6results about How to "Reduce COD value" patented technology

This invention discloses a method for treating electroplating wastewater, relating to the field of electroplating wastewater treatment technology, comprising the following steps: Step 1: Mixing domestic sewage and electroplating wastewater under certain conditions to induce chemical reactions between their respective pollutants; Step 2: Visually observing whether the interaction of pollutants can produce flocculants; Step 3: Based on the experimental studies in Step 1 and Step 2, measuring the transmittance of the visually clear and transparent treated water using a 721 spectrophotometer; This method for treating electroplating wastewater removes organic pollutants and reduces its COD value to meet discharge standards by mixing domestic sewage and electroplating wastewater, removes harmful heavy metal ions to meet discharge standards, and further reduces the treatment cost of the mixed wastewater.

The invention discloses a method for treating sewage generated by a cage rough washing process, and belongs to the technical field of industrial sewage treatment. Sewage generated in a cage rough washing process is subjected to first-time filter pressing after being treated by polyacrylamide and polyaluminum chloride, then a flocculating agent and water are mixed and put into a liquid medicine cylinder, the agent and the sewage in the liquid medicine cylinder are synchronously conveyed into a stirring cylinder for first-time stirring, then an oil removing agent is added, and second-time stirring is continued; and carrying out secondary filter pressing on the treated water, feeding the water into a precipitation cylinder, finally adding an oxidizing agent, and standing to obtain the treated water. According to the method, by adding polyacrylamide, polyaluminum chloride, a flocculating agent and a deoiling agent, metal ions, oily components and other impurities in sewage generated in the rough washing process are rapidly removed, the impurity content and the COD value in the sewage are reduced, the treated water can be applied to the rough washing process again, and the utilization rate of water resources is increased.

The invention relates to the technical field of wastewater treatment, and discloses an indolocarbazole production equipment cleaning wastewater treatment and re-discharge system and technology.The indolocarbazole production equipment cleaning wastewater treatment and re-discharge system comprises a treatment outer cylinder, a feeding bin is arranged at the top of the treatment outer cylinder, and a treatment inner cylinder is arranged on the inner side of the treatment outer cylinder; filter screen holes are formed in the treatment inner cylinder, an end cover is arranged at the end part of the treatment inner cylinder, and a discharge port is formed in the treatment outer cylinder. According to the equipment cleaning wastewater treatment and re-discharge system for indolocarbazole production, accurate injection of a medicament is realized through the flocculant adding assembly, and fine particles are quickly condensed into large flocs in combination with high-strength disturbance of the stirring assembly and the swinging assembly. And in the filtering stage, the unit time treatment capacity is obviously improved. And meanwhile, through linkage cleaning of the pushing assembly and the rotating assembly, it is ensured that the filter screen is always kept in an efficient and transparent state, shutdown cleaning caused by blockage of a traditional system is avoided, and the continuous operation stability is improved.

The invention discloses a method for treating sewage and cleaning fluid sewage generated in a holder grinding process, and belongs to the technical field of sewage treatment. The treatment method comprises the following steps: adding a magnetic rod and a pretreatment agent into sewage generated in a grinding process and cleaning fluid sewage for treatment, carrying out primary filter pressing, conveying the sewage into a sewage cylinder, mixing the sewage treatment agent with water, filling a liquid medicine cylinder, synchronously conveying the liquid medicine cylinder into a stirring cylinder for primary stirring, and carrying out secondary filter pressing on the liquid medicine cylinder; and adding an oxidizing agent, stirring for the second time, carrying out secondary filter pressing, conveying into a precipitation cylinder, and standing to obtain the treated water. According to the method, sewage generated by grinding and processing and sewage generated in the subsequent cleaning process are subjected to combined treatment, pretreatment is performed through a pretreatment agent and a magnetic rod, then a sewage treatment agent and an oxidizing agent are added to synergistically degrade and remove organic pollutants in the sewage, and the COD value in the sewage is reduced.

The application discloses a method for reducing flocculants in gold smelting liquid, and belongs to the technical field of water treatment and ore dressing and smelting. In the first step, the pH of the gold smelting liquid is adjusted to 5.5-8.5; in the second step, modified activated carbon is added into the gold smelting liquid at a dosage of 0.4-0.6 g / L, the temperature of the gold smelting liquid is adjusted to 35-45 DEG C, and adsorption is carried out for 4-6 h under stirring. The application solves the problem of flocculant enrichment in ore dressing and smelting water, realizes efficient removal of flocculants in ore dressing and smelting water, has good economic efficiency and environmental protection, and meets the actual application requirements of industry. The application provides a new technical scheme for removing flocculants in ore dressing and smelting water, is suitable for water treatment processes in gold ore dressing and smelting industries, and has a wide industrial application prospect.

The application discloses a cutinase-amylase synergistic desizing process for sizing polyester fabric with starch and WPET mixed sizing material, and aims at the shortage of the traditional high-temperature strong-alkali desizing process, so that the sized polyester fabric is placed in the same desizing working solution, the synergistic effect of the cutinase and the amylase is utilized under the near-neutral and medium-temperature conditions, and the synchronous and efficient removal of the starch and the WPET mixed sizing material is completed in one step. The method has a simple process flow, can effectively remove the mixed sizing material, can significantly reduce the damage to the polyester fiber, can improve the fabric hand feeling, and has the outstanding environmental protection advantages of low energy consumption and small wastewater pollution load.