from water, adding calcium carbonate to the water, laying aside for 2-12 hr, regulate adding lime water to pH to 7-9, laying aside for 18-36 hr, and draining off the upper water layer. Its advantages are low cost and using the recovered oil as fuel of boiler.

The present invention provides a combined biological bed treatment process for waste water with low carbon source, high ammonia nitrogen and high organic phosphorus, including five steps of raw water adjustment, iron-carbon-Nefton treatment, struvite treatment, A2O treatment, and Fenton advanced treatment. The first flocculant and the second flocculant are respectively added in the iron-carbon-Nefton treatment step and the Fenton advanced treatment step; the present invention adopts the low-carbon source high ammonia nitrogen high organic phosphorus wastewater combined biological bed treatment process as the low-carbon source high The main treatment method of ammonia nitrogen and high phosphorus wastewater greatly improves the efficiency of biochemical treatment, solves the problem of low-carbon source high ammonia nitrogen and high organic phosphorus wastewater discharge standards, and has good social and economic benefits; Nefenton, iron-carbon micro-electrolysis The combination with Fenton can improve the Fenton effect, reduce operating costs and operating workload.

The invention discloses a circulating fluidized bed boiler oxygen-enriched combustion dry desulphurization system and method. The dry desulphurization system comprises a hearth, a coal feeding hole, a primary air chamber, an air distribution device, a high-temperature cyclone separator, a tail flue, a coal economizer and a return device, wherein a desulfurizer feeding hole is formed in the coal feeding hole or / and in a return leg of the return device; a medium-temperature cyclone separator is arranged on the tail flue on the rear of the coal economizer; a return bin of the medium-temperature cyclone separator is connected with the hearth through a pipeline; a central drum of the medium-temperature cyclone separator is connected with the primary air chamber through an air hose and a primary air hose and is connected with the hearth through the air hose and a secondary air hose; an induced draft fan is arranged on the air hose; an oxygen injection device is arranged on at least one of the air hose, the primary air hose and the second air hose. The circulating fluidized bed boiler oxygen-enriched combustion dry desulphurization system can effectively solve the SOx up-to-standard discharge problem of a boiler, increase the utilization ratio of limestone, reduce consumption of limestone, improve desulphurization efficiency, realize efficient and economical desulphurization in the boiler as well as CO2 enrichment, facilitate compression, purification, utilization, sealing and storage of CO2, and meet environmental protection demand.

The invention relates to a catalytic wet oxidation pretreatment method of glyphosate production wastewater, comprises the following steps: firstly regulating pH value to be more than 8 and less than 10, adding a multi-component homogeneous catalyst and carrying out oxidative degradation on pollutants in wastewater for 0.3-2 hours by using a continuous catalytic wet oxidation device with air as an oxidizing agent at the reaction temperature of 210-230 DEG.C and the reaction pressure of 2-4MPa, wherein the catalyst is a soluble transition metal salt mixture. By adopting the method for treating the glyphosate production wastewater, the organic phosphorus conversion rate is high, the COD (chemical oxygen demand) removal rate is high, the biodegradability of the wastewater can be improved, and the secondary pollution is avoided. The method has the advantages that the catalyst activity is high, low in cost and easy to get, reaction conditions are relatively mild, and continuous operation is easily implemented; the glyphosate production wastewater can be discharged in standard through the combined process of catalytic wet oxidation pretreatment-routine technical dephosphorization and deamination-biochemistry, and the industrialized application prospect is great.