5results about How to "Clear water" patented technology

This invention discloses a copper ion scavenging agent suitable for a wide pH range, its preparation method, and its application. The scavenging agent comprises the following components by mass: 10-30 parts trithiocarbonate, 5-20 parts N,N-dimethylaminodithiocarbamate, and 1-5 parts sodium citrate. The preparation method is as follows: (1) Add water to a sodium citrate solution and stir to prepare a buffer solution A; (2) Add trithiocarbonate and N,N-dimethylaminodithiocarbamate to buffer solution A, stir until completely dissolved, and filter to obtain the final product. This invention has the advantages of a wider pH range, copper removal effect that varies with water quality, stable copper removal effect, fast reaction speed, and rapid floc settling. After treatment, the concentration of each copper ion is less than 0.1 mg / L, the iron content is less than 0.0001%, and the lead content is less than 0.0001%, meeting the environmental emission requirements.

This invention discloses a polyaluminum chloride-based composite flocculant and its preparation method, belonging to the field of water treatment agent technology. The preparation method includes: acid activation of natural attapulgite to obtain acid-modified nano-attapulgite crystal nuclei; hydrolysis of liquid polyaluminum chloride, basic zirconium chloride, and ferric chloride to form clusters, followed by the addition of polyepoxysuccinic acid of a specific molecular weight for dynamic shielding to obtain a shielding liquid; dispersing the crystal nuclei into the shielding liquid; and slowly adding carboxymethyl chitosan solution and anionic polyacrylamide solution sequentially at a specific rotation speed to obtain the liquid composite flocculant. This invention overcomes the problem of easy gelation of high-concentration liquid flocculants by strictly controlling the dosing sequence and the dynamic spatial shielding of polyepoxysuccinic acid; by utilizing the synergistic effect of zirconium-aluminum bimetallic flocculant and the specific chelation of carboxymethyl chitosan, excellent low-temperature and low-turbidity water removal rate is achieved while strictly controlling residual aluminum; combined with acid-modified heavy crystal nuclei, the sedimentation rate of flocs is significantly improved.

The application discloses a process for treating dyeing wastewater by a membrane method, and comprises the following steps: pretreating the dyeing wastewater, including grating, adjusting pool, coagulation and sedimentation, and filtration, to obtain filtered wastewater; the filtered wastewater enters a security filter to be subjected to secondary filtration, to obtain secondary filtered wastewater; the secondary filtered wastewater enters an NXF membrane system, and the wastewater is divided into two streams, one of which is a concentrated solution which does not reach a set concentration, and the other of which is a permeate; the concentrated solution which does not reach the set concentration returns to a front end inlet to be subjected to filtration in the NXF membrane system again; when the concentration reaches the set concentration, the concentrated solution enters a concentration storage tank to be subjected to other treatment; and the permeate enters subsequent treatment. The application aims at solving the technical problem of poor treatment effect of dyeing wastewater.

A small sewage treatment equipment, including the closed cylinder, the top of the cylinder is equipped with water inlet, the middle part of the cylinder is equipped with upper barrier net, lower barrier net, the upper barrier net and the lower barrier net form the filling space, and a plurality of suspended filler blocks are distributed in the filling space, the cylinder is provided with aerator, which is connected with air source and located below the lower barrier net, the cylinder is provided with sludge discharge port, water outlet, and the sludge discharge port is located below the lower barrier net, and the water outlet is located between the lower barrier net and the upper barrier net, and the water outlet is provided with water grate.The utility model discloses simple structure, convenient operation can peel off the active sludge of aging inactivation filler carrier, guarantees the treatment efficiency and stability.

The application provides a treatment method of epitaxial high-concentration arsenic-containing wastewater, comprising the following steps: adding calcium hypochlorite into the epitaxial high-concentration arsenic-containing wastewater, and stirring and aerating; then adding ferric chloride, and stirring and aerating; then using lime milk solution to adjust the pH of the system to 6.5-7, and continuing to stir and aerate; performing pressure filtration to obtain primary arsenic-containing wastewater; adding calcium chloride solution and ferric chloride solution into the primary arsenic-containing wastewater obtained by pressure filtration, using lime milk solution to adjust the pH of the system to 6.5-7, and then standing, taking supernatant to test, discharging the supernatant after reaching the standard; if the supernatant does not reach the standard, continuously adding calcium chloride solution and ferric chloride solution for cyclic treatment until the supernatant reaches the standard and is discharged. The method has the advantages of small reagent dosage, low cost, high arsenic removal rate, high stability of arsenic-containing hazardous waste and the like, and after being treated by the method, the arsenic content is lower than 0.3 mg / L, which meets the national discharge standard.