Water reclamation-algae production
阅读：561发布：2021-09-08
专利汇可以提供Water reclamation-algae production专利检索，专利查询，专利分析的服务。并且Wastewater is treated in a manner which greatly reduces the level of organic waste matter, phosphates, fixed nitrogen, bacteria, virus and suspended solids. Water is reclaimed and an algae by-product is recovered by employing a series of three ponds with different depths and detention periods, each of which performs specific functions. A dissolved-air-lime flotation step is then used to separate suspended materials (primarily algae). After the flotation step the water is held at a high pH to achieve total disinfection prior to recarbonation to stabilize the water. The by-product algae material is refined by centrifugal classification of calcium carbonate from the slurry or, optionally, by alkaline hydrolysis of protein from the algae followed by acid precipitation to yield a high quality protein concentrate.，下面是Water reclamation-algae production专利的具体信息内容。
2. A multiple pond organic waste treatment system according to claim 1 wherein the facultative pond has inlet means for receiving magnesium values from the dewatering means.
3. A multiple pond organic waste treatment system according to claim 1 wherein the facultative pond has inlet means connected to decarbonation pond outlet means for recirculating effluent from the decarbonation pond to the facultative pond.
4. A multiple pond organic waste treatment system according to claim 1 wherein recycling means conNects the underflow outlet means to the inlet means for the flotation means, and the recycling means is provided with means for introducing pressurized gas thereinto.
5. A multiple pond organic waste treatment system according to claim 1 which further comprises: g. caustic holding basin means for hydrolyzing bacterial and viral cells and having inlet means and outlet means, the inlet means being connected to said underflow outlet means of the floation means; h. stabilization basin means having at least one inlet means and plural outlet means, one inlet means being connected to the outlet means of the caustic holding basin means and one outlet means being means for removing calcium carbonate precipitate therefrom; i. recalciner means for converting calcium carbonate from the stabilization basin means and from the separating means into lime and carbon dioxide; j. means for conducting lime from the recalciner means into the flotation means; and k. means for conducting carbon dioxide from the recalciner means into the stabilization basin means.
6. A multiple pond organic waste treatment system according to claim 1 wherein the separating means is classifying centrifuge means of the solid bowl type and wherein the dewatering means is centrifuge means of the basket tpe.
7. A multiple pond organic waste treatment system according to claim 1 having a dryer means and means to convey dewatered solids from the dewatering means to the dryer means.
8. In a method for producing algae from organic waste, the improvement wherein a) raw organic waste is passed sequentially through a first pond having a depth of at least three feet, a second pond having a depth of about one foot and a third pond having a depth up to six inches, b) waste is maintained in the first pond for a period sufficient to reduce the chemical oxygen demand thereof at least 40 percent and to a level of at most 600 milligrams per liter, c) effluent from the first pond is maintained in the second pond for a period sufficient to reduce the biological oxygen demand thereof at least 75 percent, d) effluent from the second pond is maintained in the third pond for a period of from 3 to 5 hours, e) magnesium in effluent from the third pond is flocculated by adjusting the pH of that effluent to about 11.4 and f) thus-treated effluent from the third pond is subjected to flotation.
9. A process according to claim 8 which comprises maintaining underflow water from the flotation in a separate vessel for at least one hour to obtain water which is effectively sterilized.
10. A process according to claim 8 which comprises removing calcium carbonate from froth obained during flotation, carbonating the resulting froth to solubilize magnesium values therein and effecting a solid/liquid separation of the thus-carbonated material, the obtained liquid containing magnesium values and the obtained solids comprising crude algae cake.
11. A process according to claim 8 which comprises carbonating froth obtained from flotation to a pH of from 9.5 to 10.5, maintaining the thus-carbonated froth within that pH range for from 10 to 15 hours, and removing dissolved magnesium values and then calcium carbonate from the resultant.
12. A process according to claim 8 which comprises increasing the pH of froth obtained from flotation to a pH of from 11.5 to 14.0, maintaining the thus-treated froth at that pH for a period sufficient to solubilize protein therein, separating calcium carbonate from the resultant, acidifying the remainder to precipitate protein therein and separating an algal protein cake.
13. A process according to claim 8 for producing algae and usable water which comprises: a. maintaining underflow water from the flotation essentially quiescent for a period sufficient to obtain effectively sterilized water; b. removing calcium carbonate from froth from the flotation to obtain a product which contains algae aNd magnesium values; c. carbonating the product to solubilize the magnesium values therein; and d. separating the water solubles from the water insolubles, the solubles containing the magnesium values and the insolubles comprising crude algae.
14. A process according to claim 1 which comprises recycling the solubles containing magnesium values to the first pond.
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